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2 years ago

PLEASE HELP!!!

Chemistry

2 answers:

umka21 [38]2 years ago

7 0

Answer:

the answer is A

Explanation:

physical changes does not change the property of matter.

Serhud [2]2 years ago

5 0

Answer: A

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.

According to this statement the option A that is, melting point is a physical property of matter because when a substance melts, it changes from a solid to a liquid but it still the same substance explains a specific character of a physical property

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Explanation:

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Which of the following vary for isotopes of atoms of the same element?

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Answer:

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soldier1979 [14.2K]

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Describe Rutherford's contribution to the atomic model.

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Answer:

Rutherford's experiment, also known as

$\alpha - scattering \: experiment$

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Explanation:

In the above diagram, Rutherford was trying to explain his contributions using thin foils of gold and other metals as targets for alpha particles from a radioactive source.

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3 years ago

An atom's nucleus has 92 protons and its mass number is 235. how many neutrons are in the nucleus? what is the name of the atom

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The mass number is the sum of the protons and neutrons in an atom. 235-92 = 143 neutrons.
Element 92 is Uranium.

Uranium is also the highest atomic number element which exists in nature. All of the rest above element 92 only exist nuclear high-energy reactions (the transuranium elements), and most experience nuclear decay very quickly and form other elements with fewer protons.

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3 years ago