2. A scientist read an article in a magazine about how air pollution can cause children to develop asthma. Since the article did not come from a peer-reviewed magazine, he doubted
the claim, instead believing that children living in a smog-filled city would not have an
increased chance of developing asthma. He wanted to test his own idea, so he formed a
hypothesis and planned out an experiment. The scientist decided to compare 10th graders
from three schools in smog-filled cities to 10th graders from three schools in smog-free rural
areas. He found out how many of these students had asthma and recorded his data in the
table below. After looking at the results, he was amazed at what a big risk factor living in a
smog-filled city was after all. (20 points)
Students in City Schools
Students in Rural Schools
School
Percent of
Percent of
Number of Number of
Number of Number of
students in
students in
students in oth graders
students in 10th graders 10th grade
10th grade
10th grade with asthma with asthma 10th grade with asthma
with asthma
1
492
126
3
249

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000

What are the 4 phases of matter in order of increasing engery content?

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?