Energy Related to Reactions

Question 1

the most common unit for energy is

Answer 1

joule (or kilojoule).

Question 2

The heat of reaction

Answer 2

the energy that is released or absorbed when chemicals are transformed in a chemical reaction

Question 3

The quantity of heat of reaction depends on :

Answer 3

the reactants and the products formed

Question 4

Chemical reactions that release energy are called

Answer 4

exothermic

Question 5

Chemical reactions that require energy to proceed are
called

Answer 5

endothermic

Question 6

Energy released during a chemical reaction comes from chemical _____ between atoms.

Answer 6

bonds

Question 7

In an exothermic reaction, the bonds in the reactants contain ____ energy than the bonds in the products.

Answer 7

more

Question 8

In an endothermic reaction, the bonds in the reactants contain ____ energy that the bonds in the products.

Answer 8

less

Question 9

In an exothermic reaction does the temperature go up or down?

Answer 9

The temperature will increase

Question 10

In an endothermic reaction does the temperature go up or down?

Answer 10

The temperature will decrease

Question 11

In an exothermic reaction, is enthalpy change positive or negative?

Answer 11

negative

Question 12

In an endothermic reaction, is enthalpy change positive or negative?

Answer 12

positive

Question 13

The bonds between the atoms of _______ need to be broken first, this
is an ________ process.
Theme bonds are made between the atoms
of the ________ this is an __________

Answer 13

1-product
2-exothermic
3-reactant
4-endothermic