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)
a. Identify the steps of the scientific method. (5 points
b. Answer the following questions about the experiment.
Answers: 1
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 16:50
Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m
Answers: 3
Chemistry, 22.06.2019 20:20
The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.
Answers: 1
Chemistry, 22.06.2019 22:20
Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?
Answers: 2
2. A scientist read an article in a magazine about how air pollution can cause children to develop...
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