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. Which classification of matter best describes the resulting mixture?

Accepted Answer

Heterogeneous mixture

Question 3

Which statement best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants and products remains unchanged during a chemical reaction.

Question 4

Which of the following is a chemical property?

Accepted Answer

Ability to react with acid

Question 5

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements chemically combined in a fixed ratio

Question 6

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 7

A sample of seawater is best classified as which type of matter?

Accepted Answer

Homogeneous mixture

Question 8

Which of the following changes is a chemical change?

Accepted Answer

Burning of wood

Question 9

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

Accepted Answer

$$90\ \mathrm{g}$$

Question 10

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 11

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

Accepted Answer

Salad

Question 12

Which of the following statements is true about elements?

Accepted Answer

Elements are pure substances consisting of only one type of atom.

Question 13

A student observes that when iron reacts with oxygen, rust is formed and the total mass of the system remains unchanged. This observation supports which law?

Accepted Answer

Law of Conservation of Mass

Question 14

Which of the following is NOT a chemical property?

Accepted Answer

Melting point

Question 15

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is formed by chemical combination of elements, while a mixture is formed by physical combination of substances.

Question 16

Which of the following is a correct application of the Law of Conservation of Mass in a real-world scenario?

Accepted Answer

When sugar dissolves in water, the total mass of the solution is equal to the sum of the masses of sugar and water.

Fundamental Concepts in General Chemistry

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