Moles of lead nitrate used mol Product mass Molar mass Pb 207 g/mol Molar mass N 14 g/mol Molar mass o 16 g/mol = 56 .65 %
moles of Pb([tex]NO_{3}[/tex]) = 14.8 / 331 = 0.0447
∵ moles = mass / molar mass
[tex]Pb(NO_{3}) + 2Cl = pbcl_{2} + 2NO_{3}[/tex]
[tex]\frac{moles of Pb (NO_{3}) }{1} = \frac{moles of Pbcl_{2} }{1}[/tex]
moles of [tex]Pbcl_{2}[/tex] = 0.0447
Theoretical mass of [tex]Pbcl_{2}[/tex] = moles * molar mass
= 0.0447 * 278
= 12.4266
% yield = Actual mass of [tex]Pbcl_{2}[/tex] / Theoretical mass of [tex]Pbcl_{2}[/tex] * 100
= [tex]\frac{7.04}{12.4266} * 100[/tex]
= 56 .65 %
Lead(II) chloride (PbCl2) is an inorganic compound that is white strong under surrounding conditions. It is ineffectively solvent in water. Lead(II) chloride is one of the main lead-based reagents. It likewise happens normally as the mineral cotunnite.
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the complete question is:
Begin Scenario An experiment was carried out to make lead chloride from lead nitrate. 7.04 g of lead chloride was obtained from 14.8 g of lead nitrate. Determine the percentage yield of lead chloride. Reactant mass 14.8 g 7.04 g a Determine the moles of lead nitrate, PbNO3, used in the experiment (To avoid introducing rounding errors on intermediate calculations, enter your answer to four significant figures.) Moles of lead nitrate used mol Product mass Molar mass Pb 207 g/mol Molar mass N 14 g/mol Molar mass o 16 g/mol
only 2.6% of all water on earth is ___
I NEED HELPPP
Answer:
I think...
Locked away in glaciers and ice caps.
A sample of compound A was heated in a Bunsen flame and no flame colour. On addition of sodium
hydroxide solution to a solution of A, a white precipitate formed that did not re-dissolve when more sodium
hydroxide was added. When nitric acid was added to a solution of A, the mixture bubbled giving a gas that
turned limewater cloudy.
Give the formula of the positive ion in A.
Give the formula of the negative ion in A.
Give the formula compound A.
Answer:
Explanation:
Ca++
CO3--
CaCO3
Match each of the elements below to a possible use for it
The elements when matched with their possible uses, gives us :
Oxygen: Generate Electricity, FireSulfur: Fireworks, Blasting CapsSelenium: Photocopiers, Dissipate Static ElectricityTellurium: PipingPolonium: WeldingWhat are the possible uses of some elements ?Oxygen is an essential element for combustion or burning. Sulfur is used in the production of sulfuric acid, which is a key ingredient in the manufacture of fertilizers, detergents, and other chemicals.
Selenium is used in the manufacture of photocopiers and other electronic devices. Tellurium is used in the production of special types of stainless steel that are highly resistant to corrosion. Polonium is a highly radioactive element that is used in some industrial applications, such as in the production of nuclear batteries.
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Before burning, the initial mass of a candle is 9.5 grams. After burning for several minutes, the final mass is 5.4 grams.
Which of the following is the best explanation for the measured masses before and after the chemical reaction?
A. The mass in the wax candle transforms into energy that is burned, hence the higher mass after the reaction.
B. The mass in the wax candle transforms into a gas that is released when burned, hence the lower mass after the reaction.
C. This cannot be an accurate measure of the final mass because the reactants and products should be equal according to the law of conservation of mass.
D. This cannot be an accurate measure of the final mass because the products should always have a greater mass than the reactants according to the law of conservation of mass.
Answer:
The correct answer is B.
Explanation:
The mass in the wax candle transforms into a gas that is released when burned, hence the lower mass after the reaction.
Burning a candle involves a chemical reaction in which the wax in the candle reacts with oxygen in the air to produce carbon dioxide and water vapor. During this reaction, some of the wax is transformed into a gas, which is released into the air. This means that the total mass of the reactants (wax and oxygen) is greater than the total mass of the products (carbon dioxide, water vapor, and unreacted oxygen), resulting in a lower mass after the reaction.
This is consistent with the Law of Conservation of Mass, which states that the total mass of the reactants is equal to the total mass of the products in a chemical reaction. However, it is important to note that in this case, the mass loss is due to the release of gas, rather than a violation of the law of conservation of mass.
what's the answerrr?? :)
Magnesium ribbon reacts with dilute hydrochloric acid. Explain how altering the concentration of the hydrochloric acid alters the rate of the reaction???? (3 marks)
Explanation:
The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).
The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.
In this reaction, the rate law can be expressed as:
Rate = k [Mg] [HCl]^x
Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.
When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.
Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.
explain the purpose of choosing two different metals as the reference to measure relative reduction potentials
The purpose of choosing two different metals as the reference to measure relative reduction potentials.
The process of determining the reduction potential of a metal necessitates the use of another metal for reference. A reference electrode with a well-known reduction potential is paired with the metal being studied as the working electrode to determine the reduction potential of the metal being studied.
There are a variety of reference electrodes available, but the standard hydrogen electrode is typically used as the reference electrode for electrochemical studies.
The standard hydrogen electrode's reduction potential has been calculated to be 0 volts. The reduction potential of a metal is a measure of the metal's tendency to gain electrons when it comes into touch with another substance. When a metal is oxidized or reduced, its reduction potential varies. As a result, when measuring reduction potentials, it is necessary to use two different metals as references.
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calculate the ph during the titration of 20.00 ml of 0.1000 m hcooh(aq) with 0.1000 m naoh(aq) after 19.55 ml of the base have been added. ka of formic acid
1.8 is the pH during the titration of 20.00 mL of 0.1000 M HCOOH (formic acid) with 0.1000 M NaOH (aq) after 19.55 mL of the base have been added
This can be calculated using the equation below:
pH = -log10([H+])
Where [H+] is the concentration of H+ ions, given by the formula:
[H+] = Ka * [HCOOH] / (Ka + [NaOH])
Ka is the acid dissociation constant of formic acid, which is 1.7 × 10-4.
Using the above equation and data, we can calculate the pH during the titration of 20.00 mL of 0.1000 M HCOOH with 0.1000 M NaOH after 19.55 mL of the base have been added as follows:
[H+] = 1.7 x 10-4 * 0.1000 / (1.7 x 10-4 + 0.1000) = 0.0156 M
Therefore, pH = -log10 (0.0156) = 1.8
Hence , the pH during given titration is 1.8 .
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How many Hydrogen atoms in the formula 4H3O2
Answer:
The chemical formula "4H3O2" represents four molecules of the compound H3O2.
The formula H3O2 can be written as (H2O) + H2O, meaning it is a combination of one water molecule (H2O) and an additional hydrogen ion (H+). The hydrogen ion (H+) is an atom of hydrogen that has lost its electron, so it has a charge of +1.
Each molecule of H3O2 contains two hydrogen atoms - one from the water molecule and one from the hydrogen ion. So, to find the total number of hydrogen atoms in 4H3O2, we need to multiply the number of hydrogen atoms per molecule by the number of molecules:
2 hydrogen atoms/molecule x 4 molecules = 8 hydrogen atoms
Therefore, there are 8 hydrogen atoms in the formula 4H3O2.
Explanation:
Wind can cause erosion that changes the surface of the Earth. Wind erosion can have negative effects on the environment by removing soil and polluting the air during dust storms. What is one way to prevent wind erosion?
A. People can drive off-road bikes across the desert.
B. Ranchers can let their cattle graze in areas with little plant growth.
C. Construction workers can wet the ground before driving on it or digging.
D. Farmers can remove all plant material in the soil between planting seasons.
One approach to stop wind erosion is for construction workers to moisten the ground before driving on it or digging.
How does wind erosion impact the surface of the Earth?Wind has the power to transfer little sand grains and other debris kilometres from their original site. It may also remove layers of sediment and dirt off the top of a landscape. By scraping against the surface or shattering into smaller pieces as they travel, the materials carried by the wind degrade the soil while they are deposited in new areas.
What harm does wind erosion cause?Impacts. Economic, health, and environmental costs associated with wind erosion include soil loss, high cleaning costs, absenteeism, transportation delays, sand-blasted crops, and retail losses.
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What is the temperature of 4. 5 moles of nitrogen gas when it has a pressure of 4. 5 atm and a volume of 3L
The temperature of 4.5 moles of nitrogen gas when it has a pressure of 4.5 atm and a volume of 3L is 36.6 K.
PV = nRT is the formula for the ideal gas equation. In this equation, P denotes the ideal gas's pressure, V the volume of the ideal gas, n the total amount of ideal gas measured in moles, R the universal gas constant, and T the temperature.
We have,
PV = nRT
4.5 x 3 = 4.5 x 0.082 x T
T = 3/0.082
T = 36.6 K
An equation that matches the product of a gas's pressure and volume to the product of its thermodynamic temperature and the gas constant. For an ideal gas, the equation is accurate, but for actual gases at low pressures, it is a decent approximation. Also known as the ideal gas equation and the ideal gas law.
Numerous gases, including nitrogen, oxygen, hydrogen, noble gases, heavier gases like carbon dioxide, and mixes like air, can be regarded as ideal gases within tolerable tolerances across a wide parameter range centred on normal temperature and pressure.
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if copper ii bromide produces cuo according the the following overall equation c u b r subscript 2 (s )space plus space 2 n a o h space (a q )space rightwards arrow with capital delta on top space c u o space (s )space plus space 2 n a b r space (a q )space plus space h subscript 2 o space (l )and 0.700 g of cubr2 are reacted, what is the theoretical yield in grams for cuo?
The theoretical yield of CuO is 0.403 g.
To calculate the theoretical yield, the first step is to determine the limiting reactant, which is the reactant that is completely consumed and thus limits the amount of product that can be formed. To do this, we need to compare the amounts of CuBr₂ and NaOH that are available, and determine which one will be used up first.
The balanced chemical equation tells us that 1 mole of CuBr₂ reacts with 2 moles of NaOH to produce 1 mole of CuO. From the given amount of CuBr₂ (0.700 g), we can convert to moles using the molar mass of CuBr₂ (223.36 g/mol):
0.700 g CuBr₂ x (1 mol CuBr2/223.36 g CuBr₂) = 0.00313 mol CuBr₂
From the amount of NaOH (not given), we can assume that there is excess NaOH, meaning that all of the CuBr2 will react and the NaOH will not be completely consumed. Therefore, we can use the amount of CuBr2 to calculate the theoretical yield of CuO:
0.00313 mol CuBr₂ x (1 mol CuO/1 mol CuBr₂) x (79.55 g CuO/mol) = 0.403 g CuO
Therefore, the correct answer is 0.403 g.
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We will do a little experiment. We will have four aquatic plants and we will put them into water with bromothymol blue. Read the right column in the table information below to see how this will be set up.
Let’s make some predictions about what we think will happen with the color change. Remember that the more carbon dioxide in the water, the more green the water will appear. The less carbon dioxide in the water, the more blue the water will appear.
Discussion Question
For each of the four plants, answer the question, “Will there be a color change?” If you think there will be a color change, explain what color you think the water will change to. If you don't think there will be a color change, explain why you think the color will stay the same.
WORTH 20 PTS!!!
Plants that have evolved to surviving in aquatic settings are known as aquatic plants (saltwater or freshwater).
What is the main function of aquatic plants?Aquatic plants offer a source of sustenance, a habitat, a way to get rid of carbon dioxide, and a way to make air through photosynthesis. Since they create sustenance for both themselves and the consumers or creatures in an environment, plants serve as its producers.
Aquatic plants do not require a solid stalk because of their buoyancy in the water. Instead, they are held erect by flotation devices like gas-filled stomata and intercellular spaces, which also allow them to develop toward the water's top and receive enough sunshine for photosynthesis.
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which of the following is true concerning successive ionizations of an atom and its ions? a) each successive ionization requires less energy to achieve. b) all ionizations require the same amount of energy. c) the amount of energy required to achieve a successive ionization doubles with each electron removed. d) each successive ionization requires increasing amounts of energy. e) the first two ionizations are endothermic but each ionization afterwards is exothermic.
The correct option is D: each successive ionization requires increasing amounts of energy
The ionization energy of an atom is the energy that is required to remove an electron from the atom or a positive ion that is produced from the atom.
When an atom loses its electron, the ion that is produced is positively charged. Successive ionization energies are the amount of energy required to remove the next electron after the first electron is removed.
Each successive ionization requires increasing amounts of energy. The first ionization energy is the energy required to remove the first electron.
After the first electron is removed, the number of electrons that are left is less, so the remaining electrons experience more attraction to the nucleus.
So, the amount of energy required to remove the second electron is more than the amount required to remove the first electron.
Similarly, as we go on removing electrons, the energy required to remove each electron continues to increase.
So, the correct option is d) each successive ionization requires increasing amounts of energy.
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An open flask is half filled with water at 25°C. Phase equilibrium can be reached after
Answer:
An open flask half-filled with water at 25°C will eventually reach phase equilibrium as the water molecules at the surface evaporate and enter the air, while some air molecules dissolve into the water. Eventually, the rate of evaporation will equal the rate of condensation, and the system will reach dynamic equilibrium.
The time it takes to reach phase equilibrium depends on various factors such as the surface area of the water, the temperature, humidity, and air movement. In a still room with a moderate humidity level, it may take several hours for the water to reach phase equilibrium. However, in a hot, dry, and windy environment, the equilibrium could be reached much faster, perhaps in a matter of minutes.
Explanation:
9,11,10 need those answers
9. The equation that represents a double replacement reaction is option B. CaBr₂+Na₂C0₂ ⃗ CaCO₃+2NaBr. 10. The chemical equation that is balanced correctly is option C. B₂ O₃ + 2C - B₄C+CO. 11. An unbalanced chemical equation is shown below:
_H₃BO₃ - _B₂O₃ + H₂O. The coefficients of the balanced equation is option D. 3:2:2
How did we arrive at this assertions?The equation that represents a double replacement reaction is:
CaBr₂ + Na₂CO₃ → CaCO₃ + 2NaBr (Option B)
The balanced chemical equation is the one that has the same number of atoms of each element on both the reactant and product sides. Among the options provided, option A, B, and D are unbalanced equations, while option C is balanced. Therefore, option C is the correct answer.
The coefficients of the balanced chemical equation for the given unbalanced equation (_H₃BO₃ - _B₂O₃ + H₂O → ) are:
3H₃BO₃ - 2B₂O₃ + 3H₂O (Option D)
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The following table was made to compare rock and minerals. What information in the table needs to be corrected?
As you answer the following questions, write explanations for why your current answer is correct
The error that has to be corrected is that minerals and rocks both have unique chemical compositions. The right answer is C.
Our bodies need minerals for appropriate growth and function; they can be found in food and on the planet. In contrast to rocks, minerals typically have distinct chemical compositions. Hence, the proper option is C. The chemical makeup of a rock mass is a key determinant in the creation of minerals inside the mass, as a specific mineral can only develop when the required elements are present. Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals. A rock is an assemblage of one or more minerals, or a body of undifferentiated mineral materials.
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Complete Question:
The following table was made to compare rocks and minerals. What information in the table needs to be corrected?
A. Rocks do have specific chemical compositions and minerals do not have specific chemical compositions.
B. Rocks include granite and marble, minerals include quartz and diamond.
C. Rocks do have specific chemical compositions and minerals do as well.
D. Rocks include quartz and diamond; minerals include granite and marble.
How many grams of F are in 295 g CaF2?
A beaker contains 50 g of ordinary (i. E. Naturally occurring) water. (a) how many moles of water are present? (b) how many hydrogen atoms? (c) how many deuterium atoms? the following information is available:
Answer:2.78 moles water
50 g / 18 g water(get from the periodic table)
Explanation:
What is the Aluminum chlorite formula
Answer:
Explanation:
Aluminum chlorite formula is :Al(ClO2)3
What volume of a 0.500 m sodium chloride solution is required to make 500. ml of a 0.100 m sodium chloride solution?
Answer:
Option D is the answer of this question
Explanation:
0.100 L
An atom with 2 protons and 4 neutrons is an
A. Positive atom
B. Neutral atom
C. Negative atom
Answer:
The answer is B!
Explanation:
Its a Neutral Atom.
How much energy is released when a 98g sample of water is cooled from 123°C to 23PC?
A student draws a model for a front that would bring heavy rainfall to an area. The diagram shows the model drawn by the student. The student made an error in the model. Which of these statements corrects the error in the model?
Cold air should have been shows advancing toward warm air, causing the warm air to sink.
What is molarity?Molarity, also known as molar concentration, is a unit of measurement used to express the concentration of a solution. It is defined as the number of moles of a solute dissolved in one liter of solution. The unit of molarity is moles per liter (mol/L), also written as M. For example, a solution with a molarity of 0.1 M contains 0.1 moles of solute per liter of solution. Molarity is commonly used in chemistry and biochemistry to describe the concentration of solutions in experiments and industrial processes.
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Complete question:
A student draws a model for a front that would bring heavy rainfall to an area. The diagram shows the model drawn by the student. The student made an error in the model. Which of these statements corrects the error in the model?
If 400cm³ of Q was collected at 250°c and 1.20×10³nm², calculate the volume it would occupy at STP
Answer:
2.481cm³
Explanation:
this is general has equation so the formula is
P1V1/T1 = P2V2/T2
At STP, pressure is 1.01*10⁵ and temperature is 273K
((1.20*10³)400)/(250+273) = ((1.01*10⁵)V2/(273)
V2 = 2.481cm³
7) For each of the following substances, decide whether it is a solution. If it is, list first solvent and then the primary solute. A. Sterling silver b. Chocolate milk c. Root beer d. Egg whites e. Rubbing alcohol f. Diver's air
Options A, B, D and E are solutions. Among all the solutions, sterling silver, egg white and rubbing alcohol are solvents and chocolate milk is a primary solute.
A solvent is defined as a substance that dissolves a solute resulting in a solution. A solvent is generally of a liquid but can also be a solid, a gas, or a supercritical fluid. A solute is defined as a substance that will dissolve into a liquid. Sterling silver is a solution and it is solvent. Chocolate milk is a solution and considered as solute. Egg white is called as an alkaline solution and contains around 149 proteins. This can be used as a favorable solvent for extracting the active ingredient. Rubbing alcohol is a solution and considered as a solvent.
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What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9. 2 atm
Answer:
When this mixture is supplied at a total pressure of 7.8 atm, the partial pressure of oxygen will be 0.0198 atm.
The amount of pressure that each gas in a mixture exerts is referred to as "partial pressure." This is found by using the formula, Partial pressure = Mole fraction × Total pressure.
Explanation:
Find the oxidation state of each of the following
1. Se in H₂SeO3
2. N in Al(NO3)3
3. H in BaH₂
4. Si in Na4SiO4
5. I in NalO4
6. O in Na2O2
7. Be in HBrO
8. N in N2O3
9. C in K2Cr2O7
10. Si in NH4AlSiO4
11. Cr in K2Cr2O7
12. Cl in Mg(ClO4)2
Answer:Let x be the oxidation station of sodium in Na
2
O
2
.
It contains a peroxide linkage in which each O atom has the oxidation number of -1.
2x+2(−1)=0
x=+1
Thus, the oxidation state of sodium in Na
2
O
2
is +1.
0. 45 moles dissolved to make 605. 0 mL of solution
What is the molarity?
The molarity (M) of a solution is defined as the number of moles of solute dissolved in one liter of solution. the molarity of the solution is 0.744 M.
We can use the formula:
M = moles of solute / volume of solution (in liters)
to calculate the molarity of the solution.
Given that 0.45 moles of solute are dissolved to make 605.0 mL of solution, we first need to convert the volume to liters by dividing by 1000:
605.0 mL / 1000 mL/L = 0.605 L
Now we can use the formula to calculate the molarity:
M = 0.45 moles / 0.605 L = 0.744 M
Molarity is a commonly used unit of concentration in chemistry, and it represents the number of moles of solute present in one liter of solution. Molarity is a useful way to express the concentration of a solution because it is independent of temperature and pressure, and it is directly proportional to the amount of solute present in the solution.
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An aqueous 0. 839 M acidic acid solution is prepared with a total volume of 0. 500 L. The molecular weight of acidic acid is 60. 05G/mole what mass of acetic acid in grams is needed for the solution
We need 25.196 grams of acetic acid to prepare the solution.
To calculate the mass of acetic acid needed for the solution, we can use the following equation:
mass = moles x molecular weight
where moles = Molarity x Volume (in liters).
In this case, we know that the molarity of acetic acid (also known as ethanoic acid) is 0.839 M and the total volume of the solution is 0.500 L. Therefore, the number of moles of acetic acid needed is:
moles = 0.839 M x 0.500 L = 0.4195 moles
Next, we can use the molecular weight of acetic acid (60.05 g/mol) to calculate the mass of acetic acid needed:
mass = 0.4195 moles x 60.05 g/mol
= 25.196 g
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what happens when steel fibers and battery touch each other please answer the question i need help ASP
Steel fibers bridge the crack at very small crack openings, transfer stresses and develop post crack strength in the concrete.
What materials make up steel fibre?Nowadays, flexural strength, crack resistance, and explosion resistance are increased by using short length steel wire or thin steel sheets. Steel fibre is the name of this unique reinforcement, and the resulting concrete is steel fibre reinforced concrete.
What varieties of steel fibres are there?In order to study the effects of steel fibre and the volume content ratio of fibre on the compressive, splitting, and tensile strengths of high-strength lightweight aggregate concrete (HLAC), three different types of steel fibers—micro (M), end-hooked (H), and corrugated (C)—that are frequently used in engineering applications are added to HLAC.
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