WA1 Practice Paper: Weighted Assessment 1 — 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.

1. 1

   Which apparatus is best for collecting and measuring the total volume of gas made in a slow reaction?

   1. Aa gas syringe
   2. Ba burette
   3. Ca measuring cylinder
   4. Da conical flask
   ( )
2. 2

   Sand is mixed with copper(II) sulfate solution. The solid is separated by

   1. Aevaporation, collecting the sand
   2. Bdistillation, collecting the sand
   3. Cchromatography, splitting the sand
   4. Dfiltration, leaving the solution as filtrate
   ( )
3. 3

   A chromatogram of ink P shows two spots at the same heights as the spots of dyes X and Y run alongside. This shows that P contains

   1. Ano dyes
   2. Bonly dye X
   3. Cdyes X and Y
   4. Da dye different from X and Y
   ( )
4. 4

   A liquid boils over the range 98–104 °C. It is

   1. Aa pure liquid
   2. Ba mixture
   3. Can element
   4. Dimpossible to tell anything
   ( )
5. 5

   In which state of matter are the particles held in fixed positions, vibrating about them?

   1. Asolid only
   2. Bliquid only
   3. Cgas only
   4. Dall states
   ( )
6. 6

   When a liquid evaporates, the particles that escape are the ones that

   1. Aare largest
   2. Bcarry the least energy
   3. Ctouch the container walls
   4. Dcarry the most energy
   ( )
7. 7

   Melting is best described as a change in which energy is

   1. Areleased while the temperature rises
   2. Btaken in while the temperature stays constant
   3. Creleased while the temperature stays constant
   4. Dtaken in while the temperature falls
   ( )
8. 8

   An atom of aluminium has proton number 13 and nucleon number 27. The numbers of protons, neutrons and electrons are

   1. A13 p, 27 n, 13 e
   2. B14 p, 13 n, 14 e
   3. C13 p, 14 n, 13 e
   4. D13 p, 13 n, 27 e
   ( )
9. 9

   The species ³⁵₁₇Cl⁻ contains

   1. A17 protons, 18 electrons
   2. B17 protons, 16 electrons
   3. C18 protons, 17 electrons
   4. D35 protons, 17 electrons
   ( )
10. 10

    Two atoms are isotopes of the same element if they have the same number of

    1. Aneutrons but different protons
    2. Bprotons but different neutrons
    3. Celectrons but different protons
    4. Dnucleons but different protons
    ( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided. Show all necessary working.

1. 1

   A student has a beaker of muddy salty water — clay particles (insoluble) and salt dissolved in the water.

   1. (a)

      Name the process that separates the clay from the salty water, and name the solid collected.

      [2]
   2. (b)

      Describe how the salt could then be obtained as dry crystals from the filtrate.

      [2]
   3. (c)

      State why the salt obtained this way is pure, in terms of melting point.

      [2]
2. 2

   A pure solid is heated steadily from room temperature. Its temperature is recorded every minute.

   Temperature against time

   Time / min	0	2	4	6	8	10	12
   Temperature / °C	25	48	70	80	80	80	96

   1. (a)

      State the melting point of the solid.

      [1]
   2. (b)

      Explain, using particles and energy, why the temperature stays constant between minutes 6 and 8.

      [3]
   3. (c)

      State what the particles are doing at minute 5 that they were not doing at minute 1.

      [2]
3. 3

   The particles of a gas are described as small, far apart and moving fast and randomly.

   1. (a)

      Use the particle model to explain why a gas can be compressed into a smaller volume but a solid cannot.

      [3]
   2. (b)

      State what happens to the average energy of the gas particles when the gas is heated, and what property of the gas changes as a result.

      [2]
4. 4

   The table gives information about three species.

   Species data

   Species	Protons	Neutrons	Electrons
   A	11	12	11
   B	11	14	11
   C	17	18	18

   1. (a)

      Which two species are isotopes of the same element? Explain your choice.

      [2]
   2. (b)

      Which species is a negative ion? Explain how the table shows it.

      [2]
   3. (c)

      Write the nuclide notation (with proton and nucleon numbers) for species C, and state its nucleon number.

      [3]
5. 5

   A student compares two black inks, P and Q, by paper chromatography. Dyes R and S are run alongside as known samples. The finished chromatogram shows: P has two spots at the same heights as R and one spot matching S; Q has one spot at a height matching neither R nor S.

   1. (a)

      State what the chromatogram shows about ink P.

      [2]
   2. (b)

      State what the chromatogram shows about ink Q.

      [2]
   3. (c)

      Explain why the different dyes travel different distances up the paper.

      [2]