Question

# 1.    Lab 2: Scientific notation and significant figures -Answer the following:

Use: 6.022E23 rather than 6.022 x 1023

·      ((8.675)(3.09) + 115.2) =

·      (123.45/23.56)(144.36 + 12.1234) =

·      15.6 + 0.32145 =

·      (15.6)(0.32145) =

·      1.00 + 1.0 =

2.    Lab 3: Solubility, Miscibility and Density-

Using the table below answer the following questions:

·      If you filled a balloon with air, would it float on a tank of chlorine gas?

·      Does it seem that salt and minerals are more dense or metals?

·      If lava has a density of 3100 kg/m3 do you expect a brick to float on it? What about the gold ring of power from the lord of the rings?

3.    Lab 4: Graphical Analysis of Data -

Based on the plot below, answer the following questions:

·      Does the bonding energy increase faster over a small distance or a large one?

·      If the energy of the bond was measured somewhere between -425 and -436 kJ/mol would you expect the distance r to be closer to 60 - 80 pm or 70 - 100 pm? Why?

·      What sign is the bonding energy at 150 pm?

·      What is the sign of the bonding energy at 1 pm?

·      There are two values that the curve will never reach (asymptotes). One is on the y-axis at r approaches 0pm the energy approaches infinity. This means it will never hit 0 pm. Describe the other asymptote on the x - axis. What value will the energy never reach with increasing r?

4.    Lab 5: Lewis Structure and Molecular Geometry[10pts]

I was really unhappy with the answer to this question in grading the exams. So I will ask it again, verbatim. This time take the time to draw your own pictures and attach the picture file to the email.

·      CO2

·      H3PO4

·      H2SO4

·      SO2

·      SF4

5.    Lab 6: Nomenclature -

Provide the name and the correct classification of its bonding (ionic, polar covalent, or non-polar covalent) for each component of the following chemical reaction:

Pb(NO3)2 + 2 KI → 2 KNO3 + PbI2

6.    Lab 7: Paper chromatography of M&M candy dyes -

In the following picture, rank the molecules (a, b, and c) from most polar to least.

7.    Lab 8: Identification of Household Chemicals as Acid/Base with Red Cabbage -

There were many pH ranges for the compound in red cabbage. It was able to alter its coloration over a wide range. What would the pH ranges be at the indicated steps of the following procedure:

i.    A solution has a green-yellow color

ii.    To that solution, vinegar is added, and it begins to bubble. When calm the solution is a blue color.

iii.    More vinegar is added and the solution stops bubbling, it now has a violet color.

iv.    When the rest of the vinegar is added it maintains a red to pink color.

8.    Lab 9: Mole problems, Supersaturated Solution -

What volume of a 0.380M CaCl2 solution does it take to completely react with 182.3 mL of a 0.675 M solution of Na2CO3 to form NaCl (aq) and insoluble CaCO3? [10 pts]

9.    Lab 10: Double displacement Reaction and Osmosis -

Which of the following reactions represents a situation where water would flow into a system?

a.     There is a high salt concentration outside of a cell (cell is the system)

b.    There is a high sugar concentration outside of a cell (cell is the system)

c.     There is a high sodium concentration inside of a cell (cell is the system)

d.    There is a high water concentration inside of a cell (cell is the system)

Image transcriptions

Material Density(kgm Material Density(kgm Solids Liquids Gold 19300 Water 1000 Uranium 19050 Mercury 13546 Copper 8930 Methyl alcohol 792 Iron 7870 Steel 7860 Gases Marble 2600 Chlorine 3.2 Concrete 2400 Carbon Dioxide 1.98 Brick 2300 Air 1.3 Wood (oak) 650 Helium 0.18

potential energy 74 pm attractive forces repulsive forces -436 KJ/mol most stable state