Classmates
How many roles are at each tables?
four
How many centimeters are in a meter?
100
In chemistry, does breaking a chemical bond require energy or release energy?
absorbs energy
What causes combustion in an engine?
increased pressure
If the temperature of a gas is doubled and the pressure is kept the same, what happens to the volume of the gas?
It doubles (since volume temperature have a direct relationship)
How many students are in this class?
35
How many mL are in 5 liters?
5000 mL
Between a C–C single bond, a C=C double bond, and a C≡C triple bond, which one has the highest bond energy (is the hardest to break)?
The C≡C triple bond
What is needed to make combustion?
fuel, oxygen, heat
A gas sample has a volume of 5 L at a pressure of 1 atm. If you increase the pressure to 2 atm while keeping the temperature constant, what is the new volume?
2.5 L
How many juniors are in the class?
3
How many hours are in 61200 seconds?
17 hours
If the energy released when new bonds form is greater than the energy needed to break the old bonds, is the overall reaction exothermic or endothermic?
Exothermic, (More energy is exiting the system than was taken in).
Incomplete combustion makes what products?
carbon and carbon monoxide
In any gas law calculation, what temperature scale must be used, and how do you convert 0°C to that scale?
Kelvin; add 273 (0+273 = 273 K)
How many students' names start with A in this class?
7 students
How many feet is the equivalent of 36.5 miles if one mile equals 5280 feet (using correct significant figures)?
193,000 feet
To calculate the total energy change (Delta H) of a reaction, you subtract the energy of the bonds formed from the energy of the bonds broken. If it takes 500 kJ to break bonds and 700 kJ are released when new ones form, what is the Delta H?
-200 kJ. Calculation: 500 - 700 = -200. (The negative sign indicates an exothermic reaction).
What is the main difference between gasoline and diesel engines?
gas uses spark plugs
A balloon has a volume of 10 L at 300 K and 1 atm. If the volume is decreased to 5 L and the temperature stays at 300 K, what is the new pressure?
The new pressure is 2 atm.
How tall is Miss Cassidy?
5'2
How many pounds are in 435 ounces if 16 ounces equals one pound?
27.2 ounces
Nitrogen gas (N2) is very unreactive and stable because it has a very high bond energy of 945 kJ/mol. What type of bond (single, double, or triple) holds the two nitrogen atoms together?
A triple bond. (The high energy value is a giveaway that the bond is extremely strong and difficult to pull apart).
What is used to reduce harmful emissions in a vehicle?
The catalytic converter
A gas occupies 2 L at 300 K and 2 atm. If the volume is increased to 4 L and the temperature is increased to 600 K, what is the new pressure?
2 atm.