Download Draw the dot structure of the molecule and then redraw by replacing

Unit 4 Test Review Sheet – Molecules & Reactions
Name_______________
Date___________B____
Skills that will be tested: Handouts #1-9
 Drawing dot structures and re-drawing molecules with bonds
o Valence e-, octet rule, single/double/triple bonds
 Identifying the geometries and angles for molecules
o Linear 180º, Trigonal Planar 120º, Tetrahedral ≈109.5º, Trigonal Pyramid ≈107º, Bent ≈105º
 Describing the difference between a physical vs. chemical changes
o Bonds (ionic, covalent, metallic) broken and re-made, original vs. new matter, reversible vs. irreversible
 Predicting the products of a chemical reaction and identifying the type of reaction
o Synthesis, Decomposition, Single Replacement, Double Replacement, Combustion
 Balancing chemical equations and determining states of matter subscripts
o Same # of atoms on both sides using multiplying coefficients in front of formulas, (s) (l) (g) (aq)
 Converting between grams  moles
o Drop units, molar masses come from the sum of masses on the periodic table
 Using stoichiometry to determine the mass of a substance required or produced in a reaction
o Follow this calculation path gmol  molmol  molg, middle conversion #s from Bal. Eq.
Draw the dot structure of the molecule, then redraw by replacing shared pairs of e- with bonds.
Also, identify the molecular geometry and bond angles of the molecule.
Name and
Formula
e- dot structure
Redraw with bonds
Identify the molecular
geometries and bond angles
CH3CN
OF2
NBr3
C1 :
C2 :
C3 :
O1 :
N1:
Unit 4 Test Review Sheet – Molecules & Reactions
Name_______________
Date___________B____
Methane CH4 burns in Oxygen O2 to make Carbon Dioxide CO2 and Water H2O.
Is this a physical or a chemical change? Defend your answer by analyzing the reactants vs. products.
REACTANTS
PRODUCTS
Determine the correct formula of any missing products.
Balance the chemical equation using coefficients.
Complete the reaction using states of matter subscripts.
___Ca (
)
+ ___HF (
___MgCl2 (
___O2 (
)
___Cr (
)
)
)
+ ___O2 (
)
( )
+ ___ _ _ _ _ _ _
+ ___NaOH ( )___ _ _ _ _ _ _ (
+ ___NaCl (
___C5H10 (
 ___ _ _ _ _ _ _
)
+ ___O2 (
)
___NaClO3 (
 ___Cr2O3 (
)
 ___CO2 (
)
Name the type
of reaction.
( )
+ ___ _ _ _ _ _ _ (
)
)
)
)
+ ___H2O (
Convert 0.444 mol of Ca(OH)2 into g of Ca(OH)2
)
Convert 83 g of NH4Cl into mol of NH4Cl
Use the following balanced equation: 4Al + 3O2  2Al2O3
How many grams of Al2O3 will you make if you start with 125 g of Al? [Answer = _______________ ]