Snapquiz - Rate of Reaction

Question 1. 270g of calcium carbonate is heated to 900°C for 30 minutes until it has completely thermally decomposed. What is the rate of reaction?

0.11 minutes per gram.
9g per minute.
0.033 minutes per °C.
0.3g per °C.

Question 2. 120g of magnesium is added to a 0.5 molar solution of sulphuric acid. After 15 minutes it is still reacting and it has produced 60cm³ of hydrogen gas. What is its rate of reaction?

0.5cm³ per gram.
4cm³ per minute.
8g per minute.
2g per cm³.

Question 3. When calculating the rate of change in chemistry, which variable will you usually be dividing by?

Time.
Mass.
Volume.
Concentration.

Question 4. When calculating the rate of change in chemistry, which variable could you be observing change?

Time taken.
Temperature of solution.
Odour.
Amount of product formed.

Question 5. Why is a high rate of reaction usually more desirable to industrial chemists?

Producing more product in a given time is usually safer.
Producing more product in a given time is usually easier.
Producing more product in a given time is usually purer.
Producing more product in a given time is usually cheaper.

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