SPM Chemistry (Quiz 2)

A plastic bag is made from a polymer called polyethene. Which of the following is the property of plastic bag?

• Good insulator

• Non flammable

• Biodegradable

• High tensile strength

The following equation represents the reaction between calcium carbonate and hydrochloric acid.

CaCO₃ + 2HCL --> CaCl₂ + CO₂ + H₂O

Which products is most suitable to be chosen to determine the rate of reaction?

• Decreasing mass of calcium carbonate

• Increasing mass of calcium chloride

• Increasing volume of carbon dioxide

• Increasing volume of water

A student wants to produce a rubber strip that is harder and resistant to heat. He dip the natural rubber strip in a beaker containing methylbenzene and substance Q. What is substance Q?

• Ethanoic acid

• Hydrogen chloride

• Disulphur dichloride

• Potassium hydroxide

Ionic equation for the reaction between zinc and copper(II) ions solution, Cu²⁺ is shown below.

Zn + Cu²⁺ --> Zn²⁺ + Cu

Based on the equation, which substance undergoes oxidation?

• Zn

• Cu²⁺

• Zn²⁺

• Cu

Diagram 5 shows the energy level diagram for the precipitation reaction of silver chloride. Which of the following is true about the reaction?

• Endothermic reaction, heat is released.

• Exothermic reaction, heat is absorbed.

• Endothermic reaction, heat is absorbed.

• Exothermic reaction, heat is released.

Two cleaning agents, soap and detergent are used to wash clothes in sea water and river water. Which of the following pair is correct about the results obtained?I

• I and II

• I and IV

• II and III

• III and IV

What is the nucleon number of atom shown?

• 11

• 12

• 22

• 23

Which of the following is true about the atoms of elements Y and Z?

• Mass of one atom of Z is 18g

• The number of protons in atom Y is 90

• 5 moles of Z have the same mass as 1 mole of Y

• The density of one atom of Y is 5 times that of an atom of Z

Element Z is located in the same group as chlorine in the Periodic Table. Z is not the actual symbol of the element.

Which of the following statements are the chemical properties of element Z?

• Reacts with water to produce alkaline solution

• Reacts with sodium to produce a black solid

• Reacts with sodium hydroxide to produce an acidic solution

• Reacts with hot iron to form brown solid.

Diagram shows the electron arrangement of a carbon dioxide molecule. Which of the following is true?

• One carbon atom contributes four electrons to be shared by two oxygen atoms.

• Four double covalent bonds are formed in a carbon dioxide molecule.

• Each oxygen atom contributes one electron for sharing.

• One carbon atom requires two electrons to achieve the octet electron arrangement.