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High School: 9th and 10th Grade
Chemistry
Endothermic And Exothermic Reactions 2
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Q.1
Thermal decomposition is...
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an exothermic reaction
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an endothermic reaction
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a common reaction
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an energy rich reaction
Q.2
Bond breaking is an...
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endothermic process
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exothermic process
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exciting process
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eltothermic process
Q.3
Bond making is an...
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endothermic process
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exothermic process
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exciting process
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eltothermic process
Q.4
On an energy level diagram, the products of an exothermic reaction will be...
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higher than the reactants
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the same level as the reactants
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on a different diagram to the reactants
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lower than the reactants
Q.5
Which of the following observations indicate an endothermic reaction?
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The temperature of the decaying grass in the compost maker was considerably above the outside temperature
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Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
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The mixture bubbled vigorously and the temperature dropped by 40°C
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A red glow spread through the mixture and the temperature increased by 10°C
Q.6
ΔH is the energy change for the reaction. To calculate this...
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add the reactants' energy to the products' energy
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subtract the reactants' energy from the products' energy
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divide the reactants' energy by the products' energy
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subtract the products' energy from the reactants' energy
Q.7
Electrolysis requires energy to make it work. This means it is...
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an endothermic reaction
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an exothermic reaction
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an eltothermic reaction
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a chemical reaction
Q.8
Neutralization is...
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an endothermic reaction
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a physical reaction
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an exothermic reaction
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an oxidation reaction
Q.9
Pick the correct combination of information for an exothermic reaction.
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°C ↑ ΔH +ve
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°C ↑ ΔH -ve
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°C ↓ ΔH +ve
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°C ↓ ΔH -ve
Q.10
If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?
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There are equal amounts of energy required to break and make the bonds in the reaction
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There is a lot of energy used for both making and breaking bonds
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There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
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There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products
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