Measuring rate - Changes in rate

What is the statement below that correct about rate of reaction?

• amount of product that has been used up in a given time

• amount of product that has been made in a given time

• amount of reactant that has been used up in a given time

• amount of remaining reactant in a given time

Mr. Awal is reacting magnesium ribbon and hydrochloric acid. What is the gas produced?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

This apparatus can be used to measure the rate of reaction that producing ...

• solid substance

• liquid

• gas

• aqueous solution

When you plot a graph, sometimes you find one result that does not fit the pattern. This is called ... result.

• annotation

• anomalous

• anatomy

• anthropology

Calcium carbonate (marble chips) is reacted with hydrochloric acid on the balance. If the cotton wool is removed, what is the name of gas that escaped from the glass?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

At what time the reaction is stopped?

• 1 minute

• 2 minutes

• 5 minutes

• 7 minutes

What is the rate of reaction at 3 minutes?

• 10 gram/minute

• 20 gram/minute

• 30 gram/minute

• 40 gram/minute

At the beginning of reaction, the curve of graph is steep. It means that the reaction is ...

• fast

• slow

• stopped

When the curve of graph is flat, so the reaction is ...

• fast

• slow

• stopped

For a chemical reaction to take place (happen), the particles of reactants have to collide each other with ... energy

• less

• enough

• a lot of