A hand sanitizer was advertised to be more effective at killing bacteria than any antibacterial soap. Students were split
evenly into 4 groups test this claim. Groups 1-3 washed their hands using the assigned hand sanitizer or soap (see
table) and warm water for two minutes, and then dried their hands with a paper towel. Group 4 rubbed their hands
vigorously for 2 minutes in warm water, without any soap or sanitizer, and then dried their hands with a paper towel.
After washing, each student’s hands were swabbed and the swab was applied to a culture plate and incubated. Finally,
the bacterial cultures were counted.
Treatment Bacteria Growth (# of bacteria)
Group 1: Hand sanitizer 28
Group 2: Soap A 12
Group 3: Soap B 13
Group 4: Warm water 24
A. What are the independent and dependent variables in this experiment?
B. Based on the claims of the hand sanitizer advertisement, what was the hypothesis for this experiment?
C. What is the control group?
D. What are 3 constants?
E. Based on the results in the data table, was the advertisement supported or refuted/rejected? Explain your answer.
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Ответ:
A) IV: Hand Sanitizer/Soap ; DV: #of bacteria
B) Hand Sanitizer is more effective in killing bacteria than Hand Soap.
C) Group 4 since they used neither product
D) Group 1, Group 2, and Group 3
E) The advertisement was rejected, because Hand Sanitizer was supposed to kill more bacteria, when in reality the Hand Soap did.
Explanation:
Hope this Helps!!
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Ответ:
Ans: P = 22.5% and Cl = 77.5%
Given:
Total Mass of sample containing P and Cl = 50.51 g
Mass of P produced = 11.39 g
To determine:
Mass % of P and Cl
Explanation:
Mass % of a given element in a total mass is generally expressed as:
Mass % of element = [mass of element/total mass]*100
Here,
Total mass = mass of P + mass of Cl
mass of Cl = Total - mass of P = 50.51-11.39 = 39.12 g
% P = [11.39/50.51]*100 = 22.5%
%Cl = [39.12/50.51]*100 = 77.5%