Question 1

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

Accepted Answer

Reactivity of sodium with water

Question 2

A sample of air is best classified as which of the following?

Accepted Answer

Homogeneous mixture

Question 3

Which statement best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 4

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand in water

Question 5

A student measures the boiling point of ethanol. Which type of property is being measured, and why?

Accepted Answer

Physical property, because the composition of ethanol does not change

Question 6

Which of the following best describes a compound?

Accepted Answer

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

Question 7

During a chemical reaction, 10 g of hydrogen reacts with 80 g of oxygen to form water. According to the Law of Conservation of Mass, what is the mass of water formed?

Accepted Answer

90 g

Question 8

Which of the following is NOT a pure substance?

Accepted Answer

Milk

Question 9

A chemist observes that iron rusts when exposed to air. This observation is best classified as:

Accepted Answer

A chemical property

Question 10

Which scenario best illustrates the Law of Conservation of Mass in a real-world context?

Accepted Answer

A sealed container of hydrogen and oxygen forms water, and the total mass remains unchanged.

Question 11

Which of the following statements is true regarding mixtures?

Accepted Answer

The components of a mixture retain their individual identities.

Question 12

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

Accepted Answer

Salt water

Question 13

A student claims that the mass of products in a chemical reaction is less than the mass of reactants because some mass is 'used up.' Which law contradicts this claim?

Accepted Answer

Law of Conservation of Mass

Question 14

Which of the following best distinguishes an element from a compound?

Accepted Answer

Elements consist of only one type of atom, while compounds contain two or more types of atoms chemically combined.

Question 15

A sample contains iron filings and sulfur powder. After mixing, the sample is heated and a new substance forms. Which statement is correct?

Accepted Answer

A compound has formed due to a chemical reaction.

Question 16

Which of the following is a correct example of a physical change?

Accepted Answer

Dissolving sugar in water

Some Basic Concepts of Chemistry: Properties, Classification of Matter, and Laws of Chemical Combination

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