Factors Affecting Reaction Rate

The factor that would NOT affect the rate of chemical reaction.

• Concentration

• Humidity

• Particle Size

• Temperature

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NGSS.HS-PS1-5

1. What is the effect of temperature rise on reaction rate?

• It increases molecular concentration and slows reaction rate.

• It increases the number of effective collisions among reactants, thus increasing the reaction rate.

• It decreases the system's energy and limits how much further reaction can take place.

• It decreases the number of collisions and the energy of molecules to limit further reaction.

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NGSS.HS-PS1-5

Which statement best describes the Collision theory?

• All collisions lead to chemical reactions.

• Most collisions lead to chemical reactions.

• Very few reactions involve particle collisions.

• Effective collisions lead to chemical reactions.

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NGSS.HS-PS1-5

The measure of how fast or slow a reaction happens.

• Activation Energy

• Collision theory

• Particle Size

• Rate of Reaction

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NGSS.HS-PS1-5

Grains of sugar has a greater surface area than a cube of sugar of the same mass.

• True

• False

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

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NGSS.HS-PS1-5

Conditions that needs to be met for a chemical reaction to occur.

• Substance must be homogeneous.

• Temperature should be kept constant.

• Particles should maintain a certain distance to each other.

• Particles in the substance must collide and have enough energy.

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NGSS.HS-PS1-5

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

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NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

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NGSS.HS-PS1-5

Why are many types of foods stored in refrigerators?

• At lower temperature, the chemical reactions that spoil food occur slower than usual.

• Refrigerators also contain enzymes that slow the rate of reactions that spoil the food.

• The volume inside the refrigerator decreases the concentration of the food particles, allowing them to decompose more slowly.

• Bacteria do not grow well in dark places.

Tags

NGSS.HS-PS1-5