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meriva
2 years ago
10

Which of the following represent isotopes of the same element?

Chemistry
1 answer:
Vladimir [108]2 years ago
3 0

Answer:

c. 1, 3 and 4

Explanation:

Isotopes of the same element have the same number of protons. Isotopes 1, 3 and 4 all have an atomic number of 92 meaning they have the same amount of protons (92 protons) and therefore belong to the same element.

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What is the difference between a physical change and a chemical change? give examples for both​
Tanya [424]

Answer:

Physical change is a temporary change. A chemical change is a permanent change.

Explanation:

A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition.

7 0
3 years ago
A chemist measures the energy change Delta H during the following
Ann [662]

Answer: 1) endothernic

2) Yes absorbed

Explanation:

Decomposition is a chemical reaction in which one reactant gives two or more than two products. All decomposition reactions are endothermic reactions as energy is absorbed to break the bonds.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative.

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2 years ago
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How much does Promethium cost per gram?
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7 0
3 years ago
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A spectrophotometer measures the transmittance or the absorbance, or both, of a particular wavelength of light after it has pass
lutik1710 [3]

Answer:

The cuvette will only fit into the spectrophotometer in one orientation.

Explanation:

There is an arrow always marked on the cuvette that indicates how to place it inside the spectrophotometer. The sides of the cuvette also have small edges that if light passes through them, spurious light can be detected due to poor positioning. The spurious light does not get through the entire sample, if we want to measure the absorbance. With a cuvette in the indicated position, the procedure is measured and its reference value is taken, and then compared with other cuvettes to be used.

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