| Liquid | Colour of indicator | pH | |--------|--------------------|----| | Lemon juice | Red | 2 | | Soap solution | Blue | ___ | | Water | Green | 7 |

(6 marks)

Time: 1 hour 30 minutes Total Marks: 50

A student tests three liquids with universal indicator:

(a) Write down the formula for force. (1 mark) (b) Calculate the force required. (2 marks) (c) If the car stops suddenly, why do passengers lurch forward? (2 marks) (d) State Newton’s first law of motion. (1 mark) (8 marks)

(b) Is lemon juice acidic, basic, or neutral? (1 mark) (c) Name another natural indicator besides universal indicator. (1 mark) (d) Describe what happens when an acid reacts with a base. (2 marks) (e) Write the word equation for the reaction between hydrochloric acid and sodium hydroxide. (3 marks) Total marks: 50