Thermochemistry Review!

Chemical reactions that absorb energy are called

• endothermic
• fast
• slow
• exothermic

Tags

NGSS.HS-PS1-4

A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?

• 25g
• 30g
• 20g
• 50g

Tags

NGSS.HS-PS3-1

If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal? (show your work)

• 2.34 J/g°C
• 0.472 J/g°C
• 6.13 J/g°C
• 0.163 J/g°C

Tags

NGSS.HS-PS3-4

H₂ + 2 C + N₂ + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?

• Endothermic 
• Exothermic

Tags

NGSS.HS-PS1-4

What letter represents boiling?

• B
• C
• D
• E

Tags

NGSS.MS-PS1-4

What letter represents a liquid being heated?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How much energy does it take to freeze 39.2 g of liquid benzene (C₆H₆)?  (ΔH_fus = 9.08 kJ/mol, ΔH_vap = 28.4 kJ/mol)  (Show your work)

• 4.940 kJ
• -4.940 kJ
• 258 kJ
• -258 kJ

Tags

NGSS.HS-PS1-4

Will H be positive or negative in this reaction?

• positive
• negative

Tags

NGSS.HS-PS1-4

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• Reactant
• Product

Tags

NGSS.HS-PS1-4

Water exists as a _____________ at 700 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid