Heat of Formation

Multiple Choice

WARM UP: What two things are needed for an effective collision?

• Sufficient energy and proper orientation
• Excessive force and incorrect timing
• Random movement and no barriers
• High temperature and low pressure

Multiple Choice

The formula for calculating ΔH is

• reactants -

  product

• products -

  reactants

• products /

  reactants

• reactants +

  products

Multiple Choice

Where can I find this formula for ΔH on my reference sheet?

• The front using the PERIODIC TABLE

• The back under QUANTATIVE PROPERTIES AND OTHER FORMLAS

• The back under THERMOCHEMISTRY

• The back under ATOMIC STRUCTURE AND NUCLEAR

Multiple Choice

Which of the following below represents absorbing energy to break bonds?

• +ΔH

  endothermic

• +ΔH

  exothermic

• -ΔH

  endothermic

• -ΔH

  exothermic

Multiple Choice

What would happen to ΔH if 4 mol of H₂S (g) were used?

• It would double (x2)

• It would half (1/2)

• It would not change (NC)

• It would quadruple (x4)

Fill in the Blank

Type numbers only for your answer to Summary Practice #23. Do not include units.

-

.

Fill in the Blank

Type your answer in kJ to Summary Q#30 (numbers only)

-