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GCSE
Gcse Chemistry
Endothermic And Exothermic Reactions 1
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Q.1
In an exothermic reaction...
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energy is absorbed from the surroundings and the temperature increases
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energy is released to the surroundings and the temperature of the surroundings increases
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energy is absorbed from the surroundings and the temperature of the surroundings decreases
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energy is released to the surroundings and the temperature of the surroundings decreases
Q.2
In an endothermic reaction...
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energy is absorbed from the surroundings and the temperature increases
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energy is released to the surroundings and the temperature of the surroundings increases
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energy is absorbed from the surroundings and the temperature of the surroundings decreases
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energy is released to the surroundings and the temperature of the surroundings decreases
Q.3
When an exothermic reaction takes place, the reaction mixture gives out heat because...
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more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
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the radiation energy produced by the reaction has to be got rid of via diffusion
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energy is always absorbed in a chemical change which makes new substances
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in an exothermic change, the products are less stable than the reactants
Q.4
When ammonium nitrate is added to water, an endothermic reaction occurs and...
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nothing changes
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the temperature of the reaction mixture falls
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the temperature rises
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heat is given out
Q.5
Which of the following reactions is exothermic?
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Photosynthesis
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Combustion
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Ethanoic acid + sodium carbonate
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Ammonium nitrate + water
Q.6
Where will the products be in relation to the reactants in an endothermic energy diagram?
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Lower
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Higher
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The same level
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An energy level diagram doesn't show levels
Q.7
Energy change in a chemical reaction is represented by the symbol...
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ΔE
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H
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ΔH
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ΔT
Q.8
ΔH is negative for what type of reactions?
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Endothermic
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Oxidation
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Displacement
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Exothermic
Q.9
ΔH is positive for what type of reactions?
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Endothermic
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Oxidation
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Displacement
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Exothermic
Q.10
Energy changes in chemical reactions are measured in...
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Joules
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kJ
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kJ/mol
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kWh
0 h : 0 m : 1 s
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