Do You Remember
Chem R???
Chem R???
Common Ions
Chemical Foundations
Atoms, Molecules, & Ions
Stoichiometry
100
What are the diatomic elements?
H, O, F, Br, I, N, Cl
100
CH3COO- or C2H3O2-
Acetate
100
How many moles are in 15 grams in NaBr?
0.15 moles
100
Electrons in ionic compounds are ______ and electrons in covalent compounds are ______.
Transferred; shared
100
What is a mole?
6.02 * 1023 (representative) particles of ANYTHING
200
Avagadro's Number
6.02 * 1023
200
Iron (III) Oxide
Fe2O3
200
What are the units for STP?
273 Kelvin or 0 Celsius
1 atm
200
Which major group is the least reactive?
Group 8A (noble gases)
200
What is the mole ratio?
the ratio of moles of one substance to moles of another substance in a balanced equation.
300
What is the formula for Percent Yeild?
Percent Yeild = (Actual/Theoretical) * 100
300
MnO4-
Permanganate
300
Is steel a homogenous or heterogenous mixture?
homogeneous (it's uniform throughout)
300
Name the covalent compound: PCl5
phosphorus pentachloride
300
How do you calculate mass percent?
(mass of particular element / molar mass of compound) * 100%
400
What is the electron configuration for Calcium?
1s2 2s2 2p6 3s2 3p6 4s2
400
Oxalate
C2O42-
400
What is the difference between accuracy and precision?
accuracy: agreement of a value with the TRUE value (measures what it's supposed to measure)
precision: agreement of values with one another (the values measured are close to one another in magnitude)
400
define oxyanion
an ion with one or more oxygen atoms bonded to another element.
400
What is the molecular formula of a molecule?
the EXACT formula of a molecule, giving the types of atoms and the number of each type.
500
Molecules are the units for covalent compounds. What are the units for ionic compounds?
formula units
500
Hg2Cl2
Mercury (I) Chloride
500
Method of Separation:
the general name separating mixtures by using a system with a mobile phase and a stationary phase.
Chromatography (paper chromatography is shown)
500
Name the Theory:
1. each element is made up of tiny particles (atoms).
2. atoms of the same element are identical; atoms of different elements are different in some substantial way.
3. chem compounds are formed when atoms of different elements combine w/ each other. a given compound always has the same relative numbers and types of atoms.
4. chem rxns involve reorganization of the atoms; changes in the ways they are bound together. Atoms themselves are NOT changed in a chem rxn.
Dalton's Atomic Theory
500
What is the empirical formula of a compound?
the SIMPLEST whole-number ratio of atoms in a compound.