24-25 Bond Energy and Potential Energy Diagrams TEST REVIEW

Instant ice packs like the one shown below change from room temperature to very cold when you activate them. Drag and drop the best statement about how this ice pack works once it's activated into the white box.

• pulling on the pack removes potential energy from it and cools it down

• a small refrigerator cools the pack down

• a chemical reaction in the pack occurs that releases energy

• a chemical reaction occurs in the pack that absorbs energy

Tags

NGSS.HS-PS1-4

Consider energy transfer during the chemical reaction of a burning candle. Drag and drop the best statement about this reaction into the white box.

• this chemical reaction of combustion releases energy

• this chemical reaction of combustion absorbs energy

• the candle doesn't have internal energy to release

• there is no energy transfer as the candle burns because it is at equilibrium

Tags

NGSS.HS-PS1-4

As water and sulfuric acid are mixed together the temperature of the mixture becomes very hot. Select the two statements that best describe why this happens. Assume that both substances start out at room temperature and there is no external heat source affecting them.

• A. A chemical reaction is occurring.

• B. Energy is released during the chemical reaction.

• C. Energy is absorbed during the chemical reaction.

• D. No chemical reaction occurs because water is inert.

• E. The lack of a chemical reaction causes the temperature to increase.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The figure on the left represents a(n) ​ (a)   reaction that is a

(b)   chemical reaction in which the total bond energies of the products are (c)   that of the reactants. The figure on the left depicts a (d)   change in which the total bond energies (e)   .

• exothermic
• less than
• physical
• stay the same
• chemical

Tags

NGSS.HS-PS1-4

Which of the following could indicate that a chemical change took place?

• change of color

• change in temperature or energy

• formation of gases

• all of the above

Tags

NGSS.MS-PS1-2

Energy diagram A and B are (a)   .

• endothermic / exothermic
• exothermic/endothermic

Tags

NGSS.HS-PS1-4

Below is an energy diagram for a certain chemical reaction. What is the total change in bond energy of the reaction? Note: bond energy is calculated the same as ΔH, reverse.

• -338 kJ

• 676 kJ

• 240 kJ

• -240 kJ

Tags

NGSS.HS-PS1-4

What is the activation energy of the product?

• -338 kJ

• 338 kJ

• 578 kJ

• -578 kJ

Tags

NGSS.HS-PS1-4

What is the activation energy of the reactants?

• -338 kJ

• 338 kJ

• 578 kJ

• -578 kJ

Tags

NGSS.HS-PS1-4

What does the 2 represent on the energy diagram?

• A) Energy of the reactants

• B) Change in energy between products and reactions, ΔH

• C) Activation Energy, Ea

• D) Energy of the products

Tags

NGSS.HS-PS1-4