8th Grade Midterm Review practice:
Element/ mixture/ compound:
Correctly complete the chart below: In the second column state whether the material is a
mixture or pure substance. In the third column state whether the material is homogenous,
heterogenous, an element or a compound.
Material
Mixture/ pure substance
Homogenous, heterogenous,
element, compound
Aluminum foil
Pizza
Copper
Coffee
Italian Dressing
Toothpaste (Na2HPO4)
Periodic Table:
Correctly complete the chart below. Make sure you are paying attention to charges!
Element
Name
Element
Symbol
# of
protons
# of
neutrons
# of
electrons
Titanium
Charge
Neutral
Sn
54
55
+1
Element
Name
Element
Symbol
# of
protons
# of
neutrons
Mercury
# of
electrons
Charge
80
26
28
Iodine
-1
Bismuth
Bi
Ionic and Covalent Bonds:
State whether the following compounds will form an ionic bond or a covalent bond. If it forms
an ionic bond then correctly name the compound. Make sure to use your ion chart! :
Chemical Formula
AlAs
Type of Bond
Se2
BeCl2
H4Si
C2H4O2
(NH4)2CO3
Write the chemical formula for the ionic compounds listed below:
Calcium fluoride : _______________________________
Potassium nitride: ______________________________
If ionic – Name
Lithium oxide:______________________________
Sodium bicarbonate:__________________________
Magnesium sulfate: ___________________________
Drawing Compounds: Draw how the following compounds form. Start with each Lewis
structure for the elements in the compound. If the bond is ionic make sure to show the
movement of ALL the valence electrons, the resulting charges, the name of the compound
formed. If the bond is covalent make sure to show all the valence electrons and simplify the
bond formed with lines.
1. MgI2
3. Ca3P2
2. Br2O
4. C2H4Cl2