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Unit Quiz

The rate and extent of chemical change

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

Q1.For a reversible reaction that is exothermic in the forward direction, what effect does increasing temperature have on the position of equilibrium?

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Q2.In the Haber process, an iron catalyst is used to speed up the rate of reaction. What effect does adding a catalyst have on the position of equilibrium?

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Q3.In a reaction that involves gases, increasing the pressure will shift the equilibrium to...

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Q4.Hypothesis: Increasing the concentration of hydrochloric acid increases the rate of reaction when reacting with magnesium. What is the independent variable (variable that is being changed)?

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Q5.Hypothesis: Increasing the concentration of hydrochloric acid increases the rate of reaction when reacting with magnesium. What is the dependent variable (variable that is being measured)?

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Q6.Hypothesis: Increasing the concentration of hydrochloric acid increases the rate of reaction when reacting with magnesium. Which of the following are the control variables? (Tick THREE)

Select three (3) boxes

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Q7.How can we check reproducibility to ensure the data obtained from a practical is of high quality?

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Q8.Which of the following marble chips has the largest surface area to volume ratio?

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Q9.Calcium carbonate (marble chips) react with hydrochloric acid to produce calcium chloride, water and what gas?

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Q10.Calculate the mean rate of reaction when 23 cm³ of gas is produced in 15 seconds.

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Q11.What happens to the volume of gas when pressure is increased?

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Q12.What happens to the reacting particles when pressure is increased?

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Q13.Why does the rate of reaction increase when pressure of reacting gases increases?

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Q14.Which of the following is the state symbol for a solution?

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Q15.Which of the following equipment can we use to collect and measure volume of gas? Tick TWO boxes.

Select two (2) boxes

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Q16.What is the gas produced when magnesium reacts with hydrochloric acid?

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Q17.Increasing the concentration of reactants in a solution will result in...

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Q18.What does the gradient of a graph tell us if the x axis is time and y axis is volume of gas collected?

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Q19.A reversible reaction can reach equilibrium. In a closed system, equilibrium is reached when the forward and reverse reaction happen at the same ___________

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Q20.A reversible reaction is exothermic in the forward reaction, the reverse reaction is... ?

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Q21.Which of the following factors affect rate of reaction?

Select four (4) boxes

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Q22.How do catalysts increase rate of reaction?

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Q23.What does the symbol ⇌ mean?

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