Sec1 Sci C8p EQ 62marks Atoms elements compounds & mixtures€¦ · Web viewSec1 Sci C8p EQ...

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Sec1 Sci C8p EQ 62marks Atoms elements compounds & mixturesQ# 1/ Q11.Copper can be obtained form its ore, copper sulphide, in two stages.

First stage heating the ore in air

Copper sulphide reacts with oxygen from the air to form copper oxide and sulphur dioxide gas.

Second stage heating the copper oxide with carbon

Copper oxide reacts with carbon to form copper and carbon dioxide gas.

(a) Give the names of three elements mentioned above.

1. .................................... 2. .......................................... 3. ............................................1 mark

(b) Give the name of one compound mentioned above.

......................................................................................................................1 mark

(c) Give the name of the compound, mentioned above which causes ‘acid rain’.

......................................................................................................................1 mark

Q# 2/ Q15. The diagram shows the parts of an iron.

(a) Choose words from the list below to fill the gaps in the sentences.

The bottom of the iron is made of steel because steel is a good

conductor of ……………………………, and because steel has a

…………………………… melting point.

The steel is polished until it is very smooth to reduce the force of

…………………………… between the iron and the cloth.

Patrick Brannac www. Smashing Science.org of 15

http://www.SmashingScience.org/

3 marks

(b) Suggest what material the handle could be made from.

………………………………….1 mark

Give a reason for your answer.

……………………………………………………………………………………….1 mark

(c) The iron has three temperature settings.

The settings for different fabrics are shown below.

What might happen if nylon clothes are ironed on the setting?

……………………………………………………………………………………….1 mark

(d) After it is switched on, the iron heats up. The time it takes to heat up is shown below.

Suggest the time to heat up on the setting.

Write your answer in the table.1 mark

Q# 3/ Q27. The drawings show six objects made from different materials.



(a) Fill the gaps in the sentences below.

The objects are made from materials that are all types of ...........................1 mark

All the materials are good conductors of electricity and ...............................1 mark

(b) From the drawings above give one object that could rust.

......................................................................................................................1 mark

(c) The drawing below shows part of an electric cable and a plug.

(i) What material could be put around the wires to insulate them?

.............................................................................................................1 mark

(ii) Why is this insulating material needed?

.............................................................................................................1 mark

(d) Which pair of objects is attracted to a magnet?

Tick the correct box.



1 mark



Q# 4/ Q2. Magnesium burns in air giving a very bright light.

(a) Complete the word equation below to show this reaction.

magnesium + ............................................. → ...........................................1 mark

The diagram shows four gas-jars. Each contains a different gas. Burning magnesium is put into each jar.

(b) In one of the gas-jars, the magnesium goes out immediately.

Name the gas in this jar.

............................................................1 mark

Explain your answer.

......................................................................................................................1 mark

Q# 5/ Q26. (a) The diagrams below show the arrangement of atoms or molecules in five different substances A, B, C, D and E.

Each of the circles , and represents an atom of a different element.

Give the letter of the diagram which represents:

(i) a mixture of gases;

.............. 1mark

(ii) a single compound.



..............1 mark

(b) The diagram below shows a model of a chemical reaction between two

substances.

(i) How can you tell from the diagram that a chemical reaction took place

between substance P and substance Q?

.............................................................................................................1 mark

(ii) Substance P is carbon.

Suggest what substances Q and R could be.

substance Q .......................................................................................

substance R .......................................................................................1 mark

(iii) How does the diagram show that mass has been conserved in this

reaction?

.............................................................................................................1 mark

Q# 6/ Q35. (a) The diagram below shows part of the periodic table of elements.

The shaded area contains only metal elements.

Two other areas also contain only metal elements.

Which areas contain only metal elements?

Tick the two correct boxes.



A B C D E 1 mark

(b) Copper is a metal.

At room temperature copper is a strong solid.

Give two other properties of copper that show it is a metal.

1. ....................................................................................................................1 mark

2. ....................................................................................................................1 mark

(c) When copper metal is heated it reacts with a gas in air.

What is the chemical name of the product formed when copper reacts with a gas in air?

......................................................1 mark

(d) Which statement below describes what happens in a chemical change but not in a physical change?

Tick the correct box.

1 mark



Q# 7/ Q32. (a) The drawings below show three objects made from copper.

Draw a line from each object to the reason for using copper for that object.

Draw only three lines.

3 marks

(b) Brass is a mixture of copper and zinc. Some keys are made from brass

Why is brass more suitable than copper for a key?

Tick the two correct boxes.



2 marks

(c) Zinc melts at 420°C.

Copper melts at 1085°C.

A scientist heated a mixture of pieces of zinc and pieces of copper to 600°C in a dish.

What would be in the dish at 600°C?

1 mark

Q# 8/ Q3. Krypton is an element which is a non-metal. Tungsten is an element which is a metal.

(a) The lines show one property of krypton and one property of tungsten. Draw two more lines from each element to its other properties.

4 marks

(b) The diagram shows a light bulb.



Give two properties which make tungsten a good material for light bulb filaments. Choose from the list of properties above.

1. ..................................................................................................................

2. ..................................................................................................................2 marks

Maximum 6 marks

Q# 9/ Q7. This question is about four chemical elements.

(a) The melting points and boiling points of the four elements are shown in the table. Complete the table to give the physical state, solid, liquid or gas, of each element at room temperature, 21°C.

4 marks

(c) Is bromine a solid, a liquid or a gas when the arrangement of particles is:

(i) far apart and random? .......................................................................1 mark

(ii) close together but random? ...............................................................1 mark

(iii) close together in a regular pattern? ...................................................1 mark

Maximum 8 marksQ# 10/ Q16.(a) The table shows some of the properties of three different substances, X, Y and Z. Complete the last column by stating whether each substance is a metal, a non-metal or a compound.



3 marks

(b) Complete the following using one of the phrases.

Closer together further apart in contact with more particles

Substance Z has a boiling point of –161°C. At room temperature the

particles of Z are ..................................... than the particles of substance X.1 mark

(c) Substance Z burns in air. What must be present in air for substance Z to burn?

......................................................................................................................1 mark

Q# 11/ Q34. (c) The chemical formulae for four acids are shown in the table below.

(i) Give the name of the element that is present in all four acids.

..................................................1 mark

(ii) Give the names of the two other elements present in sulphuric acid.

1. ................................................1 mark

2. ................................................1 mark

(iii) How many atoms are there in the formula HNO3 (nitric acid)?

...................1 mark

Q# 12/ Q29. A science teacher showed her class three experiments, A, B and C.

The experiments and the word equations for the reactions that took place are shown

below.

All the experiments were done in a fume cupboard.



(a) From the substances in experiments A, B and C, above, give the name of:

(i) one metallic element;

.............................................................1 mark

(ii) one non-metallic element;

.............................................................1 mark

(iii) two compounds.

................................................... and ...................................................1 mark

(b) In experiment B, the iron filings weighed 2.0 g at the beginning of the experiment



and the iron sulphide produced weighed 2.8 g.

Explain this increase in mass.

.........................................................................................................................1 mark

(c) Complete the word equation for the chemical reaction in experiment C.

copper + chlorine ? .............................................................1 mark

maximum 5 marks

Mark SchemeQ# 1/ Q11.(a) copperoxygencarbonanswers may be in any orderall three elements are required for the markaccept correct symbols for the elementsaccept ‘sulphur’ as one of the three elements

1 (L5)(b) any one from• copper sulphide• copper oxide• sulphur dioxide• carbon dioxide

1 (L5)(c) sulphur dioxidedo not accept ‘carbon dioxide’

1 (L5)Q# 2/ M15. (a) heat

1 (L3) high

1 (L4) frictionanswers must be in the correct order

1 (L4)(b) plasticaccept a suitable, named plasticaccept ‘wood’ or ‘rubber’

1 (L3) any one from• it is a poor conductor of heat or electricityaccept ‘it does not conduct’ or ‘it is an insulator’or ‘your hand does not get hot’• it is light• it is easy to shapeaccept ‘it is rigid or stiff’do not accept ‘it is strong’

1 (L4)(c) they might meltaccept ‘it makes a hole’ or ‘they burn’

1 (L3)(d) accept any time from 45 to 60 seconds

1 (L4)Q# 3/ M27. (a) metal

1 (L3)any one from• heat• thermal energy

1 (L3)(b) any one from• nailaccept ‘iron’• paper-clipaccept ‘steel’ or ‘clip’

1 (L4)

(c) (i) any one from• plasticaccept a named plastic• rubber• PVC

1 (L3)(ii) any one from• to stop you getting a shockaccept ‘to stop you being electrocuted’‘to insulate them’ is insufficient as it isgiven in the questionaccept ‘to make it safe’• so the wires do not touchaccept ‘to prevent them short circuiting’accept ‘it does not conduct electricity’

1 (L4)(d) iron nail and steel paper-clip if more than one box is ticked, award no mark

1 (L3)Q# 4/ M2. (a) oxygen → magnesium oxideboth parts of the equation are neededdo not accept ‘air’ for oxygen

1(b) nitrogen

1 the following explanations are only applicable to nitrogen: if any other



answer is given above a mark cannot be awarded for the second part any one from• contains no oxygenaccept ‘the other jars all contain oxygen’• nitrogen is unreactiveaccept ‘nitrogen does not support burning’1Q# 5/ M26. (a) (i) B

1 (L7)(ii) D

1 (L7)(b) (i) any one from• a compound or a new substance has been formedaccept ‘the ratio is always 1P to 2Qs’accept ‘the atoms or particles have joined’• R or the product is a new substanceaccept ‘the elements have joined’

1 (L7)(ii) substance Q: oxygen substance R: carbon dioxideboth answers are required for the mark

1 (L7)

(iii) the same numbers of each type of atom are presentaccept ‘the same number of atoms is present’accept ‘the same particles or same numberof particles are present’accept ‘there is the same amount of each element’do not accept ‘the same number of molecules is there’‘the same amount of elements’ is insufficient

1 (L7)Q# 6/ M35(a) • B C both answers are required for the markif more than two boxes are ticked, award no mark

1 (L6)(b) any two from• it conducts electricity• it conducts heatone mark may be awarded for ‘it is a goodconductor’ if a reference to heator electricity is not given• it is ductile or malleable‘it bends’ is insufficient• it has a high melting or boiling pointaccept ‘it is shiny’

accept ‘it is sonorous’accept ‘it forms basic oxides’‘it is strong or hard’ is insufficient

2 (L5)(c) copper oxideaccept ‘CuO’do not accept ‘copper dioxide’

1 (L6)(d) The atoms have combined in a different way to make a new substance.

if more than one box is ticked, award no mark

1 (L6)[5]

Q# 7/ M32. (a)

if more than one line is drawn from an object,award no mark for that object

3 (L3)

(b) • Brass does not bend as easily as copper. if more than two boxes are ticked,deduct one mark for each incorrect tick

1 (L3)• Brass is harder than copper minimum mark zero

1 (L3)(c) • liquid zinc and solid copper if more than one box is ticked, award no mark

1 (L4)[6]

Q# 8/ M3. (a)



If more than four lines are drawn, deduct one markfor each incorrect lineminimum mark zero

4 (L4)(b) answers may only be taken from the list in part (a) good electrical conductor

1 (L4) melting point of 3422°C

1 (L4)answers may be in either orderaccept ‘conducts electricity’ or ‘conductor’accept ‘ high melting point’ or ‘solid at high temperatures’do not accept ‘good thermal conductor’

[6]

Q# 9/ M7. (a)

4 (L6)

(c) (i) gas1 (L6)

(ii) liquid1 (L6)

(iii) solid1 (L6)

Q# 10/ Q16.(a) X nonmetal do not accept ‘non-metallic compound’

1

Y metal do not accept ‘metallic compound’

1 Z compound

1(b) further apart

1(c) oxygen

1[5]

Q# 11/ M34(c) (i) hydrogen‘H2’ or ‘H’ are insufficient

1 (L6)(ii) • sulphur

1 (L6)• oxygen

1 (L6)‘S’ or ‘O’ or ‘O2’ are insufficientanswers can be in either order(iii) 51 (L6)Q# 12/ M29. (a) (i) any one from• iron• copperaccept calcium

1 (L5)(ii) any one from• sulphur• chlorineaccept ‘oxygen’ or ‘carbon’

1 (L5)(iii) any two from• calcium carbonate• calcium oxide• carbon dioxide• iron sulphideaccept ‘copper chloride’answers may be in either order both answers are required for the mark

1 (L6)(b) any one from• the iron reacted or combined with sulphuraccept ‘the iron gained sulphur’or ‘sulphur was added to the iron’accept ‘the iron has joined with the sulphur’do not accept ‘iron has mixed with the sulphur’do not accept ‘sulphur or iron added a new layer’• the sulphur had massaccept ‘the sulphur weighed 0.8 g’

1 (L6)(c) copper chloride

1 (L6)[5]



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