Chemistry Test

Which of the following statements is NOT TRUE about the particle in gas?

• The particles of gas move at high speed.

• The collision between the gas particles and the wall of the container is elastic.

• The gas particles more randomly in all direction.

• The gas particles are arranged in regular patterns.

Why sodium chloride used in the preparation of soap?

• To speed up the reaction to produce soap.

• To produce soap which foams easily.

• To reduce solubility of soap.

• To make soap softer.

Which substance is a compound?

• Sodium

• Magnesium

• Carbon

• Naphthalene

Which statement explains why the size of the atoms of period 3 elements decrease across the period in the Periodic Table.

• The number of protons increases.

• The relative atomic mass increases.

• The number of valence electrons increases.

• The number of shells filled with electrons increases.

Diagram above shows the structural formula for a carbon compound. Which of the following is the IUPAC nomenclature for the compound?

• 3-methylbut-2-ene

• 2-methylbut-1-ene

• 2-methylbut-2-ene

• 3-methylbut-3-ene

Which substances are non-electrolytes?

I Ethanol

II Acetamide

III Lead (II) bromide

IV Sodium chloride

• I and II only

• I and III only

• II and IV only

• III and IV only

Which equation represents a redox reaction?

• NaOH + HCl -> NaCl + H₂O

• Cu(NO₃)₂ + Zn -> Zn(NO₃)₂ + Cu

• 2KCl + Pb(NO₃)₂ -> PbCl₂ + 2KNO₃

• MgCO₃ + 2HCl -> MgCl₂ + H₂O + CO₂

Compound M conduct electricity in aqueous solution or molten state. It also has a high melting point and boiling point. What is compound M?

• CO₂

• NH₃

• CCl₄

• MgCl₂

Which reaction has the highest rate of reaction?

• Rusting of iron fence.

• Decaying of death organism.

• Burning of small piece of charcoal in the air.

• Formation of stalactites and stalagmites in a cave.

Diagram above shows a magnesium atom compared to standard atom of carbon-12. What is the relative atomic mass of magnesium?

• 2

• 12

• 24

• 48