AP Thermochemistry

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

A liquid with a specific hear of 1.9 J/gC has 4750 J of energy added to it. The temperature changed from 20 degrees C to 30 degrees C, what is the mass of the liquid?

• 250 cal
• 2500cal
• 250 g
• 2500 cal

Tags

NGSS.HS-PS3-1

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

• 12.82 °C

• 24.12 °C

• 351 °C

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 0.10 J/g°C, what is the mass of the iron sample?

• 25 g

• 30 g

• 20 g

• 50 g

When 1500J of energy is lost from a 120 gram object, the temperature decreased from 45 ^oC to 40 ^oC. What is the specific heat of the object?

• 2.5 J/g^oC

• 1.5 J

• 12.5 Cal/g^oC

• 15 J/gC^-1

Calculate the ∆H for the following reaction: 2H₂O₂ → 2H₂O + 1 O₂

You are given these two equations:

2H₂ + O₂ → 2H₂O ∆H = -572 kJ

H₂ + O₂ → H₂O₂ ∆H = -188 kJ

• ∆H = -948 kJ

• ∆H = -196 kJ

• ∆H = -384 kJ

• ∆H = -188 kJ

Refer the the following question:
2N₂ + 3H₂ --> 2NH₃ + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?

• 92 kJ
• 0.143 kJ
• 23 kJ
• 15 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

In an _________________ process, the system gains heat from its surrounding

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

In an _____________ process, the system releases heat to its surrounding

• Exothermic

• Endothemic

Tags

NGSS.HS-PS1-4

What letter represents the activation energy?

• A

• B

• C

• D