Chemistry

A vibrant and colorful illustration of a chemistry lab, featuring beakers, test tubes, and the periodic table in the background, with molecular structures and chemical reactions depicted, conveying a sense of scientific exploration and discovery.

Chemistry Knowledge Challenge

Test your understanding of chemistry concepts with our engaging quiz designed for enthusiasts and students alike. Answer a series of multiple-choice questions that will challenge your knowledge of the periodic table, chemical reactions, and more.

Whether you are a budding chemist or just looking to brush up on your skills, this quiz offers:

  • 10 thought-provoking questions
  • Instant feedback on your answers
  • An opportunity to learn while you play!
10 Questions2 MinutesCreated by DiscoverElement42
Name:
Gases are separated from liquid air by fractional distillation. The boiling points of four gases are shown. Which gas is both monoatomic and a liquid at –200 C?
Argon –186
Helium –269
Neon –246
nitrogen –196
In which molecule are all the outer shell electrons from each atom used to form covalent bonds?
CH4
Cl 2
H2O
NH3
What is the balanced chemical equation for the reaction between calcium and water?
Ca + H2O  CaOH + H2
Ca + H2O  Ca(OH)2 + H2
Ca + 2H2O  CaOH + H2
Ca + 2H2O  Ca(OH)2 + H2
A compound has the formula XF2 and has a relative mass of 70. What is element X?
Gallium
Germanium
Sulfur
ytterbium
Three substances are electrolysed using inert electrodes. Which substances produce hydrogen at the negative electrode? 1 concentrated hydrochloric acid 2 concentrated aqueous sodium chloride 3 dilute sulfuric acid
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
Fuels release heat energy when they burn. Which substances are used as fuels? 1 argon 2 butane 3 hydrogen 4 methane
1 and 3 only
1, 3 and 4
2, 3 and 4
2 and 4 only
Which property is shown by the alkali sodium hydroxide?
It has a pH less than pH 7.
It produces a gas when it is warmed with ammonium chloride
It turns blue litmus red.
It turns universal indicator green.
When aqueous sodium hydroxide is added to a solution of a metal ion, a grey-green precipitate forms, which dissolves in excess to form a dark green solution. What is the identity of the metal ion?
Chromium(III)
Iron(II)
Iron(III)
Copper(II)
Which statements describe the Periodic Table? 1 The elements are arranged in order of their nucleon number. 2 The elements are arranged in order of their proton number. 3 It is used to predict the properties of elements.
1 and 3
1
2,3
2 only
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