test for science of physical and chemical change Flashcards
begins and ends with the same type of matter
physical change
begins with one kind of matter and ends with another
chemical change
a change of state is what
physical change
when energy added to particles
they move faster
when energy is lost to particles
they move slower
when enough energy is gained or lost
there is a change of state
melting occurs when a solid becomes a liquid because
the particles move quickly past each other
when gas loses heat and becomes a liquid
condensation
when the particles condense and freeze
they become closer
when particles melt and evaporate
the particles become further apart
name 6 examples of physical changes
ex. ice melting, water boiling, water evaporating, painting a wall, getting a haircut, cutting paper
chemical change create ____ substances
new
the five signs of chemical change are
change in color, change in odor, energy change, the formation of a gas, formation of a precipitate( a solid)
the law of conservation of mass states
that all atoms present before a reaction will be present after the reactions end. the total mass of reactants= total mass of products
which way do you read a chemical equation
either
what do the chemical name indicates what
what elements make up that compound
chemical on the left side of the equation is
reactants
chemical on the right side of the equation is
products
why do scientists wright chemical equations
to keep track of what elements are used in what ratio
what is the grade I should get
100%
