Year 10 Chemistry Revision

What is an ion?

• A stable atom with a full outer shell of electrons

• 
  A stable atom with a full inner shell of electrons

• An electrically charged atom or group of atoms formed by the loss or gain of electrons

• An electrically charged atom or group of atoms formed by the loss or gain of protons

What type of ions do non-metals form?

• Positive ions

• 
  Neutral ions

• Negative ions

• Fractional ions

What type of bonding involves the formation of ions?

• Ionic bonding

• Metallic bonding

• Hydrogen bonding

• Covalent bonding

How is the periodic table of elements arranged?

A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?

• Physical change

• Chemical change

• No change

The atomic mass of an element tells you

• the number of protons in an atom of that element
• the number of neutrons in an atom of that element
• The number of protons and neutrons

• the number of electrons in an atom of that element

According to the chemical symbol... Which statement is correct?

• This is potassium. It's from group 1. It has 19 protons, 19 electrons and 20 neutrons.

• This is potassium. It's from group 7. It has 19 protons, 20 electrons and 19 neutrons.

• This is potassium. It's from group 1. It has 19 protons, 20 electrons and 20 neutrons.

• This is potassium. It's from group 7. It has 19 protons, 19 electrons and 20 neutrons.

What does the (g) stand for in the following equation?

Fe (s) + O₂(g) --> FeO (s)

Lithium and magnesium both react with nitrogen.

The equation for the reaction between lithium nitride and water is

Li₃N(s) + 3H₂O(l) → 3LiOH(aq) + NH₃(g)

A sample of 1.40 g of lithium nitride is added to an excess of water.

Calculate the amount, in moles, of Li3N in the sample of lithium nitride. (to 2dp)

Magnesium chloride can be made by reacting excess magnesium carbonate with dilute hydrochloric

acid.

The equation for the reaction is

MgCO₃ + 2HCl → MgCl₂ + H₂O + CO₂

In an experiment 0.050 mol of MgCO3 reacts with excess HCl.

A yield of 5.5 g of MgCl₂.6H₂O is obtained.

Calculate the percentage yield of MgCl₂.6H₂O