Chapter 5: Termochemistry

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

• Endothermic

• Exotermic

• Exothermic

• Endotermic

Examples of exothermic

• Acids + alkalis

• Cooking an egg

• Respiration

• Evaporating liquid water

Examples of endothermic reactions

• Photosynthesis

• Ice melting

• Respiration

• Sodium carbonate + ethanoic acid

• Water + calcium oxide

if less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

• Endothermic

• Exotermic

• Exothermic

• Entrothermic

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

• Exothermic

• Endothermic

• Exotermic

• Endotermic

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The solution at the end is acidic

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Decomposition

• Exothermic

• Indothermic

In an exothermic reaction, heat is ...

• taken in
• given out

In an endothermic reaction, heat is ...

• taken in

• given out

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm
• Cold