Collision Theory & Energy in Chemical RXNs

Multiple Choice

ΔH is a result of which of the following?

• Protons colliding in chemical reactions.

• Heat energy being used to undergo a phase change.

• Heat energy that is a result from breaking and forming bonds in a chemical reaction.

• Heat energy being absorbed from the surroundings.

Multiple Choice

What 2 things are needed for a collision to be effective?

• Increased mass and decreased speed
• High temperature and low pressure
• Sufficient energy and proper alignment
• Random movement and lack of force

Multiple Choice

Summary 20b) H₂SO₄   +  Mg →  MgSO₄ + H₂  +  446kJ      

• Endothermic

• Exothermic

Multiple Choice

Summary 20c) 131.3kJ  +  C  +  H2O  →  Co  +  H2 

• Endothermic

• Exothermic