Station 1
1. a. ______
b and c
brittle ductile stronger. weaker.
d
e
f
g
Station 2:
a) Contact Angle for A
Contact Angle for B
Contact Angle for C
b)
c)
d)
e)
f)
g)
Station 3
1.
2.
3.
4.
5
6
Station 4:
Lab data: Make sure you label the units, significant figures matter!
Sample / Mass / volumeLabel and draw a graph relating mass to volume.
What does the slope of this graph tell you?
What is the empirical density of aluminum based on your data?
Give one LABORATORY reason and one MATERIALS reason that the empirical density and the theoretical density may not be the same.
Use the phase diagram above to answer the following questions:
a) Determine the phase of the alloy with a composition of 20% Cu and a temperature of 1300 ºC.
b) Determine the composition and phase present at points A-D.
c) Draw a particle diagram for the point labeled C.
/
/
Use the phase diagram above to answer the following questions:
a) At 1800 °C, starting with pure chromium, describe (or use particle diagrams to show) what changes if any will occur as the percentage of vanadium is gradually increased until you reach pure vanadium?
b) What type of alloy does the Cr-V combination create?
c) Determine the melting point of an alloy containing 35% Cr
TEAM NAME ______Team #______
polystyrene
polyvinyl chloride
Nylon
Use the 3 compounds above to answer the questions.
a) What class of material would these compounds fall into?
b) Give at least 2 uses for each substance.
c) On the basis of structure, describe why one substance might be used instead of the other for two of the uses you gave in b.
The following table contains results from a lab where the temperature of a liquid was recorded as evaporation took place. Each substance was allowed to evaporate for the same amount of time and the change in temperature was calculated. All of the compounds had the same initial temperature.
compound / formula / structure / MW / Type of IMF / ∆T (°C)acetone / C3H6O / / 58.08 / -20.7
methanol / CH3OH / 32.04 / -19.9
butanol / C₄H₉OH / / 74.12 / -3.9
octanol / C8H18O / 130.23 / -1.1
pentane / C5H12 / 72.15 / -29.5,
water / H2O / 18.01 / -4.4
Using the table above answer the following questions
a) Fill in the column for type of IMF, you may use abbreviations, as long as you write a “key”
if more than type exists for that molecule, then put more than one type in the box.
b) What would the structure of octanol look like?
c) Which substance had the highest vapor pressure?
d) Which substance likely has the highest boiling point?
e) Explain why pentane has a change in temperature so much greater than that of butanol even though they have very similar molecular weights.
f) Explain why acetone and methanol have very similar changes in temperature even though the methanol weighs almost half as much as acetone.