WA2 Practice Paper: Weighted Assessment 2 — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer in the brackets provided.

1. 1

   Iron rusts only when both of these are present.

   1. Aoxygen and water
   2. Boxygen and oil
   3. Cwater and paint
   4. Dnitrogen and water
   ( )
2. 2

   Hydrochloric acid is added to sodium hydroxide until the solution is neutral. The products are

   1. Aonly hydrogen gas
   2. Bonly water
   3. Ca salt and water
   4. Da salt and hydrogen
   ( )
3. 3

   In a food chain, the organism that makes its own food using light is the

   1. Aconsumer
   2. Bproducer
   3. Cdecomposer
   4. Dpredator
   ( )
4. 4

   Which change is a chemical change?

   1. Aice melting
   2. Bsalt dissolving in water
   3. Csteam condensing
   4. Dmagnesium burning in air
   ( )
5. 5

   In a food chain the arrows show

   1. Athe direction energy is transferred
   2. Bwhich animal is larger
   3. Cthe direction animals move
   4. Dwhich organism is a decomposer
   ( )
6. 6

   A few drops of blue litmus are added to a colourless liquid and the litmus turns red. The liquid is

   1. Aalkaline
   2. Bneutral
   3. Cacidic
   4. Da metal
   ( )
7. 7

   Bacteria and fungi that break down dead leaves are

   1. Aproducers
   2. Bdecomposers
   3. Cpredators
   4. Dprey only
   ( )
8. 8

   Which factor is abiotic?

   1. Athe number of caterpillars
   2. Ba disease in the trees
   3. Cthe grass in a field
   4. Dthe temperature of the pond
   ( )
9. 9

   Which observation shows that a new substance has formed?

   1. Aa gas is given off and the solid left behind has a new colour
   2. Ba solid is crushed into a powder
   3. Cwater is poured from one beaker into another
   4. Da metal block is warmed and then cools down
   ( )
10. 10

    Ladybirds eat aphids. In this feeding relationship the ladybird is

    1. Aa producer
    2. Bthe prey
    3. Ca predator
    4. Dan abiotic factor
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show your working for calculations.

1. 1

   Four iron nails are left for one week in different conditions.

   Table 1.1

   Nail	Conditions
   P	dry air, no water
   Q	water with air above it
   R	boiled water with a layer of oil
   S	painted, then left in damp air

   1. (a)

      Which nail rusts the most? Explain your choice.

      [2]
   2. (b)

      Explain why nail R does not rust.

      [2]
   3. (c)

      State how the paint on nail S prevents rusting.

      [1]
2. 2

   A student adds dilute hydrochloric acid to magnesium ribbon in a boiling tube.

   1. (a)

      State two observations that show a chemical change is happening.

      [2]
   2. (b)

      Name the gas produced and the test for it.

      [2]
   3. (c)

      The acid is replaced with sodium hydroxide solution of the same concentration, and a piece of red litmus is dipped in. State the colour of the litmus.

      [1]
3. 3

   This food chain comes from a school pond: algae → mosquito larva → guppy → kingfisher.

   1. (a)

      Name the producer.

      [1]
   2. (b)

      Name one predator and its prey in this chain.

      [2]
   3. (c)

      A disease kills most of the guppies. Suggest what happens to the number of mosquito larvae, and why.

      [2]
4. 4

   Students sample a patch of grassland before and after a long dry spell.

   1. (a)

      State one biotic factor and one abiotic factor they could record.

      [2]
   2. (b)

      The grass turns brown and some plants die. Explain how this can reduce the number of grasshoppers.

      [2]
   3. (c)

      Name the group of organisms that will break down the dead plants.

      [1]