Chemical formulas
define an ion
atoms with a net charge
Name CO2, what type of compound is it? how can you tell?
Carbon dioxide, it's a molecular compound because both atoms are non-metals
define matter
matter: anything that has mass and occupies space
Identify the three components of an atom
protons (+), Neutrons, electrons (-)
who is credited with the atomic molecular theory?
John Dalton
identify the quantities of each element in:
Mg(NO3)2
Mg: 1
N: 2
O: 6
name NaCl, what type of compound is it? how can you tell?
Sodium chloride, It is an ionic compound because one atom is a non-metal and the other is a metal
What is the smallest unit of matter?
The atom
What two subatomic particles have charges, what is the magnitude of their charge?
Protons: +1
Electrons: -1
Which scientist discovered that
1) cathode rays go in a straight line but curve in the presence of a magnet
2) Anything can be used as an electrode
3) the electrode is negatively charged
J.J Thomson
What is an oxyanion?
Oxygen acts as the anion
Name Fe2O3, What type of compound is it? how can you tell?
Iron (III) oxide, because it is non-metals and metals
how are physical properties expressed vs chemical properties?
physical properties are expressed without changing composition, chemical properties express a change in composition
SUPRISE QUESTION!
What is the date of the final exam?
Tuesday 5/12 at 01:30 PM
Who discovered that atoms are mainly empty space? name the experiment.
Ernest Rutherford and the gold foil experiment
What are the 5 polyatomic ions, Jeff asked us to memorize? name and chemical formula
NH4+ ammonium
SO22- sulfate
NO3- nitrate
CO32- carbonate
PO43- phosphate
Name SO42- and H2SO4, what type of compounds are they, how can you tell?
SO4 is Sulfate it is a molecular compound; it is a known polyatomic ion. the other is Sulfuric acid, it is also a molecular compound.
What is a pure substance vs a mixture?
Pure substance: fixed composition
mixture: variable composition
What can be understood given the atomic number of an element
-Type of element
-Number of protons
who is credited for the first version of the periodic table. where elements were in lists by mass and properties.
Dimitri Mendeleev
What is the ratio for any carbohydrate?
Cx(H2O)x
Name Na2SO4 * 10 H2O
what would it be called without 10 H2O
Sodium sulfate decahydrate
without water: Sodium sulfate anhydrous
explain what a homogenous mixture is vs a heterogenous mixture
Homogenous: Uniform composition throughout (i.e. sea water)
Heterogenous: Non-uniform composition (i.e. chocolate chip cookie)
If O has an atomic mass of 16 and an atomic number of 8, how many neutrons are present in the nucleus?
Who discovered that the number of protons determines the type of element. hint* died in WW2
Henery Mosely