Physics Grade 8 Work Sheet - 5 Topic- Revision Name……………………………………… Sec- …. Date……..

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2.

CIDER International School

Grade: VIII Subject: Business Studies

Worksheet 5

Total Marks: 20

Name:………………………………………………..Sec…….Date………………

SK is a private limited company which makes nuts and bolts that’s producer products. They sales

those to the large car manufacturing companies. The sales of these products are in high level. These

are made to the exact specifications of the car companies and they are not sold to any other

customers. Some other makers have developed new products using new technology and materials.

(a) What is meant by ‘producer product’?

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(b) Identify two other examples of producer goods.

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(c) Identify and explain two benefits of the packaging of SK’s products.

Benefit 1: .................................................................................................................................

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Explanation: ..............................................................................................................................

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Benefit 2: .................................................................................................................................

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Explanation: ..............................................................................................................................

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(d) Identify and explain two limitations to SK of selling only to the large companies.

Limitation 1: ..................................................................................................................................

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Explanation: ..............................................................................................................................

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Limitation 2: ..................................................................................................................................

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Explanation: ..............................................................................................................................

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(e) Do you think SK should consider bringing out a new product? Justify your answer.

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Grade-8

Subject-Chemistry

4.Answer sheet on Ions test

1. (a) colourless solution (1)

(b) (i) aq. NaOH (1) white ppt. (1)

(ii) excess aq. NaOH, ppt. dissolves (1)

(c) (i) white ppt. (1)

(ii) ppt. dissolves (1)

(d) HNO3/aq. AgNO3 (2) white ppt. (1)

[Total-9]

2. (a) coloured solution ( [1]

(b)(i), (b)(ii), (c)(i), (c)(ii) Fe3+ ions present at least once in each of tests (b) and (c) [1]

(b)(ii) and (c)(ii) ppt insoluble (1)

(d) aq. NaOH (1), Al foil (1), warm (1)

ammonia or gas turns litmus blue (1)

Fe(NO3)3 [1]

[Total: 8]

Grade-8

Subject-Chemistry

Work sheet 4 (Identification of Ions )

Name of Student :…………………………………………………. Section………………

1. The following table shows the tests a student did on compound W.

Complete the table by adding the observations for (a), (c) (i) and (c)(ii) and the tests and

observations for tests (b)(i), (b)(ii) and (d).

2. The following table shows the tests a student does on compound Y and the conclusions

made from observations. Complete the table by stating the observations in tests (a), (b)(ii) and (c)(ii), the

conclusions in tests (b) and (c) and both the test and observation in test (d).

1

Grade-10

Subject-Chemistry

Answer sheet 4 (MCQ)

1. C

2. C

3 B

4 D

5 C

6 B

7 B

8 B

9 C

10. A

11. A

12. C

13. B

14. C

15. C

16. A

17. A

18. B

19. D

20. C

21. A

22. C

23. C

24. C

25. D

26. A

27. D

28. A

1

Grade-10

Subject-Chemistry

Worksheet 4

Name of Student :………………………………………………… Section………………

1. A gas Y, is less dense than air, very soluble in water and is an alkali.

Which method is used to collect a dry sample of the gas?

2. Methylamine, CH3NH2 (Mr = 31), and hydrogen chloride, HCl (Mr = 36.5) are both gases which are

soluble in water. The gases react together to form a white solid, methylammonium chloride.

In an experiment to demonstrate rates of diffusion the following apparatus is set up.

Where will the white solid form?

3. 124 g of phosphorus vapour has the same volume as 71 g of chlorine gas at the

same temperature and pressure.

What is the formula of a molecule of phosphorus?

A P8 B P4 C P2 D P

2 4. The diagrams show mixtures of chemicals that react to produce gases.

In which reaction will the litmus paper change colour?

5. Elements X and Y combine to form the gas XY2.

What are X and Y?

6. Which sulphide contains the greatest mass of sulphur in a 10 g sample?

3 7. Substance X liberates iodine from aqueous potassium iodide and decolourises acidified aqueous potassium

manganate(VII).

How is the behaviour of X described?

A as an oxidising agent only

B as an oxidising agent and a reducing agent

C as neither an oxidising agent nor a reducing agent

D as a reducing agent only

8. A piece of metal is to be electroplated.

Which set of conditions give the thickest plate?

9. Nitrogen dioxide, NO2, is a dark brown gas that decomposes as shown by the equilibrium equation.

The diagram shows a glass flask containing a mixture of the three gases.

The mixture is pale brown.

More oxygen is forced into the flask.

What colour change is seen in the mixture?

A there is no change

B it turns colourless

C it becomes darker brown

D it becomes a paler brown

4

10. The equation shows the effect of heat on copper(II) carbonate.

CuCO3(s) → CuO(s) + CO2(g)

A known mass of copper(II) carbonate was placed in an open crucible and heated until no more

change occurred.

The mass of the crucible and contents was weighed every minute during the heating.

Which graph shows what happens to the mass of the crucible and contents?

11. The diagram compares the amount of carbon in two steels, P and Q.

Which two diagrams correctly compare the strength and brittleness of P and Q?

5 12. The following equations represent reactions of dilute sulphuric acid.

Which reaction is not ‘typical’ of a dilute acid?

A 2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)

B CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l)

C Pb(NO3)2(aq) + H2SO4(aq) → PbSO4(s) + 2HNO3(aq)

D ZnCO3(s) + H2SO4(aq) → ZnSO4(aq) + CO2(g) + H2O(l)

13. Why are catalytic converters fitted to car exhausts?

A to decrease the amount of carbon dioxide emitted

B to decrease the amount of nitrogen oxides emitted

C to improve energy conservation

D to reduce global warming

14. A black powder is burned in air.

The gas produced dissolves in water to form solution R. The pH of R is close to 7.

The gas is readily absorbed in aqueous sodium hydroxide.

What type of substance is present in solution R?

A strong acid

B strong base

C weak acid

D weak base

15. An atom of element X is represented by .

Which statement about an atom of X is correct?

A It is in Group III of the Periodic Table.

B It is in Group VII of the Periodic Table.

C The total number of protons and electrons is 6.

D The total number of protons and neutrons is 10.

16. Aluminium sulphate is used in water treatment. Aqueous aluminium sulphate is acidic.

The table shows the results of tests on four different samples of treated water.

To which sample had an excess of aluminium sulphate been added?

6 17. A gas, X, is less dense than air and insoluble in water.

Which method cannot be used to collect the gas?

18. The apparatus shown in the diagram was set up.

Over a period of time how will the water level at X change?

A It will fall, then rise and return to X.

B It will fall and remain at a lower level.

C It will rise, then fall then return to X.

D It will rise and remain at a higher level.

19. Which of the following, when added to water, makes a solution that is a good conductor of electricity?

A calcium carbonate

B copper

C ethanol

D sodium hydroxide

7 20. The table gives information about the ability of four substances to conduct electricity.

What could these four substances be?

What could these four substances be?

21. Apparatus is set up as shown in the diagram.

What occurs at electrode X?

A Chloride ions are oxidised.

B Chloride ions are reduced.

C Nickel ions are oxidised.

D Nickel is deposited.

22. Which statement about the alkali metals is true?

A they form covalent bonds with Group VII elements

B they form oxides on reacting with water

C their melting points decrease on descending Group I

D their reactivities decrease on descending Group I

8 23. Three types of steel have different properties.

steel 1 easily shaped

steel 2 brittle

steel 3 resistant to corrosion

What are the names of these three types of steel?

24. Four experiments on rusting are shown.

Which two experiments can be used to show that air is needed for iron to rust?

A 1 and 3

B 1 and 4

C 2 and 3

D 2 and 4

25. Which of the following methods would not produce ammonia?

A heating concentrated aqueous ammonia

B heating ammonium chloride with calcium hydroxide

C heating ammonium sulphate with sodium hydroxide

D heating ammonium sulphate with dilute hydrochloric acid

26. Aqueous copper(II) sulphate is electrolysed using carbon electrodes.

What happens to the electrolyte?

A It becomes more acidic.

B It becomes more alkaline.

C It turns deeper blue.

D It remains unchanged.

9 27. What is the general formula of the homologous series of carboxylic acids?

methanoic acid HCO2H

ethanoic acid CH3CO2H

propanoic acid C2H5CO2H

butanoic acid C3H7CO2H

A CHO

B CnH2nO

C CnHnOn

D CnH2nO2

28. The repeating units of two polymers, X and Y, are shown below.

What are X and Y?

CLASS:VIII [section A & B]

SUBJECT: MATHEMATICS SYLLABUS D /4024

Topic: Algebra

1 Write down the degree of each of the following terms.

(a)

(b)

(c)

2 Pick out the ´like´ terms in each of the following polynomials.

(a)

(b)

3 (a) Add to

(b) Subtract from

4 Simplify the following polynomials.

(a) + 4

(b)

The end

Edited - Class 8 CC Physics Work on 6th April 2020VIII CC ,Business Studies Work on 6th April 2020VIII CC Chemistry Answer Sheet of HW 6 on April 2020VIII CC Chemistry Home Work on 6th April 2020X CC Chemistry Home work 4 Answersheet on 6th April 2020X CC Chemistry Home work 4 on 6th April 2020VIII_CC_Mathematics-D_work_on_6th_April_2020(1)