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neonofarm [45]
3 years ago
8

2 point

Chemistry
1 answer:
Luden [163]3 years ago
7 0

Answer:

21

Explanation:

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Which of these properties is the best one to use for identification of an element? 1.the number of neutrons in the atomic nucleu
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The right answer is 2.

The number of protons contained in a nucleus (called an atomic number) is characteristic of a chemical element. For a given atomic number, the number of neutrons defines different "types" of this element: isotopes. The variation of the number of protons of the nucleus of an atom, during a nuclear reaction for example, causes a change of the element studied.

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If I want to accelerate a mass of 3 kg at 5 m/s2 then how much force should I apply?
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<u>Explanation:</u>

Force exerted on the object is defined as the product of mass of the object and the acceleration of the object.

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F=m\times a

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3 years ago
If 2.9g of water is heated from 23.9C to 98.9C, how much heat (in calories) was added to the water?
tensa zangetsu [6.8K]

Answer:

Explanation:

we know that

ΔH=m C ΔT

where ΔH is the change in enthalpy (j)

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we know that given mass=2.9 g

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