Quantities in chemical reactions - Chem unit 3
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/22
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai |
|---|
No analytics yet
Send a link to your students to track their progress
23 Terms
What is Quantitative Analysis
the process of identifying a substance using through numerical values
What is Qualitative Analysis
the process of identifying a substance using through our five senses strictly no numbers
What is a mol
a unit of measurement that measures an entity to 6.022×10²³
What is avogadro’s constant
the amount of entities in 1 mol (6.022×10²³)
Why do chemist use mols
Mols are used because most entities cannot be seen by the human eye and need specific tools to be properly counted which are rlly expensive
N =
#of particles
Why do we use 6.022 × 10²³
because its the perfect bridge and can turn any atomic mass into grams when multiplied
Molar mass + units
the mass in grams of one mol in a substance (g/mol)
the sum of all the elements mass per mol
why do chemist use percentage composition
to figure our exactly how much of each element is in a compound
Percentage composition + how we find it
the amount by mass of each element in a compound
Percent of element = Mass of element/mass of sample x 100
law of definite proportions
Percentage composition will always remain the same no matter if the compound is large or small
Molecular formula
tells you exactly how many atoms are in the compound
Empircial formula
reduces the amount of atoms by a common factor
Are most chemical formulas for ionic compounds empirical formulas.
Yes
The empirical formula can be determined from percentage composition data, using molar mass to find the relative amount of each element in the compound.
True
mole ratio
describe the ratio of reactants required to react.
stoichiometry
the study of the mass and amount relationships between reactants and products in a chemical reaction
Coefficients
the whole number infront of chemical formulas in blanced equations
Limiting reagent
the REACTANT that is completely consummed first in a chemical reaction
Excess reagent
the reactant that is left over once a chemical reaction has occured bec there wasnt enough limiting reageant
Theoretical yield
The max amount of product that can be gained from a given amount of reactants using stochimetry math
Actual yield
the measured amount or product that is actually obtained from doing a real life experiment
Percentage yeild
a calculation that compares the actual yeild to the theretical yeild to measure the effiency of a reaction