KCSE Chemistry Practice

Question 1

What is the charge of an electron?

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Question 2

Which of the following elements is a noble gas?

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Question 3

What type of bond is formed when two atoms share electrons?

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Question 4

Which state of matter has a definite shape and volume?

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Question 5

In the reaction 2H₂ + O₂ → 2H₂O, what are the reactants?

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Question 6

What is the molar mass of water (H₂O)? (H=1, O=16)

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Question 7

Which of the following is a characteristic of acids?

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Question 8

During a redox reaction, what happens to the substance that is oxidized?

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Question 9

What is the function of the salt bridge in an electrochemical cell?

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Question 10

How does increasing temperature affect the rate of a chemical reaction?

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Question 11

At equilibrium in a closed system, which statement is true?

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Question 12

Which non-metal forms acidic oxides?

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Question 13

Which property is characteristic of transition metals?

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Question 14

What is the functional group present in alcohols?

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Question 15

Which type of polymerization involves the repeated addition of monomers without the loss of any atom?

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Question 16

Which particle determines the identity of an element?

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Question 17

Which group in the periodic table contains elements that are most reactive metals?

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Question 18

Which type of bond is present in sodium chloride?

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Question 19

What happens to the volume of a gas when temperature increases at constant pressure?

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Question 20

What is the coefficient of oxygen when the equation C₃H₈ + O₂ → CO₂ + H₂O is balanced?

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Question 21

How many moles of oxygen gas are needed to completely react with 3 moles of hydrogen gas in the reaction 2H₂ + O₂ → 2H₂O?

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Question 22

Which of the following is a strong base?

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Question 23

In a redox reaction, what is the oxidizing agent?

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Question 24

What type of electrode is used as the site of reduction in an electrochemical cell?

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Question 25

How does increasing concentration of reactants affect reaction rate?

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Question 26

What is the effect of a catalyst on the position of chemical equilibrium?

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Question 27

Which acid is commonly found in vinegar?

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Question 28

Which element has atomic number 12?

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Question 29

What is the electron configuration of the element with atomic number 8?

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Question 30

Which group of the periodic table contains halogens?

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Question 31

Which property is typical of ionic compounds?

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Question 32

Which of the following gases exerts the greatest pressure at the same temperature and volume?

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Question 33

What is the oxidation state of sulfur in H₂SO₄?

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Question 34

Which transition metal is commonly used as a catalyst in the Haber process?

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Question 35

What type of isomerism occurs when two compounds have the same molecular formula but different structural formulas?

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Question 36

Which polymer is formed by the addition polymerization of ethene?

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Question 37

Which particle has negligible mass but a negative charge?

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Question 38

Which element in period 3 has the highest electronegativity?

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Question 39

What type of bonding is present in metallic substances?

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Question 40

What is the shape of a water molecule?

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Question 41

Which state of matter has particles with the highest kinetic energy?

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Question 42

In the reaction 2Al + 3Cl₂ → 2AlCl₃, how many moles of chlorine gas react with 4 moles of aluminum?

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Question 43

Which of these is a property of bases?

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Question 44

Which element is used as the standard electrode in electrochemistry?

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Question 45

Which factor does NOT affect the rate of chemical reaction?

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Question 46

Which statement about chemical equilibrium is true?

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Question 47

Which acid is a strong acid?

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Question 48

Which of the following is an example of a hydrocarbon?

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Question 49

Which polymer is formed from amino acid monomers?

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Question 50

What is the main difference between isotopes of an element?

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Question 51

Which element is a halogen?

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Question 52

Which of the following has a metallic bond?

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Question 53

What is the effect of pressure on the equilibrium position of N₂ + 3H₂ ⇌ 2NH₃?

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Question 54

What is the molecular formula of ethanoic acid?

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Question 55

Which of the following is a condensation polymer?

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Question 56

Which is the correct order of increasing atomic radius in period 3 elements?

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Question 57

Which compound will conduct electricity when molten but not when solid?

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Question 58

What is the main intermolecular force in water?

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Question 59

Which of the following is NOT a property of transition metals?

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Question 60

Which functional group contains a carbon double bonded to an oxygen and single bonded to a hydroxyl group?

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Question 61

What is the primary structure of a protein?

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Question 62

Which of the following is a characteristic of metals?

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