Calculate the amount in moles of NaNO$_3$ used, the amount in moles of O$_2$ formed, and the volume of O$_2$ formed, in dm$^3$ (at r.t.p.).
Explain the meaning of the term base.
Write a chemical equation for magnesium's reaction with warm water.
Describe experiments that demonstrate that aluminium oxide is amphoteric.
Name the type of bonding present in silicon(IV) oxide.
Give two physical properties of silicon(IV) oxide.
What is meant by ionic bonding?
Deduce the chemical formula of calcium phosphate.
Complete the energy level diagram for this reaction. Add an arrow that clearly indicates the energy change during the reaction.
Use this information to calculate the bond energy, in kJ/mol, of one S-F bond in SF$_4$.
Explain why chlorine addition makes water safe to drink.
A chlorine compound is used in the laboratory to test for water. Name the chlorine compound used in this test and describe the colour change seen when the test is positive.
Explain the reason argon is unreactive.
Give one use for argon.