Nando performs experiments mixing ice at −5 ◦C and water at 40 ◦C. If you put a certain mass of ice and a certain mass of water, you notice that the final temperature is 0 ◦C and all the ice melts; If you now increase the mass of ice you used in the previous experiment by two kilograms (keeping the temperatures the same) and use the same mass of water, the final temperature is still 0 ◦C, but now all the water is frozen. Determine the two mass values ​​that Nando used in the first experiment

Referring to your experiment; if your first component that eluted with hexane was completely off, but you still had hexane at the top of the column, is it permissible to add the hexane-methylene chloride mixture? If so, why?

**I know it is not permissible because it would not be diserable, just looking for an explanation why.

Details: It was a Column Chromotography experiment. Three solvents are used: 1) hexane; 2) 1/1 hexane/methylene chloride; 3) 9/1 methylene chloride/methanol. Began eluting with hexane, then changed to solvent 2 and then 3.

Must show work

H₂(g)+ O₂(g)→ 2H₂ O(g)

1. How many grams of water will be produced if there 5.0 gram of oxygen?

2. How many moles of water will be produced if there are 2.0 moles of hydrogen?

3. You conducted the above experiment in the lab and found that the 10.0 moles of water are produced, how many grams you actually produced of water?

4. If you correctly done number 3, then it is your yield?

5. If you started out the experiment with 10.0 grams of oxygen, then calculate the percent yield?

In an early translational experiment, a cysteine already attached to its tRNA was chemically converted to an alanine. These “hybrid” tRNA molecules were then added to a cell-free translation system from which the normal cysteine-tRNAs had been removed. When the resulting protein was analysed, it was found that alanine had been inserted at every point in the polypeptide chain where cysteine was supposed to be. Discuss what this experiment tells you about the role of aminoacyl-tRNA synthetases and ribosomes during the normal translation of the genetic code.

Q. An experiment was set up to measure the yield provided by each of three catalysts in a certain reaction. The experiment was repeated three times for each catalyst. The reactor yields, in grams, are below. Catalyst 1: 84.33 90.25 85.62 Catalyst 2: 88.44 89.81 86.53 Catalyst 3: 94.71 91.19 92.81 (a) Construct the ANOVA table for this problem. (b) Determine if differences exist between the catalysts at alpha = 0.05. If there are differences in the catalysts, perform the appropriate multiple comparison procedure to determine which catalyst(s) results in the highest yield.

1. As described in Canadian Research 53.1, Ngai and Srivastava investigated the effects of predators on nutrient cycling by studying the detritus-based insect community in bromeliads in a Costa Rica rainforest. Discuss Ngai and Srivastava’s experiment and their findings, including the following:
   1. Explain why a single bromeliad plant can be considered an ecosystem.
   2. State the hypothesis that Ngai and Srivastava tested, briefly discuss their methods, and include a graph and brief explanation of their results.
   3. Explain Ngai and Srivastava’s statement, “[Our experiment] demonstrates that predation can have counterintuitive effects of nutrient cycling.”

An experiment was set up to measure the yield provided by each of the three catalysts in a certain reaction. The experiment was repeated three times for each catalyst. The reactor yields, in grams, are below.

Catalyst 1: 84.33 90.25 85.62

Catalyst 2: 88.44 89.81 86.53

Catalyst 3: 94.71 91.19 92.81

A) Construct the ANOVA table for this problem.

B) Determine if differences exist between the catalysts at alpha = 0.05. If there are differences in the catalysts, perform the appropriate multiple comparison procedure to determine which catalyst(s) results in the highest yield.

1. Do you think all cell lines will respond the same way to the growth factors? Construct a hypothesis for this experiment.

EXPERIMENT IS: Transfer each cell line into three new flasks for a total of nine flasks. For each cell line: one flask gets platelet-derived growth factor (PDGF); one gets epidermal growth factor (EGF); and one gets no growth factors. Allow cells to grow for 24 hours. View cells under the microscope, and count cells in three fields of view.

Recall the looser pay winner auction experiment done in class.

(a) Discuss how these experiments explain why the bidders changed their minds toward wanting to bid well above the value of the prize, even though they refused to do so at the begging.

(b) Discuss how the experiment explains why George Bush and many citizens changed their minds about a "preemptive" attack on Iraq.

(c) Also explain why England wanted to tax trade in the American colonies; which led to rebellion and the formation of the United States.

A study of cell phones and the risk of brain cancer looked at a group of 500 people who already have brain cancer. The investigators matched each brain cancer patient with a person of the same sex, age, and race of someone who did not have brain cancer. The researchers then asked these individuals about their use of cell phones. What type of study is this?

Question 1 options: