a.
OF2______oxygen difluoride___________
b.
KBr____potassium
bromide_____________
c.
Ca3P2_____calcium phosphide____________
d.
BeCO3____beryllium carbonate__________
e. MgSO4____magnesium sulfate_____________
f. CuS______copper(II) sulfide___________
g.
OsO4______osmium(VIII)
oxide___________(use algebra to figure out Os’ charge. Remember oxide is-2
and the sum of all charges in compound is ZERO)
h.
NH4I___ammonium iodide______________
i.
CF4______carbon tetrafluoride___________
j. Fe(HCO3)2____iron(II) hydrogen
carbonate_____________
a.
sodium hydride NaH
b.
magnesium nitrate Mg(NO3)2
Why? Mg+2
needs two NO3- to create a total charge
of ZERO
c.
copper (II) hydroxide Cu(OH)2
d.
calcium carbonate CaCO3
e.
platinum (IV) chloride PtCl4
f.
ammonium chlorate NH4ClO3
g.
diphosphorus pentaselenide P2Se5
h.
iridium (III) sulfide Ir2S3
6.
Match the following descriptions with the correct polyatomic ion.
(It has to be one of the eight in your notes.
Include charge!)
a.
Found in guano and other natural fertilizer, it is
needed by plants for the production of amino acids (hint: these contain
nitrogen). ______nitrate___________
b.
It'll either knock you out
or wake you up with its ammonia-like smell____ammonium_______
c.
Bakers use this to generate carbon dioxide to help puff up their
goodies____hydrogen
carbonate_______
d.
Get this Cl-containing stuff on your jeans and they'll fade in a
hurry!_____chlorate____
7. Balance the following:
a. 2 Al(s) + Fe2O3(s) à Al2O3(s) + 2
Fe(l)
b. 4 K + O2 à 2 K2O
c. C3H8 + 5 O2 à 3 CO2 + 4 H2O
d. 3 Ca(NO3)2 + 2 Na3PO4 à Ca3(PO4)2 + 6 NaNO3
e. CuS + 2 NaOH à Cu(OH)2 + Na2S
8. Given: N2(g)
+ 3 H2(g) à2 NH3(g)
a.
What does the little (g) indicate?____gas__________
b.
What is the minimum number of H2 molecules needed to react
with 10 molecules of N2?____3(10) = 30_________
c.
If 34 grams of ammonia were produced from 6 grams of hydrogen, how much
nitrogen reacted?____28 g_______
d.
What else is conserved along with mass in any chemical reaction?_____number of atoms_____________
9. Translate into a chemical equation:
Two parts of dihydrogen
monoxide liquid decompose to produce gaseous hydrogen and oxygen in a ratio of
2:1.
2 H2O(l) à 2 H2(g)
+ 1 O 2(g)
10. Translate the following into English:
a. 2Al(s) + Fe2O3(s) à Al2O3(s) + 2
Fe(l)
2
moles of solid aluminum react with 1 mole of iron(III) oxide to produce 1 mole
of solid aluminum oxide and 2 moles of liquid iron
b. 2NaCl(aq) + H2SO4(aq) à Na2SO4(aq)
+ 2HCl
2
moles of aqueous sodium chloride react with 1 mole of aqueous hydrogen sulfate(commonly known as
sulfuric acid) to produce 1 mole of sodium sulfate and 2 moles of hydrogen
chloride, which escapes a s a gas
11. For each element in the following count the number of atoms on
each side of the equation:
Fe2(SO4)3 + 12 KSCN
à 2
K3Fe(SCN)6 + 3 K2SO4
|
atom
|
Left hand side total
|
Total atoms on right hand side
|
|
Fe
|
2
|
2(1)= 2
|
|
S
|
3(1) +12 = 15
|
2(6)(1) + 3(1) = 15
|
|
O
|
12
|
12
|
|
K
|
12
|
2(3) + 3(2) = 12
|
|
C
|
12
|
2(6) = 12
|
|
N
|
12
|
2(6) = 12
|
12. a. true; electronegativity does increase across a period; effective
nuclear charge increases
b.
false; what’s true: ionization energy in fact increases across a
period ;effective nuclear charge increases
c. false;
true: the radius decreases across the period. Same number of
shells but more protons have squeezing effect.
d.
false; true: boiling points and melting points steadily decrease
13. Which of
the following can possibly be the shell diagrams of alkaline earth metals?
a. 2e) b. 2e)1e
c. 2e)8e)2e d. 2e)8e)18e)8e)2e
Answer ________C_____and D________
(2
marks; all or nothing)
14. Explain why H loves to react with
another H to form H2. Use dot and shell diagrams in
your explanation.
H .. H Each hydrogen fills its shell
by sharing.
15. Which
of the following is a characteristic common to both the Thompson and the Rutherford models of the atom? Choose one letter only (1
mark)
|
A)
|
The atom is made up of positive and negative
charges.
|
|
B)
|
The negative charges are evenly distributed
throughout the atom.
|
|
C)
|
Electrons revolve around the nucleus.
|
|
D)
|
The nucleus of atoms is made up of protons
and neutrons.
|
Answer A
16. Complete
the following sentence with a single word. (1
mark)
The mass number, A, of an atom corresponds to
the number of particles contained in the atom's nucleus : that is the total
number of protons and ________....
Neutrons
17. An atom is composed of 23 protons, 23
electrons and 28 neutrons. Give another
isotope for this atom.( 2 marks)
This
is 51V. Another isotope would be 52V.
