if a buffer is composed of 25.94 ml of 0.132 m acetic acid and 22.48 ml of 0.115 m sodium acetate, how many millimoles (mmol) of sodium acetate are present?

Answer:

they are called isotopes

Answer:

The molarity of the final solution  is 1.7 M

Explanation:

The parameters given are;

First solution = 400 ml of 1.25 M

Second solution = 300 ml of 2.30 M

Therefore, we have;

First solution contains 400/1000 * 1.25 moles = 0.5 moles of the substance

Second solution contains 300/1000 * 2.30 moles = 0.69 moles of the

Hence the sum of the two solutions contains 0.5 + 0.69 = 1.19 moles of the substance

The volume of the sum of the two solutions = 400 ml + 300 ml = 700 ml

Hence we have the concentration of the final solution presented as follows;

700 ml contains 1.19 moles of the substance

Therefore;

1000 ml will contain 1000/700 * 1.19 = 1.7 moles

The molarity of the final solution = The number of moles per 1000 ml = 1.7 M.

Answer:

No, they would not be balanced because their weights would change.

Explanation:

Weight is the effect that gravitational pull has on objects on Earth whereas mass is how much matter there is in an object. Mass does not change despite gravitational pull, but the force of gravity (weight) is different depending on where you are.

The carbon atom marked with * is a primary carbon atom.

A primary carbon atom is a carbon atom that is attached to only one other carbon atom in the organic molecule. These types of carbon atoms are usually attached to a functional group or hydrogen atom in organic chemistry.

Organic chemistry is a branch of chemistry that deals with the study of organic compounds which contains carbon as well as hydrogen atoms. These compounds can be found in both living and nonliving things. Carbon is the basis of life and is essential for living organisms.

Carbon is able to form stable covalent bonds with other carbon atoms as well as other elements such as hydrogen, oxygen, nitrogen, sulfur, and halogens. Carbon atoms are able to form chains, rings, and branches, which makes organic molecules very diverse.

The structure of an organic compound is important because it determines its chemical and physical properties. The functional groups present in the molecule determine its chemical reactivity and how it interacts with other molecules. Physical properties such as melting and boiling points, solubility, and density are also determined by the structure of the molecule.
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Answer:

Mass = 5.24 g

Explanation:

Given data:

Number of atoms of Ca = 7.9×10²² atoms

Mass of Ca = ?

Solution:

First of all we will calculate the number of moles by using Avogadro number.

1 mole contain 6.022×10²³ atoms

7.9×10²² atoms × 1 mol /6.022×10²³ atoms

1.31 ×10⁻¹ mol

0.131 mol

Mass of Ca:

Mass = number of moles × molar mass

Mass = 0.131 mol × 40 g/mol

Mass = 5.24 g

The given statement "the formation of disulfide bonds is a vital part of a protein's secondary structure" is false.

The formation of disulfide bonds is not a vital part of a protein's secondary structure but rather plays a crucial role in stabilizing a protein's tertiary structure. Secondary structure refers to the local folding patterns of a protein chain, primarily involving the formation of alpha-helices and beta-sheets through hydrogen bonding between amino acid residues. Disulfide bonds, on the other hand, occur when two cysteine residues within a protein form a covalent bond between their sulfur atoms.

Disulfide bonds are important for maintaining the overall three-dimensional structure and stability of a protein. They are commonly found in proteins secreted outside the cell or proteins that need to withstand harsh environments. Disulfide bonds contribute to the protein's folding, shape, and stability by providing additional covalent bonds that help to hold the protein's structure together.

Therefore, while disulfide bonds are significant for a protein's overall structure, they are not directly involved in the formation of secondary structures like alpha-helices and beta-sheets.

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When exactly one mole of chrysene, C18H12(s) is burned at 25°C in a bomb calorimeter, ÎE = 14,297 kJ/mol.


To calculate the energy released, you need to first determine the molar mass of chrysene: Molar Mass of C18H12(s) = 180.2 g/mol

Next, use the following equation: ÎE = (molar mass of chrysene) x (heat of combustion)

Heat of combustion of C18H12(s) = -79,072 J/g

Therefore, ÎE = (180.2 g/mol) x (-79,072 J/g) = -14,297 kJ/mol.

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Answer:

there are 4 possible isomers

Answer:

I. Concrete sidewalks

Explanation:

One of the factor that affects the infiltration of water into the surface of the soil is the use of concrete sidewalks.

Concrete is impermeable and non - porous media

When concrete pavements are used, water will not be able to move into the ground. They run on the surface and collects into nearby streams and water bodies.

19.6 × ( 1 mol KOH / 56 grams KOH )

= 0.35 mol KOH

_________________________________

0.35 mol KOH ×( 2 mol H2O / 2 mol KOH )

= 0.35 mol H20

_________________________________

0.35 mol H2O × ( 18 g H2O / 1 mol H2O )

= 6.3 grams H2O

Answer:

400cm^3

Explanation:

d = 2.5gcm^-3

m = 1 kg or 1000g

v = ?

The formula that incorporates all three is:

d = m/v

In order to find out v, rearrange the formula:

v = m/d

Thus,

v = 1000/2.5 = 400cm^3

Answer:

Single replacement

Explanation: Al is replacing Cu

The reaction of prop-2-en-1-ol with HBr in the presence of a peroxide catalyst would produce a product that exists as optical isomers.

Prop-2-en-1-ol (allyl alcohol) has a chiral center, which means that it can exist as optical isomers. To form a product that could exist as optical isomers, the reagent should react with the chiral center of the molecule, causing it to become asymmetric.

One reagent that could achieve this is hydrogen bromide (HBr) in the presence of a peroxide catalyst. This reaction, known as hydrobromination, involves the addition of HBr across the double bond of prop-2-en-1-ol to form 2-bromopropan-1-ol. The addition of HBr to the double bond creates a new chiral center, which results in the formation of two enantiomers of the product.

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The light energy is converted to chemical energy in the grass (option C).

A food chain is the feeding relationships between species in a biotic community. Living organisms feed on one another to obtain energy.

According to this question, a food chain is given involving the following animals in order of energy transfer:

Sun, grass, grasshopper, frog, bird

The producer in the food chain is responsible for creating the chemical energy that is transferred from one organism to another via the process of photosynthesis.

According to this question, grass is the producer in the food chain, hence, will convert light to chemical energy.

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Two types of gases that tend to concentrate in and along low areas are the alkanes butane and propane (option d).

These gases are both classified as heavier-than-air gases, meaning their densities are greater than that of air, causing them to settle in low-lying areas. Butane and propane are commonly used as fuel sources for various applications, such as heating and cooking.

However, their tendency to accumulate in low areas poses a risk, as the buildup of these gases can lead to dangerous situations such as fires or explosions if ignited. Proper ventilation and gas detection systems are crucial in areas where butane and propane are in use, to prevent hazardous situations.

Additionally, it is important to store and handle these gases with care to minimize the risk of leaks or accidents.Thus,  butane and propane are two heavier-than-air gases that tend to concentrate in low areas, requiring proper safety measures to mitigate potential hazards.

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non-Metals:

Nitrogen.

Oxygen.

Helium.

Sulfur.

Chlorine.

Explanation/Answer:

Metal atoms have only a few electrons in their outer shell whereas non-metal atoms have lots of electrons in their outer shell. This means that metals tend to react with non-metals. When a metal reacts with a non-metal, electrons transfer from the metal to the non-metal.

HOPE I HELPED!!

Explanation:

Given :

speed of light (c) =

\(3.00 \times 108m/s\)

wavelength (λ) =

\(4.3 \times {10}^{ - 7} \: m\)

Equation :

c = λv

v = c/λ

\(v = \frac{3.00 \times {10}^{8} }{4.3 \times {10}^{ - 7} } \)

Simplify

\(v = 6.976744186 \times {10}^{14} \)

The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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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

In an aqueous solution, the hydrate that forms the most is the one with the greatest stability. Therefore, the greater the stability of the hydrate, the more it forms in an aqueous solution. Therefore, the ketone that forms the most hydrate in an aqueous solution is acetone.

Water molecules tend to be associated with the carbonyl group of the ketones through hydrogen bonds. The hydrate with the greatest stability is the one that has the most extensive hydrogen bonding network. Ketones have a more polar nature than alkanes. Because of this, they can interact more effectively with the polar water molecules in the surrounding environment. The degree of solvation of the carbonyl group increases when the size of the alkyl substituents of the ketones grows. In addition, the reactivity of the carbonyl group diminishes as the size of the alkyl substituents increases, lowering the capacity of the carbonyl group to interact with water molecules.

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Answer:

kylee is the best

Explanation:

Answer:

243.05 gm of Fe2O3

Explanation:

From periodic table   mole wt of Fe = 55.845 gm

  170 g / 55.845 gm/mole = 3.044 moles  Fe

From equation

 4 Fe ====> 2 Fe2 O3

      so 1/2 as many moles  as Fe    3.044 / 2 = 1.522 moles of Fe2O3

             mole wt of Fe2 O3   from periodic table = 159.687 gm/mole

                       1.522 moles * 159.687 gm/mole = 243.05 gm

Answer:

the time required for one half of a sample of a radioisotope to decay

Answer: A. They were traveling through different types of rocks

Explanation:

Answer: Data

Explanation:

The answer is data because data is important pieces of evidence that is collected in a table or a graph.

Answer:

B. Data

Explanation:

Cuz is said so duh

Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

When refrigerant is in a high-pressure, high-temperature state, it enters the metering device. The refrigerant is then changed to a low-pressure, low-temperature state as a result of the metering device. As a result, the refrigerant will expand and the heat will be absorbed as the temperature decreases.

The metering device is a component in a refrigeration or air conditioning system that ensures that the correct amount of refrigerant is delivered to the evaporator. The device functions as a flow control, reducing the refrigerant's pressure before it reaches the evaporator. The metering device may be a simple capillary tube, an orifice, an automatic expansion valve (AEV), or a thermostatic expansion valve (TXV). The capillary tube is the simplest and least expensive metering device. It's just a small copper tube that's thin and long. The AEV is a constant pressure valve that maintains a consistent pressure drop across it, allowing it to regulate the refrigerant flow. A thermostatic expansion valve is the most sophisticated metering device, as it can sense the temperature at the evaporator outlet and adjust the refrigerant flow accordingly.

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When 1.00 kcal of heat is applied, the water sample's final temperature is T = 50.0°C + 40.0°C = 90.0°C.

The amount of energy required to raise a substance's temperature is measured in terms of specific heat. It is the amount of energy (measured in joules) required to increase a substance's temperature by one degree Celsius per gram.

We must first determine the water sample's original temperature. The formula is as follows:

Q = mcΔT

Inputting the values provided yields:

700.00 cal = 25.0 g x 1.00 cal/g °C x (50°C - 22.0°C)

When we simplify this equation, we obtain:

ΔT = 700.00 cal / (25.0 g x 1.00 cal/g °C) = 28.0°C

Therefore, the initial temperature of the water sample is 22.0°C + 28.0°C = 50.0°C.

Inputting the values provided yields:

1.00 kcal = 25.0 g x 1.00 cal/g °C x (T - 50.0°C)

When we simplify this equation, we obtain:

T - 50.0°C = 1.00 kcal / (25.0 g x 1.00 cal/g °C) = 40.0°C

Therefore, When 1.00 kcal of heat is applied, the water sample's final temperature is T = 50.0°C + 40.0°C = 90.0°C.

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