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