Chemical Reaction

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

• The energy needed for a reaction to occur

• The minimum amount of energy needed for a reaction to potentially occur

• The energy added by a catalyst

• The energy possessed by the products

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

• Catalyst

• Acid

• Base

• pressure

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

• concentration

• surface area

• temperature

• reactants

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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

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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

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In an endothermic reaction, heat is ...

• taken in or absorbed

• given out or released 

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Increasing the temperature of the reactants can do which of the following?

• Slow collision frequency thus increasing reaction rate

• Allow less effective collision between the particles thus increasing reaction rate

• Cause particles to lose speed thus decreasing reaction rate

• Increase collision between the particles thus increasing the rate

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NGSS.HS-PS1-5

Which of the following slows down the rate of a chemical reaction?

• placing the reactants in hot water

• placing the products in ice bath

• placing the reactants in a ice bath

• stirring the reactants with a stirring rod

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If more reactants are used in a chemical reaction, more products will be produced. This is because

• More reactants cause the reaction to heat up

• More reactants take up the same volume

• More reactants have more atoms to react to form more products

• Too many products can slow down the reaction

Tags

NGSS.HS-PS1-5

In a chemical reaction, if the reactants are heated, the reaction usually happens

• Faster

• Slower

• At the same rate

• In a smaller volume

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