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Zepler [3.9K]
3 years ago
12

Which of the following is an example of a physical change in matter?

Chemistry
2 answers:
sineoko [7]3 years ago
5 0

Answer is B.

Explanation:

A physical change is one in which there is no change in chemical composition of a substance. while a process in which there is change in chemical composition it is called a chemical change.


dsp733 years ago
5 0

b. bending of sodium metal because it is still sodium metal just bent

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The correct option is (C) 6.02 X 10²³

A sample of CH₄O with a mass of 32.0 g contains <u>6.02 X 10²³</u> molecules of CH₄O.

To calculate the number of moles;

Molar mass of CH₄O = C + 4(H) + O

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          = 32.04 g/mol

So, 1 mol of CH₄O = 32.04 g of CH₄O

Given, 32.0 g of CH₄O

According to Avagadro's constant 1 mole of a substance contains 6.022× 10^23 particles (molecules, atoms or ions).

 = (32.0 g/1)(1 mol CH₄O/32.04 g CH₄O)(6.02x10²³/1 mol CH₄O)

 = 6.02 X 10²³ molecules of CH₄O

Hence, a sample of  will contain  number of molecules 6.02 X 10²³ molecules.

Learn more about the Moles calculation with the help of the given link:

brainly.com/question/21085277

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2 years ago
Describe the process of inhalation and exhalation with regard to the contraction of the diaphragm – which is an active process a
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When aqueous solutions of potassium fluoride and hydrochloric acid are mixed, an aqueous solution of potassium chloride and hydr
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Answer:

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Explanation:

KF (aq) +  HCl (aq) →  KCl (aq)  + HF (aq)

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