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stira [4]
2 years ago
11

When a substance changes from one phase to another, which of the following occurs?

Chemistry
1 answer:
Shkiper50 [21]2 years ago
8 0

Answer:

B

Explanation:

The average kinetic energy of the Substance changes.

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How many neutrons are present in an atom with atomic number 9 and mass number 19?​
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Answer:

10 neutrons

Explanation:

N=Z-A ie. number of neutrons=mass number-atomic number

N=19-9=10

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Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, ha
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Answer:

TRUE.

Explanation:

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2H isotope has 1 proton and 1 neutron.

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This meeans 2H isotope has fewer neutrons when compared to the 3H isotope. The correct option is TRUE.

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