According to the success criteria, what should students be able to explain?

• How different factors affect the rate of chemical reactions

• The structure of atoms

• The process of photosynthesis

• The properties of metals

What is an example of a factor that can affect the rate of chemical reactions, as mentioned in the learning intentions?

• Temperature

• Color

• Shape

• Sound

Which of the following is a method to measure the rate of gas production in a chemical reaction?

• Using a gas syringe or measuring cylinder to collect the gas produced

• Measuring the temperature change

• Observing the color change

• Using a pH meter

How can you measure the rate of mass loss during a chemical reaction?

• By using a thermometer

• By using an electronic balance to monitor mass change

• By using a stopwatch

• By using a ruler

What is a common method to measure the rate of solid consumption in a reaction?

• Measuring the time taken for a cross to disappear beneath the flask

• Measuring the increase in temperature

• Measuring the volume of liquid produced

• Measuring the change in color of the gas

What must happen for reactant particles to form products in a successful reaction?

• They must collide with one another.

• They must be heated.

• They must dissolve in water.

• They must be exposed to light.

What is activation energy in the context of a chemical reaction?

• The energy required for reactant particles to collide with at least a certain level of energy.

• The energy released when products are formed.

• The energy needed to cool down the reactants.

• The energy used to separate products.

Which of the following is NOT necessary for a successful chemical reaction according to the material?

• Reactant particles must dissolve in water.

• Reactant particles must collide with one another.

• Reactant particles must have at least a certain level of energy.

• Reactant particles must have activation energy.

What effect does increasing the concentration of reactants have on the rate of a chemical reaction?

• It increases the frequency of collisions between reactant molecules.

• It decreases the activation energy required for the reaction.

• It slows down the reaction rate.

• It changes the products formed in the reaction.

Why does a higher concentration of reactant molecules cause a reaction to move faster?

• Because it increases the frequency of collisions between molecules.

• Because it decreases the temperature.

• Because it changes the color of the reactants.

• Because it increases the activation energy.