Volume is the
variable, and the
temperature of the gas is the
variable.
DONE

Answer:

A. mass

Explanation:

On edgenuity 2020

The property of matter that is conserved in chemical reactions is mass. The correct option is A.

The law of conservation of mass implies that mass is never be created nor destroyed in a chemical reaction.

The law of conservation of mass, also known as the principle of mass conservation, implies that for any system closed to all transfers of matter and energy.

The mass of the system must remain constant over time, because the system's mass cannot change, and thus quantity cannot be added or removed.

The law of conservation of mass was critical to the advancement of chemistry.

It assisted scientists in understanding that substances did not disappear as a result of a reaction, as they may appear to do, but rather transformed into another substance of equal mass.

Thus, the correct option is A.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

To prepare the desired solution, the mass of the solute (sucrose) must be calculated based on the desired percentage concentration and the total mass of the solution.

To prepare a 15% by mass solution with a total mass of 650g, the mass of sucrose needed to be dissolved into water is 97.5 grams. This can be calculated by multiplying the total mass of the solution by the percent by mass concentration as shown below:

Mass of sucrose = 15% x 650g = 97.5g.

Therefore, 97.5g of sucrose needs to be dissolved into water to prepare a 15% by mass solution with a total mass of 650g.

To prepare a 15% by mass solution with a total mass of 650g, 97.5 grams of sucrose needs to be dissolved into water. This is determined by multiplying the total mass of the solution (650g) by the percentage by mass concentration (15%). The resulting mass of sucrose (97.5g) is then dissolved into the water to make the solution.

In conclusion, to prepare the desired solution, the mass of the solute (sucrose) must be calculated based on the desired percentage concentration and the total mass of the solution.

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Explanation:

At the start of the citric acid cycle, a molecule of oxaloacetate accepts a two-carbon acetyl group from acetyl CoA to form citrate. This reaction kicks off the citric acid cycle; thus, oxaloacetate is required for the cycle to take place.

To begin the citric acid cycle, an oxaloacetate molecule accepts a two-carbon acetyl group from acetyl CoA to form citrate. Because this reaction initiates the citric acid cycle, oxaloacetate is required for the cycle to occur.

The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a chain of reactions that occurs in the mitochondria and is used by almost all living cells to produce energy through aerobic respiration. It consumes oxygen and emits water and carbon dioxide as byproducts.

All aerobic organisms use a series of chemical reactions to generate energy by converting acetate derived from carbohydrates, fats, and proteins into carbon dioxide.

The citric acid cycle involves the attachment of an acetyl group from acetyl CoA to a four-carbon oxaloacetate molecule to form a six-carbon citrate molecule.

Thus, Citrate is oxidized in a series of steps, releasing two carbon dioxide molecules for each acetyl group fed into the cycle.

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The dot (.) in the chemical formula CuSO₄·5H₂O indicates the presence of a hydrated compound. It signifies that there are water molecules (H₂O) associated with the main compound, in this case, copper(II) sulfate (CuSO₄).

CuSO₄·5H₂O is known as copper(II) sulfate pentahydrate. It consists of one molecule of CuSO₄ combined with five water molecules. The dot acts as a separator between the main compound and the water molecules, indicating that they are physically associated but can be separated from each other.

The presence of water molecules in a compound can affect its properties, such as its crystalline structure, color, and stability. In the case of CuSO₄·5H₂O, the hydrated form is a bright blue crystalline solid, whereas anhydrous copper(II) sulfate (CuSO₄) is a white powder. The dot serves to distinguish between these different forms of the compound.

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Answer: 4.1 milliliters

Answer:

Generally, density is measured using he SI unit for measurement of density which is kg/m³ or the cgs units used to describe the density of a substance which is g/cm³

However, due to its nature (being composed of varying amount proportions of different compounds mixed together resulting in a variation of the density of naturally produced crude oil) of having different densities whereby the lighter oils are more easily processed than the heavier variety of oils, oil density is related to the quality of the oil and it is usually measures in API gravity as follows;

°API = (141.5/S.G.) - 131.5

Where;

API = American Petroleum Institute

S. G. = Specific gravity

As such the API gravity of fresh water with a S. G. of 1.0 has is 10 degrees

Explanation:

Explanation:

Hi,

The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.

I hope this helps :)

If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.

An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.

According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.

Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.

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1.905 M is the concentration in m (moles/l) of a solution that is 12.0% by weight of nitric acid.

To calculate the concentration in moles per liter (M) of a 12.0% by weight nitric acid (HNO₃) solution, follow these steps:
1. Determine the molecular weight of HNO₃:
HNO₃ = 1 (H) + 14 (N) + 3 × 16 (O) = 1 + 14 + 48 = 63 g/mol
2. Convert the percentage concentration to a mass concentration:
12.0% by weight means that there are 12.0 g of HNO₃ in 100 g of solution.
3. Calculate the moles of HNO₃ in the 100 g solution:
moles = mass / molecular weight
moles = 12.0 g / 63 g/mol = 0.1905 mol
4. Determine the volume of the solution:
Assume that the density of the solution is close to that of water, which is 1 g/mL.
Since there are 100 g of solution, the volume would be approximately 100 mL or 0.1 L.
5. Calculate the concentration in moles per liter (M):
concentration (M) = moles / volume
concentration (M) = 0.1905 mol / 0.1 L = 1.905 M
The concentration of the solution is approximately 1.905 M.

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The passage suggests that the nucleus of a hydrogen atom is responsive to external magnetism.

The passage implies that the nucleus of a hydrogen atom is similar to a bar magnet in its responsiveness to external magnetism. Just like a bar magnet, the nucleus of a hydrogen atom can be influenced or affected by external magnetic fields.

This suggests that the nucleus possesses some inherent magnetic properties, making it susceptible to magnetic forces from its surroundings. Hydrogen atoms consist of a single proton in their nucleus, which carries a positive charge.

The proton, like a tiny magnet, generates a magnetic field due to its spin and charge. This property allows the nucleus to interact with external magnetic fields. When exposed to an external magnetic field, the nucleus aligns itself either parallel or anti-parallel to the field, depending on its orientation.

This responsiveness to external magnetism has significant implications in various fields of science. It forms the basis for nuclear magnetic resonance (NMR), a technique widely used in chemistry, physics, and medicine for studying molecular structures and analyzing chemical environments.

In NMR spectroscopy, the behavior of hydrogen nuclei in a sample is manipulated and measured using external magnetic fields, providing valuable insights into the sample's composition and properties.

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Answer:

yes

Explanation:

the energy released in the synthesis of water is equal to the energy absorbed in the decomposition of water. This outcome happens because the difference in energy between the reactants and the products in both cases is equal. . It follows the law of conservation of energy.

The balanced net ionic equation for the reaction of aqueous sodium carbonate and aqueous magnesium nitrate is:

\2Na+(aq) + CO32-(aq) + Mg2+(aq) + 2NO3-(aq) → MgCO3(s) + 2Na+(aq) + 2NO3-(aq)
The net ionic equation is obtained by canceling out the spectator ions on both sides of the equation. In this case, the sodium ions (Na+) and nitrate ions (NO3-) are the spectator ions.
The net ionic equation is:
\CO32-(aq) + Mg2+(aq) → MgCO3(s)
This shows that the carbonate ions (CO32-) and magnesium ions (Mg2+) react to form solid magnesium carbonate (MgCO3).However, the net ionic equation only includes the species that participate in the reaction, which are the sodium carbonate anion (CO3^2-) and the magnesium cation (Mg^2+):

\CO3^2-(aq) + Mg^2+(aq) → MgCO3(s)

Note that the sodium and nitrate ions are not included in the net ionic equation because they are spectator ions and do not participate in the reaction.

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The mass of the copper sample is approximately 43.96 grams.

To determine the mass of the copper sample, you can use the heat equation:

q = mcΔT

where q is the heat absorbed (1.26 kJ), m is the mass of the copper, c is the specific heat capacity (0.385 J/g°C), and ΔT is the temperature change (75°C).

First, convert the heat absorbed from kJ to J: 1.26 kJ * 1000 = 1260 J.

Now, rearrange the equation to solve for the mass (m):

m = q / (cΔT)

Plug in the values:

m = 1260 J / (0.385 J/g°C * 75°C)

Calculate the mass:

m ≈ 43.96 g

The mass of the copper sample is approximately 43.96 grams.

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Answer:

Substitution and Na(No3) + Fe

Explanation:

Answer:

Kinetic energy has its determining factors and those are mass and speed or velocity

whereas the determining factors of potential energy are height, distance and mass.

EXAMPLE OF K.E

kinetic energy could be flowing water...

EXAMPLE OF P.E

potential energy is the water that is present at the top of the hill.

Answer:

The answer is D. The rate of the forward reaction is greater than the rate of the reverse reaction.

Explanation:

The forward reaction rate was greater than the reverse reaction rate because more product is present at time 2. This is the answer from ap classroom.

The given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.

The chemical reaction has been given by the combination of reactants for the formation of product. The reactants combine in the fixed proportion to form the product.

The rate of reaction has been defined as the rate of formation of product or the disappearance of reactants.

The forward reaction has been given as the rate of formation of product. The reverse reaction has been given as the rate of dissociation of product.

In the given condition, the number of reactant at time 1 are more than the reactant at time 2. This states that there has been increased formation of the product at time 2.

Thus, the given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.

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Answer:

The answer is C. Plasma

Answer:

An element is made of atoms

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{1.3 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 2.159468...\)

We have the final answer as

Hope this helps you

Answer:8.334×10^-6 moles

Explanation:

a mole is 6.023×10^23

5.02×10^18 ÷ 6.023×10^23=8.33×10^-6

Answer:

No. Gasoline and diesel fuel is. Steel is an alloy of iron, carbon, and various other metals- but it is not distilled.

Answer:

gasoline

Explanation:

Yes, the data suggests natural selection in stickleback fish, as the chart shows a decrease in full armor frequency.

The stickleback fish is well known for its adaptability and is often studied in the context of natural selection. In this case, if the original population trapped in the lake thousands of years ago had full armor, it suggests that they were better equipped to defend against predators.

However, over time, environmental conditions might have changed, leading to different selection pressures. The chart indicates a decrease in the frequency of stickleback fish with full armor, which implies that individuals with reduced or no armor had a higher survival or reproductive advantage.

This change in the population's armor characteristics suggests that natural selection has occurred. Individuals with reduced armor were likely more successful in their environment, allowing their traits to become more prevalent over generations.

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Answer:

Explanation:

1 standard deviation range will look like: [average - SD, average + SD]

Here the miximum value will be: average - SD = 2.6 - 0.80 = 1.80 ml

and the maximum value will be: average + SD = 2.6 + 0.80 = 3.40ml

Answer:

1.204x10²⁴ molecules of water

Explanation:

The ethane dioic acid is the same oxalic acid. The molecular formula of oxalic acid is:

C2H2O4

Usually, the oxalic acid is dihydrated, that means contains 2 moles of water per mole of acid.

Using Avogadro's number, 1 mole of ethane dioic acid contains 6.022x10²³ molecules of ethane dioic acid. As we have 2 molecules of water per molecule of ethane dioic acid, the molecules of water are.

6.022x10²³ molecules ethane dioic acid * (2molecules Water / molecule Ethane Dioic acid) =

The mole fraction of the solute in this solution is 0.333.

The mole fraction, represented by χ, is a measure of the amount of one component of a solution relative to the total number of moles in the solution. It is defined as the number of moles of solute divided by the total number of moles in the solution.
Mole fraction can be used to calculate various properties of solutions, such as vapor pressure, boiling point elevation, freezing point depression, and osmotic pressure.

It is an important concept in physical chemistry and is often used in chemical engineering applications.
To calculate mole fraction, one must know the number of moles of each component in the solution. Let's say we have a solution containing 5 moles of solute and 10 moles of solvent. The mole fraction of the solute can be calculated as follows:
χsolute = number of moles of solute / total number of moles in solution
χsolute = 5 / (5 + 10)
χsolute = 0.333
It is important to note that mole fraction is a dimensionless quantity and is expressed as a ratio or a decimal fraction. The sum of the mole fractions of all components in a solution is always equal to 1.
In summary, mole fraction is a measure of the relative amount of one component in a solution and is calculated by dividing the number of moles of solute by the total number of moles in the solution. It is used to calculate various properties of solutions and is an important concept in physical chemistry.

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Explanation:

La reacción entre un ácido y una base se llama neutralización. Cuando en la reacción participan un ácido fuerte y una base fuerte se obtiene una sal y agua. Si una de las especies es de naturaleza débil y la neutralización se produce en disolución acuosa también se obtiene su respectiva especie conjugada y agua.