BAB4

Chapter 4 The Variety of Resources on Earth Paper 1 1 Which product is obtained from the air around us? I Dry ice II Neon lights III Sunlight IV Heat A I and II only B III and IV only C I, II and III only D I, II, III and IV 2 Which of the following are resources needed by both plants

and animals? I Soil II Air III Water IV Living things A I and II only B II and III only C I, II, and III only D I, II, III and IV 3 Why is water an important resource? A It cover three quarters of the Earths surface B It supports all living things C It is made up of hydrogen and oxygen D It is a compound 4 Which of the following is a mixture? I Air II Water III Oxygen IV Soil A I and IV only B II and III only C I, II and III only D I, II, III and IV 5 Matter J K L (Example: Air) (Example: Water) (Example: Tin) What do J, K and L represent in the figure above?

J K L A Elements Compounds Mixtures B Compounds Elements Mixtures C Mixtures Elements Compounds D Mixtures Compounds Elements

6 Which of the following statements classifies carbon as a metal

or non-metal correctly? A Carbon is a non-metal because it cannot conduct

electricity B Carbon is a metal because it conducts electricity C Carbon is a non-metal because it is brittle D Carbon is a metal because it has a relatively high boiling

point 7 Which of the following statements correctly describes gold? I It is a metal II It is rare III It is yellowish IV It conducts heat and electricity A I and IV only B II and III only C I, II and III only D I, II, III and IV 8 Which method cannot be used to separate a mixture into its

constituents? A Electrolysis B Filtration C Evaporation D Using a sieve 9

What is the best way to separate the constituents in the mixture shown in the figure above?

A Use a separating funnel B Dissolve the mixture in water, then let it evaporate to

dryness C Use a magnet D Dissolve the mixture in water, and then filter it 10 How can iron nitrate be separated into its constituents? A By conducting an electrical current through the solution B By using a separating funnel C By using a magnet D By using a filter funnel 11 Among the following properties of mixtures, which are matched correctly?

I Dessert consists of two or more substances which are physically combined

II Water and oil can be separated by using separating funnel

III IV

Petroleum can be separated by distillation Alloy can be separated by electrolysis

A I. II. III. IV B I, II, III C I, II, IV D I, III, IV

12 Is light, does not rust and a good conductor of heat Use as framework of planes, drink can, kettle and pans

The above statements are suitable for

A Mercury B sulphur C Aluminium D Silver

13

Which of the following statements is incorrect to describe the final result of the experiment?

A A black coloured substance is formed B Iron filling and sulphur powder are chemically

combined C No new substance is formed D The original properties are completely changed

14 One spatula of iron filling and one spatula of sulphur powder are mixed together to form a mixture as shown in the diagram above.Choose the correct statement to describe the result.

A No new substance is formed B The mixture turned black C Heat is absorbed D Heat is released

Paper 2 1 (a) How are metals and non-metals different from the following

aspects? (i) electrical conductivity

(ii) malleability

. (iii) surface appearance

. (iv) melting points

. (b) Classify the following as metals or non-metals correctly.

Metal Non-metal

2 Diagram 1.1 shows three pictures of different substances, P , Q and R . P Q R ( a ) ( i ) On Diagram 1.1, label the substance P , Q and R with the

following words. ( b ) Based on Diagram 1.1 above , state one example of substances

Q and R. i. Substance Q :

ii. Substance R :

( c ) ( i ) Match the pictures in Diagram 1.1 with their arrangement of particles.

Picture Arrangement of particles

3. Diagram shows the models of four substances P , Q , R and S. ( a ) On diagram ,label the substances P, Q, R and S with the following words.

Oxygen Iron oxide Carbon dioxide Sulphur

( b ) State what is element.

4. Diagram 4.1 shows a substance classification chart. ( a ) What is represent Q ?

( b ) Give an example of

P:

R: ( c ) Give one characteristic of R ?

( d ) Draw in diagram 4.2 to show the differences between P and Q.

5. Diagram shows an experiment to study the properties of a mixture and a compound containing the same elements.

copper zinc mercury carbon silicon sodium sulphur naphthalene

P _________

Q _________

R _________

S _________

a ) What will you observe when a magnet is placed close to the mixture of iron fillings and sulphur in (A)?

( b ) i. Is the observation the same as (b) when a magnet is placed close to the iron filings and sulphur that was heated in (B)?

ii. What inference can you make from the observation in (c) i?

( c ) Write a word equation to show the reaction which takes place when heating a mixture of iron fillings and sulphur.

( d) Name two compounds that are found in your surroundings.

1. ..

2. .

6. Diagram 7 shows several pictorial representations of elements, compounds and mixtures. Each circle represents a type of atom. Two atoms are bounded together if they touch one another.

K L M N

Section B ( a ) Based on the labels in Diagram 7, classify the pictorial representations K, L, M and N in Table 7. 2

( b ) What is the difference between a compound and a mixture?

( c ) Explain why sugar is classified as a compound but a sugar solution is classified as a mixture. .

.

( d ) Suggest a method of separating the a mixture of sulphur and iron fillings.

7. Diagram shows the apparatus used to study a physical property of some elements. Each of the element is connected across the circuit in turn and the switch is turned on. The results of the experiment are shown in Table 1. ( a ) Based on your observation in Table 1, classify the elements P,Q,R,S and T into two groups. 8. Diagram shows a picture of a beaker of water. 8

The apparatus above can be used to separate a mixture of oil and water. a. Name the apparatus (________________________) b. Give two properties of oil that enable it to be separated from water. i. ____________________________________________________ ii. ____________________________________________________ c. Mixture can be separated physically. Suggest another two

physical methods that can be used. i. __________________________________ ii. __________________________________