Science Y8Y9 Past Year Checkpoint Edexcell June 2021

(a) (i) Name the piece of equipment the student should use to measure the volume of the dilute hydrochloric acid.

Answer explanation

measuring cylinder / pipette / burette

(a) (ii) Give the meaning of this symbol

Answer explanation

(moderate) (health) hazard ACCEPT harmful / irritant

(a) (iii) State one safety precaution the student should take when doing this investigation

Answer explanation

wear (safety) goggles / safety glasses /eye protection

(i) One of the results is anomalous. Circle the anomalous result

Answer explanation

point at 40°C circled

(ii) Draw a curve of best fit to complete the graph

Answer explanation

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(a) Complete the table by calculating the stretch of rubber band B with one weight added.

Answer explanation

2.0

(b) Describe the pattern shown by the results for rubber band A.

Answer explanation

as the number of weights increases (1) the stretch increases / pointer position reading decreases (1) Allow each time a weight is added the rubber stretches 2.5 cm or stretch is directly proportional to the number of weights added to gain both marks

(c) Before doing the investigation, the student makes this prediction: “As each weight is added rubber band B will stretch more than rubber band A.” Explain whether the results support the student’s prediction

Answer explanation

{initially / for small weights / for up to 4 weights} rubber band A stretches more than rubber band B (1) with {5 / 6 } weights rubber band B does have a greater stretch than A (1) when more than 3 weights are added (to the rubber bands) B stretches more than A for each added weight (1)