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