Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases. Endothermic reactions take in energy and the temperature of the surroundings decreases.
What piece of apparatus is used to measure temperature changes?
Top pan balance
What term is given to a reaction which transfers heat energy to the surroundings?
When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?
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
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?
Oxidation of magnesium
What can you deduce from the reaction profile below?
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? - Higher
It is very slow