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Questions and Answers
What is the primary function of a catalyst in a chemical reaction?
What is the primary function of a catalyst in a chemical reaction?
How do enzymes function as catalysts in biological reactions?
How do enzymes function as catalysts in biological reactions?
What is a characteristic feature of enzymes?
What is a characteristic feature of enzymes?
What role does salivary amylase play in digestion?
What role does salivary amylase play in digestion?
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What would likely happen to chemical reactions in living organisms without enzymes?
What would likely happen to chemical reactions in living organisms without enzymes?
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What defines the rate of a chemical reaction?
What defines the rate of a chemical reaction?
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Which example demonstrates a low reaction rate?
Which example demonstrates a low reaction rate?
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What is activation energy?
What is activation energy?
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Which factor does NOT affect the rate of chemical reactions?
Which factor does NOT affect the rate of chemical reactions?
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How can the rate of a reaction be increased?
How can the rate of a reaction be increased?
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What effect does temperature have on reaction rates?
What effect does temperature have on reaction rates?
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Which of the following is a consequence of increased surface area in a reaction?
Which of the following is a consequence of increased surface area in a reaction?
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What role does a catalyst play in a chemical reaction?
What role does a catalyst play in a chemical reaction?
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What effect does increasing temperature have on the reaction rate?
What effect does increasing temperature have on the reaction rate?
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How is concentration defined in the context of reactions?
How is concentration defined in the context of reactions?
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Why does increasing surface area lead to a higher reaction rate?
Why does increasing surface area lead to a higher reaction rate?
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What is the relationship between reaction rate and concentration?
What is the relationship between reaction rate and concentration?
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Which method can be used to increase surface area?
Which method can be used to increase surface area?
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What role do catalysts play in chemical reactions?
What role do catalysts play in chemical reactions?
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How does the physical state of a substance affect its concentration?
How does the physical state of a substance affect its concentration?
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Which statement correctly explains the relationship between particle collisions and reaction rates?
Which statement correctly explains the relationship between particle collisions and reaction rates?
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Study Notes
Factors Affecting Reaction Rate
- Rate of reaction: How quickly reactants turn into products
- Fast reaction = high reaction rate
- Slow reaction = low reaction rate
- Examples: explosion (fast), rusting (slow)
Collision Theory
- Reactions occur when particles collide
- Particles must collide with sufficient energy for reaction to occur
- Activation energy: Minimum kinetic energy needed for reaction
- Particles need enough energy to break bonds in reactants
Factors Affecting Reaction Rate (Main Four)
-
Temperature:
- Higher temperature = more energy = faster movement of particles = more frequent collisions = faster reaction
- Lower temperature = less energy = slower movement of particles = fewer collisions = slower reaction
-
Concentration:
- Higher concentration = more particles in a given volume = more frequent collisions = faster reaction
- Lower concentration = fewer particles = fewer collisions = slower reaction
-
Surface Area:
- Larger surface area = more exposed particles = more frequent collisions = faster reaction
- Smaller surface area = fewer exposed particles = fewer collisions = slower reaction
-
Catalysts:
- Substances that speed up reaction rate without being consumed
- Catalysts lower activation energy, making reactions easier
- Enzymes: Biological catalysts in living organisms (e.g., salivary amylase)
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Description
This quiz explores the factors affecting reaction rates in chemical processes. Key concepts include collision theory, the impact of temperature, concentration, and surface area on reaction speed. Test your understanding of how these elements influence the rate at which reactants convert to products.