Which of the following units would be best for measuring the mass of a penny?
A. Grams
B. Kilograms
C. Milligrams
D. Centigrams

Tropical forests remove around 30%  of carbon dioxide emitted from the atmosphere. About 5% of the world's carbon emissions are absorbed by the Amazon rainforest, which is estimated to absorb 2 billion tons of CO2 annually.

This is a tremendous amount of carbon dioxide in the atmosphere, more than any other biome on our planet. The planet gets warmer when too much carbon is in the atmosphere, which also helps land plants grow more. An overabundance of carbon in the sea makes the water more acidic, placing marine life in danger.

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Answer:

purifying copper to produce copper wiring for homes

Explanation:

Answer:

b.purifying copper to produce copper wiring for homes

Explanation:

The structure of aldohexose is drawn.

D-glucose is an aldohexose, which means it is a 6-carbon sugar with an aldehyde group (-CHO) at one end. It is a crucial molecule in the metabolism of living organisms and is the primary source of energy for most cells. D-glucose exists in two forms, alpha and beta, which differ in the orientation of the hydroxyl (-OH) group at C1.

D-glucose can also form ring structures, with the aldehyde group reacting with a hydroxyl group on another carbon atom. These ring structures can also exist in alpha and beta forms, depending on the orientation of the -OH group attached to the ring oxygen. Overall, D-glucose plays a critical role in the biochemistry of life, serving as a building block for complex carbohydrates and other biomolecules.

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Ivan Pavlov is most known for demonstrating conditioned lreflex in dogs.

Conditioned reflex is a reflex action which has been conditioned to occur even without the stimulus which produces the reflex.

Ivan Pavlov is known to demonstrate conditioned reflex in dogs.

In his experiment, he trained dogs to salivate at the sound of a bell even if food which is the stimulus that produces salvation was not present.

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Answer:

A conditioned reflex is a reflex action that has been trained to occur even when the stimulus that causes the reflex is not present.

Ivan Pavlov is recognized for using dogs to illustrate conditioned reflexes.

He trained dogs to salivate at the sound of a bell even when food, the stimulus that induces salvation, was not present in his experiment.

Explanation:

The number of carbon atoms in 2.50 g of butane will be 1.03×10²³ atoms.

Given in the question:-

Mass of butane (C₄H₁₀) = 2.5 g

Mole of butane = weight of butane/molecular weight of butane

Mole of butane = 2.5/58

Number of Carbon atoms = (mole of butane) × (number of Carbon atoms in butane)×Nₐ

= 2.5/58 × 4 × 6.022×10²³

= 10×6.022×10²³/58

= 1.03 × 10²³

Therefore, the number of carbon atoms in 2.50g of carbon atoms will be 1.03 × 10²³.

Butane is a hydrocarbon and a highly flammable, colourless, odourless, easily liquefied gas. It is generally used as a fuel for lighters and portable stoves, a propellant in aerosols, a heating fuel, a refrigerant, and in the manufacture of a wide range of products.

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The difference in lattice energies between MgCl2 and CaCl2 is 269 kJ.

2.    lattice disassociation enthalpy of magnesium oxide is greater than that  of magnesium chloride.

because magnesium chloride consist of 3 ions in total , whereas magnesium oxide has 2 ions and oxide ions are smaller than chloride ions, Which  means that the ions are closer together in the lattice of magnesium oxide than magnesium chloride , and which also increases the strength of the attractions.

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Answer:

40.8g of sodium sulfate must be added

Explanation:

The reaction of barium nitrate, Ba(NO₃)₂ with sodium sulfate, Na₂SO₄ is:

Ba(NO₃)₂ + Na₂SO₄ → 2 NaNO₃ + BaSO₄(s)

That means, for a complete reaction of an amount of barium nitrate you must add the same amount in moles of sodium sulfate. To solve this problem we need to convert the mass of barium nitrate to moles = Moles of sodium sulfate that must be added:

Moles Ba(NO₃)₂ -Molar mass: 261.3g/mol-:

75g * (1mol / 261.3g) = 0.287 moles = Moles Na₂SO₄

Mass Na₂SO₄ -Molar mass: 142.04g/mol-:

0.287 moles * (142.04g / mol) =

Answer:

1.37 L

Explanation:

(87.0)(0.492)(643)÷(39.1)(515)

27522.972 ÷ 20136.5

=

1.36682005314

↓

1.37 (Rounded)

Hope this Helps!

Answer:

1.37 L

Explanation:

XD

Answer:

type decomposition

balance form

2PbO₂⇒ 2PbO +O₂

Explanation:

Answer:

ill give you a brief answer

normally when o2 is attached it is a combustion reaction so this reaction tells that p4 is burned in presence of air to form p4o10 which is the ash that remains

the balanced equation tells that 5 moles of o2 is rrquired to burn 1 mole of p4 to form 1 mole of p4o10

The given balanced equation is tells us about,

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Answer:

1. Hydrogen will diffuse faster.

2. The ratio of diffusion of hydrogen gas to that of the unknown gas is 4 : 1

Explanation:

Let the rate of diffusion of hydrogen gas, H2 be R1

Let the molar mass of H2 be M1

Let the rate of diffusion of the unknown gas be R2.

Let the molar mass of the unknown gas be M2.

Molar mass of H2 (M1) = 2x1 =2g/mol

Molar mass of unknown gas (M2) = 16 times that of H2

= 16 x 2 = 32g/mol

1. Determination of the gas that will diffuse faster. This is illustrated below:

R1/R2 = √(M2/M1)

R1/R2 = √(32/2)

R1/R2 = √16

R1/R2 = 4

Cross multiply

R1 = 4R2

From the above calculations, we can see that the rate of diffusion H2 (R1) is four times the rate of diffusion of the unknown gas (R2).

Therefore, hydrogen will diffuse faster.

2. Again, from the calculations made above, the ratio of diffusion of hydrogen (R1) to that of the unknown gas (R2) is given by;

R1/R2 = 4

Therefore, the ratio of diffusion of hydrogen (R1) to that of the unknown gas (R2) is:

4 : 1

To solve this problem, we'll use the Beer-Lambert Law and the information given.

(a) According to the Beer-Lambert Law, the absorbance (A) is directly proportional to the concentration (c) of the absorbing species:

A = εlc

where A is the absorbance, ε is the molar absorptivity constant, l is the path length (in cm), and c is the concentration (in M).

Given:

Slope of the Beer's Law plot (εl) = 3.5 × \(10^3\)

Absorbance (A) = 0.700

Since we have a 1 cm path length, the slope (εl) is equal to the molar absorptivity constant (ε).

Substituting the values into the equation, we can calculate the equilibrium concentrations:

ε = \(3.5*10^3 M^{(-1)} cm^{(-1)}\)

A = 0.700

Using the Beer-Lambert Law equation, we can rearrange it to solve for the concentration (c):

c = A / (εl)

For Fe3+:

c(Fe3+) = A / (εl) = 0.700 / (3.5 × \(10^3\)) = 2 ×\(10^{(-4)}\) M

For SCN-:

c(SCN-) = A / (εl) = 0.700 / (3.5 × \(10^3\)) = 2 × 1\(0^{(-4)}\) M

For FeSCN2+:

Since FeSCN2+ is the product of the reaction between Fe3+ and SCN-, the concentration of FeSCN2+ at equilibrium will be zero until the reaction reaches equilibrium.

Therefore, the equilibrium concentrations are:

[Fe3+] = 2 × \(10^{(-4)}\) M

[SCN-] = 2 × \(10^{(-4)}\) M

[FeSCN2+] = 0 M

(b) To calculate the equilibrium constant (Keq), we'll use the equation:

Keq = ([FeSCN2+]) / ([Fe3+][SCN-])

Substituting the given values:

Keq = (0) / (\((2 * 10^{(-4)})^2\)) = 0

Therefore, Keq is equal to 0.

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Answer:

Biology is the study of nature, like plants and animals, while anatomy is the study of the human body, like our bones and muscles.

Explanation:

Hope it helped!

Answer:

q)What are lewis acid and lewis base?

a)Lewis Acid:- a compound or ionic species which can accept an electron        pair.

Lewis Base:- a compound or ionic species which can donate an electron pair

Answer:

I think this is the right answer. I researched this. I am not sure if this is the right answer.

Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes. The double lines indicate zones of spreading from which plates are moving apart

Explanation:

A pure substance refers to a substance that consists of only one type of particle or molecule. It is uniform in composition and exhibits consistent physical and chemical properties throughout.

In contrast, impure substances, also known as mixtures, consist of two or more different substances mixed together. An example of a pure substance is distilled water. Distilled water consists solely of water molecules (H₂O) and does not contain any other substances or impurities. It is obtained by the process of distillation, which involves boiling water to vaporize it and then condensing the vapor back into liquid form. Distilled water is free from minerals, contaminants, and other dissolved substances, making it a pure substance. Other examples of pure substances include elements such as oxygen (O₂), nitrogen (N₂), and gold (Au), as well as compounds like sodium chloride (NaCl) and glucose (C₆H₁₂O₆), provided they are in their pure forms without any impurities. In summary, a pure substance is a sample that consists of only one type of particle or molecule, exhibiting uniform composition and consistent properties throughout. Distilled water serves as an example of a pure substance due to its sole composition of water molecules.

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Answer:

Explanation:

Rhizobium bacteria were soil microbes that have the ability to convert dissolved nitrogen from the atmosphere. These root nodules on woody plants contain rhizobium bacteria.

The nitrogen cycle is finished by denitrification, which turns nitrate (NO3-) back into gaseous nitrogen (N2). The driving force behind this procedure is denitrifying microorganisms. These bacteria generate energy from nitrate rather than oxygen, which results in the release of nitrogen gas into the environment.

Azotobacter, Bacillus, Clostridium, or Klebsiella species are a few instances that belong to this category of nitrogen-fixing bacteria. These organisms must acquire their own energy source, as was previously said. Typically, they do this by oxidising organic molecules generated by the other organisms or as a result of decomposition.

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A problem that can be tested using the scientific method is the association between greenhouse gases and global warming, in this case, the dependent variable is the temperature, the independent variable is the amount of gas and the controlled variables may be the presence of non-greenhouse gases.

A controlled variable in an experiment is any conditions manipulated by the researcher that allow us to make comparisons regarding the change in the dependent variable.

Therefore, with this data, we can see that controlled variables in an experiment are useful to determine the extension of the change in the dependent variable.

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0.0451 moles of KMnO4 and 7.18 grams of KMnO4 are required to produce 11.4 grams of KNO3.

The chemical equation for the reaction is

5 KNO₂ + 2KMnO₄ + 3 H₂SO₄ →5 KNO₃ + K₂SO₄ + MnSO₄ + 3 H₂O

From the equation, we see that for every 5 moles of KMnO2, 5 moles of KNO3 are produced, and for every 2 moles of KMnO4, 5 moles of KNO3 are produced.

Determine the number of moles of KNO3 produced, which can be calculated from the mass of KNO3 (11.4 g) and its molar mass (101.1 g/mol):

11.4 g KNO3 / 101.1 g/mol = 0.1129 moles KNO3

Since 5 moles of KMnO2 produce 5 moles of KNO3, 2 moles of KMnO4 produce 5 moles of KNO3.

This means that for every 0.1129 moles of KNO3, 0.1129 moles / (5/2) = 0.0451 moles of KMnO4 are required.

Convert the number of moles of KMnO4 to mass by multiplying by its molar mass (158.0 g/mol):

0.0451 moles KMnO4 * 158.0 g/mol = 7.18 g KMnO4

How do you convert moles to mass?

Multiply the molecular weight by the number of moles for the substance. The molecular weight is the number of grams per mole for the substance and gives the conversion factor for moles to grams for that particular substance.

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Answer:

Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.

Explanation:

Answer:

B. allow for bonding metals to be stable.

Explanation:

edge 2022

27.7g is the mass of  9.3 x10²⁴ molecules of glucose. The mole signifies 6.022×10²³ units, which is a very big quantity.

In chemistry, a mole, sometimes spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or even other predetermined particles. The mole signifies 6.022×10²³ units, which is a very big quantity.

Under the International System of Units (SI), the mole is defined as this quantity as of May 20, 2019, according the General Meeting on Weights and Measurements. The amount of atoms discovered via experimentation to be present in 12 grams pure carbon-12 was originally used to define the mole.

number of moles = given number of particles/  6.022×10²³

number of moles = 9.3 x10²⁴  /  6.022×10²³

                            = 15.4mole

mass of glucose = 15.4x180.1=27.7g

Therefore, 27.7g is the mass of  9.3 x10²⁴ molecules of glucose.

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Explanation:

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To react completely with 50.0g of nitrogen gas (N2), we would need approximately 10.820 grams of hydrogen gas (H2).The correct number of significant figures, is 10.8 g H2.

To determine the amount of hydrogen gas (H2) required to react completely with 50.0g of nitrogen gas (N2), we need to use stoichiometry.

The balanced equation is:

N2 + 3H2 → 2NH3

From the equation, we can see that the molar ratio between nitrogen gas and hydrogen gas is 1:3. This means that for every 1 mole of N2, we need 3 moles of H2 to react completely.To find the moles of nitrogen gas (N2) in 50.0g, we need to divide the mass by the molar mass of nitrogen (28.02 g/mol):

moles of N2 = 50.0g / 28.02 g/mol = 1.784 mol

Since the molar ratio between N2 and H2 is 1:3, we can multiply the moles of N2 by the ratio to find the moles of H2 required:

moles of H2 = 1.784 mol N2 × (3 mol H2 / 1 mol N2) = 5.352 mol H2

Now, we can convert the moles of H2 to grams by multiplying by the molar mass of hydrogen (2.02 g/mol):

grams of H2 = 5.352 mol H2 × 2.02 g/mol = 10.820 g H2

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Answer:

Explanation:

Here, we want to calculate the initial volume of the container

Mathematically, we know that volume and pressure are inversely related. What this means is that as volume increases, pressure is expected to decrease and as pressure increases, volume is expected to decrease

A mathematical link between these two is as follows:

The above is according to Boyles' law.

The values with subscript 1 are the initial values, while the values with the subscript 2 are the final values

Thus:

V1 = ?

P1 = 1.25 atm

V2 = 1L

P2 = 3.75 atm

From the relation:

Answer:

I know the other person already said this but it would be the last option : )

Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

Input in Ksp

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.

Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).

A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.

Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

Therefore, 1.8 x 10⁻³ is the molar solubility.

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Answer:

2)====We assume you are converting between moles CaCl2 and gram. You can view more details on each measurement unit: molecular weight of CaCl2 or grams This compound is also known as Calcium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CaCl2, or 110.984 grams

110.98 g/mol

The molar mass of CaCl2 is 110.98 g/mol.

3)The molar mass of Na3 PO4 is 163.9 g/mol. To determine the molar mass, add the atomic mass of all the atoms.