AQA GCSE CHEM Energy Changes Flashcard FT

Front

What is meant by the term ‘conservation of energy’ in chemical reactions?

Back

the amount of energy in the universe at the end of a chemical reaction is the same as before the reaction takes place

Front

Which of the following is an example of an exothermic reaction?

• combustion
• cooking an egg
• photosynthesis
• thermal decomposition

Back

combustion

Front

Which variable would not affect the temperature change in a reaction between a metal carbonate and an acid? Options: the volume of acid, the concentration of the acid, the mass of metal carbonate, the room temperature

Back

the room temperature

Front

How can the transfer of energy to the surrounding air be minimised during a chemical reaction?

Back

Carry out the reaction in a polystyrene cup.

Front

Activation energy

Back

the energy needed for a reaction to occur

Front

What will happen to the temperature of the mixture during the exothermic reaction between magnesium metal and hydrochloric acid?

Back

The temperature will increase.

Front

Example of an endothermic reaction: combustion, neutralisation, respiration, thermal decomposition

Back

thermal decomposition

Front

Possible sources of error when investigating temperature changes during chemical reactions?

Back

all of the above

Front

Equipment not necessary for investigating temperature change in a displacement reaction with different metals.

Back

timer

Front

What is an endothermic reaction?

Back

a reaction that takes in more energy from the surroundings than it releases, increasing the temperature of the surroundings