Revision work for G-8 Chemistry Chapter 15 and 16
Revision work for G-8 Chemistry Chapter 15 and 16
Question 1
Exothermic reactions give out energy. T
Endothermic reactions take in energy. T
In exothermic reactions, the temperature goes down, F
ΔH is negative for an endothermic reaction. F
Breaking bonds requires energy. T
Whenever chemicals react, we get a transfer of
energy. T
Food is the fuel for our bodies. T
Question 2
1 You need 3 things to make a fire
A. Fuel B. heat C. oxygen
All of them
2 Fuels store ------------ energy.
a)P.E b)K.E d)none of them
c)Chemical
3 The gas we burn in a Bunsen burner is usually methan
a)CH b)CH2 c)CH3
d)CH4
4 Therefore we use a copper beaker (called a---------)
a)Thermometer c)pH meter d)barometer
b)Calorimeter
5 Some reactions take in heat from their surroundings. These are called ----------------------reactions.
b)Exothermic c)both d)none of them
a)endothermic
6. ---------------------flame shows complete combustion
B yellow c both d none of them
A blue
7. This is an example of --------------------reaction
A endothermic c both d none of them
B Exothermic
8. This is an example of --------------------reaction
B Exothermic c both d none of them
A endothermic
A endothermic c both d none of them
B Exothermic
10. ΔH is
B negative c neutral d both A & B
A positive
11.Breaking bond required energy. It is -------------
B Exothermic c both d none of them
A endothermic
12. The steeper the slope, the -------------------- reaction.
A slow c both d none of them
B fast
13. As we increase the surface area, the rate of reaction ------------------------.
A same b decrease d both b & c
C increase
14. Reactants will convert into products if collision------------------
A Unsuccessful b normal c moderate
D Successful or effective
A lower B higher c slower
D faster
16. In reactions between gases, increasing the pressure, increases the ----------- of reaction.
B amount c time d temperature
A rate
17. A catalyst is a substance which speeds up a chemical reaction. At the end of the reaction, the catalyst is chemically------------------------.
B Changed c both d none of them
A unchanged
18. A catalyst ------------------ the activation energy
A increase c both A & B d none of the above
B lower
19. Enzymes are biological -------------------.
A reactant b product c both B & D
D catalysts
20. Enzymes -------------------------work at high temperature.
B cant
Question 3
The large the surface area, the faster the reaction.
The more concentrated a solution is, the faster it reacts.
The higher the temperature, the faster the reaction.
A catalyst is a substance which speeds up a reaction.
An enzyme is a catalyst found in living things.
Exothermic reactions give out energy.
The 3 things we need for a fire are fuel, heat and Oxygen.
Please make the quiz easy
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