Experiment 3: osmosis – diffusion and concentration gradientsTable 6: sucrose concentration vs. tubing permeability1. For each of the tubing pieces, identify whether the solution inside was hypotonic, hypertonic, or isotonic in comparison to the beaker solution it was placed in.2.
In the results section tabulate your final results (mean and standard deviation) for all parts of the experiment including the solution 2A readings in Part 2 step 4 and readings taken over time.
Construct a graph, plotting standard deviation on the y-axis and glassware size used to prepare solutions on the x-axis (omit solution 2A readings in Part 2 step 4 and readings taken over time). Discuss the results of the graph.
In your conclusion address the following: A) Did you achieve the purpose of your experiment?
B) Which method of preparing the solutions results in the least variability (i.e. standard deviation)? How does the variability of each method compare with the variability of solution 2A taken in Part 2 step 4 and taken over time. Explain.
C) What is the source of the variability of solution 2A taken in Part 2 step 4.
D) What is the source of the variability of solution 2A taken over time.
E) If you had to prepare the solutions again what would be the most precise and efficient peace of glassware (pipette, 10mL graduated cylinder, 100mL graduated cylinder or beaker) you would use, support you answer with data.
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Post-Lab Questions
1. Graph the data from Tables 4 and 5 as and send the graph to your instructor. . Points will be deducted for graphs not labeled. Construct your graph on a computer program such as Microsoft Excel®. If you do not have a graphing program installed on your computer, you can access one on the internet via the following links: http://nces.ed.gov/nceskids/createagraph/ or http://www.onlinecharttool.com
2. Calculate the overall temperature change for the cold pack (Tmax – Tmin). Show your work.
3. Calculate the overall temperature change for the hot pack. Show your work.
4. Which pack works by an exothermic process? Use experimental data to support your answer.
5. Which pack works by an endothermic process? Use experimental data to support your answer.
6. Write the balanced reaction between ammonium nitrate and water.
7. Which pack had the greatest change in enthalpy? How do you know?
8. Describe what would happen to the maximum temperature if the experiment used double the amount of hand warmers. Justify your answer.
9. Describe if and how the rate of temperature change would be affected if you crushed the cold pack crystals.
Explain how the law of conservation of energy was observed in this experiment.
I need help with 2 simple experiments ( first one with a concave lense- answering the post lab questions), and the other experiment just doing simple rau diagram calculations and finishing the ray diagrams. These shouldn’t take too long.
Experiment 1: Colors, Colors
The famous “Stroop Effect” is named after J. Ridley Stroop who discovered a strange phenomenon in the 1930s. Here is your job: name the colors of the following words. Do NOT read the words…rather; say the color of the words. For example, if the word “BLUE” is printed in a red color, you should say “RED”. Say the colors as fast as you can.
https://faculty.washington.edu/chudler/java/ready.html
1. Collect data (time) on yourself for the first set of cards and the second set of cards.
2. Post you results on the Lab discussion board.
3. Collect results from four other classmates and use it to complete table 1 and the questions below.
Table 1: Stroop Effect Test
Student
Word Set #1 (sec)
Word Set #2 (sec)
Average Time:
Questions:
1. Did you find that people could more quickly go through the set of cards with the words written in matching ink compared with words that were written in a different color ink?
2. How much variation was there among students within your “group”?
3. What relationship seems to exist between word meaning and word color?
4. What type of results would you expect if you tested a toddler that could recognize color but not words?
5. Can this kind of effect be replicated with other stimuli? Can an auditory Stroop effect be created?
Experiment 2: Reaction Time
Reaction time is the time between a stimulus and your response. Your nervous system processes the stimulus before you are able to react, and the time lag is your reaction time. Stimuli could be visual (sight), auditory (hearing), tactile (touch), olfactory (smell) or gustatory (taste). In this experiment, you will be measuring your reaction time when presented with two different visual stimulation activities.
Hit-the-dot activity: https://faculty.washington.edu/chudler/java/dottime.html
Stoplight activity: https://faculty.washington.edu/chudler/java/stopl.html
1. Collect data (time) on yourself for the two different activities.
2. Post you results on the Lab 9 discussion board.
3. Collect results from four other classmates and use it to complete table 2, table 3, and the questions below.
Table 2: Hit-the-Dot Activity
Student
Trial 1
Trial 2
Trial 3
Average
Table 3: Stoplight Activity
Student
Trial 1
Trial 2
Trial 3
Trial 4
Trail 5
Average
Questions:
1. Why did you find an average time? In other words, how is averaging useful?
2. What pathway does the stimuli for the different activities have to follow through the nervous system? (Hint: eyes à ….)
3. Did you find that some people are better at one activity compared to the other? Why might this be?
4. What might affect your reaction time?
5. Could you improve your reaction time? How?
Experiencing security problems on a personal computer can be a frustrating and even scary experience. If your computer’s security has been compromised any and all personal data is susceptible to attack or being stolen by black hat hackers. Knowing your computer is completely safeguarded from the majority of threats can provide peace of mind knowing that your personal data and children are safeguarded from malicious people. Since the customer wants to safeguard certain information from the children, I would recommend separate user accounts for the customer and their children. Additionally, since the customer has had several spyware installations, I would recommend verifying the Windows firewall settings to see if they are configured optimally. Andrews, Dark, & West (2017) state that, “best protection from attack is layered protection.” Further, since the children are most likely the culprits of installing the spyware I would set up the access control lists to not allow the users to not be able to download and install anything without permission from the parent account. An access control list, “determines what user, device, or program has access to a particular resource, whether that’s a printer, folder, file, or other resource” (Andrews, Dark, & West, 2017). Further, I would stress to the customer to provide some sort of education to their children on best security procedures when using the computer, simply educating the children can go a long way towards keeping the system secure.
Once on site and diagnosing the customer’s computer the first thing I would do is identify the symptoms. After diagnosing the computer, next, I would disconnect the computer from any connected networks. Next, depending on whether anti-malware software is installed or not I would update and run previously installed software or download and then run the software. Running anti-malware software, that is up to date, should resolve any spyware related issues on the customer’s system.
References:
Andrews, J., Dark, J., & West, J. (2017). CompTIA A guide to IT technical support (9th ed.). Boston: Cengage Learning.
*****MUST BE 100 WORDS******
Which statement best describes the views of migration presented in the Hungarian government report and the Swedish journalist’s essay?
a.They agreed that migration brought various benefits.
b.They agreed that migrants needed to work harder.
c.They disagreed on whether emigration was a benefit.
d.They disagreed on whether migrants were good workers.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.38 pounds. The weights follow the normal distribution. In an effort to increase their weight, a special additive is added to the chicken feed. The subsequent weights of a sample of five-month-old chickens were (in pounds):4.4 4.35 4.38 4.41 4.3 4.36 4.38 4.43 4.39 4.43
If total revenues for the year are $57,200, total expenses are $36,800, and dividends are $8,000, what is the ending balance in the retained earnings account after all closing entries have been made? 8. If working capital is $72,000 and the current ratio is 2.5:1, what are the effects of receiving cash by borrowing for 60 days on the last day of the year?
S = 3.58 seconds
(b) Compute the value for the test statistic (t0) in this case and use the t table to find bounds on the corresponding p-value.
(c) Can you reject the null hypothesis at the 5% level of significance? Explain.
(d) Write a conclusion in the context of the problem.
(e) Find a 90% confidence interval for the mean time for mice to complete the maze with the loud rap music.
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