Question 1

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

Accepted Answer

An element is a substance that cannot be broken down into other substances by chemical reactions, while a compound consists of two or more elements in a fixed ratio.

Question 2

Which statement correctly explains why the laws of chemistry apply to both living and nonliving matter?

Accepted Answer

Because both living and nonliving matter are composed of matter, which follows the same chemical laws.

Question 3

A scientist combines sodium (Na) and chlorine (Cl) in a laboratory. Which statement best describes the result of this chemical reaction?

Accepted Answer

The resulting compound, sodium chloride (NaCl), will have characteristics different from those of sodium and chlorine.

Question 4

Which of the following is NOT a property of matter?

Accepted Answer

It can be created or destroyed in a chemical reaction.

Question 5

If a substance consists of two or more elements in a fixed ratio, what is it called?

Accepted Answer

A compound

Question 6

Why is it important for biologists to understand the chemical context of life?

Accepted Answer

Because understanding the building blocks of matter helps explain the properties and functions of biological structures.

Question 7

Which of the following best illustrates the concept that compounds have characteristics different from their constituent elements?

Accepted Answer

Oxygen gas and hydrogen gas combine to form water, which is a liquid at room temperature.

Question 8

Which of the following is an example of matter?

Accepted Answer

Air

Question 9

A student claims that a compound can be separated into its elements by physical means. Is this statement correct?

Accepted Answer

No, compounds can only be separated into elements by chemical reactions.

Question 10

Which equation correctly represents the formation of sodium chloride from its elements?

Accepted Answer

$\mathrm{Na} + \mathrm{Cl}_2 \rightarrow \mathrm{NaCl}$

Question 11

Which of the following statements about elements is TRUE?

Accepted Answer

Elements are substances that cannot be broken down into other substances by chemical reactions.

Question 12

Which property distinguishes a compound from a mixture?

Accepted Answer

A compound has a fixed ratio of elements, while a mixture does not.

Question 13

Which of the following is a direct consequence of the chemical laws governing both living and nonliving matter?

Accepted Answer

The same types of chemical reactions can occur in both living and nonliving systems.

Question 14

A biologist wants to understand the function of a protein. Why is knowledge of chemistry important in this context?

Accepted Answer

Because proteins are composed of matter and their structure is determined by chemical interactions.

Question 15

Which of the following is NOT a characteristic of a compound?

Accepted Answer

It can be separated into its elements by physical means.

Question 16

Which of the following best describes the relationship between matter and living organisms?

Accepted Answer

Living organisms are composed of matter, which follows the same chemical laws as nonliving matter.

Question 17

Which of the following is an example of a chemical reaction resulting in a compound with new properties?

Accepted Answer

Combining hydrogen and oxygen to form water ($2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2\mathrm{H}_2\mathrm{O}$)

Question 18

Which of the following statements is FALSE regarding compounds?

Accepted Answer

Compounds can be separated into their elements by physical means.

Question 19

Which of the following is a correct definition of matter?

Accepted Answer

Anything that takes up space and has mass.

Question 20

Which of the following is a real-world example of a compound with properties different from its elements?

Accepted Answer

Table salt ($\mathrm{NaCl}$) formed from sodium (a reactive metal) and chlorine (a poisonous gas).

Chapter 2: Chemical Context of Life – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards