Practice Concentration Of Reactants (2.1) - Rate of Reactions - IB 10 Sciences (Group 4) – Chemistry

Practice: Concentration of Reactants

Lesson 2.1Rate of Reactions

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8 questions

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6 sample questions

Question 1.
What happens to the rate of a reaction when the concentration of reactants increases?
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Think of how more particles interacting affects reactions.
Question 2.
Define concentration in terms of a chemical reaction.
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Focus on how it relates to the number of molecules.
3Question 3.
What is the main effect of increasing reactant concentration?
- Decrease reaction rate
- Increase reaction rate
- No effect
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Think about collisions.
4Question 4.
True or false: Higher pressure on gas reactants generally decreases the rate of reaction.
- True
- False
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Consider how pressure and volume relate.
Question 5.
A pilot study shows that doubling the concentration of hydrochloric acid in a reaction with zinc increased the rate of hydrogen gas production by 75%. Assuming the relationship remains linear, what would be the expected increase in reaction rate if the concentration is tripled?
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Look at the initial increase to predict the new rate.
Question 6.
If a given reaction has an activation energy of 50 kJ/mol and is performed under standard conditions at two different concentrations, discuss how the reaction rate might vary based on your knowledge of concentration and reaction mechanics.
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Consider both concentration and collision theory together to analyze the rate.

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