Week 1 Gen/Org Chem Flashcards
How many significant figures? 222 ? 0.0123 ? 0.2050 ?
222= 3 0.0123=3 ( leading 0 are not significant) 0.2050=4 (Trailing 0 in a # w/ a decimal are significant)
0.0000000005 Scientific Notation
5 x 10-10
42 Celsius = what in Farhenheit?
F= 9/5 (42) +32 or F= 1.8 (42) +32 Answer : 107.6
96 Farhenheit = What in Celsius?
C= 0.556 x (F-32) or C=5/9 (F-32) Answer: 35.58
Absolute zero is ?
-273.15 celcius or 0 Kelvin
Hetero/Homo Pure/Mixture A glass of water with ice cubes in it?
Hetero pure
Hetero/Homo Pure/Mixture Chicken noodle soup
Hetero mixture
Homemade sweetened ice tea with sugar?
Homo Mixture (single phase liquid, but has sugar in it)
Vodka only in a glass
Homo Pure
A pure substance containing only 1 atom
Element
The smallest unit of an element
Atom
On the periodic table the element carbon C has 2 numbers associated with it what are they?
Atomic Mass and Atomic number
The atomic number represents what?
The number of protons
The atomic mass represents?
The number of protons and neutrons together
An atom with the same number of protons but having more number of neutrons is called a ?
Isotope
The strongest chemical bond is ?
Covalent
Covalent bonds are a _______ of electrons?
Sharing of a pair
All atoms except _____ and _____ fill the outer layer of electrons with an octet
Hydrogen and Helium
NaCl has what type of bond?
Ionic Bond
_______ _________ result form the transfer of electrons from one atom to another leaving atoms with + and - charges to attract one another
Ionic Bond
Non-covalent bonds consist of:
Ionic bonds Hydrogen Bonds Hydrophobic bonds London dispersion forces Keesom forces
Hydrogen bonds?
A weak electrostatic interaction between a hydrogen atom and 2 electronegative atoms
London dispersion forces
Very weak interactions occuring between electrically neutral molecules at close range
IA ( far left column) are in what family?
Alkaline Metals
Noble gasses are which family?
VIII far Right column
Physical properties of non-metals are observed at ?
Room temperature
What is Avagadro’s number?
6.022 x 1023
One mole of a substance is called a _______ and has units of _______
Molar Mass and has units of g/mol
How many moles are in 75 g of NaCl?
Na mass= 23, Cl mass=35 23+35=58 75/58 = 1.293 g/mole 1.293 moles in 75 g of NaCl
Polyatomic Ion ?
contains atoms covalently bonded but retain their identity within the compound
Ammonium
NH4+
Hydronium
H3O+
acetate
C2H3O2-
Hydrogen carbonate (bicarb)
HCO3-
Hydroxide
OH-
Nitrate
NO3-
carbonate
CO32-
Reduction
Neutral Cl2 + 2e- = 2Cl- When a reactant gains electrons and becomes more negative. (+) or a neutral to a (-) = Reduction