Chapter 0 Introduction to Chemistry

Question 1

Chemistry

Answer 1

The science that seeks to understand what matter does by studying what atoms do

Question 2

Matter

Answer 2

Anything that occupies space and has mass

Question 3

Atoms

Answer 3

Atoms are the smallest units of matter that retain the properties of an element.

Question 4

Elements

Answer 4

Types of atoms. Atoms of every element have unique physical and chemical properties that
distinguish them from other elements

Question 5

Compound

Answer 5

Two or more atoms joined together by chemical bonds

Question 6

Solid

Answer 6

Matter with a fixed shape and fixed volume. In solids, atoms or molecules pack close together in
fixed locations

Question 7

Liquid

Answer 7

Matter with a fixed volume, but no fixed shape. In liquids, atoms or molecules pack close
together, but are free to move past each other

Question 8

Gas

Answer 8

Matter with no fixed shape or volume. In gases, there is a lot of space in between atoms or
molecules and they are free to move past each other.

Question 9

Element

Answer 9

A pure substance that is composed of only one type of atom

Question 10

Compounds(pure substance)

Answer 10

A pure substance that is composed of two or more types of atoms

Question 11

Pure Substance

Answer 11

Matter that is composed of only one type of atom or molecule

Question 12

Mixture

Answer 12

Matter that is composed of two or more types of atoms or molecules.

Question 13

Homogeneous mixture

Answer 13

A mixture with an even composition throughout

Question 14

Heterogeneous mixture

Answer 14

A mixture with a composition that varies from one region to another.

Question 15

Aqueous Solution

Answer 15

A homogeneous mixture of a substance dissolved in water

Question 16

The Scientific Method

Answer 16

way of learning that emphasizes observation and experimentation

Question 17

Observations

Answer 17

Measurements or descriptions of the physical world

Question 18

Hypotheses

Answer 18

Explanations or interpretations of observations that can be tested by further
experimentation

Question 19

Experiments

Answer 19

Procedures designed to test hypotheses, theories, and scientific laws

Question 20

Scientific Laws

Answer 20

Statements that summarize past observations and predict future events

Question 21

Theories

Answer 21

Models that provide a broader and deeper explanation of observations and laws

Question 22

True or False: The properties of compounds are the same as the properties of their constituent elements.

Answer 22

false

Question 23

What is the difference between an aqueous solution and a liquid?

Answer 23

AQ:A mixture of water and another
substance
L:Pure substance in the liquid state

Question 24

What is the difference between a law and a theory

Answer 24

A law only describes what is happening, whereas a theory provides a model to explain why something is
happening.

Question 25

What is the difference between a hypothesis and a theory?

Answer 25

A hypothesis is an explanation or interpretation of a specific observation, and must be tested by
experimentation. Theories are more broad and are supported by experimental evidence.