Untitled Presentation

Multiple Choice

What kind of reaction is this?

• endothermic

• exothermic

Multiple Choice

A reaction accompanied by or requiring the absorption of heat.

• endothermic
• exothermic
• catalyst
• activation energy

Multiple Choice

A reaction accompanied by the release of heat.

• endothermic
• exothermic
• catalyst
• activation energy

Multiple Choice

Which statement is FALSE for an endothermic reaction?

• Products higher in energy and less stable
• Reactants lower in energy and more stable
• Products have stronger bonds than reactants
• Reactants have stronger bonds than products

Multiple Choice

The potential energy diagram shown represents the reaction

A + B → AB

Which statement correctly describes this reaction?

• It is endothermic and energy is absorbed.

• It is endothermic and energy is released.

• It is exothermic and energy is absorbed.

• It is exothermic and energy is released.

Multiple Choice

What is an exothermic reaction?

• A reaction that absorbs energy from its surroundings.

• A reaction that releases energy to its surroundings. You feel heat.

• A reaction where temperature remains constant.

• A reaction that only occurs at high temperatures.

Multiple Choice

Which graph represents an endothermic reaction?

• A

• B

Multiple Choice

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

Multiple Choice

What kind of graph is this?

• endothermic
• exothermic

Open Ended

Explain the significance of coefficients in thermochemical equations.

Multiple Choice

What is the difference between exothermic and endothermic reactions?

• Exothermic reactions release heat, while endothermic reactions absorb heat

• Exothermic reactions absorb heat, while endothermic reactions release heat

• Both types of reactions release heat

• Both types of reactions absorb heat

Multiple Choice

What is a thermochemical equation?

• A balanced chemical equation that includes heat change (ΔH)

• An equation that only includes reactants

• An equation that only includes products

• An equation that does not include heat change

Open Ended

List two common mistakes to avoid when working with ΔH values.

Open Ended

Explain the significance of a large negative ΔH value in a chemical reaction.

Multiple Choice

What should you always pay attention to when interpreting ΔH values?

• The temperature

• The physical states of the substances

• The pressure

• The volume

Multiple Choice

What happens to the value of ΔH when you reverse a reaction?

• It remains the same

• It doubles

• It changes sign

• It becomes zero

Multiple Choice

What is ΔH for: C + O₂ → CO₂?

• -92 kJ

• -184 kJ

• -286 kJ

• -394 kJ

Multiple Choice

What is ΔH for: 2H₂ + O₂ → 2H₂O(l)?

• -92 kJ

• -184 kJ

• -286 kJ

• -394 kJ

Multiple Choice

What is ΔH for producing 4 NH₃?

• -92 kJ

• -184 kJ

• -286 kJ

• -394 kJ

Open Ended

What does the reaction C + O₂ → CO₂ tell you about thermochemical equations?

Multiple Choice

Find ΔH for the reaction C + 1/2 O₂ → COC + 1/2 O₂ → CO.

• -394 kJ

• -283 kJ

• -572 kJ

• -890 kJ

Multiple Choice

What is ΔH for the reaction CO₂ + C + O₂ → C + O₂ + CO₂?

• -394 kJ

• -283 kJ

• -572 kJ

• -890 kJ

Open Ended

Find ΔH for the reaction: C + 2H2 → CH4