About 940 kg (to three significant figures) of chalcopyrite must be mined to obtain 325 g of pure Cu.
What is Molar Mass?
It is calculated by adding up the atomic masses of all the atoms in a molecule or formula unit. The atomic masses are taken from the periodic table and are usually given in atomic mass units (amu) or unified atomic mass units (u).
We can start by setting up a proportion, where x is the mass of chalcopyrite in kilograms that must be mined:
(mass of Cu in grams obtained from x kg of CuFeS2) / (mass of CuFeS2 in kg) = (mass of pure Cu obtained) / (mass of Cu in the sample)
From the chemical formula of chalcopyrite (CuFeS2), we know that 1 mole of CuFeS2 contains 1 mole of Cu. The molar mass of Cu is 63.55 g/mol, and the molar mass of CuFeS2 is 183.52 g/mol.
So, the mass of Cu in x kg of CuFeS2 is:
(1 mol Cu / 1 mol CuFeS2) × (63.55 g/mol Cu) × (x kg CuFeS2 / 183.52 g/mol CuFeS2) = 0.346 x kg Cu
The mass of CuFeS2 in x kg is simply x kg. Substituting the given values into the proportion, we get:
0.346 x kg / x kg = 0.325 kg / 0.001 kg
Solving for x, we get:
x = (0.325 kg / 0.001 kg) / 0.346 = 940.18 kg
Therefore, about 940 kg (to three significant figures) of chalcopyrite must be mined to obtain 325 g of pure Cu.
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The difference in electronegativity between C and F is
The electronegativity difference between C (carbon) and F (fluorine) is approximately 1.5.
What is electronegativity?Electronegativity is a measure of an atom's ability to attract electrons towards itself when it is part of a chemical bond. Fluorine is the most electronegative element on the periodic table, with an electronegativity value of 4.0, while carbon has an electronegativity value of 2.5.
The electronegativity difference between two atoms in a bond determines the polarity of the bond and the distribution of electrons within the molecule. In the case of C and F, the bond is polar covalent, with the electron density being pulled more towards the fluorine atom due to its higher electronegativity.
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Is this possible? Why or why not?
In the nineteenth and twentieth centuries, cast iron—also known as gray cast iron—was a type of pipe that was utilized as a pressure pipe for the transfer of water and sewage.
Fertiliser :Any natural or manufactured product that is applied to soil or plant tissues to provide nutrients for plants (see spelling variations) is an example. It is possible to differentiate fertilizers from liming materials and other non-nutritious soil additives.
Iron oxide :Iron oxide, a chemical that is used a lot, is known as rust. Iron's rapid interaction with oxygen results in the formation of iron oxide, or Fe₂O₃, which is so common that pure iron rarely occurs in nature.
Potassium chromate :The inorganic compound potassium chromate is a yellowish, crystalline substance that, when heated, releases toxic chromium fumes. Potassium chromate is a strong oxidizing specialist and is extremely destructive. Both the dyeing processes for textiles and the production of dyes make use of this material.
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What is the C - O bond order in NCO?
Answer:
The resonense structures as follows:
Explanation:
Refer to the image attached for the full answer.
Can someone fill chart up?
The non bonding pairs , geometry of electron pairs, and geometry of atoms of the remaining molecules has been given in the tavble attached below.
What is a Lewis structure?A Lewis structure, also known as a Lewis dot diagram, is a two-dimensional representation of a molecule that shows the arrangement of atoms in the molecule and the valence electrons around each atom. In a Lewis structure, the valence electrons are represented as dots around each atom, and the bonds between atoms are represented as lines. The purpose of a Lewis structure is to show how the valence electrons are distributed in the molecule and how the atoms are connected to one another. This can help to predict the chemical and physical properties of the molecule.
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Technological changes throughout history have impacted different areas of study. Choose an area of study that is of
Answer:
particular interest to you and describe how technological changes have impacted it over time.
One area of study that has been significantly impacted by technological changes over time is medicine. From the invention of the microscope in the 17th century to the development of advanced imaging technologies like MRI and CT scans in the 20th century, medical technology has played a crucial role in advancing our understanding of the human body and in developing new treatments for diseases.
Advancements in medical technology have also allowed for the development of new surgical techniques and tools, such as minimally invasive surgeries and robotic surgeries, which have led to faster recovery times and reduced risk of complications for patients.
In recent years, the rise of digital health technologies and the increased use of electronic health records have also transformed the way that healthcare is delivered and managed. These technologies have enabled healthcare providers to better track and analyze patient data, leading to more personalized and effective treatments.
Overall, the impact of technological changes on medicine has been profound, leading to improved outcomes for patients and new discoveries in the field of healthcare. As technology continues to evolve, it is likely that we will see even more advancements in the field of medicine in the years to come.
Explanation:
A 2.5 g sample of sucrose (C12H22O11) was burned in excess oxygen in a calorimeter which contained 2190.0 g of water. The temperature of the water (specific heat = 4.184 J/g℃) increased from 20.50 °C to 25.01 °C.
The concentration of the sucrose solution is:
C = n / V = n / (m / ρ) = (0.0073 mol) / (0.509 g / 1 mL / 1.00 g/cm³) = 0.144 M.
The first step is to calculate the amount of heat released by the combustion of sucrose using the balanced chemical equation:
C12H22O11 + 12O2 → 12CO2 + 11H2O
From the equation, we can see that 1 mole of sucrose produces 12 moles of CO2 and 11 moles of H2O. The molar mass of sucrose is 342.30 g/mol, so the number of moles in 2.5 g is:
n = 2.5 g / 342.30 g/mol = 0.0073 mol
Therefore, the combustion of 2.5 g of sucrose produces:
12 mol CO2 × 0.0073 mol = 0.0876 mol CO2
11 mol H2O × 0.0073 mol = 0.0803 mol H2O
The amount of heat released by the combustion of sucrose can be calculated using the standard enthalpy of combustion ΔH°comb = -5648 kJ/mol:
q = ΔH°comb × n = (-5648 kJ/mol) × 0.0073 mol = -41.23 kJ
This heat is absorbed by the water in the calorimeter, so we can use the equation:
q = mcΔT
where q is the heat absorbed by the water, m is the mass of the water, c is the specific heat of water, and ΔT is the temperature change.
Substituting the given values, we get:
-41.23 kJ = (2190.0 g)(4.184 J/g℃)(25.01 °C - 20.50 °C)
Solving for the mass of water, we get:
m = -41.23 kJ / [(2190.0 g)(4.184 J/g℃)(25.01 °C - 20.50 °C)] = 0.509 g
Therefore, the mass of water is 0.509 g, and the total mass of the solution is:
m = 2.5 g sucrose + 0.509 g water = 3.009 g.
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Calculate the following and provide the answers rounded off to the correct accuracy
(8.12 - 0.9800) g ×(3.4501 + 0.16) mL
29.15 g mL Calculate the following and provide the answers rounded off to the correct accuracy.
What is accuracy?Accuracy is a measure of how closely a given set of data or results match their expected values. It is a measure of the degree of correctness and precision of a system's output. Accuracy is often expressed as a percentage and can be determined by comparing a system's results to known or accepted values. Accuracy is important in many fields, from scientific research, to medicine, to engineering, to business, and beyond. It is essential for achieving accurate results and making decisions based on reliable data.
The calculation for this problem is (8.12 - 0.9800) g × (3.4501 + 0.16) mL = (7.14 g) × (3.61 mL) = 25.8954 g mL. Rounded off to the correct accuracy, the answer is 29.15 g mL.
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Give the systematic name for each of the following organic molecules and enter it in the space provided. Be sure to include appropriate punctuation.
A complicated molecule known as an organic is mainly composed of carbon atoms joined to other atoms of the same element and/or other carbon atoms.
Where are organic molecules?In general, scientists classify a particle as organic if it includes at least one other element in addition to carbon. That ingredient is typically one of hydrogen, oxygen, nitrogen, or sulfur. According to some definitions, an organic molecule must contain both carbon and hydrogen.
Organic molecules can be found in the tissues of animals, plants, bacteria, and fungi; in horns and nails, fallen leaves, eggs, fruits, and vegetables; and in wood, milk, paper, petroleum, and gasoline.
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For all the reactions, identify the reaction type and name the products formed.
1) Draw (Name) 5 structural isomers of pentene
2) Provide the balanced chemical equation for the complete combustion of propan-2-ol
3) 2 moles of Fluorine gas react with 2-methylpropane (provide at least two structural isomers)
4) 4-methylpent-1-ene reacts with hydrogen bromide (identify major and minor products if necessary)
5) Reaction of 2-methylpropan-1-ol with acidified potassium permanganate
6) Reaction of butan-2-ol with acidified potassium permanganate
7) Reaction of pentan-3-one with NaAlB4
8) Reaction between ethanol and ethanoic acid.
9) Name the reactants needed to prepare propyl ethanoate. Write an equation to show the reaction
10) Provide the equation for the hydrolysis of propyl propanoate.
11) Provide the equation for the hydrolysis N, N-dimethyl propanamide
12) How would you prepare ethoxyethane from ethene? Provide equations/reactions
13) How would you prepare propanoic acid from prop-1-ene? Provide equations/reactions
14) Place the following organic molecules in order of increasing boiling points: butane, butan-2-one, butanoic acid, and butan-2-ol. Justify your answer.
50 POINTS PLEASE BE ACCURATE AND CORRECT
Which of the following is a possible way to describe the H2O component in the reaction below?
2HCI(aq) + Ca(OH)2(aq) --> 2H2O(I) + CaCl2(aq)
that H2O is on the opposite end of the equation, this is one of the reaction's products. We can therefore refer to the H2O element as just a product.
By a product, what do you mean?The thing being sold is called a product. An item or service can be considered a product. Physical, virtual, or cyberspace forms are all possible. Every good has a price because it costs money to produce it. The market, quality, marketing, and intended market group all affect the price which can be paid.
Describe by-product using an example.Anything that is created while another product is being manufactured or processed is known as a by-product. The by-product of is the source of the raw material.
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Answer:
the correct ansrew is c
Explanation:
because there are 2 molecules of h2o
What changes chemically during a reaction?
Products
Reactants
Coefficient
Subscripts
Answer: Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
In a sealed and rigid container, a sample of gas at 3.25 atm and 210.0 °C is cooled to 0.0 °C. What is the pressure (in atm) of the gas at 0.0 °C?
Answer:
The pressure of the gas at 0.0 °C is 1.84 atm.
Explanation:
To solve this problem, we can use the combined gas law, which states that the equation relates the pressure, volume, and temperature of a gas:
(P1 x V1) / T1 = (P2 x V2) / T2
where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.
We are given:
P1 = 3.25 atm
T1 = 210.0 °C = 483.15 K (convert to Kelvin)
T2 = 0.0 °C = 273.15 K (convert to Kelvin)
Since the container is rigid, the volume (V1) and final volume (V2) are the same. Therefore, we can simplify the equation to:
P1 / T1 = P2 / T2
Substituting the given values, we get:
(3.25 atm) / (483.15 K) = P2 / (273.15 K)
Simplifying, we get:
P2 = (3.25 atm x 273.15 K) / 483.15 K
P2 = 1.84 atm
Calculate the moles of BaCO3
that is present in
150 mL of
0.650 M Solution. Convert the
moles to grams using molar mass
of BaCO3.
There are 0.0975 moles of BaCO3 present in 150 mL of 0.650 M solution, which is equal to 13.4 grams of BaCO3.
Are moles and molarity the same?Molarity (M) is calculated by dividing the volume of the solution (V) in litres by the number of moles of solute (n). Not moles of solute per litre of solvent, but rather moles of solute per litre of solution, is a crucial distinction to make when defining molarity.
moles = concentration x volume
150 mL = 150/1000 L = 0.15 L
Then we can use the formula to find the moles of BaCO3:
moles = concentration x volume
moles = 0.650 mol/L x 0.15 L
moles = 0.0975 mol
Next, we can convert the moles of BaCO3 to grams using the molar mass of BaCO3:
molar mass of BaCO3 = 137.33 g/mol (from periodic table)
mass = moles x molar mass
mass = 0.0975 mol x 137.33 g/mol
mass = 13.4 g (rounded to one decimal place)
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Ammonia gas and oxygen gas react to form water vapor and nitrogen monoxide gas. What volume of water would be produced by this reaction if 1.9L of ammonia were consumed?
2.87 L of water vapor would be produced for every 1.9 L of consumed ammonia.
What is ammonia?One nitrogen atom and three hydrogen atoms make up the colorless gas known as ammonia, which has a strong odor. It has the molecular formula NH3. Ammonia is very soluble in water, making liquid form convenient to handle and store.
How do you determine it?The balanced chemical formula for the ammonia and oxygen reaction that produces water vapor and nitrogen monoxide is:
4 NH3(g) + 5 O2(g) = 4 NO (g) + 6 H2O(g)
We can see from the equation that everything balances out that 6 moles of water vapor are created for every 4 moles of ammonia that is consumed. This ratio can be used to determine how much water vapor will be created when 1.9 L of ammonia is consumed.
We must first translate the amount of ammonia from liters to moles. Every gas has a 22.4 L/mol molar volume at standard temperature and pressure (STP).
1.9 L of ammonia is equal to:
1.9 l / 22.4 l/mol=0.085 moles of ammonia.
Next, we can determine how many moles of water vapor were created using the mole ratio from the balanced equation:
6 moles of H2O are created from 4 moles of NH3.
x moles of H2O are produced from 0.085 moles of NH3.
x=(0.085 moles NH3) x (6 moles H2O/ 4 moles NH3) = 0.128 moles H2O
Using the molar volume, we can finally convert the moles of water vapor generated at STP to volume:
0.128 moles of H2O x 22.4 L/mol = 2.87 L of H2O
Consequently, 2.87 L of water vapor would be produced for every 1.9 L of consumed ammonia.
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change the units. (1) 5055 mm to m
Answer:
To convert 5055 mm to m, we need to divide by 1000 (since there are 1000 mm in 1 m):
5055 mm ÷ 1000 = 5.055 m
Therefore, 5055 mm is equal to 5.055 m.
Explanation:
how many grams of carbon is there in 100g of glucose
The molecular formula of glucose is C6H12O6, which means it contains 6 carbon atoms.
To calculate the mass of carbon in 100g of glucose, we can use the molar mass of glucose and the molar mass of carbon to find the mass fraction of carbon in glucose:
The molar mass of glucose (C6H12O6) is 180.16 g/mol (6 carbon atoms x 12.01 g/mol + 12 hydrogen atoms x 1.01 g/mol + 6 oxygen atoms x 16.00 g/mol).
The molar mass of carbon is 12.01 g/mol.
The mass fraction of carbon in glucose is:
(6 carbon atoms x 12.01 g/mol) / (1 molecule of glucose x 180.16 g/mol) = 0.4
This means that 40% of the mass of glucose comes from carbon. Therefore, in 100g of glucose, there would be:
100g x 0.4 = 40g of carbon.
So, there are 40 grams of carbon in 100g of glucose.
If 3.90 g of CuNO3 is dissolved in water to make a 0.840 M solution, what is the volume of the solution in milliliters?
Answer:
49.6ml
Explanation:
formula: L solution = mols/M
First convert CuNO3 to mols by using its molar mass. 93.56 g
then plug into the formula I gave. 3.90 g CuNO3=0.0417 mols
Chemistry Help!!
1. Determine the number of moles of gas present in the following problems
a. 3.0 L of helium gas held in a balloon at STP
b. 3.0 L of helium gas held in a balloon with a temperature of 33 degrees Celsius and a pressure of 99.5 kPa.
c. While resting, the average 70-kg human male consumes 14 L of pure O2 per hour at 25 degrees Celsius and 100.0 kPa. How many moles of oxygen are consumed by the man during this time?
Answer:
a. At STP, the temperature is 273 K and the pressure is 101.3 kPa. Therefore, the number of moles of helium gas present in a 3.0 L balloon at STP is:
n = PV/RT = (101.3 kPa)(3.0 L) / (8.31 J/K/mol)(273 K)
n = 0.1209 mol
b. To solve for the number of moles of helium gas at a different temperature and pressure, we need to use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we convert the temperature to Kelvin: T = 33°C + 273 = 306 K
Then we can solve for n:
n = PV/RT = (99.5 kPa)(3.0 L) / (8.31 J/K/mol)(306 K)
n = 0.109 mol
c. The number of moles of oxygen consumed by the man can be found using the ideal gas law:
n = PV/RT
We are given the pressure, volume, and temperature, so we can plug those in and solve for n. However, we need to convert the volume from L to m3 and the pressure from kPa to Pa:
V = 14 L = 0.014 m3
P = 100.0 kPa = 100000 Pa
T = 25°C + 273 = 298 K
n = PV/RT = (100000 Pa)(0.014 m3) / (8.31 J/K/mol)(298 K)
n = 0.006 mol
Therefore, the man consumes 0.006 moles of oxygen per hour.
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why are mass and volume extensive properties and why is density and intensive property?
Answer:
Mass and volume are extensive properties because they depend on the size or amount of matter present in a system. For example, if we double the amount of a substance, its mass and volume will also double. Extensive properties are additive and their value changes with the size or amount of the system.
On the other hand, density is an intensive property because it does not depend on the amount of matter present in a system, but only on its composition and physical state. Density is defined as the mass of a substance per unit volume, which means that for a given substance, the density will always be the same regardless of the size or amount of the sample. Intensive properties are not additive and their value is independent of the size or amount of the system.
Determine the hybrid orbital of this molecule.
A. sp³
B. sp²
C. sp
D. sp³d
Answer:
Answer choice (A). sp^3 hybridization
Explanation:
When looking at what hybrid orbital may form when given just a lewis dot structure, you have to consider both the attached atoms and lone pairs.
This H2O molecule has two attached atoms (the hydrogens) and two lone pairs (the dots attached to the oxygen). When hybridized, the lone pairs will try to get as far away from the other atoms as possible, giving us a tetrahedral geometry that occupies 4 positions.
For all the reactions, identify the reaction type and name the products formed.
1) How would you prepare ethoxyethane from ethene? Provide equations/reactions
2) How would you prepare propanoic acid from prop-1-ene? Provide equations/reactions
3) Place the following organic molecules in order of increasing boiling points: butane, butan-2-one, butanoic acid, and butan-2-ol. Justify your answer.
Answer:
1) Ethoxyethane can be prepared from ethene by the reaction of ethene with ethanol in the presence of a catalyst such as sulfuric acid. This is an example of an addition reaction.
Equation:
C2H4 + C2H5OH → C4H10O (ethoxyethane)
2) Propanoic acid can be prepared from prop-1-ene by the reaction of prop-1-ene with potassium permanganate (KMnO4) in the presence of water. This is an example of an oxidation reaction.
Equation:
CH2=CHCH3 + 2KMnO4 + 3H2O → CH3CH2COOH (propanoic acid) + 2MnO2 + 2KOH
3) The order of increasing boiling points is: butane < butan-2-ol < butan-2-one < butanoic acid.
Butane is a nonpolar molecule and has only weak London dispersion forces between its molecules, so it has the lowest boiling point.
Butan-2-ol has a polar hydroxyl group (-OH) which allows for hydrogen bonding between its molecules, increasing its boiling point compared to butane.
Butan-2-one has a polar carbonyl group (C=O) which also allows for dipole-dipole interactions between its molecules, increasing its boiling point compared to butan-2-ol.
Butanoic acid has a polar carboxyl group (-COOH) which allows for hydrogen bonding between its molecules, making it the most polar and highest boiling compound among the given options.
5) What volume of a 9 M BeSO4solution contains 90 grams of BeSO4?
A) 21 mL
B) 38 mL
C) 77mL
D) 95 mL
Answer:
The molar mass of BeSO4 is:
9 + 32 + (4x16) = 137 g/mol
To calculate the volume of a 9 M solution containing 90 grams of BeSO4, we can use the formula:
moles = mass / molar mass
moles = 90 g / 137 g/mol
moles = 0.657 g
Then, we can use the formula:
M = moles / volume (in liters)
Rearranging this formula, we get:
volume (in liters) = moles / M
volume (in liters) = 0.657 / 9
volume (in liters) = 0.073 L
Finally, we convert the volume from liters to milliliters:
volume (in mL) = 0.073 L x 1000 mL/L
volume (in mL) = 73 mL
Therefore, the answer is not one of the choices provided. The closest option is C) 77 mL.
while you are taking a morning shower, what are the control objective, you are measurement and the manipulated variables at your disposal?
The control objective of a morning shower is to provide a comfortable and refreshing start to the day, and the manipulated variables at your disposal can be adjusted to achieve this objective.
What is Measurement?
Measurement is the process of assigning a numerical value to a physical quantity or property of an object or system. Measurements are made using instruments or tools that are designed to detect and quantify the property of interest, such as length, weight, temperature, time, or electrical current.
In science and engineering, accurate measurements are essential for understanding the behavior of natural and engineered systems, and for developing theories and models that can predict future behavior. Measurements are also important for quality control, product testing, and monitoring environmental conditions, among other applications.
The control objective during a morning shower could be to maintain a comfortable water temperature for the duration of the shower. The measurement variable could be the temperature of the water, which can be monitored using a shower thermometer or by feeling the water with your skin. The manipulated variable at your disposal could be the hot and cold water knobs, which can be adjusted to maintain the desired water temperature.
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Which of the following best defines an acidic solution?
acid can kill and decay bodies if your needing to get rid of human remains
Using just a Bohr model, how can you tell if two elements are in the same group (column) on the periodic table? The same period (row)?
"Using the Bohr model, we can determine the number of valence electrons an atom has. The valence electrons are the electrons in the outermost energy level (shell) of an atom, which are responsible for the atom's chemical behavior.
Elements in the same group (column) on the periodic table have the same number of valence electrons. For example, all elements in Group 1 (the alkali metals) have one valence electron, while all elements in Group 2 (the alkaline earth metals) have two valence electrons.
In the Bohr model, the number of valence electrons is equal to the number of electrons in the outermost shell. For example, in the Bohr model of hydrogen, there is one electron in the first energy level (shell), which is also the valence electron.
Therefore, if two elements have the same number of valence electrons in their Bohr models, they are in the same group (column) on the periodic table.
On the other hand, elements in the same period (row) on the periodic table have the same number of energy levels (shells). For example, all elements in the second period (row) have two energy levels (shells), while all elements in the third period (row) have three energy levels (shells).
In the Bohr model, the number of energy levels is equal to the number of shells or orbits around the nucleus. For example, in the Bohr model of helium, there are two electrons in the first energy level (shell) and no electrons in the second energy level (shell), which means that helium is in the first period (row) of the periodic table.
Therefore, if two elements have the same number of energy levels in their Bohr models, they are in the same period (row) on the periodic table." (ChatGPT, 2023)
A pressure cooker uses pressure to
A. boil water at a lower temperature than its normal boiling point.
B. heat food more slowly because the pressure is lower.
C. cook food in a bath of steam instead of liquid water.
D. keep water as a liquid at hotter temperatures than its normal boiling point.
A pressure cοοker uses pressure tο bοil water at a lοwer temperature than its nοrmal bοiling pοint.
Thus οptiοn A is cοrrect.
In a pressure cοοker, dοes the water bοil at a lοwer temperature?Water bοils at 100°C (212°F) when yοu cοοk in a typical saucepan at atmοspheric pressure (14.7 pοunds per square inch [psi]). A pressure cοοker's inside can experience an additiοnal 15 psi οf pressure, οr almοst 30 psi. Water bοils at 121°C (250°F) at that pressure.
What is the purpοse οf a pressure cοοker?Pressure cοοkers make it simple tο swiftly create dishes that are slοw-cοοked. They are gοοd fοr tenderising less expensive cuts οf meat and efficient in terms οf electricity use.
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Use complete sentences to explain the advantage of using binomial nomenclature in the system of classification. Also explain what kind of information you can get about the organism from its scientific name.
The benefit of a binormal nomenclature is that it properly names animals within a species of living things by providing a two-part name that is either based on Latin or another language.
The genus and the second portion of the particular name are categorized using one part. Homo sapiens would be an illustration of this (for humans).
Calling living things by a two-part name is a benefit of utilising binomial nomenclature in the system of classification.
The generic name, which makes up the first part of the name, indicates the genus to which the species belongs, while the specific name, also known as a specific epithet, identifies the species within the genus.
Carl Linnaeus created the binomial nomenclature, a system for naming species in science. In his massive work Systema Naturae (The System of Nature), Linnaeus made an effort to enumerate all known plant and animal species.
The conventions of binomial nomenclature were established in this work, which was published in a number of portions between 1735 and 1758 and is still in use today. To add clarity to discussions about organisms, evolution, and ecology in general, binomial nomenclature was developed.
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The initial concentration of A is 0.165 M and after 116 s the concentration has decreased to 0.111 M.
a) What is the value of the rate constant k?
the value of the rate constant k is 0.00734 s^-1.
What is the first-order integrated rate law, and how can it be used to determine the rate constant k?
ln[A]t = -kt + ln[A]0
Where [A]t is the concentration of A at time t, [A]0 is the initial concentration of A, k is the rate constant, and ln represents the natural logarithm.
We can rearrange the equation to solve for k:
k = (ln[A]0 - ln[A]t) / t
Plugging in the values given in the problem:
[A]0 = 0.165 M
[A]t = 0.111 M
t = 116 s
k = (ln[0.165] - ln[0.111]) / 116 s
Using a calculator, we get:
k = 0.00734 s^-1
Therefore, the value of the rate constant k is 0.00734 s^-1.
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Chemistry-Which one is it
london dispersion forces (LDF)
dipole-dipole
hydrogen bonding
The structure given in question is hydrogen bonding. Hydrogen bonding is a special type of dipole-dipole attraction between molecules.
What is hydrogen bonding?Hydrogen bond is an electrostatic force of attraction between hydrogen atom which is covalently bound to a more electronegative "donor" atom/ group and another electronegative atom bearing lone pair of electrons— hydrogen bond acceptor.
Hydrogen bonding is a special type of dipole-dipole attraction between molecules and not a covalent bond to hydrogen atom. It results from attractive force between hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
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The mass of a piece of metal is 30.4571 grams. When the piece of metal was dropped into a graduated cylinder that had an initial water volume of 6.45 cm³, the total volume increased to 9.90 cm³. What is the density of the piece of metal in g/cm³?
Answer: 8.824 g/cm³
Explanation: To find the density of the piece of metal, we must divide the mass by the volume of the metal. To find the metal's volume, we subtract the initial volume from the total volume.
Volume of metal = Final Volume - Initial Volume
Volume of metal = 9.90 - 6.45
Volume of metal = 3.45 cm³
Now, we can implement the metal's volume into the division process to find the density:
Density = 30.4571 ÷ 3.45
Density = 8.824 g/cm³
Hence, the density of the piece of metal is 8.824 g/cm³.