Exothermic & Endothermic Reaction

What piece of apparatus is used to measure temperature changes?

• Top pan balance

• Thermometer

• Colorimeter

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

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

• Endothermic

• Decomposition

• Exothermic

Which of the following should be used to contain the solution when investigating an energy change?

• A polystyrene cup

• A glass beaker

• A measuring cylinder

If the energy change on an energy level diagram is negative, what does this tell you about the reaction?

• It is endothermic

• Nothing

• It is exothermic

On a reaction profile, what does the height of the hump represent?

• The activation energy

• The energy change

• The energy released when new bonds are made

Which of these is an endothermic reaction?

• Combustion

• Thermal decomposition

• Oxidation of magnesium

What can you deduce from the reaction profile above?

• The reaction is endothermic

• A catalyst is present

• More energy is released than absorbed

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 exothermic

• The reaction is reversible

If a reaction releases more energy when new bonds are made than the amount of energy absorbed to break bonds in the reactants, which statement is true?

• It is endothermic

• It is exothermic

• It is very slow