C3- Quantitive Chemistry Flashcards
(25 cards)
What is quantitative chemistry?
The branch of chemistry that deals with the measurement of quantities and the analysis of relationships between substances.
True or False: The mole is a fundamental unit in quantitative chemistry.
True
What is Avogadro’s number?
6.022 x 10^23 particles per mole.
Fill in the blank: The mass of one mole of a substance in grams is numerically equal to its __________.
molar mass
Which law states that the mass of the reactants must equal the mass of the products?
Law of Conservation of Mass
What is the formula to calculate moles from mass?
Moles = Mass (g) / Molar Mass (g/mol)
True or False: The empirical formula represents the actual number of atoms in a molecule.
False
What does the term ‘stoichiometry’ refer to?
The calculation of reactants and products in chemical reactions.
Calculate the number of moles in 50 grams of water (H2O). (Molar mass of H2O = 18 g/mol)
2.78 moles
What is a limiting reactant?
The reactant that is completely consumed in a chemical reaction, limiting the amount of product formed.
Fill in the blank: The __________ law relates the volume of gases to the number of moles at constant temperature and pressure.
Ideal Gas
What is the molarity (M) of a solution containing 2 moles of solute in 1 liter of solution?
2 M
True or False: Concentration is defined as the amount of solute per unit volume of solution.
True
What is the formula for calculating the concentration of a solution?
Concentration (C) = Amount of solute (n) / Volume of solution (V)
What does percent composition refer to?
The percentage by mass of each element in a compound.
How many grams are in 3 moles of sodium chloride (NaCl)? (Molar mass of NaCl = 58.5 g/mol)
175.5 grams
What is the significance of the coefficients in a balanced chemical equation?
They indicate the relative amounts of reactants and products involved in the reaction.
Fill in the blank: The __________ principle states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each gas.
Dalton’s
What is the formula for calculating the number of particles in a given number of moles?
Number of particles = Moles x Avogadro’s number
True or False: The molar volume of an ideal gas at standard temperature and pressure (STP) is 22.4 liters.
True
What does the term ‘theoretical yield’ refer to?
The maximum amount of product that can be produced from a given amount of reactants.
What is the difference between theoretical yield and actual yield?
Theoretical yield is the calculated maximum product, while actual yield is the measured amount produced in an experiment.
Calculate the molar mass of carbon dioxide (CO2).
44 g/mol
What does it mean if a reaction is exothermic?
It releases energy in the form of heat.
