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Name: …………………
Year 9/Section: ……
Date:……………..
Chemistry– Reinforcement Worksheet
Unit 4 and 5
1. Some reactions are endothermic. How does the temperature and energy
change in an endothermic reaction?
temperature change
energy change
A
B
C
D
energy taken in
energy given out
energy taken in
energy given out
decreases
decreases
increases
increases
2. When ammonium chloride dissolves in water the temperature falls. The
type of energy change is described as?
a. activated
b. exothermic
c. a decomposition
d. endothermic
3. When an exothermic reaction takes place, the reaction mixture gets
hotter because?
a. exothermic changes always produce gases
b. more energy is released when new bonds are made than is needed to
break existing bonds
c. in an exothermic change the products are less stable than the reactants
d. energy is always released in a chemical change which makes new
substances.
4. When ammonium nitrate is added to water, an endothermic reaction
occurs and?
a. the temperature falls
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b. the temperature rises
c. heat is given out
d. the surroundings get hotter
5. Methanol can be made when methane reacts with oxygen.
1 (a) The energy level diagram for this reaction is shown below.
1 (a) (i) What is the energy change represented by A?
1 (a) (ii) Use the energy level diagram to explain how it shows that this
reaction is exothermic.
6.
7. An example of an exothermic reaction is:
a. the lighting of a match
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b. an instant cold pack
c. when two chemicals are added together
d. evaporation of water
e. the breaking of bonds
8.
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9.
10.Complete the following sentences about the Periodic Table of elements
using words from the list below.
argon
one
colour
density
sodium
similarity
trend
seven
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Chlorine, bromine and iodine are elements in Group ......................... of the
Periodic Table.
These elements show a ......................... in ......................... down the group.
They all react rapidly with ......................... to form ionic compounds.
11. Three of the halogens in Group VII are listed below.
chlorine
bromine
iodine
(a) (i) How does their colour change down the Group?
...................................................................................................................
(ii) How do their melting points and boiling points change down the Group?
.....................................................................................................................
(iii) Predict the colour and physical state (solid, liquid or gas) of astatine, At.
colour
.........................................................................................................................
physical state
.......................................................................................................
12.
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