Stoichiometry
How many moles of Oxygen gas are needed to react to form 25.0 grams of water (H2O)?
0.694 mol O2
Convert 25℃ to K.
298K
Is this equation endo or exo thermic? CaCO3 + heat → CaO + CO2
Endo
Determine the pH of a
1.0 x 10^-4 M solution.
4
What forms of radiation are emitted during radioactive decay?
Alpha particles, beta particles, and gamma rays
How many molecules of Oxygen gas are needed to react to form 3.0 moles of water (H2O)?
9.0 x 10^23 molecules O2
Convert 255K to ℃.
-18℃
Is this equation endo or exo thermic?
C3H8 + 5 O2 → 3 CO3 + 4 H2O + 2,200 KJ
Exo
Determine the pH of a
1.0 x 10^-3 M solution.
5
What type of particle is small, fast moving, carries a negative electrical charge, has medium penetrating ability and can be stopped by a few mm of metal or a block of wood
Beta Particles
How many liters of Oxygen gas are needed to react to form 12.0 liters of water vapor (H2O)?
6.00 L O2
How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25oC?
0.12 mol = n
If 4.50 g of water absorbs 276 J of energy, calculate temperature change of the water. The specific heat of water is 4.18 J/goC.
14.7ºC
Determine the pH if
[H+] = 6.5x10^-4
3.2
What type of radiation consists of high-energy electromagnetic waves and has high penetrating power, but no mass or charge?
Gamma Rays
Calculate the number of grams of NH3 formed by the reaction of 112.0 grams of H2.
629.9 g NH3
A high-pressure tank contains the following gases by pressure: Nitrogen 500.0 kPa, Oxygen 650.0 kPa, and Carbon Dioxide 2000 kPa. Calculate the total pressure inside the high-pressure tank of gases.
Ptotal = 3150 kPa
How many Calories from 1 serving size (30 g)? Given Amount of water=99.8g. Initial temp=-31.5ºC. Water Temp after= 48.6ºC. Amount burned= .32g
160 Cal
Determine the pH if [H+]=5.0×10−6[H^+] = 5.0 \times 10^{-6}[H+]=5.0×10−6
5.30
What type of particle is large, carries a positive charge, moves relatively slowly, and can be stopped by a sheet of paper or even skin?
Alpha Particle
How many moles of HCl can be produced by reacting 4.0 mol H2 and 3.5 mol Cl2? Which compound is the limiting reactant?
H2 + Cl2 → 2 HCl
8.0 mol HCl H2 = ER
7.0 mol HCL Cl2 = LR
500.0 liters of a gas is pumped into a high pressure tank at 50.0 atm and 200.0 °C. The tank is cooled to 20.0 °C. What is the volume of the gas if the pressure is 30.0 atm?
516 L = V2
A 500.0 g piece of iron is heated in a flame and dropped into 400.0 g of water at 10.0oC. The temperature of the water rises to 90.0oC. How hot was the iron when it was removed from the flame? (The specific heat of iron is 0.473 J/ g C)
656oC = TiFe
Determine the pH if [H+]=9.1×10−6[H^+] = 9.1 \times 10^{-6}[H+]=9.1×10−6
5.04
What type of radiation is composed of high-energy electrons, carries a negative charge, has medium penetration power, and can be stopped by a few millimeters of aluminum?
Beta particles