Y9 Rates of reaction - Mr Pike | Biblioteka

Instrukcije

Formative Generation Completed!

1

What generally happens to rate of reaction as temperature increases?

It slows down

It speeds up

It stays the same

It becomes unpredictable

1

Can changing the concentration of reactants alter the rate of reaction?

Tačno

Netačno

1

What is the role of a catalyst in a chemical reaction?

Speeds up the reaction

Slows down the reaction

Stops the reaction

Has no effect

1

Which factors can increase the rate of a chemical reaction?

Increasing temperature

Adding a catalyst

Increasing concentration of reactants

Using bigger reaction vessels

1

What happens to the rate of reaction when the surface area of a solid reactant is increased?

Increases

Decreases

Stays constant

Becomes zero

1

The rate of a reaction refers to how quickly reactants are used up or products are formed.

Tačno

Netačno

1

Which of the following are true about the rates of reactions at equilibrium?

The forward and reverse rates are equal

The concentration of the reactants and products remains constant

The reaction has stopped

The rate can still be changed by changing the temperature

1

Which graph correctly shows how rate of reaction changes with increasing temperature?

Steeply rising

A flat line

Falling steadily

A line with peaks and troughs

1

A catalyst lowers the activation energy of a reaction.

Tačno

Netačno

1

Which of these would increase the rate of a gas reaction?

Increasing the temperature

Increasing the pressure

Increasing the volume of the container

Adding a catalyst

1

What is meant by the term 'rate equation' in terms of rate of reaction?

It is a mathematical equation that shows how the rate of reaction depends on the concentration of reactants

It is a prediction of the total rate of reaction

It refers to the equation of the chemical reaction itself

It refers to the balance between the forward and reverse rates at equilibrium

1

All reactions proceed at the same rate under equivalent conditions.

Tačno

Netačno

1

What effect does a decrease in concentration have on the rate of reaction?

Decreases the rate of reaction

Increases the rate of reaction

Makes no difference to the rate of reaction

Stops the reaction

1

In a reaction diagram, what does the peak of the curve represent?

The reactants

The products

The activation energy

The overall energy change

1

Pressure only affects the rate of reaction for reactions involving gases.

Tačno

Netačno