June 12, 2017 Name 35. An anion is an atom that A. gained a proton B. lost a pro
ID: 90979 • Letter: J
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June 12, 2017 Name 35. An anion is an atom that A. gained a proton B. lost a proton C. gained an electron D., lost an electron 36. Benedict's reagent is used in a lab to test a substance for the presence of A. reducing sugars B, starches IMAX D. lipids 37. Using the picture to the right, how much water would you determine to be in the graduated cylinder? (remember to write the unit!) cause 38. what you about special properties of water, what would water in the graduated cylinder to form the meniscus? A high specific heat B, hydrogen bonds. c high surface tension D density of water 39. An atom with 5 valence electrons in the second energy level would have electrons B. be called a positive ion (cation) C, need 3 more electrons o become stable D, have five neutrons A researcher trapped and weighed mice living in three different locations. The following summary data was then compiled. Use the information to answer the following 3 questions Mice outside Mice in the woods Mice in a barn nage weight (s) rd devianon (g) g, 35) o 9,4 44) nce interval 40.68% of the mice sampled in the woods weigh between A 31-3.3g B. 2.8-36g 29-3.5g D. 24 4.0g 41. which population of mice sampled had theleast variation in individual weights? A woods outside restaurant C mice in a barn 42. Using the confidence interval values, which groups most likely differ statistically? A woods vs. restaurant B. restaurant vs. barm C. woods vs. bam D. woods vs. restaurant & woods vs. barn restaurant vs bam & bam vs. woodsExplanation / Answer
35.
c. Gained an electron.
Anion is the one gained electron (eg: Cl-, F-)
Cation is the one lost electron (eg: H+, Ca2+)
36.
a. Reducing sugar
Reducing sugars have free ketone or aldehyde functional groups and can transfer hydrogens to other compounds. When reducing sugars are incubated with Benedicts reagent and heated, a color change occurs due to reduction reaction.
37.
8.8 mL
The meniscus is concave. Therefore, we must record the reading at the meniscus at the of middle of the meniscus.
38.
c. high surface tension
Meniscus can be concave or convex. It depends on the surface tension of the liquid and adhesion to the wall of the measuring cylinder.
39.
c. need three more electrons to be stable
5th group elements have 5 valence electrons. They need 3 more electrons to get 8 valance electrons (nearest noble gas configuration).
40.
b. 2.8-3.6g.
One standard deviation around mean constitute 68% observation.
Two standard deviations around mean constitute 95% observation.
Three standard deviations around mean constitute 99% observation.
Average for woods is 3.2g and standard deviation is 0.4.
One standard deviation around 3.2 is 2.8-3.6.
41.
b. mouse outside a restaurant.
They have least standard deviation (0.2) compared to the other two groups (0.4 and 0.7).
42.
a. Woods vs restaurant
When we want to find the mean weight of mice, we randomly collect few mice and measure their weight and find the average of the weights. But it is a small representation of a huge population. If we repeat the experiment we may get a slightly different mean next time. To estimate in what range, the mean may vary, we would calculate confidence interval.
Confidence Interval (CI) of mean is a range of values where actual mean lies when we do the measurement repeatedly.
If we see the range of CI for all the three groups we would find that CI of wood and barn are overlapping. So, the difference between thee to is not very much.
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