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Worksheetsscience unit 1 practice
Total questions: 10
Worksheet time: 5mins
an exothermic reaction is when the reaction...
makes bubbles
releases heat
takes in heat
does nothing
an endothermic reaction is when the reaction ...
takes in heat
turns purple
explodes
gives out heat
4Fe + 3O2 ------}
nothing
Fe2O3
2 Fe2O3
2 Fe4O7
what does the law of the conservation of mass state
that you can destroy or create mass
something
that you can't destroy or create mass
I don't know
what is the chemical formula for water
H2O
O2H
water
H2O2
what is not a chemical change
A change in PH
the production of mass
flammability
melting/freezing
how do you classify a physical change
it can't go back to the original state
it's not hot
it can go back to the original state
it turns into a mutated monster
if a substance dissolves in water is it a chemical change
true
false
maybe
what is not in a atom
neutron
electron
water
protron
what is the part of the atom that holds the electrons
the nucleus
the thing that holds the electron
a chicken
the shell
