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Chemistry

10th - 12th grade

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Slide 1
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Chemistry
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Question 2
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Q.
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?
answer choices
100% S
50% S and 50% T
10% S and 90% T
100% T
100% S
alternatives
50% S and 50% T
10% S and 90% T
100% T
answer explanation
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Question 3
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Q.
In an experiment, a student needs to measure 36.50 cm³of liquid.
Which apparatus would measure this volume most accurately?
answer choices
beaker
burette
measuring cylinder
pipette
beaker
alternatives
burette
measuring cylinder 
pipette
answer explanation
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Question 4
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Which method can be used to obtain water from copper(II) sulfate solution?
answer choices
simple distillation
fractional distillation
crystallisation
evaporation
simple distillation
alternatives
fractional distillation 
crystallisation
evaporation 
answer explanation
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Question 5
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Which method can be used to obtain copper(II) sulfate crystals from its solution?
answer choices
simple distillation
fractional distillation
crystallisation
evaporation
simple distillation
alternatives
fractional distillation
crystallisation
evaporation
answer explanation
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Question 6
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Q.
Which one represents an ion?
answer choices
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
A particle with one proton, no neutron and one electron
alternatives
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
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Question 7
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Q.
What is missing from the equation below?
acid + alkali --> salt + ...........
answer choices
carbon dioxide
hydrogen
water
oxygen
carbon dioxide 
alternatives
hydrogen
water
oxygen
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Question 8
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Q.
Element X forms a basic oxide.
What is X?
answer choices
a halogen
a metal
an acid
a non-metal
a halogen
alternatives
a metal
an acid
a non-metal
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Question 9
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Which is a property of all metals?
answer choices
conduct electricity
hard
low melting point
react with water
conduct electricity 
alternatives
hard
low melting point
react with water 
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Question 10
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Q.
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?
answer choices
CO
H₂O
N₂
SO₂
CO
alternatives
H2O
N2
SO2
answer explanation
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