Rate of reaction

1. Which of the following explains the meaning of effective collisions?

A the collisions where the particles have low kinetic energyB The collisions that causes a reactionC The collisions which are effective and take place before reactionD The collisions where the particles collide infrequently and results in low

activation energy

2. The following equation shows the reaction between powdered calcium carbonate and dilute hydrochloric acid.

CaCO3 (s) + 2HCl (aq) CaCl2 (aq) + H2O (l) + CO2 (g)

The liberation of carbon dioxide can be slowed down by

I reducing the temperature of hydrochloric acid used

II decreasing the concentration of the hydrochloric acid used

III using large marble pieces of marble chips

IV reducing pressure of the reaction

A II and IV only

B I and III only

C I, II and III only

D I, II , III and IV

3. Which of the following are true about the effect of the rise in temperature on the reactant particles with regards to the collision theory?

I The activation energy of the reactant particles increases

II The kinetic energy of the reactant particles increases

III The amount of the catalyst decreases after the reaction

IV The frequency of effective collisions between the reactant particles increases

A II and III only

B II and IV only

C I, II and III only

D I, II , III and IV

4. The table shows the volume of hydrogen gas collected when zinc is reacted with hydrochloric acid.

Time /s Volume of gas /cm3

0 015 2230 3845 4560 4875 48

What is the average rate of the reaction ?

A 0.37 cm3 s-1

B 0.64 cm3 s-1

C 0.80 cm3 s-1

D 1.47 cm3 s-1

5. Which of the following statements is true about a catalyst?

A It results in more products to be collected

B It changes the rate of reaction by altering the activation energy of the reaction

C A huge amount of catalyst is needed for a reaction to occur

D The mass of the catalyst decreases at the end of the reaction

Redox

1. Which of the following is not a redox reaction?

A FeCl2 + Mg MgCl2 + Fe

B 4FeO + O2 2FeO3

C Fe + Cl2 FeCl2

D FeSO4 + 2KOH Fe(OH)2 + K2SO4

2. Which one of the following is an oxidation process?

A A chlorine molecule gains hydrogen

B A potassium atom loses an electron

C A carbon dioxide molecule loses oxygen

D A fluorine atom gains an electron

3. With reference to the half equation given below,

What are the values of x, y and z?

x y z

A 2 3 4

B 3 3 4

C 4 3 2

D 4 3 4

4. In the reactivity series of metal, hydrogen placed between

A lead and copper

B zinc and iron

MnO4- + xH+ + ye- MnO2 + zH2O

C magnesium and zinc

D aluminium and zinc

5. Aminah has an iron necklace. She wants to make the necklace more beautiful and durable. What is the best way to do this?

A Wash the necklace with soap

B Plate the necklace with gold

C Soak the necklace in dilute hydrochloric acid for several minutes

D Scrub the necklace with sandpaper

Chemical for consumers

1. Which of the following is an active component of detergent?

A Sodium stearate

B Sodium alkyl sulphate

C Sodium oleate

D Sodium palmitate

2. The following is the part of the structural formula of a soap molecule.

CH3(CH2)16COO-

Which of the following is the name of that part?

A Glycerol

B Alkyl sulphate

C Stearate

D Terpence

3. The following information is about a traditional medicine.

Prevents flu

Helps to reduce blood pressure

Which traditional medicine is related to the information above?

A Ginger

B Lemon

C Garlic

D Quinine

4. A factory worker suffers a cut on his hand. His hand is swollen and painful.

What medicine is suitable to be given to the factory worker?

A Amphetamine

B Paracetamol

C Tranquiliser

D Streptomycin

5. Diagram shows the label of fruit juice selling in the supermarket.

Which of the following chemicals is the most suitable substitute for citric acid?

A Aspartame

B Ascorbic acid

C Ethanoic acid

D Sodium nitrite

Lazat Mango Juice

Mango juice, sugar, citric acid as antioxidant and permitted food flavouring

Ingredients

Electrochemistry

1. Which of the following are not electrolytes?

I Hydrochloric acid

II Glucose

III Molten zinc bromide

IV Acetamide

A I and II only

B I and III only

C II and IV only

D III and IV only

2. A molten substance, P , produces the following results when electrolysed.

Electrode Observation

Anode Brown vapour

Cathode Brown solid

Which of the following is substance P ?

A Lead (II) chloride

B Zinc bromide

C Sodium chloride

D Copper (II) bromide

3. Diagram shows the electrolysis of copper(II) nitrate solution.

Which of the half equation represents the reaction at the cathode?

A Cu2+(aq) + 2e- Cu(s)

B Cu(s) Cu2+(aq) + 2e-

C 4OH-(aq) O2(g) + 2H2O(l) + 4e-

D 2H+(aq) + 2e- H2(g)

4. Cryolite is added to aluminium oxide in the extraction of aluminium from its ore. What is the function of cyrolite?

A To increase the temperature of the mixture

B To increase the rate of electrolysis

C To reduce the rate of oxidation at the anode

D To reduce the melting point of aluminium oxide

Graphite rodGraphite rod

Copper(II) sulphate solution

5. Diagram shows the apparatus set up of a chemical cell.

What substance, when used as P and Q , will obtain the highest potential?

P Q

A Zinc Zinc nitrate

B Magnesium Magnesium nitrate

C Iron Iron(II) sulphate

D Aluminium Molten aluminium

Copper plate

Copper(II) nitrate solution

Plate P

Solution QPorous pot