Science test 12/4

Question 1

a number placed in front of element symbol or chemical formula in an equation

Answer 1

coefficient

Question 2

substance in a chemical reaction

Answer 2

reactant

Question 3

substance that slows down or stops a chemical reaction

Answer 3

inhibitor

Question 4

lowers the activation energy of a reaction and increaes the reaction rate

Answer 4

catalyst

Question 5

reaction that occurs when a substance combineswith oxygen and releases energy

Answer 5

combustion

Question 6

require activation energy to get started

Answer 6

endotheric/exothermic reaction

Question 7

what would cause a reaction to occur more quickly

Answer 7

increasing the surface area of a solid reactant

Question 8

When chemical bonds in the reactant are broken energy is absorbed during which type of reaction

Answer 8

both exothermic and endothermic reactions

Question 9

cannot be formed during a chemical reaction

Answer 9

atoms

Question 10

In a reaction that has one reactant and two products the mass?

Answer 10

mass of the products is equal to the mass of the reactants

Question 11

A single-replacement reaction has

Answer 11

two reactants and two products