chapter 1

Question 1

chemistry is

Answer 1

the study of composition, structure, and properties of matter and the changes that matter undergoes

Question 2

a chemical is

Answer 2

any substance that has a definite composition or is used or produced in a chemical process

Question 3

basic research is carried out for the sake

Answer 3

of increasing knowledge

Question 4

applied research is carried out to

Answer 4

solve practical problems.

Question 5

technological development involves

Answer 5

the use of existing knowledge to make life easier or more convenient.

Question 6

all matter has

Answer 6

mass and takes up space

Question 7

mass is one

Answer 7

measure of the amount of matter

Question 8

chemical properties refer to

Answer 8

a substance’s ability to undergo changes that alter its composition and identity

Question 9

an element is

Answer 9

composed of one kind of atom.

Question 10

Compounds are made

Answer 10

from two or more elements in fixed proportions

Question 11

all substances have

Answer 11

characteristic properties that enable chemists to tell the substances apart and to separate the substances.

Question 12

physical changes do

Answer 12

not involve changes in identity of a substance

Question 13

the three major states of matter are

Answer 13

solid, liquid, and gas.

Question 14

physical changes include

Answer 14

changes of state, such as melting and boiling

Question 15

in a chemical change

Answer 15

the identity of the substance changes

Question 16

energy may be

Answer 16

released or absorbed

Question 17

energy can not be

Answer 17

created or destroyed

Question 18

matter can be

Answer 18

classified into mixtures and pure substances

Question 19

groups and families run

Answer 19

up and down

Question 20

periods and rows run

Answer 20

side to side

Question 21

elements can be classified as

Answer 21

metals, nonmetals, metalloids, and noble gases

Question 22

metals tend to be

Answer 22

shiny, malleable, ductile, and tend to be good conductors.

Question 23

nonmetals tend to be

Answer 23

brittle and tend to be poor conductors.

Question 24

the noble gases are

Answer 24

unreactive elements.

Question 25

metalloids are

Answer 25

intermediate in properties between metals and nonmetals. tend to be semi conductors of electricity.