Energy in Chemical Reactions

A _____________________ increase or decrease and the production of light are both signs that a chemical reaction may have occurred

• Reactants

• Products

• Thermal Energy

• Temperature

Tags

NGSS.HS-PS1-5

In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction?

• Energy is absorbed in the reaction.

• Energy is released in the reaction.

• There is no transfer of energy in the reaction.

Tags

NGSS.HS-PS1-4

Which of the following chemical reactions ABSORBS energy? There are 3 correct answers.

• photosynthesis

• activating a cold pack

• burning a candle

• baking bread

Tags

NGSS.HS-PS1-4

Does this chemical reaction energy curve show a reaction absorbing or releasing energy?

• releasing energy

• absorbing energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Scientists are looking into the decomposition of water (H₂O --> H₂ + H₂O) to make hydrogen fuel with the help of the Sun’s energy. What challenge do scientists face with this task?

• Decomposing water requires a high activation energy.

• The Sun isn't a renewable resource.

• Decomposing water results in toxic byproducts.

Which chemical reaction shows photosynthesis?

• carbon + oxygen → carbon dioxide

• water + carbon dioxide + sunlight → oxygen + glucose

• hydrogen + oxygen → water

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

A hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as _________.

• heat

• electrical energy

• chemical energy

In a chemical reaction, activation energy increases the __________________________of the reactants.

• amount of chemical energy

• number of particles

• temperature

Tags

NGSS.HS-PS1-4

Which of the following reactions RELEASE energy? (gets warm) There are 3 here.

• burning candle

• respiration in cells

• produces electric current

• baking bread

Tags

NGSS.HS-PS1-4

Does this chemical reaction curve show energy being released or absorbed?

• absorbed

• released

Tags

NGSS.HS-PS1-4