Exploring Chemistry Chapters 9-12

Question 1

Timbuktu is located at the edge of the _______________ Desert.

Answer 1

Sahara

Question 2

Has anyone ever succeeded in making organic material in a laboratory?

Answer 2

yes

Question 3

A diagram of a water molecule shows it as

Answer 3

an oxygen atom face with hydrogen atom ears

Question 4

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

Answer 4

slowly

Question 5

Sodium and chlorine families form compounds by

Answer 5

electrical attraction

Question 6

Sugar is an example of a compound that is ___.

Answer 6

formed by living organisms

Question 7

Snow conducts heat ___.

Answer 7

poorly

Question 8

Paraffin is an example of a ___ hydrocarbon chain.

Answer 8

long

Question 9

Water boils at

Answer 9

100^oC [212^oF]

Question 10

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

Answer 10

attract one another

Question 11

Ice ___ in water

Answer 11

floats

Question 12

The Nile River continues to flow through deserts because

Answer 12

it is fed by melting snow in the mountains

Question 13

A hydrocarbon is a compound that contains only carbon and

Answer 13

hydrogen

Question 14

___ is used for refrigeration.

Answer 14

Freon

Question 15

When Leo Baekeland mixed carbolic acid and formaldehyde, the result was

Answer 15

a substance that clogged test tubes

Question 16

Ethyl alcohol and dimethyl ether are examples of

Answer 16

isomers

Question 17

___ is the most common liquid on earth.

Answer 17

Water

Question 18

Does an evaporated liquid warm its surroundings?

Answer 18

no

Question 19

Does salt have any purpose other than flavoring food?

Answer 19

yes

Question 20

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

Answer 20

Tyre

Question 21

Methane is also known as what kind of gas?

Answer 21

marsh

Question 22

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

Answer 22

four

Question 23

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

Answer 23

ozone layer

Question 24

Another name for the chlorine family is

Answer 24

salt makers

Question 25

The number of chlorine atoms in carbon tetrachloride is \_\_\_.

Answer 25

four

Question 26

When burned with oxygen, natural gas releases carbon dioxide and

Answer 26

water.

Question 27

Leo Baekeland discovered the substance he called Bakelite while trying to make a substitute for

Answer 27

shellac

Question 28

Does methane or water boil at a higher temperature?

Answer 28

water

Question 29

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

Answer 29

no

Question 30

Bakelite was the first plastic and was immediately replaced by better ones. Did that prove to be a disappointing failure to Leo Baekeland.

Answer 30

no

Question 31

Teflon is \_\_\_.

Answer 31

slick

Question 32

Salt is an example of a compound that is \_\_\_\_.

Answer 32

found in the non-living environment

Question 33

Did William Henry Perkin retire after success in his research?

Answer 33

no

Question 34

Chlorinating drinking water was first tried in London in 1897 to

Answer 34

top an outbreak of typhoid fever

Question 35

Oxygen and hydrogen form the water molecule by ___ electrons.

Answer 35

sharing

Question 36

Do chemical reactions follow a different set of rules in living things than they do in the laboratory?

Answer 36

no

Question 37

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

Answer 37

has more protons than electrons

Question 38

The elements found in organic compounds include hydrogen, oxygen, nitrogen, and \_\_\_.

Answer 38

carbon

Question 39

\_\_\_ is burned as a fuel in racing engines.

Answer 39

Methanol

Question 40

Liquid water ___ when it changes into ice.

Answer 40

contracts