1. What is a chemical element?
Elements are the most basic chemical units.
They are the building blocks of chemical substances
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2. In the periodic table below, what does each box containing a symbol represent?
An element
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3. A = atomic number B = atomic mass
Each element is represented by a symbol, Ne is neon. Identify the atomic number and the atomic mass on the diagram below
A = atomic number
B = atomic mass
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4. What type of elements are found on the right-hand side of the “staircase”?
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Non-metals

5. What type of elements are found on the left-hand side of the “staircase”?
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metals

6. State a property of a metal element
Metal elements conduct Or
All metal elements are solid at room temperature (except mercury)
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7. State a property of a non-metal element
Non-metal elements do not conduct (except graphite) Or
Almost all non-metal elements are gases at room temperature
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8. What are the columns in the periodic table called?
Groups
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9. Why are elements placed in groups?
They have similar chemical properties

10. Elements react with other elements to form new substance called compounds. Name the following compounds
Elements joined together
A = hydrogen and fluorine
B= magnesium and oxygen
C= hydrogen and chlorine
D= sodium and oxygen
A = hydrogen fluoride
B= magnesium oxide
C= hydrogen chloride
D= sodium oxide
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11. State the chemical formula for the following compounds
1 = hydrogen fluoride
2= magnesium oxide
3= hydrogen chloride
4= sodium oxide
1 = HF
2= MgO
3= HCl
4= NaCl
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12. Name the two chemical compounds shown below
CO2 Carbon dioxide
C0 Carbon monoxide
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13. A mixture of elements and compounds not joined together
What is a mixture
A mixture of elements and compounds not joined together
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14. magnesium + oxygen magnesium oxide
Write the word equation when magnesium reacts with oxygen to form magnesium oxide
magnesium + oxygen magnesium oxide
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15. Which of the following is a chemical reaction?
A gas explosion
Breaking glass
Petrol burning in a car engine
Water boiling in a beaker
Milk being produced in a cow
Burning paper
A gas explosion
Petrol burning in a car engine
Milk being produced in a cow
Burning paper
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16. State a sign of a chemical reaction
Change in appearance or
Precipitate is formed (solid)
a gas given off
energy released or taken in
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17. The speed of a chemical reaction is called the rate of the reaction
The speed of a chemical reaction is called the rate of the reaction. For each of the pictures shown below, state if the rate is slow or fast or very fast. X W Y
W Rusting - slow
X Baking - fast
Y Explosion – very fast
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18. Temperature or Concentration Adding a catalyst
He rate of a reaction can be changed if the particle size is altered. Name one other factor that could change the rate of a reaction.
Temperature or
Concentration
Adding a catalyst
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19. Which two of the following would make the reaction go faster?
Decreasing the particle size Or
Increasing the concentration
decreasing the temperature
Adding a catalyst
Increasing the concentration
Adding a catalyst
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20. All solutions can be classified as being acid, alkali or neutral
All solutions can be classified as being acid, alkali or neutral. Identify X and Y on the pH scale below
X = acid
Y = alkali
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21. What causes acid rain to form?
When sulphur dioxide gas reacts with moisture in the air.
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22. Name the type of reaction taking place below.
Neutralisation
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23. Complete the word equation for a neutralisation reaction
acid + …………… salt + ………………
acid + alkali salt + water
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24. Why is lime added to a lake poisoned by acid rain?
The lime neutralises the acid
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25. Which substance would you use to treat a bee sting?
Baking soda
(a bee sting is acidic and the baking soda is alkaline)
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26. Is a nettle sting acidic or alkaline?
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