Thermo

Question 1

What is the original source of energy

Answer 1

Sunlight

Question 2

Is photosynthesis endo/exothermic

Answer 2

Endothermic

Question 3

Is cell resp endo/exothermic

Answer 3

Exothermic

Question 4

Formula for photosynthesis:

Answer 4

6h20 (l) +6co2(g) + energy -> 6o2 (g) +C6H12O6 (s)

Question 5

Formula for cell resp:

Answer 5

C6H12O6 +6O2 (g) ->6CO2 +6H2O (l) +energy

Question 6

What state is water after :
Cell resp
Burning of glucose

Answer 6

(L)
(G)

Question 7

Define an
Open system:
Closed system:
Isolated system:

Answer 7

• matter AND energy can enter and leave the system
• energy can enter and leave but matter can’t
• neither matter/energy can enter or exit the system

Question 8

First law of thermodynamics

Answer 8

Energy cannot be created or destroyed only transformed OR total energy in the universe is constant

Question 9

Second law of thermodynamics

Answer 9

Thermal energy is transferred from objects of higher temp to objects of lower temp

Question 10

Kinetic energy=

Answer 10

Motion of particles

Question 11

Potential energy is stored in _____ bonds

Answer 11

Chemical

Question 12

If Q is (-) then the reaction is ____

Answer 12

Exothermic

Question 13

If Q is (+) the reaction is ____

Answer 13

Endothermic

Question 14

If you have a solution with no given heat capacity what do you assume

Answer 14

That it has the properties of water

Question 15

In endothermic reactions new bonds store ____ potential energy than the ____ ______

Answer 15

More
Original reactants

Question 16

In exothermic reactions new bonds store _____ P.E than the ____ _____

Answer 16

Less
Original reactants

Question 17

Define enthalpy change

Answer 17

The change in potential energy between products and reactants

Question 18

Define molar enthalpy change

Answer 18

The change when one mole of a substance undergoes a reaction (KJ/mol)

Question 19

What is a true example of an isolated system

Answer 19

Bomb calorimetry

Question 20

Substances with _____ potential energy are ____ stable compared to substances with _____ potential energy

Answer 20

Lower
More
Higher

Question 21

Energy efficiency formula:

Answer 21

Useful energy output/total energy input x100
Or
Experimental output/theoretical input x100

Question 22

What is collision theory

Answer 22

For a chemical reaction to occur particles must collide and collisions must be effective

Question 23

In order for collisions to be considered effective what 2 things have to be met

Answer 23

1) collision geometry (particles must have the correct orientation @ impact)
2) activation energy (particles must have enough collision energy)

Question 24

Activation energy=

Answer 24

The max amount of energy to get a reaction to occur

Question 25

Formula for EA reverse

Answer 25

Ea rev= Ea for + Change in enthalpy

Question 26

What do catalysts do in a reaction

Answer 26

They rovide an alternate pathway for a reaction to take place. The alternate pathway has a Lower Ea so the reaction is faster

Question 27

Heterogenous catalyst=

Answer 27

Catalyst that’s in a different state then the reactants

Question 28

Homogenous catalyst=

Answer 28

Catalyst in the same state as the reactants

Question 29

What are considered biological catalysts and what temp do they act at

Answer 29

Enzymes 37c