Chem B: Rates of Reaction and Equilibrium

Rate of chemical reaction means

• amount of product formed
• speed of reaction
• concentration of reacting particles
• combining reactants with products

Tags

NGSS.HS-PS1-5

A substance that increases speed of chemical reaction without being being changed is called:

• Catalyst
• Acid
• Base
• pressure

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NGSS.HS-PS1-5

Activation energy is required to start a chemical reaction. What is activation energy?

• The maximum amount of energy used
• The minimum amount of energy required to cross the reaction barrier
• The energy of the reactants
• The energy possessed by the products

Tags

NGSS.HS-PS1-4

Increasing the pressure of a reacting vessel only affects:

• Gaseous reactants
• Solid reactants
• Liquid reactants
• None of the above

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NGSS.HS-PS1-5

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

Reactions that give out heat to the surrounding are classified as one of the following:

• Spontaneous
• Sluggish
• Exothermic
• Endothermic

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collisions between the particles
• Neutralize the reaction
• increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

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NGSS.HS-PS1-5

In an endothermic reaction the products have 

• more energy than the reactants
• less energy than the reactants
• the same energy as the reactants
• no energy

Tags

NGSS.HS-PS1-4

In an exothermic reaction the products have

• more energy than the reactants
• the same energy as the reactants
• less energy than the reactants
• no energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1