FORM TWO CHEMISTRY TOPICAL QUESTIONS WITH ANSWERS
CHAPTER : 7  FORMULA BONDING AND NOMENCLATURE
1

The process of coating iron or steel with zinc is known as:

  1. zinc painting.
  2. alloying.
  3. tin plating.
  4.  galvanization.
Choose Answer :

2

The empirical formula of certain compound in CH3. Its molar mass is 30 g. What will be its molecular formular?

  1. CH4
  2. C2H4
  3. C2H6
  4. C2H8
  5. C4H12
Choose Answer :

3

The simplest formula of a compound formed when combining 36 g of magnesium and 14 g of nitrogen is:

  1. MgN
  2. Mg2N
  3. Mg3N2 
  4. MgN2
  5. Mg4N2
Choose Answer :

4

What is the oxidation state of Chlorine in KCIO3?

  1. +2
  2. -5
  3. +5
  4. +3
Choose Answer :

5

The simplest formula of a compound formed when combining 13g of aluminum and 17g of chlorine is:

  1. AlCl
  2. Al2Cl
  3. Al3Cl2
  4. AlCl3
Choose Answer :

6

Which net charge exists in radicals?

  1. Zero
  2. Positive or negative
  3. Neutral
  4. Positive and negative.
Choose Answer :

7

What is the IUPAC name for H2S04 ?

  1. Sulphuric acid
  2. Sulphuric (VI) acid
  3. Hydrogen sulphate
  4. Dihydrogen sulphate
  5. Hydrogen tetrasulphate
Choose Answer :

8

How many atoms are there in a water molecule

  1. Two
  2. Three
  3. Four
  4. Five
Choose Answer :

9

Carbon has two main isotopes, 12 C and 14 C with relative abundance of 98.89% and 1.11% respectively. Calculate the relative atomic mass of carbon.

  1. 13.5
  2. 12.01
  3. 6
  4. 27
Choose Answer :

10

In the formula of the compound F2K3 the valences of F and K are respectively:

  1. 2 and 3     
  2. 3 and 2
  3. 4 and 6         
  4. 6 and 4
Choose Answer :

11

Given that, element “M” with electronic configuration of 2:8:3 combines with element “G” with electronic configuration of 2:6 to form a compound; What is the chemical formula of the compound formed.

  1. G3M2
  2. M2G3
  3. G2M3
  4. M3G2
Choose Answer :

12

A covalent bond is formed when

  1.  a metal combines with a non­metal
  2.  potassium and oxygen combine
  3.  ammonia is formed
  4.  two metals combine
  5.  atom looses an electron.
Choose Answer :

13

   The pair elements which is most likely to form a covalent bond when  they react together is:

  1. Carbon and oxygen
  2. Magnesium and potassium
  3. Nitrogen and aluminium
  4. Sodium and oxygen
Choose Answer :

14

   A calcium ion (Ca2+) differs from calcium atom (Ca) because a calcium ion has:

  1. Less electrons
  2. Less protons
  3. More electrons
  4. More neutrons
Choose Answer :

15

(b) An organic compound P consist of 52.2% of carbon, 13% of hydrogen and 34.8% of oxygen. The vapour density of P is 23. Calculate the molecular formula of the compound P and write possible isomer(s) from the molecular formula determined.

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16

(c) Sodium is a solid while chlorine is a gas at room temperature although they are in the same period in the periodic table. What is the cause of this difference? (3 marks)

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17

(b) What is the oxidation number of iron in iron (III) chloride? (3 marks)

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18

7. (a) Differentiate empirical formula from molecular formula. (2 marks)

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19

(b) Calculate the percentage composition by mass of water in a hydrated magnesium chloride MgCl2•6H 2O.  (3 marks)

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20

(c) Calculate the empirical formula for a compound with the following composition: lead 8.32 g, sulphur 1.28 g, oxygen 2.56 g (relative atomic wt of lead = 207, sulphur = 32, oxygen = 16) (5 marks)

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21

(b) Write down the formulae of the simplest compounds you would expect when

(i) A and B combine chemically

(ii) C and D combine chemically. (2 marks)

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22

 (c) (i) What types of bonding you would expect to occur in each of the compounds formed in (b)

(ii) List three (3) differences in properties you would expect to find between the compounds in (i) as a result of their difference in types of bonding. (4 marks)

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23

9. A certain gaseous compound contains 30.4% of nitrogen and 69.6% of oxygen by mass. If the molar mass of the compound is 92, calculate its molecular formula. 

Stage

Nitrogen

Oxygen

 

 

………………… ………………… ………………

………………… …………………… …………… 

…………………… …………………… …………

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24

(a) A Form IV student was asked to react phosphate ion and sodium ion forming compound W. Suggest the IUPAC name of W and find the oxidation state of phosphorous in W.

(b) Calculate the percentage composition of lead in the compound Pb(N03)2. (7 marks)

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25

10.(a) Define the following terms:

(i)Valency

(ii)Oxidation state

(iii) Anion

(iv)Cation

(b) Calculate the oxidation state of the underlined elements in the following radicals:

(i) NH4+

(ii) SO42+

(iii) CLO3-

(c) A compound consists of 40% carbon, 6.67% hydrogen and 53.33% oxygen. If its relative molecular mass is 60, calculate the following:

(i)Empirical formula

(ii)Molecular formula

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26

give the IUPAC name of the compound. (7 marks)

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27

10.. (a) The diagram below shows the bonding between two elements A and B.

(i)Write the valence of B.

(ii)Identify the valence of A.

(iii)State the type of bonding formed between A and B.

(iv)Write the formula of the compound formed by A and B.

 (b) Write the formula of the compound formed by the combination of:

(i) NH4+ and SO 2-

(ii) Na+ and C032-

(c)State the number of atoms of each element in CaCl2.

(d)Calculate the oxidation state of sulphur in SO 2-.

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28

(b)Write the chemical formula for each of the following compounds:

(i)Sodium sulphate

(ii)Sodium chloride ..

(iii)Calcium nitrate ......... (iv) Calcium oxide .

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29

2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B
  1. Group of elements which react quickly with water to form alkaline solution.
  2. The ability of an atom to attract an electron.
  3. Group of elements in which their shells are completely filled up.
  4. A vertical column of elements in the periodic table.
  5. Group element which react slowly with water to form alkaline solution.
  6. Group of elements which react with metals to form salts.
  7. Group of elements which react by receiving electrons.
  8. The systematic arrangement of elements according to their increase in atomic numbers.
  9. Group of elements with high densities and melting points, and often act as catalysts.
  10. Group of elements which have both metallic and non-metallic characteristics.

A. Metalloids

B. Non-metals

C. Periodicity

D. T r a n s i t i o n

elements

E. Electronegativity

F. Alkali metals

G. Halogens

H. Periodic law

I. Alkali earth metals

J. Rare non metals

K. Period

L. Noble gases

M. Periodic table

N. Group

 

 

 

 
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30

5.Write the name of each of the following compounds:

(i)(NH4)2C03

(ii)CaCl2

(iii) NaSO4

(iv) KC103

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31

(b)Give three differences between the following:

(i)   Electrovalent compounds and covalent compounds. (ii) Solutions and suspensions.

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32

(b) Calculate the molar mass of each of the following compounds:

(ii) NaHC03                        (iii) Fe203

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33

10.Define the following terms:

(i)Empirical formula .........

(ii)Molecular formula .........

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34

(b)A compound consists of 85.7% carbon and 14.3% hydrogen by mass. If its relative molecular mass is 56, calculate:

(i)Empirical formula.

(ii)Molecular formula.

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35

(b)      Write the chemical formula for each of the following compounds:

(i)Sodium sulphide

(ii)Beryllium chloride

(iii)Copper (I) oxide

(iv)Potassium oxide

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36

5.Write the name of each of the following compounds:

(i) Cuo (ii) PC13 (iii) N204

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37  Calculate the molar mass of each of the following compounds: (i) Na3P04

(iii) caC03

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38

10.(a) Define the following terms:

(i)Covalent bond

(ii)Electrovalent bond

(b)      A compound consists of 82.8% carbon and 17.2% hydrogen by mass. The vapour density of the compound is 29. Calculate:

(i)Empirical formula.

(ii)Molecular formula.

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39

3. (a) What do you understand by the following terms?

(i) Emperical Formula

(ii) Relative atomic mass

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40

(b)      A certain compound K contains 15.8% carbon and 84.2% sulphur. The molar mass of K is 76g/mol. Determine its:

(i)       simplest formula ... ......

(ii)     molecular formula .........

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41

 Write the chemical formula for each of the following compounds:

(i)Sodium carbonate

(ii)Calcium nitrate

(iii)Ammonium chloride

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42

5. Calculate the percentage by composition of the underlined elements in the following compounds: (i) Na2S04

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43

(b)State the method which will be used to protect each of the following from rusting:

(i)Covering iron sheets with a layer of most reactive metals (ii) Bicycle chain

(c)  Find the oxidation number of the underlined elements in the following:

(i)Mn04

(i) K2C%07

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44

8.An experiment showed that 13.88g of calcium chloride were obtained from the combination of 5g of calcium with unknown relative mass of chlorine.

(i)What is the simplest formula of calcium chloride .

(ii)What kind of bond exists between calcium and chlorine?

(iii)Give two properties of the bond you have mentioned in (ii) above.

(b)      Define the following terms as applied in Chemistry

Decantation

Filtration

(iii)Picking

(iv)Funnel Separation

(c) (i)Which is the most abundant element on the earths outer crust? (ii) The term used for acidic chemicals which can burn your skin is

(iii) Give the name of a flame which forms soot .........

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45

 (a) Why do atoms combine?

(b)A metal Z atomic number 12 combines with chlorine to produce a metal chloride. By means of diagrams illustrate the arrangement of electrons in Z before and after the reaction.

(c)An atom X of atomic number 14 combines with chlorine to form a chloride. What type of bond will be formed between the atoms?

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46

4           What do you understand by the term "valency"?

(b) Calculate the oxidation number of the underlined elements: (i) NaOH

(i) CO3

(iii) Na3P04

(v) S02

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47

7.(a) Define the term "empirical formula".

(b) An organic compound contains 26.7% carbon, 2.2% hydrogen and

71.1% oxygen. If its relative molecular mass is 90, determine its:

(i)Empirical formula

(ii)Molecular formula

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48

(a)Give two reasons why water is a compound.

(b) Write IUPAC names for each of the following compounds: 

(i) cac03

(ii) Al2(SO4)3

(iii) NaHC03

(iv) Mg(NO)2

(v) KCI

(c) Describe a chemical test for water.

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49

(a) Differentiate empirical formula from molecular formula

(b)A Form Two student found a bottle of chemical in the laboratory with the following percentage composition by mass; Na=24.47%, C=3.12%, O=25.49% and H2O=46.92%. Determine the empirical formula of the compound.

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50

10. (a)Construct a diagram to show the arrangement of the outer electrons in each of the following molecules:

  1. Chlorine
  2. Ammonia
  3. Carbon dioxide

(b)What type of bond exists in the molecules in part (a)?

(c)Identify four properties of the molecules in part

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51

(b) You are provided with a compound composed of 22.2% zinc, 11.6% sulphur, 22.3% oxygen, and the rest percentage is water of crystallization. Calculate the molecular formula of the compound if its molecular mass is 283. (7 marks)

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52

 (b)Find the oxidation state of sulphur in the sulphate ion, SO 24? .

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53

7. (a) Determine the empirical formula of a substance that has the following composition by mass; 49.5% oxygen.

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