Thermochemistry

Question 1

Do endothermic processes have a positive or negative q?

Answer 1

positive

Question 2

Do exothermic processes have a positive or negative q?

Answer 2

negative

Question 3

If a problem says that energy is evolved, is the enthalpy positive or negative?

Answer 3

negative

Question 4

How to find the heat from the heat capacity (C)?

Answer 4

q=CxΔt

Question 5

How to find the heat from the specific heat capacity (c)?

Answer 5

q=mcΔt

Question 6

What is the coffee-cup calorimetry equation?

Answer 6

-qrxn= m(water) x 4.18 J/gC x Δt

Question 7

What is the bomb calorimetry equation?

Answer 7

-qrxn= m(water) x 4.18 J/gC x Δt + C(Calorimeter)Δt

Question 8

How to calculate the enthalpy of formation?

Answer 8

ΔH= the sum of the ΔH of products - the sum of the ΔH of reactants

Question 9

What are the units for enthalpy?

Answer 9

kJ/mole

Question 10

What are the units for heat capacity?

Answer 10

J/°C

Question 11

When heat flows from the surrounding into the system it is…

Answer 11

endothermic

Question 12

When heat flows from the system into the surroundings it is…

Answer 12

exothermic

Question 13

What are the units for specific heat capacity?

Answer 13

J/gC