Enter Title

Classmates

100

1. How many people are in the class?

A=32

200

Who is the teacher?

Ms. Casey

300

how many people in this class have blond hair?

12

400

how many boys are in this class

13

500

how many girls are in this class

14

Unit conservation

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

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

300

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

A=298.15 K

400

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

A= 1,046kJ

500

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

A= 1.48atm

Chemical bonds energins

100

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

Answer: What is a Spark Plug?

200

The minimum energy needed to start a reaction.

Answer: What is Activation Energy?

300

In order to Break a Bond what must you do?

Answer: You must add energy.

400

What are the electrons that do the bonding called?

Answer: Valence Electrons.

500

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

Answer: Yes.

Combustion and engines

100

Is an engine reaction endothermic or exothermic?

Answer: It is exothermic.

200

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

Answer: High energy.

300

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

Answer: The reaction stops immediately.

400

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

Answer:False

500

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

Answer:/true

Combined gas laws

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

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

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

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

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

A= The amount of gas (moles, n)