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WorksheetsFactors Affecting Chemical Reactions Mastery Test
Total questions: 25
Worksheet time: 13mins
Who proposed the concept of activation energy in 1888?
Amadeo Avogadro
Antoine Lavoisier
Svante Arrhenius
John Dalton
What is the minimum energy required for a chemical reaction to occur?
Activation energy
Chemical energy
Potential energy
Kinetic energy
Which of the following does not affect the rate of a chemical reaction?
Surface area of reactants
Concentration of reactants
Type of chemical bonds
Presence of a catalyst
Which term describes the peak energy level of a chemical reaction diagram?
Reaction rate
Activated complex
Chemical bond
Temperature
What is the purpose of a catalyst in a reaction?
To lower the activation energy
To increase the activation energy
To stop the reaction
To change the products
Which factor explains why rusting occurs faster in coastal areas?
Presence of more oxygen
Higher humidity and salt concentration
Lower temperature
Smaller surface area
Why does increasing the temperature speed up a reaction?
It lowers the activation energy
It increases the number of successful collisions
It decreases the concentration of reactants
It removes energy from the system
How does increasing the concentration of reactants affect the reaction rate?
It increases the frequency of collisions
It decreases the activation energy
It changes the chemical equation
It lowers the temperature of the reaction
Which factor explains why finely ground sugar dissolves faster than sugar cubes?
Temperature
Surface area
Catalyst
Concentration
How do enzymes speed up biological reactions?
By increasing activation energy
By acting as catalysts
By reducing the concentration of reactants
By lowering the temperature
What happens when a chemical reaction reaches equilibrium?
Reactants stop forming products
The forward and reverse reactions occur at the same rate
The reaction stops
The activation energy increases
A chef wants to preserve meat for a longer period. Which of the following methods would slow down bacterial growth?
Increasing the temperature
Storing it in a refrigerator
Keeping it at room temperature
Adding more oxygen
A student is dissolving salt in water and finds that it dissolves faster in warm water than in cold water. What factor is affecting the rate of dissolution?
Catalyst
Temperature
Surface area
Concentration
Why do manufacturers powder detergent rather than sell it in bars?
It reduces the amount of soap used
It lowers the temperature requirement
It increases the surface area for faster dissolution
It makes the detergent more expensive
Why is it advisable to cut vegetables into smaller pieces before cooking?
To increase their surface area for better heat absorption
To increase the activation energy
To decrease the temperature of cooking
To reduce the number of collisions between molecules
If a factory wants to speed up the rusting process of iron, which of the following should it increase?
The temperature and oxygen exposure
The concentration of nitrogen gas
The presence of a strong acid
The cooling rate of the iron
Why do fruits ripen faster when placed in a sealed bag with bananas?
The bag increases oxygen levels
The bananas release ethylene gas, which speeds up ripening
The bag increases humidity and removes oxygen
The bananas act as a catalyst for the reaction
Why does increasing the concentration of acid in industrial waste increase environmental damage?
It increases the rate of chemical reactions causing corrosion
It reduces the effect of pollution
It helps in neutralizing toxic substances
It decreases the reactivity of metals
A company is designing a product to prevent corrosion of bridges. Based on what you know about chemical reaction rates, which solution would be most effective?
Using paint or coating to prevent exposure to air and moisture
Increasing the temperature to accelerate oxidation
Increasing the concentration of acid in the air
Using a catalyst to speed up rust formation
If you were designing a fire prevention system for a warehouse, which factor would you focus on reducing?
Concentration of oxygen
Temperature of the room
Presence of a catalyst
Surface area of materials
Increasing the temperature always decreases the rate of a chemical reaction.
True
False
A catalyst speeds up a reaction without being consumed in the process.
True
False
Decreasing the surface area of reactants increases the reaction rate.
True
False
Corrosion occurs faster in a warm, humid environment.
True
False
Collision Theory states that molecules must collide with proper orientation and enough energy to react.
True
False
