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Unit Quiz

Energy changes (HT)

This quiz will help you to assess your learning of key concepts and knowledge in this unit.

Q1.What is the minimum amount of energy needed to start a reaction?

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Q2.What type of reaction does this energy level diagram represent?

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Q3.A reaction is overall endothermic because...

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Q4.To break a C-C bond it requires 348 kJ/mol of energy, how much energy is released when a C-C bond is made?

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Q5.What happens to bonds during a chemical reaction?

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Q6.Which arrow in the energy level diagram represents activation energy?

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Q7.Which arrow in the energy level represents the overall energy change?

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Q8.What type of reaction is shown in the energy level diagram?

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Q9.If the overall energy change is negative, what type of reaction is it?

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Q10.During a reaction, 2462 kJ/mol of energy is needed to break bonds and 1363 kJ/mol of energy is released when bonds are made. What type of reaction is it?

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Q11.During a reaction 988 kJ/mol of energy is needed to break bonds and 1892 kJ/mol of energy is released when bond are made. What type of reaction is it?

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Q12.A student is investigating the effect of changing the concentration of acid on the temperature change when reacting an acid with an alkali. Identify the independent variable.

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Q13.What happens to the temperature of the surroundings when an exothermic reaction occurs?

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Q14.Why is it important to use a polystyrene cup in an experiment where the temperature change is measured?

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Q15.Why is it important to do at least 3 repeats?

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Q16.Select 4 examples of exothermic reactions:

Select four (4) boxes

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Q17.What measurement could we take to determine if a reaction was endothermic or exothermic?

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Q18.Hypothesis: A student investigated the temperature change when zinc reacts with different concentrations of copper sulfate. What is the independent variable?

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Q19.Hypothesis: A student investigated the temperature change when zinc reacts with different concentrations of copper sulfate? What is the dependent variable?

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Q20.Hypothesis: A student investigated the temperature change when zinc reacts with different concentrations of copper sulfate. What are the control variables? Choose 2 answers.

Select two (2) boxes

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