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This is the type of reaction that during a reaction thermal energy is absorbed.
endothermic reaction
This is something that speeds up a chemical reaction but does not change itself.
catalyst
This slows down a chemical reaction.
inhibitor
This is certain proof that a chemical reaction has occurred.
change of chemical properties
Which will burn fastest in open air, a log 2 feet in diameter, or a pile of splinters made from a 2 foot diameter log?
pile of splinters made from a 2 foot diameter log
If the arrangement of atoms in a substance changes, chemical properties are the same but physical properties change.
false
Nate observed an experiment where 1 substance produced 2 substances. What type of a reaction is this?
decomposition
An experiment has 1 element and 1 compound and ends up with a different element and a different compound. What type of reaction is this?
single replacement
Brennan watched as 2 compounds reacted and changed into 2 different compounds. What type of reaction is this?
double replacement
2 atoms of calcium can react to create 6 atoms of calcium.
false
Chemical reactions are balanced by changing the subscripts of the molecules.
false
All chemical reactions occur at the same rate.
false
This is the minimum amount of energy needed for a chemical reaction to occur.
activation energy
Energy is needed to break the bonds in a chemical reaction.
true
Atoms are not ____ during a chemical reaction according to the law of conservation of mass.
created or destroyed
During a combustion reaction, what element must be part of the reactant?
oxygen (O2)
