Diagram 1 shows the standard representative of element A. Number 23 refers to

• Proton number

• Nucleon number

• Number of electrons

• Number of neutrons

Substance A has melting point of -94.0 C and boiling point of 65.0 C. What is the state of matter of Substance A at room temperature?

• Solid

• Liquid

• Gas

Why atom of carbon-12 is used as the standard atom?

• Exist as solid at room temperature

• Can easily combines with other elements

• Exist as non-metal element

• Can conduct electricity

Calculate the number of positive ions in 1.5 mol of aluminium oxide.

• 6.02 x 10^23

• 6.02 x 10^23 x 1.5

• 6.02 x 10^23 x 1.5 x 3

• 6.02 x 10^23 x 1.5 x 2

In the Modern Periodic Table, the elements are arranged in order of the

• Nucleon number

• Number of neutron

• Proton number

• Valence electron

Which of the following is an ionic compound?

• NaCl

• NH3

• HCl

• CO2

Which pair is matched correctly?

• Hydrochloric acid - pH 4

• Sodium hydroxide - pH 8

• Ethanoic acid - pH 6

• Ammonia - pH 14

When the temperature of a reacting mixture increases, the rate of reaction increases. Which statement explains why the rate of reaction increases? Which statement explains why the rate of reaction increases?

• The total surface area of the reactant particles increases.

• The total number of the reactant particles per unit volume increases.

• The reactant particles move faster and collide more often with one another.

• The reactant particles which collide more often are able to overcome the lower activation energy.

Which composite material contains a mixture of glass and silver chloride?

• Fibre glass

• Fibre optic

• Photochromic glass

• Borosilicate glass

Substances X is probably a type of...

• Alloy

• Glass

• Ceramic

• Metal