Combined_Chemistry_units_1-3_Foundation (1) · Web viewThe number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this

Gateway Chemistry A (9-1)

Combined Chemistry units 1-3

FoundationOCR ExamBuilder process constraints mean you maysee slight differences between this paper and theoriginal.

Candidates answer on the Question Paper.A calculator may be used in this paper.

OCR supplied materials:Additional resources may be supplied with this paper.

Other materials required:• Pencil• Ruler (cm/mm)

Duration: 70 mins

INSTRUCTIONS TO CANDIDATES• Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.• Use black ink. HB pencil may be used for graphs and diagrams only.• Answer all the questions.• Read each question carefully. Make sure you know what you have to do before starting your answer.• Write your answer to each question in the space provided. Additional paper may be used if necessary but you must clearly show your candidate number, centre number and question number(s).

INFORMATION FOR CANDIDATES• The quality of written communication is assessed in questions marked with a pencil or an asterisk.• The number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this paper is 60.

© OCR 2017. You may photocopy this page. Page 1 of 17 Created in ExamBuilder

Answer all the questions.

1. The bar chart shows some information about the melting points of Group 1 elements.

What are the melting points of rubidium and caesium?

Melting point of rubidium (°C) Melting point of caesium (°C)A 39 29B 40 25C 29 41D 41 25

Your answer [1]

2. Look at the table.

It shows some fractions made from the fractional distillation of crude oil and their boiling ranges.

Fraction Boiling range (°C)LPG less than 25petrol 85 – 105diesel 150 – 290fuel oil 290 – 380

bitumen greater than 400

A hydrocarbon called eicosane has a boiling point which is 3.5 times the boiling point of petrol.

To which fraction does eicosane belong?

A. dieselB. LPGC. fuel oilD. bitumen

Your answer [1]


3. The molecular formula of decene is C10H20.

What is the empirical formula of decene?

A. CH2

B. C2H4

C. C5H10

D. C20H40

Your answer [1]

4. Rosa tests some compounds to find out if they conduct electricity.

Which row in the table shows the correct results for each compound?

Solid ionic compound

Ionic compound dissolved in

waterMolten ionic compound

A conducts does not conduct conductsB conducts conducts conductsC conducts conducts does not conductD does not conduct conducts conducts

Your answer [1]

5. Hardeep adds magnesium metal to a sample of acid and to a sample of alkali.

He measures the pH of the acid and the alkali.

What results should Hardeep expect?

Result for acid experiment Result for alkali experiment

A pH below 7no reaction with magnesium

pH above 7magnesium fizzes

B pH below 7magnesium fizzes

pH above 7no reaction with magnesium

C pH above 7magnesium fizzes

pH above 7no reaction with magnesium

D pH above 7no reaction with magnesium

pH below 7magnesium fizzes

Your answer


[1]

6. Which technique is the best for separating pure water from a solution of sodium chloride in water?

A. crystallisationB. chromatographyC. filtrationD. distillation

Your answer [1]

7. Lead is a metal.

Which statement is true about lead because it is a metal?

A. It is a dull grey colour.B. It is in Group 4 of the Periodic Table.C. It is in Period 6 of the Periodic Table.D. It is malleable so can be easily shaped.

Your answer [1]

8. What is the relative formula mass of sodium carbonate, Na2CO3?

A. 83.0B. 90.0C. 106.0D. 130.0

Your answer [1]


9. Tim is separating the colours in a sample of black ink using paper chromatography.

He puts a spot of black ink onto filter paper.

He dips the filter paper into ethanol in a beaker.

What is the name given to ethanol in this experiment?

A. gas phaseB. mobile phaseC. solid phaseD. stationary phase

Your answer [1]

10. Look at Tim's chromatogram.

What is the Rf value of the green spot? Use a ruler to help you.

A. 0.17B. 0.42C. 0.83D. 1.00

Your answer [1]

11(a). Complete the table below to give information about protons, neutrons and electrons.© OCR 2017. You may photocopy this page. Page 5 of 17 Created in ExamBuilder

Charge Mass in atomic mass units

proton .......................... 1

neutron .......................... ................

electron negative ................

[2]

(b). Look at the table. It shows information about some atoms and ions.

Particle Atomic number

Mass number

Number of protons

Number of neutrons

Number of electrons

Electronic structure

A 11 23 11 .............. 11 2.8.1B 9 19 9 10 9 ................C .............. 37 17 .............. 17 2.8.7D 13 27 ............. .............. 10 2.8

Complete the table.[4]

(c). Particle A is a metal atom, particle D is an ion.

Explain why.

[2]

(d). Element C has the electronic structure 2.8.7.

What does this tell you about the position of element C in the periodic table?

Explain your answer.

[4]

12(a). Hydrochloric acid is a strong acid.


Hydrochloric acid reacts with calcium carbonate.

calcium carbonate + hydrochloric acid → calcium chloride + carbon dioxide + water

Debbie places a 1.0 g lump of calcium carbonate into a flask.

She adds 25.0 cm3 of 1.0 mol / dm3 hydrochloric acid to the flask.

Debbie puts the flask on top of an electronic balance.

What happens to the reading on the balance during the reaction?


[2]

(b). Debbie repeats the experiment.

This time she uses 25.0 cm3 of 1.0 mol / dm3ethanoic acid instead of hydrochloric acid.

Her results are different this time.

How are the results different?


[2]

13. Copper hydroxide decomposes when heated. Copper oxide and water are made.

Jess heats some copper hydroxide. Look at the apparatus she uses.


She measures the mass of copper hydroxide at the start.

She then heats the copper hydroxide for 5 minutes. Jess lets the apparatus cool down.

She then measures the mass of copper oxide made.

Jess does the experiment three more times. Look at her results.

Experiment number

Mass of copper hydroxide

in gMass of copper oxide

made in g Mass of water made in g

1 0.50 0.41 0.092 1.00 0.82 0.183 1.50 1.22 ...........4 2.00 1.63 ...........

Jess predicts that the mass of water made depends on the mass of copper hydroxide heated.

Complete the results table.

Is Jess's prediction supported by her results?


[3]

14(a). This question is about energy changes during chemical reactions.

Cold packs are used to treat sports injuries.

The cold pack reduces the temperature of the injured part of the body.


A chemical reaction happens when the cold pack is squeezed.

Look at the table.

It shows the temperature changes for four different reactions, A, B, C and D.

Reaction Start temperature in °C

Final temperature in °C

Temperature change in °C

A 18 12 -6B 18 18 0C 18 25 +7D 18 23 +5

Which reaction would be the best one for use in the cold pack?

Choose from A, B, C or D.

answer ...........................................................[1]

(b). Aimee and Luke investigate four liquid fuels.

They burn 1.0 g of each liquid fuel.

Look at the diagram. It shows the apparatus they use.


Look at the table. It shows their results.

Liquid fuel Temperature at start in °C Temperature at end in °Cethanol 20 40

methylated spirits 21 39paraffin 22 45propanol 22 44

i. Which liquid fuel transfers the least energy?

answer ...........................................................

[1]

ii. Calculate the energy transferred by ethanol.

energy transferred = mass × specific heat capacity × temperature change

The specific heat capacity of water is 4.2 J/g°C

answer ........................................................... J

[2]


15. Joel's teacher investigates the electrolysis of four liquids.

The first liquid he uses is melted sodium chloride.

Look at the apparatus he uses.

The table shows the products made.

Liquid Product at cathode Product at anodelead bromide lead brominelead iodide lead iodine

sodium chloride sodium ............................................

potassium iodide ............................................ iodine

[2]

i. Complete the table.ii. Sodium chloride contains sodium ions, Na+, and chloride ions, Cl –.

Solid sodium chloride does not conduct electricity, but melted sodium chloride does conduct electricity.Explain why.

[2]

16(a). A bottle contains a solution.


The label has fallen off the bottle.

Sophia wants to find out the pH of the solution in the bottle.

Describe how she can do this.

[2]

(b). An acid reacts with a base to make a salt and water.

acid + base → salt + water

Look at the table. It shows some acids, bases and the salts made from them.

Acid Base Salt

sulfuric acid copper oxide copper sulfate

nitric acid sodium carbonate ..................................................

.................................................. zinc oxide zinc chloride

sulfuric acid .................................................. magnesium sulfate

Complete the table.[3]

(c). Look at the equation for a neutralisation reaction.

CuO + 2HCl → CuCl2 + H2O

Write down the formula of one product of this reaction.............................................

[1]


17(a). This question is about diamond and graphite.

Diamond and graphite are made of the same element.

Which element?[1]

(b). One property of diamond is that it is very hard.

Diamond is used to make cutting tools.

Write about some other properties of diamond.

[3]

18. An aluminium atom can be shown as

What do the numbers 27 and 13 mean?

Explain what the numbers tell you about the structure of an aluminium atom.© OCR 2017. You may photocopy this page. Page 13 of 17 Created in ExamBuilder

The quality of written communication will be assessed in your answer to this question.

[6]

19. Joel passes an electric current through copper(II) sulfate solution.

Joel does four experiments.

Joel changes either the time or the current.

Copper is made at the cathode.© OCR 2017. You may photocopy this page. Page 14 of 17 Created in ExamBuilder

He measures how much copper is made in each experiment.

Experiment Current in amps Time in minutes Mass of copper made in g1 0.15 5 0.202 0.30 5 0.403 0.15 10 0.404 0.60 10 1.60

Joel concludes that the amount of copper made is proportional to both the current and to the time.

Show how the results support this conclusion.

[2]

20. Phil investigates some exothermic and endothermic reactions.

He measures the temperature changes during some chemical reactions.Look at the table. It shows his results.Look at how Phil does the experiment.

1. He measures the temperature of one of the reactants at the start.2. He then adds the second reactant and stirs the mixture.3. He removes the thermometer from the beaker and then reads it to take the temperature

at the end of the reaction.

How should Phil improve his method? Explain your answer.


[2]

21. Here is a diagram of a sodium chloride crystal.

The Cl-Na-Cl length in a crystal of sodium chloride is 0.564 nm.

What is the volume of this cube in nm3? Give your answer to 3 significant figures.

volume = ........................................................... nm3 [3]


END OF QUESTION PAPER


Combined_Chemistry_units_1-3_Foundation (1) · Web viewThe number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this

Documents