C4 Chemical Calculations Flashcards
What is the Avogadro constant?
The number of atoms, molecules, or ions in a mole of any substance (i.e., 6.02 * 10^-23 per mol)
What is a burette?
A long glass tube with a tap at one end and markings to show volumes of liquid; used to add precisely known volumes of liquids to a solution in a conical flask below it.
What is concentration?
The amount of a substance dissolved in a given volume of liquid.
What does concordant mean in titration?
When you have two titration results that are within 0.1 cm³ of each other.
What is the end point in a titration?
The point in a titration where the reaction is complete and titration should stop.
What is a limiting reactant?
The reactant in a chemical reaction that when used up causes the reaction to stop.
What is a mole?
The amount of substance in the relative atomic or formula mass of a substance in grams.
What is percentage yield?
The actual mass of product collected in a reaction divided by the maximum mass that could have been formed in theory, multiplied by 100.
What is a pipette?
A glass tube used to measure accurate volumes of liquids.
What is relative atomic mass (Ar)?
The average mass of the atoms of an element compared with carbon-12 (which is given a mass of exactly 12).
What is relative formula mass (Mr)?
The total of the relative atomic masses, added up in the ratio shown in the chemical formula, of a substance.
What is titration?
A method for measuring the volumes of two solutions that react together.
What is yield?
The mass of product that a chemical reaction produces.
