TT2.1_Ionic and Covalent Bond (1)

7/24/2019 TT2.1_Ionic and Covalent Bond (1)

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PENABUR INTERNATIONAL TANJUNG DUREN

CHEMISTRY TAKE HOME TEST

NAME:_________________________ CLASS:_____________________

SECTION A: MULTIPLE CHOICE QUESTIONS (25 POINTS)

1. Substance X has a melting point higher than 500oC. It is insoluble both in water and in

organic solvents. It conducts electricity when both solid and molten.

What is X?

Acopper

B mercury

Cpoly(ethene)

D sodium chloride

2. For which compound is the type of bonding correct?

3.

Why do graphite and diamond have different physical properties?

ADiamond has a giant molecular structure but graphite has not.

BDiamond occurs naturally but graphite is made artificially.

CGraphite is ionic whereas diamond is covalent.DThey contain carbon atoms covalently bonded to different numbers of other carbon

atoms.

4. Silicon carbide, SiC, has a structure similar to diamond. Boron nitride, BN, has a structure

similar to graphite. Bronze is an alloy of copper and tin.

Which statements about SiC, BN and bronze are correct?

1All are bonded covalently.

2All except silicon carbide conduct electricity when solid.

3All have high melting points.

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3

5. Which molecule contains a total of three covalent bonds?

A C2H4

B H2

CH2O

DN2


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6. The diagram shows some elements in Groups III, IV and V of the Periodic Table.

Which two elements would be expected to form an oxide of the type XO2?

7. The proton number of element X is 6. The proton number of element Y is 9.

What is the formula of a compound of these elements?

A X2Y3 BX3Y2 CXY3 DXY4

8. What is the structure of sand?

Aa macromolecule

Ban ionic lattice

Ca polymer

Da simple molecule

9. Below are two statements about metals.

1 Metals contain a lattice of negative ions in asea of electrons.

2 The electrical conductivity of metals is related to the mobility of the electrons

in the structure.

Which is correct?

ABoth statements are correct and statement 1 explains statement 2.

BBoth statements are correct but statement 1 does not explain statement 2.

CStatement 1 is correct and statement 2 is incorrect.

DStatement 2 is correct and statement 1 is incorrect.

10.Which compound contains three elements?

Aaluminium chloride

Biron(III) oxide

Cpotassium oxide

Dsodium carbonate

11.

In the molecules CH4, HCl and H2O, which atoms use all of their outer shell electrons in

bonding?

AC and Cl BC and H C Cl and H DH and O


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12.Which gases have molecules that contain one or more double/triple covalent bonds?

Carbon

dioxide

Nitrogen

(N2)

Hydrochloric

Acid

A

B X

C X

D X X

13.Which substance conducts electricity?

ACO2(g) BNaCl (s) CNaOH(aq) DS(s)

14.Sodium chloride is an ionic salt that is used industrially as an electrolyte to conduct

electricity.

Under which conditions does sodium chloride behave as an electrolyte?

15.

An oxide of lead is changed to lead by heating it with carbon.

What is the formula of this oxide of lead?

APb2O3 BPb3O2 CPb3O4 DPb4O3

16.Which two elements combine to form an ionic compound?

Acarbon and oxygen

Bchlorine and magnesium

Ccopper and zinc

Dhydrogen and oxygen

17.

Which displayed formulae correctly represent a molecule of carbon dioxide and of

nitrogen?

18.Which two elements form covalent bonds when they combine with each other?

Acalcium and oxygen

Bhydrogen and oxygen

Cmagnesium and chlorineDsodium and chlorine


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19.The atoms of three elements have the symbols 8X, 9Y and 10Z.

Which types of bond form between these elements?

20.The diagram shows the structure of hydrogen peroxide.

What is the total number of electrons used for bonding in this molecule?

A 3 B 4 C 6 D 8

21.

The diagram shows the arrangement of electrons in a molecule of compound YZ2.

What are elements of Y and Z?

22.

The salt ammonium dichromate(VI) readily decomposes when heated.

Which values of x and y make this equation balanced?


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23.The symbols and electronic structures for some elements are shown below.

Which formula is correct for a compound containing silicon?

24.Hydrogen and sulfur react to form the compound hydrogen sulfide.

Which row shows the type of bonding between hydrogen and sulfur and the electrical

conductivity of liquid hydrogen sulfide?

25.Which feature of a metals structure is responsible for it conducting electricity?

A It contains positive ions.

B It has a sea of electrons.

C Its ions are tightly packed together.

D Its positive ions attract electrons.


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SECTION B: MULTIPLE CHOICE QUESTIONS (50 Points)

1. Change these following words equations into balancechemical equations.

A. Phosphorous pentachloride reacts with water to produce hydrogen chloride and

hydrogen phosphate. [4]

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B. When lead (II) nitrate is heated it will decompose into lead (II) oxide, nitrogen

dioxide and oxygen [4]

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C. Sodium carbonate reacts with hydrochloric acid to produce sodium chloride, water

and carbon dioxide [5]

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D.

Copper and sulphuric acid react to form copper (II) sulphate and water and sulphur

dioxide. [5]

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[Point: 18]

2. Give name of each of the following compounds.

A. BaCO3________________________

B.

(NH4)2SO4____________________

C. UO2___________________________

D. Mg3N2________________________

E. NH3__________________________

F. Fe3(PO4)2______________________

G.

P2S3___________________________

H. V(NO3)5_______________________

I. CdCl2__________________________

J. HNO3___________________________

[Total: 5]


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3. Oxygen and sulphur are from group VI. They have similar chemical properties.

A. Oxygen forms a covalent bond with carbon. Draw a diagram showing the

arrangement of the valence electrons in one molecule of the covalent compound

carbon dioxide.

Use xto represent an electron from an atom of carbon.

Use oto represent an electron from an atom of oxygen.

[3]

B. Sulphur forms an ionic bond with potassium. Draw a diagram which shows the

formula of this ionic compound, the charges on the ions and the arrangement of

the valence electrons around the negative ion.

Use o to represent an electron from an atom of potassium.Use xto represent an electron from an atom of sulphur.

[3]

C. Predict two differences in physical properties of those two compounds. [2]

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[Total: 8]

4. Germanium is an element in Group IV. The electron distribution of a germanium atom is

2 + 8 + 18 + 4. It has oxidation states of +2 and +4.

Silicon is also an element in Group IV, with oxygen it will form giant covalent molecule of

Silicon (IV) oxide.

A. Draw a diagram showing the arrangement of the valency electrons in one molecule

of the covalent compound germanium (IV) chloride, GeCl4.

Use oto represent an electron from a chlorine atom.

Use xto represent an electron from a germanium atom.

[3]


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B. Describe the structure of the giant covalent compound germanium (IV) oxide, GeO2.

It has a similar structure to that of silicon (IV) oxide. [2]....................................................................................................................................

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C.

A section of the macromolecular structure of silicon(IV) oxide is given below

Use this diagram to explain why the formula is SiO2not SiO4. [2]

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[Total: 7]

5. Diamond and graphite are made up from carbon. They are in a form of giant covalent

molecules. Below are the structure of diamond and graphite.

A.

Draw a table and describe two differences of diamond and graphite structures. [4]


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B. Explain why diamond is a very hard substance [2]

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C. Explain why graphite is slippery and soft [2]

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D. Explain why graphite can conduct electricity while diamond cannot. [2]....................................................................................................................................

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E. Give each one use of diamond and graphite [2]....................................................................................................................................

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[Total: 12]

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TT2.1_Ionic and Covalent Bond (1)