Factors Affecting Rates of Reactions (Leaving Cert Chemistry): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
How many main factors affect the rate of chemical reactions?
How many main factors affect the rate of chemical reactions?
Six
Why do ionic compounds generally react much faster than covalent compounds?
Why do ionic compounds generally react much faster than covalent compounds?
They are already dissociated into ions
The reaction of hexane with bromine takes over 16 minutes. Why is it so slow?
The reaction of hexane with bromine takes over 16 minutes. Why is it so slow?
Covalent bonds must be broken first
Why does increased surface area lead to faster reaction rates?
Why does increased surface area lead to faster reaction rates?
More frequent collisions occur
How many specific conditions must be met for a dust explosion to occur?
How many specific conditions must be met for a dust explosion to occur?
Five
In the marble chip experiment, what happens when using small chips instead of large lumps?
In the marble chip experiment, what happens when using small chips instead of large lumps?
Same but faster reaction
What is the relationship between concentration and reaction rate?
What is the relationship between concentration and reaction rate?
Directly proportional
What happens to the reaction rate if the concentration of a reactant is doubled?
What happens to the reaction rate if the concentration of a reactant is doubled?
Rate doubles
How does higher temperature affect reactant particles?
How does higher temperature affect reactant particles?
Increases their kinetic energy
What is the key property that defines a catalyst?
What is the key property that defines a catalyst?
It is not consumed in the reaction
What are negative catalysts also called?
What are negative catalysts also called?
Inhibitors
Which substance catalyses the decomposition of hydrogen peroxide ()?
Which substance catalyses the decomposition of hydrogen peroxide ()?
Manganese dioxide ()