Exploring Chemistry Chapters 9-10

Question 1

Another name for the chlorine family is

Answer 1

salt makers

Question 2

Does salt have any purpose other than flavoring food?

Answer 2

yes

Question 3

Sodium and chlorine families form compounds by

Answer 3

electrical attraction

Question 4

Liquid water ___ when it changes into ice.

Answer 4

contracts

Question 5

The Nile River continues to flow through deserts because

Answer 5

it is fed by melting snow in the mountains

Question 6

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

Answer 6

attract one another

Question 7

Timbuktu is located at the edge of the _______________ Desert.

Answer 7

Sahara

Question 8

Snow conducts heat ___.

Answer 8

poorly

Question 9

Chlorinating drinking water was first tried in London in 1897 to

Answer 9

top an outbreak of typhoid fever

Question 10

Water boils at

Answer 10

100^oC [212^oF]

Question 11

Oxygen and hydrogen form the water molecule by ___ electrons.

Answer 11

sharing

Question 12

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

Answer 12

no

Question 13

A diagram of a water molecule shows it as

Answer 13

an oxygen atom face with hydrogen atom ears

Question 14

Ice ___ in water

Answer 14

floats

Question 15

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

Answer 15

slowly

Question 16

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

Answer 16

has more protons than electrons

Question 17

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

Answer 17

Tyre

Question 18

Does methane or water boil at a higher temperature?

Answer 18

water

Question 19

___ is the most common liquid on earth.

Answer 19

Water