Questions and Answers
Water is a compound made up of two elements: hydrogen and ______.
oxygen
Hydrogen and oxygen are combined chemically in a ______:8 ratio by mass.
1
Both hydrogen and oxygen are gases, but water at ordinary temperature is a ______.
liquid
Hydrogen gas is combustible and burns, while oxygen is a supporter of ______.
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Iron (II) sulphide is a compound formed when iron and ______ combine chemically.
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