More Exothermic and Endothermic reactions

Question 1

What is the independent variable for the practical for exothermic and endothermic

Answer 1

the volume of sodium hydroxide solution

Question 2

What is the dependent variable for the practical for exothermic and endothermic

Answer 2

the maximum temperature reached

Question 3

What is the control variable for the practical for exothermic and endothermic

Answer 3

the volume of hydrochloric acid

Question 4

What is the practical for exothermic and endothermic

Answer 4

1) measure 30cm3 of dilute hydrochloric acid using a measuring cylinder
2) transfer the acid into a polystyrene cup in a beaker to stop it from falling
3) use a thermometer to measre the temperature of the acid
4) use a measuring cylinder to measure 5cm3 of sodium hydroxide solution and pour it into the polystyrene cup
5) place a lid on the cup and place the thermometer in the hole of the lid
6) stir the solution
7) look at the temperate rise and record it
8) repeat steps 1 to 7 using 10cm3 of sodium hydroxide

Question 5

On a reaction profile, how to do you know if it is exothermic

Answer 5

The products are lower than the reactants

Question 6

What is activation energy

Answer 6

The minimum amount of energy needed for a reaction to occur

Question 7

On a reaction profile, how do you know if it is endothermic

Answer 7

The products are higher than the reactants