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