Exploring Chemistry Chapters 9-11

Question 1

A diagram of a water molecule shows it as

Answer 1

an oxygen atom face with hydrogen atom ears

Question 2

William Bently made __ money from his hobby of photographing snowflakes.

Answer 2

no

Question 3

Liquid water ___ when it changes into ice.

Answer 3

contracts

Question 4

Another name for the chlorine family is

Answer 4

salt makers

Question 5

The number of chlorine atoms in carbon tetrachloride is ___.

Answer 5

four

Question 6

Paraffin is an example of a ___ hydrocarbon chain.

Answer 6

long

Question 7

Does an evaporated liquid warm its surroundings?

Answer 7

no

Question 8

The purple dye containing bromine was prepared by Phoenicians who lived in the city of _______________.

Answer 8

Tyre

Question 9

The _____ reduces the effect of harmful ultraviolet rays from the sun.

Answer 9

ozone layer

Question 10

Sodium and chlorine families form compounds by

Answer 10

electrical attraction

Question 11

___ is burned as a fuel in racing engines.

Answer 11

Methanol

Question 12

___ is the most common liquid on earth.

Answer 12

Water

Question 13

Methane is also known as what kind of gas?

Answer 13

marsh

Question 14

___ is used for refrigeration.

Answer 14

Freon

Question 15

Does methane or water boil at a higher temperature?

Answer 15

water

Question 16

In cool water, molecules move more ___ than in warm water.

Answer 16

slowly

Question 17

Chlorinating drinking water was first tried in London in 1897 to

Answer 17

top an outbreak of typhoid fever

Question 18

The Nile River continues to flow through deserts because

Answer 18

it is fed by melting snow in the mountains

Question 19

Does salt have any purpose other than flavoring food?

Answer 19

yes

Question 20

Teflon is ___.

Answer 20

slick

Question 21

The plus sign, +, for the charged sodium atom, Na+, shows that it

Answer 21

has more protons than electrons

Question 22

Timbuktu is located at the edge of the _______________ Desert.

Answer 22

Sahara

Question 23

When burned with oxygen, natural gas releases carbon dioxide and

Answer 23

water.

Question 24

Carbon needs _______________ more electrons to have its electrons in the stable arrangement like the electrons of neon.

Answer 24

four

Question 25

Ethyl alcohol and dimethyl ether are examples of

Answer 25

isomers

Question 26

Snow conducts heat ___.

Answer 26

poorly

Question 27

Oxygen and hydrogen form the water molecule by ___ electrons.

Answer 27

sharing

Question 28

The charged sodium atom, Na+, and the charged chlorine atom, Cl-, will

Answer 28

attract one another

Question 29

Water boils at

Answer 29

100^oC [212^oF]

Question 30

Ice ___ in water

Answer 30

floats

Question 31

A hydrocarbon is a compound that contains only carbon and

Answer 31

hydrogen