1.†††††††† The synthesis of water can be represented by the following equation:

††††††††††† 2 H2(g)† +†††††††††† O2(g)†††††††††††††††† †††††† 2 H2O(l)

a.†††††††† What are two possible meanings for the 2 in front of H2O?††††††† moles or molecules

b.†††††††† What does the arrow indicate?††††††††††††††††††††††††††††††††††††††††††††††††† To produce

c.†††††††† What are the reactants?

d.†††††††† How many molecules of oxygen will react with every 2 molecules of hydrogen?††††††††††††† one

e.†††††††† Suppose there were 6 molecules of hydrogen. How many molecules of oxygen would completely react with the hydrogen?

††††††††††† 3 molecules

f.††††††††† The water that is produced is in what physical state ? (Solid?, liquid?, etc)

††††††††††† liquid

2.†††††††† One way to analyze the amount of salt in meat is to extract it with boiling water and to use a chemical that indicates when the following reaction is complete:

††††††††††† NaCl(aq)† +††††††† AgNO3(aq) ††††††† †††††† NaNO3(aq)†† +††† AgCl

a.†††††††† What does the arrow after silver chloride indicate?

††††††††††† There was suppose to be an upside down arrow to indicate that a precipitate forms.

b.†††††††† Is the sodium chloride dissolved in water?† How do you know?

††††††††††† Yes from the (aq) symbol

c.†††††††† In all how many nitrogen atoms are on the L.H.S. of the equation?

††††††††††† 1

3.†††††††† Recopy the following equations and completed charts( that track the number of atoms of each type) on loose leaf:

a.†††††††† 2 C4H10†† +†† 13 O2 †††† ††8 CO2†† +†† 10 H2O

Atom

LHS total

RHS total

C

2(4) = 8

8

H

2(10) = 20

10(2)=20

O

13(2) = 26

8(2) + 10(1) = 26

b.†††††††† 2 H2O2 O2† + 2 H2O

Atom

LHS total

RHS total

H

2(2) = 4

2(2) = 4

O

2(2) = 4

2 +2(1) = 4

     

4.†††††††† The last step in the synthesis of a poison known as nicotine is given by the following reaction:

††††††††††† C10H14N2†††††††† +††† CH3I†† +†† NaOH†† H2O† + C11H14N2† + †††††††††† NaI

††††††††††† 162 g††††††††††††††††††† 142 g†††††††††† 40 g††††††††††† 18 g††††††††† __?__g†††††††††† 150 g

How many grams of nicotine were produced if the above amounts reacted to also produce the given amounts of sodium iodide and water?

††††††††††† 162 + 142 + 40 = 18 + x + 150

††††††††††† x = 176 g

5.†††††††† Whereas human females apply Chanel No. 5, the product of this reaction is what female tsetse flies use to attract mates. How much of it is produced if the given amounts completely react?

††††††††††† C37H72† + 2 H2††††††††††††††††† C37H76

††††††††††† 516 g††††††††† 4g† †††††††† †††††††††††††† __?__g†

††††††††††† 520 g

6.†††††††† A useful insect repellent (Girls are may be asking whether it works as an undesirable male-repellant) can be synthesized according to:

††††††††††† C7H11ClO3† +††††† C4H11N†††††††† †††††C11H21NO3† +††††† HCl

††††††††††† †† __?__g†††††††††††††††† 73 g† ††††††††††††††††††† 215 g††††††††††††† 36.5 g

††††††††††† How much C7H11ClO3 is needed to produce 215 g of the repellent?

††††††††††† 178.5 g

7.†††††††† Because of propane s simple chemical structure, it usually burns cleanly. Unlike gasoline, in a well-ventilated area it will not produce much soot or carbon monoxide. But it does produce the greenhouse gas carbon dioxide, which has been accumulating in the atmosphere since the Industrial Revolution.

Hydrogen would be a more environmentally-friendly fuel. Based on what you know about chemistry would hydrogen burn to produce ....

a.†††††††† carbon dioxide?††††††††††† Why?† There is no carbon among the reactants when hydrogen burns; itís H2 reacting with O2.

b.†††††††† carbon monoxide?† ††††† Same reason