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Chapter 4 - The Variety Resources On Earth 1. Diagram 1.1 shows three pictures of different substances, P , Q and R .

P

Q

R

Diagram 1.1

( a ) ( i ) On Diagram 1.1, label the substance P , Q and R with the following words.

Mixture Compound Element

( 3 marks )

( b ) Based on Diagram 1.1 above , state one example of substances Q and R. i. Substance Q : ……………………………………………………………….

ii. Substance R : ………………………………………………………………

( 2 marks )

water

Iron nail

air

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

Diagram 1.1

( 3 marks )

Picture Arrangement of particles

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ii. Diagram 1.2 shows a picture of a beaker of water.

Diagram 1.2

Water is a compound.

Which of the following is a method to separate the composition of water ?

Tick ( √ ) in the box provided.

( 1 mark )

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2. Diagram 2.1 shows three pictures of different substances, M , N and O .

M

N

O

Diagram 2.1

( a ) ( i ) On Diagram 2.1, label the substance M , N and O with the following words.

Mixture Compound Element

( 3 marks )

( ii ) Based on Diagram in 2 ( a ) ( i ) , what is the method to separate substance M ? …………………………………………………………………… ( 1 mark ) ( b ) Diagram 2.2 shows pictures of iron nail.

Diagram 2.2

An iron nail is a metallic substance.

State one characteristic of metallic substance.

…………………………………………………………………………………….

( 1 mark )

water

soil

Iron nail

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( c ) Diagram 2.3 shows the arrangement of the particles of substances K and L.

K

L

Diagram 2.3

( i ) On Diagram 2.3 , label the substance K and L with the following words.

Compound Element ( 2 marks )

( ii ) Based on Diagram 2.3 above , state one example of substances K and L.

( i ) Substances K : …………………………………………………………..

( ii ) Substances L : …………………………………………………………..

( 2 marks )

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3. Diagram 3.1 shows the models of four substances P , Q , R and S.

P : _______________________

Q : ________________________

R : ________________________

S : ______________________

Diagram 3.1 ( a ) On diagram 3.1 ,label the substances P, Q, R and S with the following words.

( 4 marks ) ( b ) State what is element. ………………………………………………………………………………………

………………………………………………………………………………………

( 1 mark )

Oxygen Iron oxide Carbon dioxide Sulphur

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( c ) Draw lines to match substances P ,Q, R and S to their various forms in nature.

( 2 marks ) ( d ) State two examples of mixture.

i. …………………………………………………………………………………. ii. ………………………………………………………………………………….

( 2 marks )

( e ) State one method to separate a mixture. …………………………………………………………………………………………

( 1 mark )

P

Q

R

S

Elements

Compounds

Mixtures

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4. Diagram 4.1 shows a substance classification chart.

Diagram 4.1

( a ) What is represent Q ? ………………………………………………………………………………..

( 1 mark ) ( b ) Give an example of

P: …………………………………………………………………………… R: …………………………………………………………………………… (2 marks)

( c ) Give one characteristic of R ? ………………………………………………………………………………… ………………………………………………………………………………..

( 1 mark )

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

P Q

( 2 marks )

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5.

Diagram 5.

( a ) Based on diagram 5 above, classify K,L,M and N in the table below

Table Representation Compound Elements of single atoms Elements made of molecule Mixture of two compounds

( 4 marks )

( b ) State the difference between a mixture and a compound

………..…………………………………………………………………………. ………..…………………………………………………………………………. (2 marks)

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

……….………………………………………………………………………….. ……….………………………………………………………………………….

(2 marks)

( d ) Suggest one method to separate the crude oil

…………………………………………………………………………………. (1 marks )

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6. Diagram 6 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.

Diagram 6

Elements Observations P Bulb lights up. Q Bulb lights up. R Bulb does not light up. S Bulb lights up. T Bulb does not light up.

Table 6

( a ) Based on your observation in Table 1, classify the elements P,Q,R,S and T into two groups.

P, Q, R,S,T

Types of element

Letters of elements

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( 4 marks )

7. 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

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

Label Representation

Element of single atoms

Element made of molecules

Compound

Mixture of two compounds

( 4 marks )

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

……………………………………………………………………………………

……………………………………………………………………………………

(2 marks)

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

classified as a mixture.

…….…………………………………………………………………………………

…….…………………………………………………………………………………

(1 mark)

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

……………………………………………………………………………………. (1 mark)

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8. Diagram 8 shows an experiment to study the properties of a mixture and a compound containing the same elements.

Diagram 8

( a ) What will you observe when a magnet is placed close to the mixture of

iron fillings and sulphur in (A)?

……………………………………………………………………………………. (1 mark)

( 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)?

……………………………………………………………………………..

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

…………………………………………………………………………… (2 marks)

( c ) Write a word equation to show the reaction which takes place when

heating a mixture of iron fillings and sulphur.

……………………………………………………………………………………. (1 mark)

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

1. ………………………………………………..…………………………………… 2. ……………………………………………………………………………………..

(2 marks)