April 1 Convert as asked and show work. 1.Convert 35 lb/in 2 to kg / cm 2. 2.Convert 150 km/hr to...
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Transcript of April 1 Convert as asked and show work. 1.Convert 35 lb/in 2 to kg / cm 2. 2.Convert 150 km/hr to...
April 1
Convert as asked and show work.
1. Convert 35 lb/in2 to kg/cm2.
2. Convert 150 km/hr to mile/hr.
April 3Convert as asked and show work.
1. Convert 77 g of NaBr to moles.
2. Convert 4.2 moles of ZnCl2 to grams.
April 7
Convert as asked and show work.
1. Convert 0.78 moles of CsBr to molecules.
2. Convert 5.4 x 1023 mc of CsBr to moles.
April 9
Convert as asked and show work.
1. Convert 250 g of LiF to molecules.
2. Convert 7.3 x 1022 mc of LiF to grams.
April 15
Convert as asked and show work.
The distance between Wichita and Washington DC is ______ miles. A single paper clip is 2 cm long. How many trips between Wichita and DC could be made with a mole of paper clips?
April 17 : the data
Plot the mass of citric acid on the x-axis and vol of CO2 on the y-axis.
Find the slope of your line.
Mass citric acid, g
Vol CO2, cm3
0.1 5
0.2 10.2
0.3 14.7
0.4 19.3
April 17: the graph
April 21Tensile strength with and without pre-stretching of various types of
rubberbands
Average Tensile strength at 25 oC, N/mm2
Rubber-band type
no pre-stretching
pre-stretching
A 52 52
B 100 82
C 87 86
D 4 4
Four types of rubber bands were cut to form single 10 cm long strands with cross-sectional areas of 3 mm2. Each rubber band was stretched until broken. The force needed to break the band was recorded. Twenty-five rubber bands of each type were tested, and the data were averaged, as shown in Tensile strength data table.
April 21 Graph the rubberband data with an appropriate title and label on axes. You will need a key to do this correctly.
April 23
Average Tensile strength vs temperature and type of rubberband
Tensile strength, N/mm2
Rubber-band type 10 oC 50 oC
A 68 39
B 110 92
C 87 81
D 4 2
Graph the rubberband data with an appropriate title and label on axes. You will need a key to do this correctly.
April 23
Graph the rubberband data with the appropriate title and axes labels. A key will be necessary.
April 27Type of solid
Melting behavior
Solubility in water
Electrical conductivity
Impact behavior
Ionic Most melt between 600 oC and 1500 oC
Some are soluble.
Conductive when melted
Shatters
Molecular
Most melt between -150 oC and 300 oC
Most are not soluble.
Non-conductive
Shatters
Metallic Most melt between -39 oC and 3400 oC
Most are not soluble.
Conduct as liquids or solids
Malleable
Covalent network
Most melt between 1000 oC and 3000 oC
Most are not soluble.
Noncon-ductive except for metalloids and graphite
Shatters
April 271. A substance decomposes at 308 – 310
oC, is insoluble, nonconductive, and shatters. Based on this information, how should this solid be classified?
2. Another substance is nonconductive and cannot be melted in a burner flame of 800 oC. Based on this information, how should this solid be classified?
April 29
Temperature and Time vs Number of Corn Seeds Sprouting
Temp, oC
Total Corn Seeds Sprouted
7 days 14 days 21 days
5 0 0 0
20 25 37 44
35 50 70 80
50 2 3 3
April 29 questions
1. Based on the data table, what are the independent variables?
2. Based on the data table, what is the dependent variable?
3. What are three things that would need to be constant for a fair test?
4. What temperature is best for corn seeds to sprout?