Chemistry

Chemistry

Multiple Choice

A mixture contains equal volumes of two liquids. Liquid S has a boiling point of 80^oC and liquid T has a boiling point of 54^oC.

What is the composition of the first distillate?

• 100% S

• 50% S and 50% T

• 10% S and 90% T

• 100% T

Multiple Choice

In an experiment, a student needs to measure 36.50 cm³ of liquid.

Which apparatus would measure this volume most accurately?

• beaker

• burette

• measuring cylinder

• pipette

Multiple Choice

Which method can be used to obtain water from copper(II) sulfate solution?

• simple distillation

• fractional distillation

• crystallisation

• evaporation

Multiple Choice

Which method can be used to obtain copper(II) sulfate crystals from its solution?

• simple distillation

• fractional distillation

• crystallisation

• evaporation

Multiple Choice

Which one represents an ion?

• A particle with one proton, no neutron and one electron

• A particle with three protons, 4 neutrons and three electrons

• A particle with six protons, six neutrons and six electrons

• A particle with 11 protons, 12 neutrons and 10 electrons

Multiple Choice

What is missing from the equation below?

acid + alkali --> salt + ...........

• carbon dioxide

• hydrogen

• water

• oxygen

Multiple Choice

Element X forms a basic oxide.

What is X?

• a halogen

• a metal

• an acid

• a non-metal

Multiple Choice

Which is a property of all metals?

• conduct electricity

• hard

• low melting point

• react with water

Multiple Choice

A coal-burning heater is inefficient and badly sealed. The limestone walls are near the heater and being worn away.

Which gas, escaping from the heater, causes the walls to be worn away?

• CO

• H₂O

• N₂

• SO₂