Question 1

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

Accepted Answer

Density

Question 2

A student mixes sand and salt together. This mixture is best classified as:

Accepted Answer

A heterogeneous mixture

Question 3

Which statement best describes a chemical property?

Accepted Answer

It can only be evaluated by changing the chemical identity of the substance.

Question 4

According to the law of conservation of mass, if 10 g of hydrogen reacts with 80 g of oxygen to form water, what is the total mass of water produced?

Accepted Answer

$$90\ \mathrm{g}$$

Question 5

Which of the following is a pure substance?

Accepted Answer

Carbon dioxide

Question 6

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout

Question 7

Which of the following changes is a chemical change?

Accepted Answer

Burning of wood

Question 8

Which of the following statements is true according to the law of conservation of mass?

Accepted Answer

The mass of products is always equal to the mass of reactants.

Question 9

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with oxygen

Question 10

A sample of matter is uniform throughout and can be separated into two substances by a chemical process but not by a physical process. This sample is best classified as:

Accepted Answer

A compound

Question 11

Which of the following best illustrates the law of conservation of mass in a real-world scenario?

Accepted Answer

A piece of iron rusts and the total mass of the iron and oxygen used equals the mass of rust formed.

Question 12

Which of the following is a chemical property of sodium?

Accepted Answer

It reacts vigorously with water.

Question 13

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Oil and water

Question 14

Which of the following statements about compounds is correct?

Accepted Answer

Compounds have properties different from their constituent elements.

Question 15

A student claims that when wood burns, the mass of the ash is less than the original wood, so mass is not conserved. What is the best explanation for this observation?

Accepted Answer

Some of the mass is released as gases such as $$CO_2$$ and $$H_2O$$ vapor.

Fundamental Concepts in General Chemistry

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