Exam Questions (19 marks) 50 2.1 1.9 2.3 2.1 60 0.0 0.0 0.0 0.0 Q1.Catalase is an enzyme. (a) Why did the student carry out the experiment three times Catalase controls the following reaction: at each temperature? hydrogen peroxide water + oxygen Tick one box. A student did an investigation on catalase activity. This is the To make the experiment more accurate method used. To prove the experiment was correct 1. Put 1 cm3 hydrogen peroxide solution in a test tube. To show the experiment was more 2. Add 1 cm3 of catalase solution. repeatable (1) Bubbles of oxygen are produced. • (b) The student thought one result was an anomaly. Bubbles cause foam to rise up the tube. • Circle the anomaly in the table above. 3. Measure the maximum height of the foam. (1) The diagram below shows the experiment. (c) What did the student do with the anomalous result? ____________________________________(1) The experiment is carried out at 20 °C. The table below shows some results from the investigation. (d) Look at the table above. Maximum height of foam in cm Temperature What conclusion can be made as the temperature in °C increases? Test 1 Test 2 Test 3 Mean 10 1.3 1.1 0.9 1.1 Tick one box. 20 0.0 3.3 3.1 3.2 Decreases the rate of reaction up to 30 °C 30 5.2 5.0 5.3 5.2 Decreases the rate of reaction up to 40 °C 40 4.2 3.5 4.4 4.0 Increases the rate of reaction up to 30 °C
Exam Questions (19 marks) Q1.Catalase is an enzyme. Catalase controls the following reaction: hydrogen peroxide water + oxygen A student did an investigation on catalase activity. This is the method used. 1. Put 1 cm3 hydrogen peroxide solution in a test tube. 2. Add 1 cm3 of catalase solution. • Bubbles of oxygen are produced. • Bubbles cause foam to rise up the tube. 3. Measure the maximum height of the foam. The diagram below shows the experiment. The experiment is carried out at 20 °C. The table below shows some results from the investigation. Temperature in °C Maximum height of foam in cm Test 1 Test 2 Test 3 Mean 10 1.3 1.1 0.9 1.1 20 0.0 3.3 3.1 3.2 30 5.2 5.0 5.3 5.2 40 4.2 3.5 4.4 4.0 50 2.1 1.9 2.3 2.1 60 0.0 0.0 0.0 0.0 (a) Why did the student carry out the experiment three times at each temperature? Tick one box. To make the experiment more accurate To prove the experiment was correct To show the experiment was more repeatable (1) (b) The student thought one result was an anomaly. Circle the anomaly in the table above. (1) (c) What did the student do with the anomalous result? ____________________________________(1) (d) Look at the table above. What conclusion can be made as the temperature increases? Tick one box. Decreases the rate of reaction up to 30 °C Decreases the rate of reaction up to 40 °C Increases the rate of reaction up to 30 °C