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Classmates
Unit conservation
Chemical bonds energins
Combustion and engines

Combined gas laws
100

  1. How many people are in the class?

A=32

100

  1. A chemical reaction releases 450.0kj of heat. Convert this energy into kilocalories (kcal), given that 1 cal= 4.184 J

A=107.6 Kcal

100

The part of a car that provides the "spark" to start the fuel reaction.

Answer: What is a Spark Plug?

100

Is an engine reaction endothermic or exothermic?

Answer: It is exothermic.

100

  1. A gas occupies 2.0 L at 1.0 atm and 273 K. If pressure increases to 2.0 atm and temperature to 546 K, what is the new volume?

A=2.0 L

200

Who is the teacher?

Ms. Casey

200

  1. A gas cylinder is at a pressure of 2.5 atm. What is this pressure in mmHg (1 atm = 760 mmHg)?

A=1,900 mmHg

200

The minimum energy needed to start a reaction.

Answer: What is Activation Energy?

200

Is gasoline a "high energy" or "low energy" fuel?

Answer: High energy.

200

  1. A balloon has a volume of 5.0 L at 300 K and 1.5 atm. What is the volume at STP (273 K and 1.0 atm)?

A=6.825 L

300

how many people in this class have blond hair?

12

300

 3. Convert a temperature of 25°C to Kelvin.

A=298.15 K

300

In order to Break a Bond what must you do?

Answer: You must add energy.

300

Combustion needs three things: Fuel, Oxygen, and Heat. What happens if you take the Oxygen away?

Answer: The reaction stops immediately.

300

  1. If a gas at 2.0 atm and 3.0 L is heated from 200 K to 400 K while the volume stays constant, what is the new pressure?

A= 4 atm

400

how many boys are in this class

13

400

 4. An energy bar contains 250 kilocalories (kcal). How many kilojoules (kJ) is this?

A= 1,046kJ

400

What are the electrons that do the bonding called?

Answer: Valence Electrons.

400

T/F: Energy is created from nothing inside an engine.

Answer:False

400

  1. A sample of gas at 10.0 L and 2.0 atm is compressed to 5.0 L while the temperature drops from 300 K to 150 K. What is the new pressure?

A= 2 atm

500

how many girls are in this class

14

500

 5. A pressure sensor reads 150 kPa. Convert this value to atmospheres (1 atm = 101.325 kPa).

A= 1.48atm

500

Is energy released when two atoms "snap" together into a bond?

Answer: Yes.

500

T/F: Breaking a chemical bond is like pulling two magnets apart.

Answer:/true

500

  1. What must remain constant for the Combined Gas Law to be applicable?

A= The amount of gas (moles, n)