SNC 2D0 Exam Review Science

Topics: Cell, Oxygen, Ion Pages: 11 (3826 words) Published: October 24, 2014

SNC 2DO EXAM REVIEW January 2014
The exam is based on the entire semesters work.
Chemistry
1. Label the following on a periodic table:
a) Alkali metals b) Alkaline earth metals c) Halogens d) Noble gases 2. Indicate the metals, non-metals and metalloids.
-38100431803. Show the trends for reactivity and atomic radius.

4. Which of the following elements has the largest atomic radius? Why? a) fluorine b) oxygen c) nitrogen d) calcium
Calcium has the largest atomic radius as it has 3 rings of electrons, while the rest of the listed elements have 1. 5. Which of the following elements has the largest atomic radius? Why? a) Be b) C c) N d) O

All 4 elements have the same atomic radius as all 4 elements have only 1 shell. 6. Arrange the following in order of increasing reactivity: Sc, Nb, Li, Ca, Na, Os. Explain your choices.
Os, Nb, Sc, Ca, Li, Na.
In metals, reactivity decreases as you go from left to right across a period and increases as you go down a group. 7. Using the periodic table, identify an element which has seven valence electrons. All of the Halogens have seven valence electrons.

Example- fluorine, chlorine.
8. Which of the following has the smallest atomic radius?
a) S b) Se c) O d) Te
oxygen has the smallest atomic radius as it has only one shell. 9. What is an ion?
An ion is an atom that has become stable by gaining or losing electrons. 10. A positive ion is called cation and a negative ion is called anion. 11. Ionic bonds form between a metal and a non metal.

12. Covalent bonds form between two non-metals.
13. What is a polyatomic ion? How do you recognize a polyatomic ion in the NAME of a compound? A polyatomic ion is a group of atoms which act as a single ion. All polyatomic ions (except ammonium and hydroxide) have the suffix –ate. 14. The roman numeral in the name of a compound indicates the charge on multivalent elements. 15. For the following compounds:

i) identify if they are ionic or molecular compounds
ii) give the correct formula for the compound
a) sulfur dioxide
i) molecular ii) SO2
b) carbon tetrachloride
i) molecular ii) CCl4
c) dinitrogen trioxide
i) molecular ii) N2O3
d) sodium sulfide
i) ionic ii) Na2S
e) boron trifluoridei) molecular ii) BFl3
f) potassium oxide
i) ionic ii) K2O
g) lead (II) fluoride
i) ionic ii) PbF2
h) iron (II) sulfate
i) ionic ii) FeSO4
I) sodium sulfate
i) ionic ii) Na2SO4
j) aluminum phosphate
i) ionic ii) AlPO4
k) sodium hydroxide
i) ionic ii) NaOH
l) lithium iodide
i) ionic ii) LiIm) barium nitrate
ii) ionic ii)Ba(NO3)2
n) aluminum carbonate
i) ionic ii) Al2(CO3)3
o) oxygen difluoride
i) molecular ii)OF2
p) carbon monoxide
i) molecular ii) CO
q) diphosphorus pentasulfidei) molecular ii) P2S5
r) dihydrogen monoxide
i) molecular ii)H20
s) silicon dioxide
i) molecular ii)SO
t) sulfur dichloride
i) molecular ii)SCl
16. For the following compounds:
i) identify whether they are ionic or molecular compounds
ii) give the correct name of the compound
a) K3PO4
i) ionic ii) Potassium Phosphate
b) SnO2
i) ionic ii) tin (IV) oxide
c) Ba(OH)2
i) ionic ii)barium hydroxide
d) CuCl2
i) ionic ii) copper (II) chloride
e) NaCl
i) ionic ii) sodium chloride
f) CS2
i) molecular ii) carbon disulfide
g) BF3
i) ionic ii) boron fluoride
h) SO3
i) molecular ii) sulfur trioxide
I) NH3
i) molecular ii) nitrogen hydroxide
j) H2S
i) molecular ii) dihydrogen monosulfidek) Al(NO3)3
i) ionic ii) aluminum nitrate
l) Li2O
i) ionic ii) lithium oxide
m) Ca3N2
i) ionic ii) calcium nitride
n) MgS
i) ionic ii) magnesium sulfide
o) CaSO4
i) ionic ii) calcium sulfate p) BaCl2
i) ionic ii) barium chloride
q) H2O
i) molecular ii) dihydrogen monoxide
r) CH4
i) molecular ii) carbon tetrahydride
s) NO2
i) molecular ii) nitrogen dioxide
t) CO
i) molecular ii) carbon monoxide
17. i) Balance the following skeletal equations....
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