Science 10 – Modified
Chemistry Pre Test 2014
Name:_________________
1.
What is an anion and list a few elements that would become anions?
2.
What is an cation and list a few elements that would become cation?
3. ____ How many valence electrons does oxygen have?
A) 1
B) 2
C) 6
D) 4
4. ____ How many valence electrons does magnesium have?
B) 1
B) 2
C) 6
D) 5
5. ____ Elements which gain electrons are called :
A) valence electrons
B) cations
C) anions
D) isotopes
C) anions
D) isotopes
6. ____ Elements which lose electrons are called :
A) valence electrons
B) cations
7. _____ What is an ionic compound and what bond does it have?
8. _____ What is an molecular compound and what bond does it have?
9.
_____ Which of the following compounds is ionic?
A) CO2
B) MgF
C) P2O5
D) S2Cl2
10. _____ Which of the following compounds is molecular?
A) NaCl
B) MgO
C) RbF
D) S2Cl2
11. What is atomic mass?
12. _____ Flurorine has 9 protons, 9 electrons and 10 neutrons. What is its atomic mass?
A) 19
B) 9
C) 18
D) 22
13. When drawing Bohr model how to you know how many shells to draw?
14. _____ When drawing a Bohr model, Aluminium would have _____ electron shells drawn:
A)
4
B)
1
C) 3
D) 5
15. What is a chemical change?
16. What is a physical change?
17. What type of bond will occur between two non-metals?
18. What type of bond will occur between a metal and a nonmetal?
1. Fill in the elements in the table below.
Atomic #
Atomic Mass
# of protons
# of
neutrons
# of
electrons
Symbol
10
19
F
12
Mg
# of
electrons
Symbol
15
2.
Fill in the ions in the table below. ***
Atomic #
Atomic Mass
# of protons
# of
neutrons
Na+1
5
2
38
S-2
3.
Name the following compounds (use prefixes for molecular compounds)
***Molecular compounds are two non-metals and ionic compounds are a metal and
nonmetal****
a) Li3P
_____________________________
b) MgO
_____________________________
c) K2O
_____________________________
d) P2O5
_____________________________
e) SrCl2
_____________________________
f) KS2
_____________________________
g) N2O4
_____________________________
h) CO
_____________________________
i) Ca3N2
_____________________________
j) BrO3
_____________________________
4. Write the formulae for these Ionic compounds (use charges to get formulas)
a.
Boron sulfide
b.
Sodium phosphide
e.
strontium Chloride
f.
aluminum oxide
c.
potassium selenide
5. Write the formulae for these Molecular compounds.
a. Carbon dioxide
b. dicarbon trisulfide
_________
c. pentaphosphorus
tetrafluoride
d. dinitrogen monoxide
_________
e. Aluminum trifluoride
_________
6. Draw a Lewis dot diagram to represent the bonding that occurs in each compound.
Indicate if it is ionic or molecular and state its chemical formula. Remember: use arrows
and ions for ionic compounds and use loops and sticks for molecular.
one Phosphorous and three fluorine
Ionic or molecular?
__________
Chemical formula? __________
Calcium and Chlorine
Ionic or molecular? __________
Chemical formula? __________
7. How many atoms in each of the following compounds?
Mg2CO3
HBr
HClO2