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1.
What always happens in a
chemical reaction?
answer
A new substance is always
formed in a chemical reaction
2.
What changes might indicate that a
chemical reaction has taken place?
answer
Energy change
Permanent colour change
Gas produced (effervescence)
Solid formed in a liquid (precipitation)
3. An element is ………
answer
An element is the simplest type of
substance.
It is made up of only 1 type of atom.
4.
What is a GROUP in the Periodic
Table?
answer
A column of elements
5.
What is a PERIOD in the periodic
table?
answer
A row of elements
6.
Why are certain elements in the
same group?
answer
Because they have similar
chemical properties
7.
Give some metallic properties?
answer
Conduct electricity and heat
Malleable (bend into shape)
Ductile (draw into wires)
Most of them are strong
8.
What are compounds?
answer
Substances made of two or more
different types of atom joined
together.
9.
What is the difference between a
compound and a mixture?
answer
The atoms of a compound are joined together.
The substances in a mixture are NOT joined
and can be easily separated.
10. What is a molecule?
answer
Two or more non metal atoms
joined together
Can be element e.g. O2, H2
OR compound e.g. H2O, CO
11. What does -ide at the end of the
name of a compound indicate?
answer
IDE means that the compound is made up of
the TWO elements
(the actual elements are obvious from the
compound’s name).
12. What is ELECTROLYSIS?
answer
Using ELECTRICITY to break up a
compund.
13. Write a word equation for:
Methane burns in oxygen to produce carbon
dioxide. Water is also produced.
answer
Methane + Oxygen  Carbon + Water
Dioxide
14. Sort these into chemical answer
reaction and physical change.
Hair growing,
Chemical
Reaction
Ice melting,
Match burning,
Hair growing
Baking cake,
Firework exploding,Match burning
Boiling water
Baking cake
Firework exploding
Physical Change
Ice melting
Boiling Water
15. Describe how the concentration of
reactants affects the speed of a reaction?
As reactant concentration
increases the speed of
reaction increases.
16. What is meant by a property of
a chemical?
answer
A property of a chemical is
what it is like or what it can do
chemically
17. Name FOUR factors which affect the
speed (or rate) of a chemical reaction?
Particle Size (Surface Area)
Temperature
Concentration
Use of Catalyst
18. When can a catalyst NOT
speed up a reaction?
SOME reactions DO NOT have a
catalyst.
19. Where in the Periodic Table would you
find the METALS and the NON-METALS?
answer
Metals are found to the Left Hand Side
of the zigzag line; Non-metals to the
Right Hand Side of the zig-zag line
20. What are ATOMS?
answer
Atoms are very small, particles which
make up every element. They are too
small to see.
21. What is a PRECIPITATE?
answer
A precipitate is a solid which is
formed when two solutions
react together
22. What is EFFERVESCENCE?
answer
Effervescence is bubbling and fizzing
when a gas is given off .
23. Use the Periodic Table in your planner.
Give the SYMBOLS for the elements :
lead, gold, sodium, potassium and iron?
Lead – Pb
Gold – Au
Sodium – Na
Potassium – K
Iron - Fe
answer
24. Describe how particle size
affects the speed of reaction?
As particle size decreases the
speed of reaction increases
25. Describe how temperature
affects the speed of reaction?
As temperature increases the
speed of reaction increases
26. What are ENZYMES?
Catalysts from living
things (Biological
catalysts)
27. What is a catalyst?
A substance which can speed up a
reaction, but is not used up in the
reaction and can be recovered
chemically unchanged
28. Why does decreasing the particle
size of reactants increase the
speed of reaction?
Smaller particles give a bigger
surface area. This results in more
collisions between reactants and
therefore faster reactions
29. What must be controlled when
carrying out experiments to
compare speeds of reaction?
All variables other than the
one being tested must be
kept the same in all
experiments
30. What is a VARIABLE?
Any factor in an experiment
which can be changed or varied.
e.g. concentration or temperature
of the solution used
31. Rates Experiments
• Which two of the following experiments
could be used to find the effect of changing
the particle size?
A
2M hydrochloric acid
at 250C
B
2g of small chalk lumps
answer
C
2M hydrochloric acid
at 250C
2g of large chalk lump
2M hydrochloric acid
at 150C
2g of small chalk lumps
D
1M hydrochloric acid
at 250C
2g of small chalk lumps
32. Rates Experiments
• Which two of the following experiments
could be used to find the effect of changing
the concentration of the acid?
A
2M hydrochloric acid
at 250C
B
2g of small chalk lumps
answer
C
2M hydrochloric acid
at 250C
2g of large chalk lump
2M hydrochloric acid
at 150C
2g of small chalk lumps
D
1M hydrochloric acid
at 250C
2g of small chalk lumps
33. Rates Experiments
• Which two of the following experiments
could be used to find the effect of changing
the temperature of the acid?
A
2M hydrochloric acid
at 250C
B
2g of small chalk lumps
C
answer
2M hydrochloric acid
at 250C
2g of large chalk lump
2M hydrochloric acid
at 150C
2g of small chalk lumps
D
1M hydrochloric acid
at 250C
2g of small chalk lumps