Snapquiz - Collision Theory

Question 1. Some catalysts are very expensive. Why is it still economical to use them in some cases?

They aren't used up in a reaction.
They're the only way to manufacture a product.
If they weren't used for the reaction they would just go to waste.
The manufacturers can buy them cheaper in bulk.

Question 2. Which conditions would give the slowest reaction?

A 5°C starch solution with a 5% amylase solution.
A 30°C starch solution with a 5% amylase solution.
A 30°C starch solution with a 20% amylase solution.
A 5°C starch solution with a 20% amylase solution.

Question 3. Why are catalysts desirable to manufacturers?

They allow reactions to happen more safely.
They increase the cost, making the products more valuable.
They slow the rate of a reaction, allowing it to be carefully controlled.
They allow reactions to happen at lower temperatures, reducing heating costs.

Question 4. Why does a spoonful of granulated sugar dissolve more quickly than a sugar lump of equal mass?

People stir their drinks more when they use granulated sugar.
It has greater surface area.
The particles can move faster.
It raises the temperature of the liquid.

Question 5. Why does increasing surface area increase the rate of reaction?

There's more chance of particles colliding because there's a greater area for them to come into contact.
There's more chance of particles colliding because there's more of them in a given volume.
There's more chance of particles colliding because they're moving faster.
There's more chance of particles colliding because there's a place for them to meet.

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