Chemical Reactions Review

Question 1

chemical change

Answer 1

a change in which new products are formed

Question 2

physical change

Answer 2

a change in which no new products are formed

Question 3

nuclear change

Answer 3

a type of change that produces radioactive compounds

Question 4

reactants

Answer 4

on the left side, present at start of reaction

Question 5

products

Answer 5

substance produced in a chemical reaction

Question 6

yield sign

Answer 6

“➡️”

Question 7

law of conservation mass

Answer 7

In any physical change or chemical reaction, mass is conserved; mass can neither be created nor destroyed

Question 8

direct combination

Answer 8

synthesis reaction- two atoms combine as one

Question 9

decomposition

Answer 9

a compound breaks up into its components

Question 10

single replacement

Answer 10

more active metal replaces the less active metal

Question 11

double replacement

Answer 11

compounds exchange partners

Question 12

combustion

Answer 12

“burning” uses 02 to produce CO2 + H2O

Question 13

Catalyst

Answer 13

also known as enzyme. reduces the activation energy. makes the reaction go faster

Question 14

precipitate

Answer 14

a solid that forms and settles out of a liquid mixture

Question 15

exothermic

Answer 15

a process that releases heat to its surrounding

Question 16

endothermic

Answer 16

a process that absorbs heat from its surroundings

Question 17

chemical reaction

Answer 17

another way of saying “chemical change”