Starter quiz
- How can we increase the rate of a reaction?
- increase the surface area of a solid reactant ✓
- increase the volume of a reacting solution in excess
- decrease the volume of a reacting solution in excess
- increase the concentration of a reacting solution ✓
- decrease the concentration of a reacting solution
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- According to the collision theory, what must happen for a reaction to occur?
- particles must collide with sufficient energy ✓
- particles must collide with energy lower than the activation energy
- particles must collide without any energy
- particles must move in opposite directions
- particles must move in opposite directions with the activation energy
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- Which equipment can be used to measure the volume of gas in a rate of reaction investigation?
- a gas syringe ✓
- a stopwatch
- a thermometer
- a pipette
- an upturned measuring cylinder ✓
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- The rate of reaction can be defined as:
- the total energy produced in a reaction
- the amount of reactant used per unit time ✓
- the amount of product made per unit time ✓
- the time it takes for the reaction to start
- the maximum temperature reached during the reaction
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- If 10 grams of a reactant are used up in 5 seconds, what is the rate of reaction?
- 0.2 g/s
- 0.2 cm³/s
- 0.2 cm³/s²
- 2 g/s ✓
- 2 cm³/s
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- What is activation energy?
- the energy needed to form new chemical bonds
- the energy released during the reaction
- the minimum energy required for particles to react upon collision ✓
- the maximum energy that particles can have when colliding
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Exit quiz
- What does a graph of volume of gas produced against time show?
- the total amount of reactants
- the changing rate of the reaction ✓
- the pH change over time
- the temperature change over time
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- What is a common error when using a measuring cylinder to measure the amount of gas produced during a reaction?
- incorrect pH readings
- parallax error in reading volumes ✓
- using too much reactant
- incorrect temperature measurement
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- Why does increasing the concentration of a reacting solution increase the rate of reaction?
- it decreases the activation energy
- it increases the energy of the particles
- it increases the frequency of collisions ✓
- it changes the state of the reactants
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- Why does increasing the concentration of a solution increase the frequency of particle collisions?
- more energy is added to the system
- more particles are present in the same volume ✓
- the temperature increases
- the pressure decreases
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- When reacting excess acid with equal amounts of magnesium, how does the concentration of acid affect the volume of gas produced?
- higher concentration produces more gas
- lower concentration produces more gas
- the same volume of gas is produced for all concentrations ✓
- no gas is produced
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- To ensure a fair test when investigating how concentration affects rate of reaction, which of the following must be kept constant?
- concentration of the reactant solution
- surface area of the solid reactant ✓
- volume of gas produced
- time taken for a certain volume of gas to be produced
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The changing rate of a reaction can be found by measuring the amount of gas produced as the reaction progresses.
- Increasing concentration of a reacting solution introduces more reactant particles, so they collide more frequently.
- When reacting excess acid with equal amounts of magnesium, the same volume is produced for all concentrations of acid.
Common misconception
Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced.
The slide deck uses graphical data to show that the same volume of gas is produced when different concentrations are used, so long as the reacting solution is in excess.
Keywords
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.
Independent variable - The independent variable is the single variable that is changed in an investigation.
Dependent variable - The dependent variable is the single variable that is measured or observed in an investigation.
Control variables - The control variables are variables that are kept constant in an investigation.
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