# Chem exam 1 review

version from 2017-10-18 21:31

## Chap 3

How to find average atomic mass of an elementf1M1 + f2M2 +… + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope.
What is Avogadro's number and what does it represent6.0221367x10^23 and it represents a mole
How many grams of Li is one mole of Li atoms6.941 (same as atomic mass)
for any element, what is molar mass also equal toatomic mass (amu)
what are the units for molar massgrams
how to go from grams to amumultiply by 6.022x10^23
how to go from amu to gramsmultiply by 1.66x10^-24
how to calculate number of atoms of an elementnumber of moles multiplied by avogadro's number
how to calculate number of moles of an elementmass of element divided by molar mass in g/mol
what is molar mass also known asmolecular weight
unit for molar massg/mol
how to find molar mass of a compoundfind atomic mass of each element and then multiply that by each element's subscript and then add the results together
when are zeros significantafter a number on the right of the decimal or between numbers
when multiplying exponents how do u decide how many significant digits to put in the answerlook at how many significant digits the factor with with exponent and also the most significant digit has
what is ummicrometeres
go over hw assignmentsok
what is formula for density(p)mass/volume
how many in to cmx 2.54
mi to kmx 1.61
hr to sec3600
km to midivide by 1.61
m to ftx 3.28
cubic m to lx 1000
cubic meters to cubic inchx 61023.7
l to cubic inchx 61.0237
cubic m to lx 1000
gal to lx 3.78541
name for LiHLithium hydride
name for AlI3Aluminum Iodide
Names of Common Ions (General Chemistry)

## chap 1

how many elements, how many natural, how many man made118, 82, 36
extensive propertiesas opposed to intensive properties depend on how much material is there
example of microscopic measurementmole
SI unit for temperatureKelvin
celsius to kelvinPLUS 273.15
celsius to fahrenheitx1.8 then plus 32
fahrenheit to celcsusminus 32 then divide by 1.8
pico10^-12
tera10^12
(for si exponents for tera giga mega kilo deci centi milli micro nano pico) it go(by 3's): 12 9 6 3 now negative 1 2 3 6 9 12
weight equals what on earth and what on the moonmass on earth, mass times .1 on moon
SI unit for volumecubic metre
cubic metres to litresx 1000
how many milliliters is one cubic centimeter1
SI unit for volumekg/m^3
how many atoms are in 12 grams of carbon6.022x10^23
amu to moleatoms/6.022x10^23

## chap 2

atomic theory by who of when is whatby Democritus 5th century to Dalton 1808 is belief everything is made up of atoms
who's theory is law of definite proportions supported by and what is itits in dalton of 1808's atomic theory it says elements' proportions of atoms are either integers or simple fractions
laws that support dalton's atomic theory of 1808law of conservation of mass ( in chemical reactions), law of definite proportions ( of a compounds), law of multiple proportions (between compounds)
amu to gx 1.66x10^-24
how to calculate molecular weight nd what is unitfor each element in the compound find the atomic mass and multiply that by how many of that element there is in the compound then add the result with that of the other elements in the compund and thats the molecular weight in g/mol
how to go from g to molg/molecular weight
explain law of multiple proportionswhen two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers

## chap 4

define a solutiona homogenous mixture of two or more substances
what is an aqueous solutiona solution in which the solvent is water and the solute is initially liquid or solid
difference between electrolyte and nonelectrolyteelectrolyte when dissolves in water makes a solution that can conduct electricity
difference between strong and weak electrolytestrong electrolyte dissociates 100% but a weak electrolyte does not completely dissociate
what is Ionizationlosing or gaining electrons to become positively or negatively charged thus forming an ion
hydration definitionthe process in which an ion is surrounded by water molecules arranged in a specific manner.
What property of water enables its molecules to interact with ions in solutionwater is a polarized compound and can hydrate both positive and negative ions
a reaction that is an example of metathesis reaction precipitate reaction
another name for metathesis reactiondouble displacement reaction
what is precipitate reactionresults in formation of an insoluble compound aka precipitate
what does metathesis reaction involvethe exchange of parts between two compounds
what property of a solution determines whether a precipitate formssolubility
what is solubilitythe maximum amount of a solute that will dissolve at a certain temp
look atslide 16 of chap 4, memorize insoluble and exceptions
formula for ammoniumNH4+
ions that do not change in a reactionspectator ions
ionic equation vs molecular equationionic shows ions for each, molecular shows molecule version of the equation
net ionic equationdoes not show spectator ions
steps to write net ionic equationsbalance equation, identify precipitates, shows dissociation, cancel spectator ions, balance charges w/ ions
what do acids produce after reacting w/ certain metalshydrogen gas
what is produced when acids react w/ carbonates and bicarbonatescarbon dioxide gas'
what type of acid and base solutions conduct electricityaqueous
how do bases feelslippery
what type of acids and bases are proton donors and acceptors respectivelybronsted
what is a neutralization reaction and what does it produceit is a reaction between acid and base and produces water and salt
what is oxidation reduction reactionelectron transfer reaction
what is the oxidation number of free elements in an uncombined statezero
what is the oxidation number of a monatomic ionthe same as the charge
O usually has an oxidation number of -2 but what is the oxidation number for O2-1