Chemistry Unit 5: Fuels - Review Questions

Which of the following statements best describes an exothermic reaction?

• The reaction absorbs energy from the surroundings.

• The reaction releases energy to the surroundings.

• The reaction does not involve any energy change.

• The reaction only occurs at high temperatures.

Tags

NGSS.HS-PS1-4

In an endothermic reaction, the energy of the products is:

• Lower than the energy of the reactants.

• Higher than the energy of the reactants.

• Equal to the energy of the reactants.

• Unrelated to the energy of the reactants.

Tags

NGSS.HS-PS1-4

Which of the following is an example of an exothermic reaction?

• Photosynthesis

• Melting of ice

• Combustion of gasoline

• Evaporation of water

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NGSS.HS-PS1-4

The bond formation in chemical reactions is generally:

• Endothermic

• Exothermic

• Neither endothermic nor exothermic

• Both endothermic and exothermic, depending on the reaction

Tags

NGSS.HS-PS1-4

What is required for an endothermic reaction to proceed?

• Release of energy

• Absorption of energy

• Decrease in temperature

• Increase in pressure

Tags

NGSS.HS-PS1-4

During a chemical reaction, if the surroundings become warmer, the reaction is most likely:

• Endothermic

• Exothermic

• Neither, as temperature change is not related to energy changes in reactions

• Both, as reactions can both absorb and release energy simultaneously

Tags

NGSS.HS-PS1-4

Which of the following statements is true about energy changes in chemical reactions?

• Energy is only absorbed, never released.

• Energy is only released, never absorbed.

• Energy can be either absorbed or released, depending on the reaction.

• Energy is neither absorbed nor released in chemical reactions.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

The term "enthalpy" in the context of chemical reactions refers to:

• The total kinetic energy of the reactants

• The heat content of a system at constant pressure

• The electrical energy produced by the reaction

• The amount of light emitted by the reaction

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

Tags

NGSS.HS-PS1-4

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm
• Cold

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NGSS.HS-PS1-4