Chem 1001 Final LSU
For science to be science, what does it need to have? testable, reproducible, explanatory, predictive, tentative
scientific hypotheses testable explanations of observed data
scientific law summarize large amounts of scientific data and provide descriptions of natural
phenomena and can usually be stated mathematically
scientific models tangible items or pictures used to represent individual processes
variable a parameter that changes over the course of the experiment
precision how close the results are bunched up together
accuracy how close the results are to a true value
significant figures the number of figures in a reported measurement assumed to be exact
density mass per unit volume
what does density depend on? temperature in general
formula for density d=m/v
the law of conservation of mass matter is neiter created nor destroyed during a chemical reaction
the law of definite proportions a compound always contains the same elements in the same ratio
the law of multiple proportions elements might combine in more than one ratio, and each ratio represents a
different compound
, Chem 1001 Final LSU
john dalton and the atomic theory of matter -All matter is composed of extremely small particles called atoms
-All atoms of a given element are alike and differ from the atoms of any other
element.
-Compounds are formed when atoms of different elements combine in fixed
proportions
-a chemical reaction involves the rearrangement of atoms.
mole amount of substance that contains as many building blocks of that substance
avogadro's number 6.022x10^23
how many atoms are in one mol of substance? 6.022x10^23
molar mass mass in grams of 1 mole of a substance
what is molar mass equal to? atomic mass
what does 1 mol of a substance weigh? molar mass
atomic mass units (amu) average atomic weight of all of an element in the world
the atomic number is equal to... the number of protons
what did mendeleev's periodic table look like? atoms were placed in order based off of their properties in a two dimensional matrix
why did mendeleev leave gaps in the periodic table? he predicted that these elements were yet to be discovered
what was dalton able to determine using compositions of relative masses of the atoms
compounds?
what did dalton base his scale off of? H= 1amu
opposite charges attract
For science to be science, what does it need to have? testable, reproducible, explanatory, predictive, tentative
scientific hypotheses testable explanations of observed data
scientific law summarize large amounts of scientific data and provide descriptions of natural
phenomena and can usually be stated mathematically
scientific models tangible items or pictures used to represent individual processes
variable a parameter that changes over the course of the experiment
precision how close the results are bunched up together
accuracy how close the results are to a true value
significant figures the number of figures in a reported measurement assumed to be exact
density mass per unit volume
what does density depend on? temperature in general
formula for density d=m/v
the law of conservation of mass matter is neiter created nor destroyed during a chemical reaction
the law of definite proportions a compound always contains the same elements in the same ratio
the law of multiple proportions elements might combine in more than one ratio, and each ratio represents a
different compound
, Chem 1001 Final LSU
john dalton and the atomic theory of matter -All matter is composed of extremely small particles called atoms
-All atoms of a given element are alike and differ from the atoms of any other
element.
-Compounds are formed when atoms of different elements combine in fixed
proportions
-a chemical reaction involves the rearrangement of atoms.
mole amount of substance that contains as many building blocks of that substance
avogadro's number 6.022x10^23
how many atoms are in one mol of substance? 6.022x10^23
molar mass mass in grams of 1 mole of a substance
what is molar mass equal to? atomic mass
what does 1 mol of a substance weigh? molar mass
atomic mass units (amu) average atomic weight of all of an element in the world
the atomic number is equal to... the number of protons
what did mendeleev's periodic table look like? atoms were placed in order based off of their properties in a two dimensional matrix
why did mendeleev leave gaps in the periodic table? he predicted that these elements were yet to be discovered
what was dalton able to determine using compositions of relative masses of the atoms
compounds?
what did dalton base his scale off of? H= 1amu
opposite charges attract
