10 Questions
What is the significance of a bracket in a chemical formula when there is only one polyatomic ion?
The bracket is not required.
How are binary compounds defined?
Compounds made up of two different elements.
Explain the process of criss-crossing valencies when writing chemical formulas.
Write the constituent elements with their valencies, then crossover the valencies of the combining atoms.
In magnesium chloride, why is the formula written as MgCl2?
There are two chloride ions (Cl-) for each magnesium ion (Mg2+).
Why are the charges on the ions not indicated in chemical formulas?
To ensure the overall structure is neutral and the positive and negative charges balance each other.
What is the chemical formula for aluminium oxide?
Al2O3
Explain why the formula for hydrogen sulphide simplifies to CaO instead of Ca2O2.
The valencies of the two elements are the same, so the formula is simplified.
Provide the chemical formula for potassium nitrate.
KNO3
Write the chemical formula for calcium carbonate.
CaCO3
Explain the term 'chemical formula'.
A representation of the chemical composition of a substance using symbols and numbers.
Test your knowledge on the valencies of common ions as provided in Table 3.6. Explore the valency of ions ranging from sodium and potassium to polyatomic ions like ammonium and hydroxide.
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