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