Unit 1 - Part 2: Lesson 3 - Energy Changes in Chemical Reactions

What is required for atoms to break bonds during a collision?

• They need to be heated

• They must collide with the right amount of force

• They need to be in a liquid state

• They need a catalyst

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NGSS.HS-PS1-4

NGSS.HS-PS2-3

Which type of reaction absorbs more energy to break bonds than it releases?

• Combustion reaction

• Exothermic reaction

• Endothermic reaction

• Decomposition reaction

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NGSS.HS-PS1-4

Where does the energy in a chemical reaction primarily come from?

• The surrounding environment

• The chemical bonds of atoms

• The energy of light

• Kinetic energy of particles

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NGSS.HS-PS1-4

In an exothermic reaction, where is thermal energy located in the chemical equation?

• A) On the reactants' side

• B) On the products' side

• C) In the middle of the equation

• D) It does not appear in the equation

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is the main purpose of cellular respiration in organisms?

• To produce oxygen

• To break down glucose and release energy

• To store energy in glucose

• To form new cells

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NGSS.HS-LS1-7

What happens to energy during an endothermic reaction?

• It is released to the surroundings

• It is absorbed from the surroundings

• It is conserved within the products

• It remains unchanged

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NGSS.HS-PS1-4

Which of the following does the law of conservation of energy state?

• Energy can be created but not destroyed

• Energy is created and destroyed in reactions

• Energy is not created or destroyed, only transferred

• Energy cannot be stored in chemical bonds

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

In a cold pack, what happens to energy during the chemical reaction?

• It is released to the surroundings

• It is absorbed from the surroundings

• It is created by the reaction

• It is destroyed by the reaction

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NGSS.HS-PS1-4

What factor increases the reaction rate by causing more frequent collisions between particles?

• Decreased concentration

• Increased concentration

• Lower pressure

• Smaller surface area

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NGSS.HS-PS1-5

What is the effect of increasing reactant concentration on the reaction rate?

• The reaction rate increases

• The reaction rate decreases

• The reaction rate remains the same

• The reaction rate stops

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NGSS.HS-PS1-5