Experiments
What observation is made when magnesium reacts with hydrochloric acid?
A gas is released, and bubbles are seen.
How does increasing temperature affect particle movement?
Particles move faster.
What happens when the concentration of reactants increases?
More particles collide per unit volume.
Which reacts faster: a solid cube or a powdered solid?
a powdered solid
What does a catalyst do?
Lowers the activation energy of a reaction.
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Why does temperature increase reaction rate?
It increases the energy of collisions.
What effect does higher concentration have on reaction rate?
It increases the rate.
Why does smaller particle size increase reaction rate?
It provides a larger surface area for collisions.
Does a catalyst get used up in the reaction?
No, it remains unchanged.
What gas is produced when calcium carbonate reacts with hydrochloric acid?
Carbon dioxide
What happens to the reaction rate at very low temperatures?
It slows down.
Why does low concentration slow a reaction?
Fewer collisions occur between particles.
Does surface area affect gas reactions?
No, only solid reactants are affected.
What type of energy does a catalyst affect?
Activation energy.
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Does temperature affect activation energy?
No, it only affects particle energy.
If the concentration of hydrochloric acid is doubled, what happens to the rate of reaction with magnesium?
It doubles.
What happens to the rate when surface area decreases?
The rate decreases.
Why are catalysts important in industry?
They speed up reactions and save energy.
What is the visual indication of reaction progress in an experiment with sodium thiosulfate and hydrochloric acid?
Formation of a precipitate
What is the effect of temperature on the number of successful collisions?
It increases the number of successful collisions.
What happens when the concentration of a reactant increases?
There are more particles per unit volume, leading to more collisions.
What does a larger surface area mean for collisions?
More collisions can occur.
Which of the following is an example of a catalyst?
A) Oxygen in combustion reactions
B) Iron in the Haber process
C) Sodium chloride in electrolysis
D) Water in hydration reactions
B) Iron in the Haber process