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ATOM AND EVE

MOLES AND STOICH

CHEMICALREACTIONS

SOLUTIONS AND SOLUBILITY ANYTHING

Draw the Bohr model for Sulfur (S)

1-1

2 electrons on inner shell, 8 electrons on middle, 6 electrons on outermost

shell

1. Put the following elements in order

from smallest atomic radius to largest: C,

F, N, O2. Put the following

elements in order from least

electronegativity to greatest

electronegativity

1-2

F, O, N, C

C, N, O, F

Which compound contains both ionic and

covalent bonds?CCl4

MgSO4

H2OCO2

1-3

MgSO4 contains both ionic and covalent bonds

1-4

Write out the alpha decay

of 207Pb

207Pb -> 203 Hg + 4He

82 80 2

1-5

A sample of element X contains 90% X-35

atoms, 8% X-37 atoms and the remainder is X-38 atoms. What is its

average atomic mass?

35.22

90% X-35: 0.90 x 35 = 31.58% X-37: 0.08 x 37 = 2.96

2% X-38: 0.02 x 38 = 0.76

2-1

How many molecules are there in 3.33L of gas at

STP?

8.9 x 1022

2-2

2 C2H2 + 5 O2 4 CO2 + 2 H2O

•Determine the molecules of water produced if 5.49

grams of C2H2 are reacted •What type of reaction is

this?

€

5.49 gC2H 2×1 mol C2H 2

26.04 gC2H 2

×2 mol H 2O

2 mol C2H 2

×6.02×1023 molecules H 2O

1 mol H 2O= 1.27×1023 molecules H 2O

Combustion

2-3

Aluminum reacts with fluorine gas to produce

aluminum fluoride. If 0.500 moles of fluorine gas react,

calculate the number of moles of aluminum fluoride that will be produced. (Hint:

write balanced chemical equation first!)

2 Al + 3 F2 2 AlF3

€

0.500 mol F2 ×2 mol AlF33 mol F2

= 0.333 mol AlF3

2-4

Lead (II) sulfide reacts with oxygen gas to produce lead (II)

oxide and sulfur dioxide. If 0.500 moles of O2 were

consumed using this chemical reaction, how many grams of

lead(II) oxide would be produced?

119.5 grams PbS

2-5

What is the density (in g/mL) of CO2 at STP?

.00196 g/mL

3-1

What are two differences in the physical properties

between ionic compounds and

molecular compounds? (think melting points,

ability to conduct electricity, etc.)

Molecular compounds are not able to conduct electricity and have low

melting points, ionic compounds conduct

electricity when molten or dissolved and have

high melting points

3-2

Which is a unique characteristic of the bonding between metal atoms? A.

atoms require additional electrons to reach a stable octet.

B. Atoms must give away electrons to reach a stable octet. C. Atoms share

valence electrons only with neighboring atoms to reach a stable octet. D.

delocalized electrons move among many atoms creating a sea of

electrons.

D. Delocalized electrons move among many

atoms creating a sea of electrons

3-3

Which best explains why cations are smaller than the atoms which they are

formed?a.The Metallic atom gains electrons, causing

a larger effective nuclear pull.b. The metallic atom loses electrons

resulting in the loss of an entire energy level.

c. The nonmetallic atom gains electrons, causing a larger effective nuclear pull.

D. The nonmetallic atom loses electrons, resulting the loss of an entire energy level.

b. The metallic atom loses electrons resulting

in the loss of an entire energy level.

3-4

How many grams of ice will melt at 0C if the ice

absorbs 420. kJ of energy?

1,257 g

3-5

a. Determine if the following double

replacement will occur. b. If so, predict the products and balance

the reactionCaCO3 + Al2(SO4) 3

a. Yesb. 3CaCO3 + Al2(SO4) 3

3CaSO4 + Al2(CO3) 3

4-1

A student performs an experiment to find the

solubility of a substance. The student finds the amount of substance

needed to make a saturated solution in 100 g

of water at different temperatures. The

student’s data are shown in the table below the

graph. What is the Formula of the

substance?

Trial Temperature (C) of Water

g of salt in

100 g H2O

1 79 40

2 90 50

KClO3

4-2

Assume that a solubility curve for a gas such as ammonia, at one atmosphere of pressure, was plotted on the solubility curve

graph. Reading from left to right, would this curve would _____

a.slope upward b. slope downward

c. go straight across

Slope downward

4-3

Identify the following compounds as an Acid or Base based on its

composition or given pH. 1) ___________ HF

2) _________________ MgOH3) ____ Diet Coke Soda (pH = 4)4) _______ Sour Candy (pH = 4)

5) ________________ HBr6) _________________ NaOH7) ___________Tylenol (pH = 9)

1) _______acid_____ HF2) _______base_____ MgOH3) __acid___ Diet Coke Soda

(pH = 4)4) ____acid___ Sour Candy (pH

= 4)5) ______acid_____ HBr6) ________base_____

NaOH7) ____base____ Tylenol (pH

= 9)

4-4

What is the pH of a solution of KOH with a

hydroxide concentration of [OH-] = 1 x 10-5M?

pH = 9

4-5

A .5 M solution of KOH occupies a volume of 5 mL. How many mL must

be added to dilute the solution to .3 M?

3.33 mL

5-1

What is the percent composition of bromine in aluminum bromide?

89.9%

5-2

If a unknown compound exists as 88.88% oxygen and 11.11% hydrogen, what is the molecular

formula of a compound with a molar mass of

144g/mol?.

H16O8

5-3

A water sample was found to have a pH of 6. What is the hydroxide concentration in the

water sample?

1 x 10-8

5-4

If I add 100 mL of water to 20 mL of a 5M

solution, what is the new concentration of the

solution?

.83 M

5-5

A student believes that if they add the metal calcium to

aqueous aluminum chloride, a single replacement reaction will occur. Is the student correct? If

so, write and balance the complete chemical reaction that

will take place.

3Ca + 2AlCl3 2Al + 3CaCl2