Chapt. 2.4

Question 1

endothermic reaction

Answer 1

chemical reaction that absorbs more energy than it releases

Question 2

exothermic reaction

Answer 2

chemical reaction that releases more energy than it absorbs

Question 3

activation energy

Answer 3

amount of energy that need to be absorbed for a chemical reaction to start

Question 4

reactants

Answer 4

substance changed during a chemical reaction

Question 5

products

Answer 5

substance made by a chemical reaction

Question 6

equilibrium

Answer 6

state reached when reactions and products are made at the same rate

Question 7

bond energy

Answer 7

the amount of energy that is needed to break a bond between two atoms

Question 8

(T or F) Not all chemical reactions involve changes in energy

Answer 8

false

Question 9

(T or F) Activation energy is required for a chemical reaction to start.

Answer 9

true

Question 10

(T or F) Some chemical reactions release more energy than they absorb, while others absorb more energy than they release.

Answer 10

true

Question 11

(T or F) Chemical reactions can occur whether or not energy is added to reactants.

Answer 11

false

Question 12

(T or F) An exothermic chemical reaction absorbs more energy than it releases.

Answer 12

false

Question 13

During a chemical reaction, (chemical bonds/ solutes) break and reform.

Answer 13

chemical bonds

Question 14

(Reactants/ products) are the substances changed during a chemical reaction.

Answer 14

reactants

Question 15

Bond energy is the amount of energy it takes to break a bond between 2 (atoms/ ions).

Answer 15

atoms

Question 16

Equilibrium occurs when reactions and products are made at (the same/ different) rates.

Answer 16

the same

Question 17

chemical reaction

Answer 17

change in substances into different substances by breaking and forming bonds