Thermodynamics Practice

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

Temperature is a measure of average [blank] energy of individual atoms.

• heat
• potential
• mechanical
• kinetic

Tags

NGSS.HS-PS3-2

Formula for solving specific heat problems

• q = msΔT

• H = ΔH x moles

• H = ΔH x grams

• products - reactants

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

ΔH value in an exothermic reaction is a positive number.

• True

• False

Tags

NGSS.HS-PS1-4

A catalyst works by

• changing the order of the reaction

• increasing the temperature

• lowering the activation energy

• decreasing the amount of product

For which of these processes is the value of ΔH expected to be positive?

1. The temperature increases when calcium chloride dissolves in water.

2. Steam condenses to liquid water

3. Water boils

4. Dry ice sublimes (changes) to vapor

• 4 only

• 1 only

• 3 and 4 only

• 2 and 3 only

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Tags

NGSS.HS-PS1-4

 _?_  is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.

• Specific heat
• A calorie
• Thermal energy
• Conduction

As 120 g of hot milk cools in a mug, it transfers 20, 000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 2.6 J/g·°C. (Q=msΔT)

• 64 °C

• 1.56 °C

• 640 °C

• cannot be determined

Tags

NGSS.HS-PS3-4

A student calculates the heat of combustion of a biscuit from an experiment to be 28.5kJ /g. The packet suggest that the heat of combustion is 30.2kJ/g. What is the experimental percent error of this data?

• 0.94%

• 5.63 %

• 94.0%

• 3.12%