Thermochemistry Review

In an exothermic process, the surroundings are are gaining energy.

• True
• False

Tags

NGSS.HS-PS1-4

In an endothermic reaction the system is releasing energy.

• True
• False

Tags

NGSS.HS-PS1-4

Calorimetry Question:
A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C.  The final temperature of the system is 30.2°C.  What is the specific heat capacity of the metal? (show your work)

• 2.56 J/g°C
• 0.391 J/g°C
• 5.29 J/g°C
• 3.50 J/g°C

How much energy does it take to freeze 39.2 g of liquid benzene?  (ΔH_fus = 126 J/g, ΔH_vap = 394 J/g)  (Show your work)

• 4940 J
• -4940 J
• 15400 J
• -15400 J

Tags

NGSS.HS-PS3-4

How much energy does it take to boil 39.2 g of liquid benzene?  (ΔH_fus = 126 J/g, ΔH_vap = 394 J/g)  (Show your work)

• 4940 J
• -4940 J
• 15400 J
• -15400 J

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What letter represents boiling?

• B
• C
• D
• E

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What letter represents melting?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What letter represents a gas being cooled?

• B
• C
• D
• E

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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What letter represents a liquid being heated?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Calculate the heat transferred when 440 g of water cools from 87.2°C to 50.0°C.  (C = 4.18 J/g°C) (show your work)

• 68000 J
• 2.83 J
• -2.83 J
• -68000 J