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What does the law of conservation of mass mean
mass increases during changes
mass disappears during changes
mass only applies to solids
mass stays the same during changes
What is a product in a chemical reaction
the starting material
the gas that forms
the substance made after the reaction
the heat released
What is a reactant
the substance that is changed in a reaction
a type of energy
a type of atom
the final substance created
What is density
how shiny something is
how hot something is
how fast an object moves
how much mass is in a given volume
What is volume
the heaviness of an object
the speed of particles
the number of atoms in an object
the amount of space something takes up
What does reactivity describe
how smooth something feels
how flexible something is
how well something floats
how easily something reacts with oxygen or water
What does oxidation often involve
a reaction with oxygen
a decrease in temperature
a change from liquid to solid
the formation of a physical change only
What is a coefficient in chemistry
the number showing how many molecules are present
the number of electrons in an atom
the total mass in the reaction
the temperature needed for a reaction
What is flammability
how easily something dissolves
how easily something lights on fire
how flexible something is
how much space it fills
What makes something a chemical property
it describes temperature only
it describes color only
it describes the ability to undergo a chemical change
it describes size and shape
What is a chemical reaction
when something changes shape only
when something freezes
when substances change into new substances
when something melts
What happens in a chemical change
the substance stays the same
new substances form
only the size changes
only the temperature changes
Which is an example of a physical property
reactivity
flammability
texture
toxicity
Which is a sign of a chemical change
formation of a gas
freezing
breaking into pieces
melting
What happens to atoms during a reaction
they multiply
they shrink
they rearrange
they disappear
Name a sign of chemical change
formation of gas
