Thermochemistry
Define This!
Change This!
Graph This!
Calculate This!
What’s That?
Answer: Endothermic
200
A process that absorbs energy is said to be __________.
400
Answer: surroundings
The part of the universe that is not the system is called the _______.
600
Answer: calorimetry
An experimental technique for determining the heat transfer in a chemical or physical change which relies on the Law of Conservation of Energy and a known sample of water.
800
Answer: specific heat
The amount of energy required to raise the temperature of one gram of a sample by one oC.
1000
Answer: Law of Conservation of Energy
What law does calorimetry depend on?
200
Answer: freezing
What is the phase change called when liquid iron changes to solid iron at 2800oF?
400
Answer: sublimation
What is it called when solid iodine changes directly into gaseous iodine?
600
Answer: melting, vaporization, and sublimation
Identify the following processes that are endothermic:
melting, vaporization, freezing, deposition, condensation, sublimation
800
Answer: they become stronger
What happens to the strength of the intermolecular forces when a substance undergoes condensation?
1000
Answer: the heat is breaking the intermolecular forces between the particles of the substance
Why doesn’t the temperature of a substance change when it melts even though heat is still being added?
200
Answer: heating curve
What is the following diagram called?
400
Answer: gas
What state of matter is present at point D?
600
Answer: 1500oC
What is the melting point of the substance?
800
Answer: sublimation
As you move from point A to point D at constant temperature, what phase change will occur?
1000
Answer: 70oC
At what temperature does this substance freeze?
200
Answer: -30.oC
What is ΔT when the temperature of water cools from 55oC to 25oC?
400
Answer: 4050 J
How much heat is required to heat a 125 g piece of titanium (specific heat = 0.540 J/goC) is heated from 40.0oC to 100.0oC
600
Answer: -2300 J
If a 135 g sample of water (C = 4.184 J/goC) is heated from 22oC to 26oC in a calorimetry experiment, how much heat was added to the water?
800
Answer: qmetal = - qwater
In a calorimetry experiment to determine the specific heat of a piece of metal, how does the heat change in the water compare to the heat change of the metal?
1000
Answer: 45 g
An aluminum spoon (specific heat 0.88 J/g°C) at 24 °C is placed in 180 mL (180 g) of coffee (specific heat 4.18 J/g°C) at 85 °C and the temperature of the coffee and spoon reaches 81.95oC. What is the mass of the spoon?
200
Answer: 26.2 miles
What is the distance of a marathon?
400
Answer: Austin
What is the capital of Texas
600
Answer: Michelangelo
What artist created the famous statue of David (shown below)?
800
Answer: Mike Johnson
Who is the current Speaker of the House?
1000
Answer: Okapi
What kind of animal is shown below?