3.2.23 Chemical Reactions

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

• Endothermic

• Decomposition

• Exothermic

• Indothermic

_____ reactions usually feel hot!

• endothermic

• exothermic

Which of the following is true .

• Acids and bases form hydroxide ions in solution

• Acids form hydroxide ions and bases hydrogen ions in solution

• Acids form hydrogen ions in solution, bases do not form ions in solution

• Acids form hydrogen ions in solution and bases hydroxide ions

What is the definition of a base?

• a substance that donates a hydrogen (H+) ion

• a substance that donates a hydroxide (OH-) ion

• a substance that accepts a hydrogen (H+) ion

• a substance that accepts a hydroxide (OH-) ion

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO₃ → Ag + _____

• Cu(NO₃)₂

• CuNO₃

• CuAg

• Cu