Thermochemistry Intro

The mass of a sample is 12g. There’s a temperature change from 20°C to 35°C when it absorbed 500 J of heat. What is the specific heat of this sample?

• 8.67 J/g•°C

• 2.78 J/g•°C

• 1.23 J/g•°C

• 108.67 J/g•°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat is produced when 57 grams of Lead is heated from 45°C to 67°C. The specific heat of Lead is 0.128 J/g•°C.

• 8.289 Joules

• 185,142 Joules

• 185.142 Joules

• 160.512 Joules

Tags

NGSS.HS-PS3-4

The amount of heat that raises the temperature of 1 g of pure water 1°C

• energy

• calorie

• heat capacity

• exothermic process

Tags

NGSS.HS-PS3-4

The capacity to do work or to supply heat

• heat capacity

• specific heat

• enthalpy

• energy

Tags

NGSS.HS-PS3-4

A 50 gram sample of delicious pork rinds is placed in an open, constant pressure calorimeter that contains 3000 grams of water. The temperature of the water increases by 47℃ when the pork rinds are combusted. The heat capacity for water is 4.184 J/g ∙ ℃. Assume the heat lost to the calorimeter itself or to the air is negligible. Which of the following is correct for the SYSTEM?

• ∆H = -590 kJ

• ∆H = +590 kJ

• ∆H = -11.8 kJ

• ∆H = +11.8 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What type of reaction is this?

• Exothermic

• Endothermic

• Kinetic

• Potential

Tags

NGSS.HS-PS1-4

Twenty tortilla chips are combusted in a bomb calorimeter surrounded by 5 liters of water. The temperature of the water increases from 30℃ to 35℃. Assuming the heat capacity of the water is about 4 J/g∙ ℃ and the heat capacity of the calorimeter 2000 J/℃, what is the energy content of a single tortilla chip?

• 100 kJ

• 110 kJ

• 5.5 kJ

• 5 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

the study of energy changes that occur during chemical reactions and changes in state

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

H₂ + ½ O₂ --> H₂O + 285kJ is an example of a(n)

• Electrical equation

• Heat equation

• Thermochemical equation

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Predict the sign (+, -, or 0) of ∆G_f°, ∆H_f°, ∆S_f°, respectively, for the deposition of carbon dioxide (CO₂) at room temperature and atmospheric pressure. CO₂ (g) → CO₂ (s)

• -, +, +

• 0, +, +

• -, +, -

• +, -, -

Tags

NGSS.HS-PS1-4