Chemistry > GCSE QUESTION PAPER > GCSE COMBINED SCIENCE: TRILOGY Higher Tier Chemistry Paper 2H,. (All)

GCSE COMBINED SCIENCE: TRILOGY Higher Tier Chemistry Paper 2H,.

Document Content and Description Below

A student investigated the reaction between magnesium and excess hydrochloric acid. Figure 1 shows the apparatus. Figure 1 This is the method used. 1. Pour 50 cm3 of hydrochloric acid into a coni... cal flask. 2. Add a piece of magnesium. 3. Insert stopper and delivery tube and start a timer. 4. Collect the gas produced in a gas syringe. 5. Record the volume of gas produced every 20 seconds for 2 minutes. 6. Repeat steps 1 to 5 with higher concentrations of hydrochloric acid. 0 1 . 1 Give the independent variable and one control variable in this investigation. [2 marks] Independent variable Control variable Question 1 continues on the next page4 *04* IB/M/Jun21/8464/C/2H Do not write outside the Table 1 shows the results from the first experiment using hydrochloric acid with a box low concentration. Table 1 Time in seconds 0 20 40 60 80 100 120 Volume of gas in cm3 0 48 72 90 97 98 98 0 1 . 2 Complete Figure 2. You should: • plot the data from Table 1 (the point 0,0 has been plotted for you) • draw a line of best fit. [3 marks] Figure 25 *05* Turn over ► IB/M/Jun21/8464/C/2H Do not write outside the 0 1 . 3 How does the rate of this reaction change with time? box Use Table 1. [1 mark] Tick () one box. The rate decreases. The rate stays the same. The rate increases. 0 1 . 4 The student repeated the experiment using hydrochloric acid with a higher concentration. Which statement is correct? [1 mark] Tick () one box. The activation energy for the reaction was higher. The magnesium reacted more quickly. The reaction finished at the same time. The total volume of gas collected was smaller. Question 1 continues on the next page6 *06* IB/M/Jun21/8464/C/2H Do not write outside the box 10 0 1 . 5 Temperature also affects the rate of the reaction. Explain how increasing the temperature affects the rate of the reaction. You should refer to particles and collisions. [Show More]

Last updated: 2 years ago

Preview 1 out of 28 pages

Buy Now

Instant download

We Accept: