Question 1

Which of the following best defines 'matter' as described in the study materials?

Accepted Answer

Anything that has mass and occupies space.

Question 2

Which of the following is NOT one of the three states in which matter is commonly found?

Accepted Answer

Plasma

Question 3

A compound differs from an element in that a compound:

Accepted Answer

Consists of two or more different elements combined in a fixed ratio.

Question 4

Which statement about trace elements is correct?

Accepted Answer

They are required in extremely small amounts but are essential to life.

Question 5

Most compounds in living organisms contain at least how many different elements?

Accepted Answer

Three or four

Question 6

Which of the following is an example of a compound?

Accepted Answer

Water ($\mathrm{H_2O}$)

Question 7

If a substance is made of only one kind of atom, it is classified as:

Accepted Answer

An element

Question 8

Which of the following best explains why trace elements are important in biology?

Accepted Answer

They are required for vital processes even though only small amounts are needed.

Question 9

Which of the following statements is true regarding the elements required by humans and plants?

Accepted Answer

Humans require 25 elements, while plants require only 17.

Question 10

A scientist discovers a new substance that cannot be broken down into simpler substances by chemical means. According to your notes, this substance is most likely:

Accepted Answer

An element

Question 11

Which of the following best describes the relationship between elements and compounds?

Accepted Answer

Compounds are made of two or more different elements combined in a fixed ratio.

Question 12

Which of the following is a property of a compound that distinguishes it from its constituent elements?

Accepted Answer

A compound has characteristics different from those of its elements.

Question 13

Which of the following is NOT a trace element required by humans?

Accepted Answer

Oxygen

Question 14

A student mixes two elements together and observes that the resulting substance has properties different from either element. What has the student most likely created?

Accepted Answer

A compound

Question 15

Which of the following best describes the composition of most biological molecules?

Accepted Answer

They contain at least three or four different elements.

Question 16

Which of the following is a real-life example of the importance of trace elements?

Accepted Answer

A deficiency in iodine can lead to thyroid problems in humans.

Question 17

Which of the following statements about elements is correct?

Accepted Answer

An element is a substance that cannot be broken down into other substances by chemical means.

Question 18

If a compound is made from elements A and B in a fixed ratio of 2:1, which of the following chemical formulas could represent this compound?

Accepted Answer

$A_2B$

Question 19

Which of the following best explains why water ($\mathrm{H_2O}$) is considered a compound and not an element?

Accepted Answer

It consists of two different elements, hydrogen and oxygen, combined in a fixed ratio.

Question 20

Which of the following is a correct statement about the elements found in the human body?

Accepted Answer

About 25 elements are required for human life, but only a few make up the majority of body mass.

Introduction to Matter, Elements, and Compounds (Bio Notes 2.1)

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