Chemistry

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pounds/square inch

kilograms/square meter

milligrams/square centimeter

grams/milliliter

Slide 24

Based on the melting points shown in the table, which material would still be a solid at 400°C?

beeswax

gold

lead

oxygen

Substance Melting Point (°C)

Beeswax 62

gold 1,063

lead 327

oxygen –218

Slide 25

A chemical change for a piece of metal would be

being bent in half.

getting cut into two pieces.

being painted.

getting rusty.

Slide 26

Which symbolizes a molecule of a compound?

He

Be

N2

NaCl

Slide 27

Putting sand and salt together makes

a compound.

an element.

a mixture.

a solution.

Slide 28

Plastic, wood, and iron are all made up of

cells.

atoms.

carbon.

plants.

Slide 29

Water is

a compound.

an element.

a solution.

a mixture.

Slide 30

An atom is to an element, as a molecule is to a

metal.

nonmetal.

metalloid.

compound.

Slide 31

In 1982, the composition of US pennies was changed. According to the information in the table, 1985 pennies

are more dense than 1981 pennies.

are less dense than 1981 pennies.

are equal in density to 1981 pennies.

cannot be compared to 1981 pennies

Slide 32

All of the substances on the periodic table are classified as elements because they

are pure substances. are composed of atoms. cannot be broken down into other substances. cannot be dissolved in water or other liquids.

Slide 33

Salt (NaCl) is a common substance. Salt is which of these?

atom

element

compound

mixture

Slide 34

Each element is assigned an atomic number, which is the same as

the number of electrons in the atom's nucleus.

the number of protons in the atom's nucleus.

the number of neutrons in the atom's nucleus.

the number of protons and neutrons in the atom's nucleus

Slide 35