Page 24 - Big Ideas Year 10 sciPAD 2025

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24 SCIPAD - BIG IDEAS - BOOK 2
NATURE OF THE ATOM
End of Chapter Review Questions
1. Tick the boxes to show whether these are chemical changes or physical changes.
Chemical change Physical change
Changing water to steam
Dissolving sugar in a cup of tea
Boiling an egg
Adding a metal to an acid
An iron nail rusting
Burning a match
2. The following word equation shows the reaction of sodium with chlorine to make sodium
chloride.
Sodium + chlorine sodium chloride
(a) In a chemical equation, like the one above, what name is given to the chemicals
that you start with? 
(b) What name is given to the chemical(s) that are produced in a chemical reaction?

(c) What does the arrow represent in a chemical equation? 

3. Write word equations for the following reactions:
(a) Zinc reacting with sulfuric acid to produce zinc sulfate and hydrogen gas.

(b) Magnesium metal burning in oxygen to produce magnesium oxide.

(c) Calcium fluoride being produced when calcium reacts with fluorine gas.

4. (a) Name the three particles that make up an atom.
(i) 
(ii) 
(iii) 
(b) Which of these three particles is the smallest? 
(c) What is the name given to the centre of the atom? 
(d) Which two particles are found in the centre of the atom? 

(e) Which particle has: (i) no charge? 
(ii) a positive charge? 
(iii) a negative charge? 
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