Physical science final

which of the following requires friction

all of the above

All matter is made up of atoms and molecules that are

always in motion

a chemical equation is balanced by changing or adding

coefficients

A gas becomes a liquid through a process called

condensation

Unlike a gas, a plasma

conducts electric current

Avogadro's number is useful for

counting atoms

Democritus's original atomic theory was revised because it

did not have a scientific basis.

Scientists test a hypothesis by

doing experiments

oxygen's atomic number is 8. this means that an oxygen atom has

eight protons in it's nucleus

A particle that moves around the nucleus is a(n) ____.

electron

a subatomic particle that has a negative charge is called a(n)

electron

most elements are

metals

the substance that is formed in a chemical reaction is called

product

what is an atom's nucleus made of

protons and neutrons

What is Mendeleev known for?

publishing the first periodic table

O2 would be considered a(n)

reactant

which state of matter will hold its shape without a container

solid

A tug-of-war that results in one team pulling the other across the line is an example of

unbalanced forces

Evaporation refers to the change of state from a

Liquid to gas

which of these properties is shared by solids, liquids, and gases?

Particles are in constant motion

if the atomic mass or carbon is 12, 1 mole of pure carbon is will have a mass of

12 g

the temperature at which a substance changes from a liquid to a solid is

freezing point

Using lubricants on engine parts is an example of reducing

friction

each column of the periodic table is

group

Atoms have no electric charge because they

have an equal number of electrons and protons

the speed you read on a speedometer is

instantaneous speed

which state of matter has a definite volume, but not a definite shape?

liquid

The first step in the scientific method is usually

making an observation

Inertia varies depending on

mass

Two different isotopes of an element have different

numbers of neutrons

The horizontal rows on the periodic table are called

periods

the most common state of matter in the universe is

plasma

Motion is a change in ____.

position