The mass of copper in the compound is 4.765 g because the complex's mass was 12.259 g.
The equation for the decomposition of the copper oxide compound is:
[tex]CuO \rightarrow Cu + O_2[/tex]
Given that 2.410 g of oxygen was produced, we can calculate the amount of copper present in the compound.
We know that 1 mole of oxygen has a mass of 32 g. So the mass of 2.410 g of oxygen is equal to ([tex]\frac{2.410 g }{ 32 g/mol}[/tex]) = 0.075 moles of oxygen.
Since the reaction is a 1:1 ratio, the same amount of moles of copper must have been present in the compound.
The mass of copper in the compound is equal to (0.075 moles x 63.546 g/mol) = 4.765 g.
Since the mass of the compound was 12.259 g, the mass of copper in the compound is 4.765 g.
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Single Replacement Reactions
Calcium + Lead (II) nitrate →
Answer:
Ca(NO3) + Pb
Explanation:
that,s the proper equation
1.What is the formula for tritellurium dichlorodie?
2.What is the formula for diselenium hexasulfid ?
Answer:
Explanation: Te3Cl2
Se2 S6
Just make the number small like subscripts
Can someone please help with this chemistry question
Molar mass of carbon dioxide is 44.01 g/mol. Thus, 9.2 moles of carbon dioxide will have a mass of 408.19 g.
What is carbon dioxide?Carbon dioxide (CO2) is a colorless, odorless gas that is naturally found in the Earth's atmosphere. It is one of the most important greenhouse gases and is the primary driver of global warming. Carbon dioxide is produced naturally by the respiration of living organisms, such as humans and animals, and by the decomposition of organic matter. It is also produced by burning fossil fuels and other industrial processes. Carbon dioxide is used in photosynthesis by plants, which convert it into oxygen and carbohydrates, providing the oxygen humans and animals need to breathe.
Molar mass of methane is 16.04 g/mol. Therefore, 408.19 g of carbon dioxide is equivalent to 25.5 moles of methane. This means that 25.5 moles of methane will have a mass of 408.19 g. Therefore, the answer is 408 g.
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Which of the following organisms typically have more than one form of east of each gene from can mask the appearance another form that form is considered _____ the other form
Which of the following organisms typically have more than one form of east of each gene from can mask the appearance another form that form is considered dominant the other form,
Are both of an organism's alleles identical when it possesses homozygosity for a given gene?Each gene in each of us has two alleles, or variations. If you inherit two identical copies of a gene, you are said to be homozygous for that gene. In contrast, a genotype with distinct alleles is called a heterozygous genotype. Individuals with recessive characteristics, such as red hair or blue eyes, are always homozygous for that gene.
if a trait has two equally expressed alleles and none can prevent the expression of the other allele This is an illustration of codominance, a genetic phenomena in which the expression of two alleles (differing variants of the same gene) within an organism is equal. The features linked to each allele are therefore displayed concurrently.
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To earn full credit for your answers, you must show the appropriate formula, the correct substitutions , and your answer including the correct units
Star City has 4.2 x 106 people has 1.9 x103 deaths. What is the death rate?
The death rate in Star City is 0.452 deaths per 1000 people.
What is the death rate?
The death rate is the number of deaths per unit of population. It is calculated by dividing the number of deaths by the total population and multiplying the result by 1000 to express it per 1000 people.
The formula for death rate is:
Death rate = (Number of deaths / Total population) x 1000
Substituting the given values:
Death rate = (1.9 x 10³ / 4.2 x 10⁶) x 1000
Simplifying the expression:
Death rate = 0.000452 x 1000
Death rate = 0.452 deaths per 1000 people
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Please help me fast
Calculate the molar mass of the following substances
a) To convert 1.65 moles of magnesium chloride to grams, we need to first determine the molar mass of MgCl.
The molar mass of MgCl is the sum of the atomic masses of magnesium and chlorine:
Mg: 24.31 g/mol
Cl: 35.45 g/mol
Molar mass of MgCl = 24.31 g/mol + 35.45 g/mol = 59.76 g/mol
Now, we can use the molar mass to convert 1.65 moles to grams:
1.65 moles x 59.76 g/mol = 98.70 grams
Therefore, 1.65 moles of MgCl is equal to 98.70 grams.
b) To convert grams of Na2CO3 to moles, we need to first determine the molar mass of Na2CO3.
The molar mass of Na2CO3 is the sum of the atomic masses of sodium, carbon, and oxygen, taking into account the two sodium atoms in each molecule:
Na: 22.99 g/mol
C: 12.01 g/mol
O: 16.00 g/mol
Molar mass of Na2CO3 = (2 x 22.99 g/mol) + 12.01 g/mol + (3 x 16.00 g/mol) = 105.99 g/mol
Now, we can use the molar mass to convert grams to moles:
1 grain = 0.06479891 grams
10 grains = 0.6479891 grams
0.6479891 g / 105.99 g/mol = 0.0061 moles
Therefore, 10 grains (0.6479891 grams) of Na2CO3 is equal to 0.0061 moles.
What is molar mass example?The molar mass (M) of a chemical product is described in chemistry as the ratio of mass to substance (measured in moles) of any sample of said molecule. The molar mass of a material is a bulk characteristic, not a molecular trait. The molar mass is an average of many occurrences of the compound, which often differ in mass due to isotopes present.
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The mοlar mass οf MgCl₂ is 95.21 g/mοl.
It is calculated by summing the atοmic masses οf all the atοms in a mοlecule οr fοrmula unit οf a substance. Mοlar mass is an impοrtant cοncept in chemistry because it allοws us tο relate the mass οf a substance tο the number οf particles (atοms, mοlecules, οr iοns) in it.
The mοlar mass οf MgCl₂ (Magnesium chlοride) can be calculated by adding the atοmic masses οf magnesium (Mg) and chlοrine (Cl) atοms in the cοmpοund.
The atοmic mass οf magnesium (Mg) is 24.31 g/mοl, and the atοmic mass οf chlοrine (Cl) is 35.45 g/mοl (apprοx). MgCl₂ has οne magnesium atοm and twο chlοrine atοms, sο its mοlar mass can be calculated as:
Mοlar mass οf MgCl₂ = (1 x 24.31 g/mοl) + (2 x 35.45 g/mοl)
= 24.31 g/mοl + 70.90 g/mοl
= 95.21 g/mοl
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100 POINTS PLS HELP
Which of the following are part of the equation to calculate the percent yield? Select all that apply.
A actual yield
B limiting reactant
C theoretical yield
D excess reactant
Answer:
Actual yield and theoretical yield
grams of Fe₂O3:
g Fe₂0;
71.86 grams of Fe2O3 can form from 21.6 grams of O2.
How to solveTo determine the amount of Fe2O3 that can form from 21.6 g of O2, we need to use the balanced chemical equation and the stoichiometry of the reaction.
According to the balanced chemical equation:
4 Fe(s) + 3 O2(g) → 2 Fe2O3(s)
The stoichiometric ratio of O2 to Fe2O3 is 3:2. This means that for every 3 moles of O2, 2 moles of Fe2O3 are produced.
To calculate the amount of Fe2O3 formed, we need to first convert the mass of O2 given to moles:
n(O2) = m(O2) / M(O2)
where:
m(O2) is the mass of O2 given in the problem, which is 21.6 gM(O2) is the molar mass of O2, which is 32.00 g/moln(O2) = 21.6 g / 32.00 g/mol = 0.675 mol O2Next, we can use the stoichiometric ratio to calculate the number of moles of Fe2O3 formed:
n(Fe2O3) = 2/3 x n(O2)
n(Fe2O3) = 2/3 x 0.675 mol = 0.450 mol
Finally, we can convert the number of moles of Fe2O3 to grams using its molar mass:
m(Fe2O3) = n(Fe2O3) x M(Fe2O3)
where:
M(Fe2O3) is the molar mass of Fe2O3, which is 159.69 g/molm(Fe2O3) = 0.450 mol x 159.69 g/mol = 71.86 gTherefore, 71.86 grams of Fe2O3 can form from 21.6 grams of O2.
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How many grams of [tex]Fe_2O3[/tex] can form from 21.6g of [tex]O_2[/tex]
[tex]4Fe(s) + 3O_2(g) -------- > 2Fe_2O_3(s)[/tex]
1) All of the following are homogeneous mixtures except.
* tomato soup.
* a sugar-water solution.
* gasoline.
* a salt-water solution.
2)If a mixture is cloudy or displays the Tyndall effect, then it is either a
* colloid or a suspension
* colloid or a solution
* suspension or a solution
* element or compound.
Answer:
1. Gasoline is not a homogeneous mixture; it is a complex mixture of different hydrocarbons and additives.
2. If a mixture is cloudy or displays the Tyndall effect, then it is either a colloid or a suspension.
Calculate the number of vanadium atoms in a 50.0 sample of vanadium oxide (V2O5)
Two solutions are mixed and react t produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.
AgNO2 + Na Cl ----> AgCl + Na NO2
What happens to the total mass as the reaction takes place?
Two solutions are mixed and react t produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.
AgNO2 + Na Cl ----> AgCl + Na NO2
What happens to the total mass as the reaction takes place?
A.The mass decreases.
B.The mass first decreases and then increases.
C.The mass remains constant.
D.The mass increases.
Answer:
The correct answer is C. The mass remains constant.
Explanation:
The Law of Conservation of Mass states that the total mass of a closed system remains constant during a chemical reaction. This means that the mass of the reactants before the reaction is equal to the mass of the products after the reaction.
In the given chemical reaction, silver nitrate (AgNO3) reacts with sodium chloride (NaCl) to produce silver chloride (AgCl) and sodium nitrate (NaNO3). Since the reaction involves only the rearrangement of atoms and not the creation or destruction of atoms, the total mass of the reactants must be equal to the total mass of the products.
The correct answer is C. The mass remains constant.
Explain the difference between the three of levers
Depending on where a force, fulcrum, and load are, the three classes differ from one another. The centre of gravity of a first-class lever is situated here, halfway between both the input force or the output force.
Name the three lever classes and describe each.Depending upon where the power supply, fulcrum, or load are located, there are three different kinds of levers. The fulcrum of a class 1 lever is situated between both the input force or the load. The load is situated between both the fulcrum and the input force of a class 2 lever. Levers with the input force located between the fulcrum as well as the load are classified as class 3 levers.
What is third class lever known as?These are the types of levers where the weight is on one end, the fulcrum is in the middle, as well as the force is applied. The arrangement is shown as a weight-force-fulcrum. In this situation, we need to exert greater force in order to move the weight.
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How many moles of water, H2O
H
2
O
, are produced from 2. 49×10−2 mole
m
o
l
e
of butane, C4H10
C
4
H
10
?
Answer:
0.124 moles of water (2.24 grams)Explanation:
The moles of water produced by the combustion of butane requires 3 steps. The first is the primary challenge of this question:
1) Balance the Reaction
Write the reaction using just chemical formulas. We know that a combustion reaction produces carbon dioxide and water, so let's start there:
C4H10 + O2 = CO2 + H2O
This looks correct - there are no elements that are just on one side (unaccounted for). Now we need to balance the reaction. Use pencil and paper for this step. We can see that although butane consists of only two elements, carbon and oxygen, there are a lot of them. It is often a good idea to find the most complex molecule and assign it a coefficient of 1 (in pencil), just to get started.
a) 1C4H10 + O2 = CO2 + H2O
Now distribute the atoms from butane to the products by assigning them coefficients:
b) 1C4H10 + O2 = 4CO2 + H2O
The 4 carbons require that we add a coefficient of 4 to CO2, since it is the only possible destination for the carbons.
The 10 hydrogens must all go to the H2O, so add a 5 to the H2O:
c) 1C4H10 + O2 = 4CO2 + 5H2O
Now that the carbons and hydrogens are accounted for, work on the oxygens. As written in c, there are 2 O atoms from the reactants, and (8+5) = 13 O atoms from the products. This is an annoying outcome: There will always be an even number of O atoms coming from the O2. so there is no whole number we can add as the O2 coefficient that will produce an odd number of O atoms. But an easy resolution is, temporarily, use a fraction for the number of O2 molecules. If we use a coefficient of 6.5 for the O2, the equation will balance.
d) 1C4H10 + 6.5O2 = 4CO2 + 5H2O
But we can't have 1/2 of a molecule, so let's multiply all coefficents by 2, so that they are all whole numbers:
e) 2C4H10 + 13O2 = 8CO2 + 10H2O
That's why we use a pencil.
2. Determine the molar ratio of the water to the butane
The important thing to note is that the balanced equation tells us that we should expect 10 moles of H2O for every 2 moles of C4H10, a molar ratio of 5/1 moles water/mole butane. This is a conversion factor: (5 moles H2O)/(1 mole C4H10)
3. Find the moles of water produced
It took a while to get to this point, "but the end is near." We are given 2.49x10^-2 moles of butane. Simply multiply that times the molar ratio we derived above:
(2.49x10^-2 moles butane)*[(5 moles water)/(1 mole butane)] = 0.124 moles of waterA lot of work for 2.24 grams of water. I suggest finding a water fountain instead.
Can someone please help with this chemistry question
According to the question the Cameron's percent yield is 63.0%.
What is yield?Yield is the return on an investment over a specified period of time, usually expressed as a percentage. Yield is typically calculated by taking the income generated from an investment, such as dividends or interest, and dividing it by the total amount of capital invested. Yield can also refer to the rate of return on a bond or other fixed-income security, which is determined by the coupon rate, current market price, and time remaining until maturity.
Cameron's percent yield can be calculated by dividing the actual yield by the theoretical yield and multiplying by 100.
In this case, the calculation is (14.8/23.4)*100=63.2%.
Therefore, Cameron's percent yield is 63.2%. yield of 23.4 g of magnesium oxide, and then multiplying by 100.
Therefore, the equation is (14.8 g/23.4 g) x 100 = 63.0%.
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Select the answer with the correct number of significant figures for each calculation. (6.022 × 1023) × 2.58 = 1.55 × 1024 1.554 × 1024 1.5537 × 1024
The calculation is correct with "1.55 × 10^24" three significant figures.
What is the significance of significant figures in scientific calculations?Significant figures are important in scientific calculations because they indicate the precision and accuracy of a measurement or calculation. They help ensure that the final result reflects the level of precision of the original measurements.
How do you determine the number of significant figures in a calculation?The general rule for determining significant figures is that any digit that is not zero is significant, as well as any zero between significant digits. Zeros to the left of the first nonzero digit are not significant. When adding or subtracting, the result should be rounded to the same number of decimal places as the least precise measurement. When multiplying or dividing, the result should be rounded to the same number of significant figures as the measurement with the least significant figures.
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Calculate the mass of naphthalene required to react stoichiometrically with the moles of 2-bromo-2-methylpropane that you have placed in the flask. Dispense that quantity of naphthalene into the weighing dish. There is some imprecision in delivering the powder onto the weigh boat, but a mass within 0. 040 g of the calculated stoichiometric quantity will be sufficient for this experiment. Note that you can use a combination of the 1 g and the 0. 1 g buttons to add the required mass. If you overshoot the goal, you can dis
We will need 12.817 grams of naphthalene to react stoichiometrically with 0.1 moles of 2-bromo-2-methylpropane. As mentioned in the question, a mass within 0.040 g of the calculated stoichiometric quantity will be sufficient for the experiment. So, a mass of naphthalene between 12.777 g and 12.857 g will be appropriate.
2-bromo-2-methylpropane + naphthalene → product(s)
To calculate the mass of naphthalene required for the reaction, we need to know the mole ratio of 2-bromo-2-methylpropane to naphthalene in the balanced equation.
From the balanced equation, we can see that the mole ratio is 1:1.
This means that one mole of 2-bromo-2-methylpropane will react with one mole of naphthalene.
First, we need to determine the number of moles of 2-bromo-2-methylpropane that we have in the flask.
Let's assume we have 0.1 moles of 2-bromo-2-methylpropane.
To react stoichiometrically, we will need 0.1 moles of naphthalene.
The molar mass of naphthalene is 128.17 g/mol.
To calculate the mass of naphthalene required, we can use the following equation:
mass = moles x molar mass
mass = 0.1 moles x 128.17 g/mol
mass = 12.817 g
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CORRECT QUESTION WOULD BE
Calculate the mass of naphthalene required to react stoichiometrically with the moles of 2-bromo-2-methylpropane that you have placed in the flask. Dispense that quantity of naphthalene into the weighing dish. There is some imprecision in delivering the powder onto the weigh boat, but a mass within 0. 040 g of the calculated stoichiometric quantity will be sufficient for this experiment. Note that you can use a combination of the 1 g and the 0. 1 g buttons to add the required mass. If you overshoot the goal, you can displace some of the powder back into the bottle with a spatula.
what would happen to the temperature and physical state of 1 mol of liquid diethyl ether at its standard boiling point if its molar enthalpy of vaporization (26.52 kj/mol) were added?
When 1 mol of liquid diethyl ether at its standard boiling point is given an enthalpy of vaporization of 26.52 kJ/mol, the temperature of the liquid will remain the same, but the physical state of the diethyl ether will change from liquid to vapor.
The enthalpy of vaporization is the energy required to convert one mole of a liquid into a vapor and is also known as the heat of vaporization. When the enthalpy of vaporization is applied to liquid diethyl ether, it causes the liquid to become a vapor.
In order to understand this concept, it is helpful to look at the thermodynamic process of vaporization, or boiling. Vaporization involves the conversion of liquid to a gas at the standard boiling point by the absorption of energy, which is provided in the form of heat.
During vaporization, the liquid molecules move quickly and gain enough energy to escape the surface of the liquid and form a gas. This process is also reversible, so as the vaporized molecules lose energy, they can condense back into the liquid state.
Therefore, the temperature remains the same, but the liquid is converted to a vapor. This vapor can eventually condense back into liquid form, depending on the temperature and pressure of the system.
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Match
1)solutions
2)colloids
3)suspensions
smaller than 1 nm
larger than 1000 nm
1 nm to 1000 nm
Answer:
Solutions - smaller than 1 nm
Colloids - 1 nm to 1000 nm
Suspensions - larger than 1000 nm
Explain, in terms of molecular polarity, why oxygen gas has low solubility in water. (MUST INCLUDE BOTH OXYGEN AND WATER IN ANSWER.)
Answer:
O2 gas has low solubility in water because oxygen is a non-polar molecule whereas H2O (or water) is polar (due to the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule - with a bent molecular structure).
Explanation:
Oxygen gas is a diatomic molecule, meaning that is has 2 oxygen molecules that are linked using a double bond. As a result, O2 gas can only dissolve in water (or H2O) by way of a dipole-induced dipole interaction or Van Der Waals. Another reason may be that O2 gas is covalently bonded (can't form ions) whereas H2O is ionically bonded with one another.
Oxygen gas has low solubility in water according to polarity and non polarity theory.
What is solubility?Solubility is the amount of solute that can be dissolved in a solvent. Generally, the solubility of most solutes increases with an increase in the temperature of the solvent.
The property that can help sugar molecules or salt crystals to dissolve is known as solubility.
Factors that affect solubility include:
Concentration of the solute
Temperature
Pressure
Polarity of the solute and the solvent
It has been observed that like molecules dissolve in like solvent. Polar molecules can only be soluble in polar solvent. Water is a polar solvent but Oxygen molecule is linear molecule with only Oxygen atoms hence no polarity.
Therefore, Oxygen gas has low solubility in water according to polarity and non polarity theory.
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Many common things you use regularly are colloids except.......
-milk
-hair
-spray
-paint
-alloy
Many common things you use regularly are colloids except alloy.
What is an alloy?An alloy is a solid solution composed of two or more metals or a metal and a non-metal element. In contrast, colloids are mixtures where one substance is dispersed throughout another substance in the form of small particles that do not settle out.
What are colloids?Colloids are mixtures composed of particles that are intermediate in size between those of a solution and a suspension. These particles are typically between 1 and 1000 nanometers in diameter, which is too small to be seen with the eye, but large enough to scatter light, giving the mixture a cloudy or opaque appearance.
Milk, hair, spray, and paint are all examples of colloids.
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The graphic below is based on the Bohr model of an atom in the ground state.
12 n
12 p
OB. The atom is in group 1 and period 2.
OC. The atom is in group 2 and period 3.
OD. The atom is in group 2 and period 4.
282
Which most likely identifies the location of the element on the modern periodic table?
O A. The atom is in group 1 and period 1.
Answer:
Explanation:
Based on the information given in the graphic, we can determine that the atom has 12 protons and 12 neutrons, which would give it an atomic mass of 24. However, the graphic does not provide information about the number of electrons, which would be necessary to determine the element's location on the modern periodic table.
Therefore, none of the answer choices provided can be determined from the information given. We cannot identify the group or period of the element on the modern periodic table based solely on the number of protons and neutrons in the atom.
A reaction vessel contains 6. 300 g of CO and 6. 300 g of O2. How many grams of CO2 could be produced according to the following reaction?
The grams of CO2 that could have been produced according to the reaction is 21.2 grams.
We apply the stoichiometric principles to calculate the potential yield of a particular mixture of chemicals. To determine the mole to mole correlations between the chemical species in stoichiometry, we apply the balanced chemical equation. The theoretical yield is the highest yield that can be estimated from the starting reagent quantities. The amount collected is known as the actual yield, and frequently we discover that the theoretical yield is not achieved.
The balanced chemical equation is:
2CO + O₂ → 2CO₂
Molar Mass CO = 28.0 grams per mole
Molar Mass O2 = 32.0 grams per mole
Molar Mass CO2 = 44.0 grams per mole
We determine the maximum quantity of carbon dioxide that may be produced from each reagent based on their initial concentrations. This assumes that there is an excess of the other reagent.
13.5 g CO x 1 mol CO / 28 g CO x 2 mol CO₂ / 2 mol CO x 44 g CO₂
= 21.2 g CO₂
Therefore, grams of CO2 could be produced is 21.2 g.
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Complete question:
A reaction vessel contains 6. 300 g of CO and 6. 300 g of O2. How many grams of CO2 could be produced according to the following reaction?
2CO + O₂ ----> 2CO₂
please answer these two questions quickly, i wasn’t here when we learnt this.
Each atom on both sides of a balanced chemical equation has the same number and type. A balanced equation's coefficients must have the simplest whole number ratio. In chemical processes, mass is always preserved.
What is an example of a balanced chemical equation?Consider the following reaction: 2Mg(s)+O2(g)2MgO(g), Two atoms of magnesium and oxygen are present on both the reactant and product sides of this reaction. As a result of obeying the rule of conservation of mass, the chemical reaction is a balanced chemical equation.
A balanced chemical equation is one in which the number of each type of atom on both sides of the equation is equal. Subscripts are elements in the chemical formulae of reactants and products that denote the number of atoms of the previous element.
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Identify the layer labeled, 2, and explain the impact if this layer was removed from the sun.
Responses:
Core; the sun will not produce light and heat if removed due to no nuclear fusion.
StartFragment, StartFragment, Core; the sun will not produce light and heat if removed due to no nuclear fusion., ,
Radiation zone; energy will not be carried into the convection currents and thus no light and heat will reach Earth.
StartFragment, Radiation zone; energy will not be carried into the convection currents and thus no light and heat will reach Earth.,
Radiation zone; the sun will not produce light and heat if removed due to no nuclear fusion.
StartFragment, Radiation zone; the sun will not produce light and heat if removed due to no nuclear fusion.,
Core; energy will not be carried into the convection currents and thus no light and heat will reach Earth.
The crust, mantle, and core of the earth are its three layers. Both the heat and the light from the Sun come from the a nuclear fusion inside the Sun's core. Proton fusion is the part of fusion takes place inside Sun.
What are the Sun's three atmospheric layers?These are, starting from the outside: the heated, outermost layer of the atmosphere is called the corona. between the photosphere and the corona is a transparent layer known as the chromosphere. This visible "surface" of a Sun is called the photosphere.
What are the layers of the Sun, and what purpose do they fulfil?The 3 major layers that make the environment are the convective zone, the radiative zone, and the core. They make up the Sun's interior. The region of the Sun that is closest to it's own centre is called the core, which is where that hydrogen fuses with helium to form helium.
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The molecular formula for glucose is c6h12o6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?
This polysaccharide has the molecular formula C₆₀H₁₀₂O.
When ten glucose molecules are linked together by dehydration reactions, a polymer is formed called a polysaccharide. The molecular formula of this polysaccharide can be derived by adding the molecular formula of ten glucose molecules and subtracting the number of water molecules released during the polymerization process.
The molecular formula of one glucose molecule is C₆H₁₂O₆. When ten glucose molecules are linked together, ten water molecules are released, one for each bond formed. Therefore, the molecular formula for the polymer made by linking ten glucose molecules together by dehydration reactions would be:
(C₆H₁₂O₆)10 - (H₂O)10 = C₆₀H₁₀₂O₅₁
So the molecular formula for this polysaccharide is C₆₀H₁₀₂O₅₁. This type of polysaccharide is commonly found in nature, including starch in plants and glycogen in animals.
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A microbiologist is preparing a medium on which to culture E. Coli bacteria. She buffers the medium at pH 7. 00 to minimize the effect of acid-producing fermentation. What volumes of equimolar aqueous solutions of K2HPO4 and KH2PO4 must she combine to make 250. 0 mL of the pH 7. 00 buffer?
The volumes 447.0 mL and 353.0 mL of equimolar aqueous solutions of K2HPO4 and KH2PO4 must she combine to make 250. 0 mL of the pH 7. 00 buffer solution.
A buffer solution is defined as a solution when an acid or a base is in equilibrium with its conjugate base or acid and because of that, when other acid or base is added to the solution, the pH remains almost unaltered. It is a water solvent based solution which consists of a mixture containing a weak acid and the conjugate base of the weak acid or a weak base and the conjugate acid of the weak base. Buffer resist a change in pH upon dilution or upon the addition of small amounts of acid or alkali to them.
The pH of a buffer can be calculated by the expression of Henderson–Hassel Balch equation,
pH = pKa + log[A-]/[HA]
Here, pKa is the equilibrium constant of the acid and A- is the conjugate base and [HA] is the acid.
(n1/V1)/(n2/V2) = 0.79
(n1/V1)*(V2/n2) = 0.79
Because n1 = n2,
V2/V1 = 0.79
V2 = 0.79V1
The total volume must be 800.0 mL, so
V1 + V2 = 800.0
V1 + 0.79V1 = 800.0
1.79V1 = 800.0
V1 = 447.0 mL
V2 = 353.0 mL
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The reaction between copper oxide and carbon can be used to make copper metal.
The equation for this reaction is:
2CuO(s) + C(s) → 2Cu(s) + CO2(g)
A mixture of 4.0 g of CuO and 1.2 g of carbon is heated.
Calculate the number of moles in 4.0 g of CuO
Answer:
The molar mass of CuO is 63.55 g/mol for copper and 15.9994 g/mol for oxygen, giving a total molar mass of 79.55 g/mol.
To calculate the number of moles in 4.0 g of CuO, we can use the formula:
moles = mass / molar mass
moles of CuO = 4.0 g / 79.55 g/mol
moles of CuO = 0.0502 mol
Therefore, there are 0.0502 moles in 4.0 g of CuO.
P_{4}(s) + F_{2}(g) > P*F_{3}(g) calculate the moles of that will be required to produce 27. 5 grams of PF3
Answer:
Explanation:
moles of what?
if P4= 0.078 moles P4
if F2=0.47 MOLES F2
if there are 7 moles of H2 and 8 moles of O2 how many water molecules can you make
Answer:
Explanation:
The balanced chemical equation for the reaction of hydrogen gas (H2) with oxygen gas (O2) to form water (H2O) is:
2H2 + O2 → 2H2O
According to the equation, 2 moles of H2 react with 1 mole of O2 to produce 2 moles of H2O. Therefore, to determine how many water molecules can be made from 7 moles of H2 and 8 moles of O2, we need to determine which reactant is limiting and calculate the amount of product that can be formed based on the limiting reactant.
To do this, we can calculate the moles of H2O that can be produced from each reactant and choose the smaller value as the limiting reactant.
From 7 moles of H2, we can produce:
(7 moles H2) x (2 moles H2O / 2 moles H2) = 7 moles H2O
From 8 moles of O2, we can produce:
(8 moles O2) x (2 moles H2O / 1 mole O2) = 16 moles H2O
Since we can only produce 7 moles of H2O from the H2, but we can produce 16 moles of H2O from the O2, the H2 is the limiting reactant. Therefore, the maximum amount of water molecules that can be produced is:
(7 moles H2) x (2 moles H2O / 2 moles H2) = 7 moles H2O
Finally, we can convert moles of H2O to the number of water molecules by multiplying the moles by Avogadro's number:
(7 moles H2O) x (6.02 x 10^23 molecules/mole) = 4.22 x 10^24 molecules of H2O
Therefore, from 7 moles of H2 and 8 moles of O2, we can make 4.22 x 10^24 water molecules.
in the decomposition of hydrogen peroxide, you follow the reaction by studying the production of oxygen gas in a wash bottle, which displaces water out of the bottle. where should you measure the temperature to characterize the gas? select one: about two inches above the bottle above the liquid level in the bottle in the displaced water in the test tube in the liquid in the bottle
In the decomposition of hydrogen peroxide, you follow the reaction by studying the production of oxygen gas in a wash bottle, which displaces water out of the bottle. The location where you should measure the temperature to characterize the gas is about two inches above the bottle.
The decomposition of hydrogen peroxide is the process of breaking down hydrogen peroxide into water and oxygen. This reaction occurs spontaneously in the presence of light or in the presence of a catalyst. Hydrogen peroxide is a strong oxidizing agent that is widely used in industry and medicine.
You should measure the temperature of the gas about two inches above the bottle to characterize the gas. Since the production of oxygen gas takes place in the wash bottle and displaces water out of the bottle, the displaced water is not a good location to measure the temperature. Similarly, the temperature of the gas cannot be measured inside the test tube or in the liquid in the bottle. To obtain an accurate measurement of the temperature of the gas produced in the reaction, you should measure the temperature of the gas about two inches above the bottle. This is because the temperature of the gas will be closest to the actual temperature of the gas in this location.
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