Download - TE3 CHP4.1-4.4 SM1(XIN) Chemistry

7/26/2019 TE3 CHP4.1-4.4 SM1(XIN) Chemistry

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CHONG HWA INDEPENDENT HIGH SCHOOL

CHEMISTRY

SENIOR MIDDLE ONE SCIENCE (XIN)

TEST 3

Duration: 60 minutes

(CHAPTERS COVERED: 4.1 4.4 )

Name : _______________________________ ( )Date : _______________________________

Instruction:

i. Answer ALLthe questions in this paper.

ii. As for Paper 2 Section B, write your answer on the test pad.

PAPER 1

[10 marks]

This paper consists of 10 questions. Answer ALL the questions.

1. The following statements refer to the contribution of a scientist in the

development of the Periodic Table.

Who was the scientist?A. Antoine Lavoisier B. Dmitri Mendeleev C. Lothar Meyer D. John Newlands

2. The electron configuration of Z2+ion is 2.8.8. Determine the position of

element Z in the Periodic Table.

A. Group 1, Period 3 B. Group 18, Period 3

C. Group 2, Period 3 D. Group 18, Period 2

3. Which of the following characteristics is similar for all elements in Group 18

of the Periodic Table?

A.

Have high melting and boiling points

B.

Exist as diatomic molecules

C. Exist as gas at room temperature

D.

Dissolves in water to form acidic solution

4. Which of the following is used as laser to control the thickness of plastic in

industry?

A. Helium B. Neon C. Argon D. Krypton

Paper Question Marks Score

1 10

2 (A) 1 9

2 11

2 (B) 3 20

Total 50

Every eighth elements exhibit same properties


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5. Table below shows the nucleon number and the number of neutrons of

element X and Y.

Which statement is correct for both element L and M?

A. Atom L is more electropositive than atom M

B. Element M reacts more vigorously than L in water

C. Element L and M does not react with bromine gas when heated

D. Both the elements, L and M does not conduct electricity and heat

6. Element J is located below sodium. It reacts with bromine vapour to form a

white solid. It was found that element J burnt most vigorous with lilac flame.

What is the product of this reaction?

A. KBr B. NaBr C. LiBr D. FeBr3

7.

Lithium, sodium and potassium react with oxygen followed by water. The

solutions produced turns red litmus paper blue. Why all these elements gave

the same observation?

A. They have the same number of valence electron

B.

They have generally low densities

C. They are highly soluble in water

D. They have the same electropositivity

8. Uis located in the same group as chlorine in the Periodic Table of Elements.

Which of the following are the characteristics of U?I. Exists as diatomic molecules

II.

Has high melting and boiling point

III. It is very electronegative

IV. Conducts electricity

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

9. Ions M, N and O have achieved the stable octet electron configuration with

charge of -1. While reacting with iron wool, O glows dimly and slowly while

N glows most brightly. The reactivity of M, N and O in descending order is

A. M, N, O B. N, M, O C. O, M, N D. O, N, M

10.Iodine gas reacts with sodium hydroxide produces

A. Sodium iodide only

B. Sodium hypoiodite only

C. Sodium iodide and sodium hypoiodite

D.

Sodium iodide, sodium hypoiodite and water

Element Nucleon number Number of neutrons

L 7 4

M 39 20


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PAPER 1 [10 marks]

1 2 3 4 5 6 7 8 9 10

PAPER 2This paper consists of twosections. Answer ALL the questions.

SECTION A

Structur ed Questions

[20 marks]This section consists of two questions. Answer ALL the question.

1. The table below shows the proton numbers, melting points and boiling points

for four elements.

Element Proton number Melting point (oC) Boiling point (oC)

H 3 180 1330

I 10 -248 -246

J 17 -101 -35

K 19 64 759

(a) Identify the element(s) from the table that are in Period 3 of the Periodic Table.

[1]

.......

(b)Explain why elementIhave low melting point and boiling point as compared

to others. [2]

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(c) (i) State the element which is alkali metal. [1]

.......

(ii) Caesium is also one of the alkali metals. Explain why the elements stated

in (c)(i) has higher boiling point than caesium. [2]

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(d)Compare the reactivity of element I and K. Explain your answer. [3]

.......

.......

.......

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2. The diagram below shows three experiments designed to study the chemical

properties of alkali metal. The paraffin oil on lithium, potassium and metalX

were first removed before reacting with oxygen.

(a)Why all the alkali metals were kept in the paraffin oil? [1]

.......

(b)State what could be observed in Experiment II. [3]

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(c)Suggest metalXbased on the observation of Experiment III. [1]

.......

(d)

Write a balanced chemical equation for the reaction in Experiment I. [2]

.......

(e)The products of Experiment I was then dissolved in water and its chemical

property was tested using a red litmus paper.

(i) State the possible observation and suggest its chemical properties. [2]

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(ii) Write a balanced chemical equation for the reaction in Experiment I. [2]

.......

SECTION BEssay Question

[20 marks]This section consists of one question. Answer ALL the question.

Diagram above shows the electron arrangement of of an ion of elementP.

a) Write the electron arrangement of atomP. [1]

b) State and explain the position of elementPin the Periodic Table of

Elements. [5]

c) State two physical properties of elementP. [2]

d)

Explain how the atomic radius changes going down the group to whichelementsPbelongs. [2]

e)

Element Qis placed above elementPin the Periodic Table of Elements.

Both elementPand Qare allowed to mix with water .

(i) Predict the observations that will take place when elementPand Q

mix with water.

(ii) Write the chemical equations involved whenP reacts with water.

(iii) Explain the observations in term of electron arrangement.

[8]

f) Write the chemical equation if element P reacts with bromine gas. [2]

Prepared by: B.Y. Cheong

P