Name:__________________________________________ Form: 4 ST

QUIZ 1

[40 marks]Answer all questions in 60 minutes.

Particle(zarah)

No of Protons(Bilangan Proton)

Number of neutrons(Bilangan neutron)

Number of Electrons

(Bilangan elektron)V 3 4 2W 6 6 6X 11 12 10Y 17 18 18Z 18 20 18

Table 1

1. Table 1 shows the number of proton, neutron and electron for particle V, W, X, Y and Z. based on information given in Table 1, answer the following questions.

a. What is the charge for particle X?

___________________________________________________________ [1 m]

b. What is the nucleon number for particle W?

___________________________________________________________ [1 m]

c. Write the electron arrangement for atom V : _____________________

Z : _____________________ [2 m]

d. Draw the electron arrangement for particle

(i) X [1 m]

(ii) Y [1 m]

Diagram 1

2. Diagram 1 shows electrons arrangement for deferens 4 particles. a) State the number of protons for the particles below :

(i) M : ____________________

(ii) J : ____________________

[2 m]

b) Write the electron arrangement for atom S

____________________________________________________________________

[1 m]

c) Write the electron arrangement when J particle is stable

____________________________________________________________________

[1 m]

3 (a) Diagram 1.1 shows the set up of the apparatus used in an experiment to determine the freezing point of substance X.

Diagram 1.1

(i) Name one example of substance X.

………………………………………………………………………………… [1 mark]

(ii) Why is the boiling tube must be placed in a conical flask?

………………………………………………………………………………… [1 mark]

JZM2+

S+

ThermometerTermometerBoiling tubeTabung didih

Substance XBahan X

Conical flaskKelalang kon

(iii) Why is the substance X must be stirred continously during cooling

process?

………………………………………………………………………………. [1 mark]

(b) Diagram 1.2 shows a graph of temperature against time when

substance X is cooled.

Diagram 1.2(i) What is the freezing point of substance X?

……………………………………………………………………………… [1 mark]

(ii) State the physical state of substance X at point B.

…………………………………………………………………………….... [1 mark]

(iii) Compare the kinetic energy of particles at points A and B.

……………………………………………………………………………… [1 mark]

(iv) Why does the temperature remains constant at point B?

……………………………………………………………………………….... [1 mark]

(v) Draw the arrangement of particles of substance X at 60oC and 90oC.

60oC 90oC

[2 marks]

Time/minMasa /min

Temperature / oC Suhu / oC

90

80

60

A

B

C

4. Table 2 shows the number of protons and neutrons of four atoms.

Atom Number of protons Number of neutronsW 3 4X 16 17Y 16 16Z 19 20

Table 2a) (i) What is meant by the proton number and nucleon number of an atom?

...........................................................................................................................

………………………………………………………………………………… [2 marks]

ii) State the proton number and nucleon number of atom W.

...................................................................................................................... [1 mark]

b) Represent atom X in the form of [1 mark]

(c) Matter can be divided into three particles; that are atoms, molecules and ions. Give an example of each particle and explain the meaning of

Jirim boleh dibahagikan kepada tiga jenis zarah; iaitu atom, molekul dan ion. Berikan satu contoh bagi setiap zarah dan terangkan apakah yang dimaksudkan dengan

(i) atom atom

(ii) ion ion

(iii) molecule molekul

[6 marks]

5. The meeting point of Substance R was determined by using the heating method. The

graph of temperature against time was plotted as shown below.

Takat lebur sebatian J ditentukan menggunakan kaedah pemanasan. Graf suhu melawan masa diplotkan seperti di bawah

Temperature/ oC 90

80

70

60

50

40

30

Time/minute5 10 15 20 25 30 35

Figure 1 (a) (i) What is the melting point of Substance R with reference to the figure 1.

…………………………………………………………………………………………[1 marks]

(ii) Draw and label the set-up of apparatus for heating process.

[2 marks]

(b) State the physical state of Substance R at the section of the curve

( i) 0 to 5 minutes

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

(ii) 10 to 20 minutes

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

[2 marks](c) Explain why there is no change in the temperature from the10th to 25th minutes.

……………………………………………………………………………………………... [2 marks]

(d) Draw a diagram to show the arrangement of particles R at a temperature of 80oC.

[1mark]

(e) Explain why the melting point of substance R cannot be determined by method of heating it directly?

………………………………………………………………………………………...…[ 1 mark]

(f) A compound S has a melting point of -14oC and a boiling point of 124oC, what is thephysical state of S at a temperature of 135oC?

……………………………………………………………………………………………[ 1 mark]

(g) What is isotope?

..............................................................................................................................................[1 mark]

[End of Question Paper]