Thermochemistry Conversions

What does this graph represent?

• Exothermic Reaction
• Endothermic Reaction
• Nuclear Reaction
• Radiation

Tags

NGSS.HS-PS1-4

If ΔH = -95 J
Then...

• The system is losing 95 J to the surroundings
• Both the system and surroundings are losing 95 J
• The system is gaining 95 J from the surroundings
• Both the system and surroundings are gaining 95 J

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Calculate the amount of energy needed to convert 250. g of ice at - 25 °C to steam at 250.°C. The specific heat of water is 4.184 J/g * °C
(Answer is in correct sig figs)

• 2.88 x 10^5 J
• 2.9 x 10^5 J
• 287,650 J
• None of these

Tags

NGSS.HS-PS3-1

In an exothermic reaction:

• ΔH is positive because energy is gained
• ΔH is negative because energy is gained
• ΔH is positive because energy is lost
• ΔH is negative because energy is lost

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which equation would you use to solve for mass?

• Q = m * Cp * ΔT
• ΔT= Q / m * Cp
• M = Q/ Cp * ΔT
• E = mc^2

Tags

NGSS.HS-PS3-4

The Law of  Conservation of energy states:

• Energy can neither be created or destroyed
•  ΔE_System + ΔE_Surroundings = 0
• ΔE = q x w
• All of these

Tags

NGSS.HS-PS3-3

What is the term for the amount of energy absorbed or released in a chemical reaction?

• heat of vaporization
• heat of condensation
• heat of reaction
• heat of sublimation

Tags

NGSS.HS-PS1-4

During an endothermic reaction, heat content in the surroundings decreases because:

• all reactions need heat energy
• the reaction absorbs heat energy
• energy is given off by the reaction
• heat energy is destroyed during reactions

Tags

NGSS.HS-PS1-4

In an Endothermic Reaction, heat is transferred ____ the system, ____ the surroundings.

• from, to
• to, from
• from, from
• to, to

Tags

NGSS.HS-PS3-4

Chemical Energy is Potential Energy stored in the bonds of chemicals

• True
• False

Tags

NGSS.HS-PS1-4