Q: Which equation correctly represents the Law of Conservation of Mass?

$\text{mass}_{\text{reactants}} = \text{mass}_{\text{products}}$

Question 1

Which of the following best describes the difference between a physical change and a chemical change?

Accepted Answer

A chemical change results in the formation of new substances, while a physical change does not.

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

Question 3

A student mixes two clear solutions and observes the formation of a precipitate. This observation is evidence of:

Accepted Answer

A chemical change

Question 4

Which of the following is NOT a sign of a chemical change?

Accepted Answer

Melting of a solid

Question 5

Which equation correctly represents the Law of Conservation of Mass?

Accepted Answer

$	ext{mass}_{	ext{reactants}} = 	ext{mass}_{	ext{products}}$

Question 6

During a chemical reaction, the total mass of the system:

Accepted Answer

Remains constant

Question 7

Which of the following is a physical property?

Accepted Answer

Density

Question 8

Which of the following is a chemical property?

Accepted Answer

Ability to burn

Question 9

A student observes that iron nails left outside become rusty. This is an example of:

Accepted Answer

A chemical change

Question 10

Which of the following statements about the Law of Conservation of Mass is correct?

Accepted Answer

Mass is neither created nor destroyed during a chemical reaction.

Question 11

Which of the following scenarios best illustrates a physical change?

Accepted Answer

Water freezing into ice

Question 12

If 10 g of hydrogen reacts with 80 g of oxygen to produce water, what is the total mass of water produced according to the Law of Conservation of Mass?

Accepted Answer

90 g

Question 13

Which of the following is NOT a chemical property?

Accepted Answer

Density

Question 14

Which of the following is a sign that a chemical change has occurred?

Accepted Answer

Formation of a new substance

Question 15

A student heats a sample of sugar and observes it turning brown and producing a sweet smell. This is evidence of:

Accepted Answer

A chemical change

Question 16

Which of the following is an example of a physical property?

Accepted Answer

Melting point

Question 17

Which of the following is an example of a chemical property?

Accepted Answer

Ability to react with acid

Question 18

Which of the following is NOT a sign of a chemical change?

Accepted Answer

Change in state

Question 19

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

The mass of the reactants equals the mass of the products.

General Chemistry Study Notes: Atomic Structure, Electron Configurations, and Periodic Trends

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