Chemical Quantities
The part of a balanced equation that gives the relative numbers of molecules.
What is coefficient?
The first step when calculating mass of a reactant/product from a chemical equation.
What is balance the equation for the reaction?
Heat flow is into a system
What is endothermic process?
A thermodynamic quantity equivalent to the total heat content of a system.
What is enthalpy?
Movement of electrons
What is electrical energy?
Allows us to convert from moles of one substance in a balanced equation to moles of a second substance in the equation.
What is mole ratio?
Comparison of the actual yield of a product to its theoretical yield
What is percent yield?
Ability to do work or produce heat
What is energy?
A device used to measure enthalpy.
What is a calorimeter?
Energy of height
What is gravitational energy?
2.3 grams of H2SO4 in moles.
What is 0.023 moles?
Contains the relative amounts of reactants that match the numbers in a balanced equation
What is stoichiometric mixture?
Measure of the random motions of the components of a substance
What is temperature?
What happens to H when the reaction is reversed.
What is the sign of H is reversed/flipped?
Energy doesn't disappear; it changes to another __________.
What is form?
Propane, C3H8, is a common fuel used for heating in rural areas. Predict the number of moles of CO2 formed when 3.74 moles of propane is burned in excess oxygen.
C3H8 + 5O2 → 3CO2 + 4H2O
What is 11.2 moles?
Consider the following reaction:
PCl3 + 3H2O -> H3PO3 + 3HCl
Calculate the mass of H2O needed to completely react with 20.0 g of PCl3.
What is 7.87 g of H2O?
The sum of the kinetic and potential energies of all the “particles” in the system
What is internal energy?
Calculate ΔH for the reaction:
SO2 + ½O2 → SO3 ΔH = ?
Given: (1) S + O2 → SO2 ΔH = –297 kJ
(2) 2S + 3O2 → 2SO3 ΔH = –792 kJ
What is -99 kJ?
The original energy form of a toaster.
What is electrical energy?
Moles of zinc oxide produced from 275 grams of oxygen in the following reaction:
Zn + O2 -> ZnO
What is 17.19 moles of ZnO?
How many grams of NH3 can be produced from the mixture of 3.00 g each of nitrogen and hydrogen (AKA the Haber process)?
N2 + 3H2 → 2NH3
What is 3.65 g of NH3?
The amount of joules in 1 calorie.
What is 4.184 joules?
Using Hess’s law, calculate the enthalpy of the reaction producing methanol (CH3OH) from carbon monoxide and hydrogen gas.
2CO(g) + 4H2(g) → 2CH3OH(g), ΔH = ?
1) 2CO(g) + O2(g) → 2CO2(g), ΔH = -566 kJ
2) 2H2(g) + O2(g) → 2H2O(g), ΔH = -571 kJ
3) 2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(g), ΔH = −1430 kJ
What is -278 kJ?
The movement of energy through substances in longitudinal waves.
What is sound energy?