Semester Exam Topics ChapterTopics 1 Density, Metric System, Conversions know kilograms, milliliters, density = mass/volume 2 Chemical vs. Physical changes, eg : rusting, distillation, decomposition, synthesis, dissolving…
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Write the atomic symbol for nitrogen-14& nitrogen-15
147N has 7 neutrons & 157N has 8 neutrons
Write the electron configuration for each:
Calculate the density of a 4cm cube with a mass of 800g:
Volume = 4cm x 4cm x 4cm = 64cm3
Density = mass/volume = 200g/64cm3
= 12.5 g/cm3 so it will not float!
Hint: memorize this chart!
Number of Orbitals
# of electrons possible
3s,3px,y,z , 3d (5)
4s,4px,y,z,,4d (5), 4f (7)
Discovered the periodicity of the elements. He left holes in the table and predicted properties of missing elements.
What happens to electrons?
One atom loses electrons, one gains
Two atoms share a pair of electrons evenly
Two atoms share a pair of electrons unevenly
Three types of Bonds
Polar Covalent Bond
Metal + non metal
Examples: NaCl, CaCO3
Diatomic element, hydrocarbon
Examples: N2, CH4, Diamonds
Two different nonmetals
Examples: H2O, NH3
Lattice structure, solids salts
Gases, or network solids, non polar
Liquids that hold together by polar ends.
Write the Formula
Iron (III) sulfate
Mercury (II) bromide
Name the compound
Iron III oxide
INNER TRANSITION METALS
tend to be radioactive
Memorize the names of the families and their properties !
Going across the periods
Going down the groups
Write a Balanced reaction:
How many grams of aluminum are needed to react with 200g of CuCl2 ?
How many grams of copper is formed form 100g Al + 200 g CuCl2?
If the yield is 95%, what is the actual copper formed?
How many liters of carbon dioxide will be formed in the combustion of 5kg of butane, C4H10?