N5 1.1 Rates of reaction

Flashcards covering key concepts related to chemical reaction rates, factors affecting them, and measurement techniques.

Reaction rate

Describes how quickly products are formed during a chemical reaction.

End-point

The point in time when the reaction is complete (no more products formed).

Catalyst

A substance that speeds up chemical reactions but can be recovered chemically unchanged at the end of the reaction.

Effect of decreasing particle size on reaction rate

Increases the reaction rate.

Effect of increasing concentration on reaction rate

Increases the reaction rate.

Effect of increasing temperature on reaction rate

Increases the reaction rate.

Method to collect a soluble gas

Gas syringe.

Reason for reaction rate decrease as reaction proceeds

The reactants are getting used up.

During a reaction, the mass of gas produced was measured in g. Time was measured in s.

Average rate will have units of …

g s^-1 

 During a reaction, the volume of gas produced was measured in cm³. Time was measured in min. Average rate will have units of …

cm³ min^-1

If a reactant is ___________, adding more of it will not make more products.

in excess

Method to collect an insoluble gas

Inverted measuring cylinder or gas syringe.

Method to monitor reaction rate without collecting a gas

Measuring mass loss.

At which point (A. B or C) is the reaction complete?

C

Reaction rate can be increased by decreasing the…

particle size

Reaction rate can be increased by adding a …

catalyst

State the formula used to calculate average rate. Where can you find it?

rate = change in quantity / change in time

Can be found in the data booklet

Draw a diagram of a gas syringe

Draw a diagram of collecting a gas over water.

A reaction between zinc powder and sulfuric acid produced graph A.

Which graph will be produced if zinc lumps are used?

B

 Reaction C was carried out using an excess of zinc and 1M sulfuric acid.

Which curve shows the reaction progress when 2M sulfuric acid was used?

A