Thermochemistry

What is the SI unit of energy?

• joule
• enthalpy
• calorimeter
• specific heat?

What is the heat content of a system at constant pressure?

• joule
• enthalpy
• calorimeter
• specific heat?

What is a device used to measure the heat absorbed or released during a chemical or physical change?

• joule
• enthalpy
• calorimeter
• specific heat?

What is the quantity of heat needed to change the temperature of 1 g of a substance by 1^oC?

• joule
• enthalpy
• calorimeter
• specific heat?

Tags

NGSS.HS-PS3-4

If a piece of aluminum is heated from 30.0^oC to 50.0^oC, what is the value of ΔT?

• 293.0K
• 20.0K
• 0.0K
• 80.0K

What would likely happen if you were to touch the flask in which an endothermic reaction were occurring?

• The flask would probably feel warmer than before the reaction started.
• The flask would feel the same as before the reaction started.
• The flask would probably feel cooler than before the reaction started.
• None of these.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A piece of metal is heated, then submerged in cool water.  Which statement below describes what happens?

• The temperature of the metal will increase.
• The temperature of the water will increase and the temperature of the metal will decrease.
• The temperature of the water will increase.
  
• The temperature of the water will decrease.

Tags

NGSS.HS-PS3-4

Which of the equations below is an example of a thermochemical equation?

• Mg + 2H₃O⁺ + Cl^- → Mg²⁺ + 2Cl^- + H₂ + H₂0
  →
• 2H₂(g) + 2O₂(g) → H₂O(g)
• Mg(s) + 2H₃O⁺(aq) + Cl^-(aq) → Mg²⁺(aq) + 2Cl^-(aq) + H₂(g) + H₂0(l)
• 2H₂(g) + 2O₂(g) → H₂O(g) + 483.6 kJ

Tags

NGSS.HS-PS1-4

Which of the following best describes energy in the form of heat?

• a measure of the average kinetic energy of the particles in a sample of matter
• the energy transferred between samples because of a difference in their temperatures
• bond energy
• the energy stored in a sample of matter

Tags

NGSS.HS-PS1-5

How much energy is needed to raise the temperature of 58.6 g of argon from 23.4^oC to 55.6^oC? The specific heat capacity of argon 0.520 J/g⋅K.

• 981 J
• 1671 J
• 1887 J
• 3.50 J

Tags

NGSS.HS-PS3-1