CH 101 Fourteen Session Lab Schedule Spring 2014

Scientists study the impact of changing only one component of a cancer treatment in a laboratory. Which of the following describes the study? controlled experiment observational study conceptual model computational study

You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.

urses/55527/quizzes/401369/take → # 3 Complete the data table using the calculation process you used to complete the previous question. Be sure to keep a copy of the completed table to include in the lab report for this experiment. $ Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 4 1.00 M Acetic Acid volume HC₂H3O2 25.0 mL 25.0 mL 25.0 mL 25.0 mL 25.0 mL Q Search f5 % moles 5 f6 Mole Ratio 6 HC₂H3O2 : NaHCO3 3:1 2:1 *All values should contain three (3) significant digits. 1:1 1:2 1:3 U hp NaHCO3 Molar Mass: 84.007 g/mol moles fg * 99+ 8 a fg mass needed DO 9 f10 ► 11

The Covid-19 pandemic has many experts commenting on the science associated with the virus - origins, vaccines, monoclonal antibodies, masks, social distancing.  It is important to consider what the experts say, but to also evaluate their statements.  We will start with the scientific method.  I want you to outline the scientific method from what you have been taught in previous classes.  You can list steps, parts, process, short descriptions, whatever.  If not taught in previous classes, then you will make your best guess about it.

Instructions You are required to produce a short lab report using the information given in the accompanying document, ‘Lab report assessment_student data’. This document introduces an experiment, and also provides a set of experimental data for this experiment. You are required to use this data to perform steps 8 and 9 of the procedure. This includes calculations of a particular value, and then comparison to the true value. Consider any experimental errors when comparing calculated values and true values. Your report should be between 300 and 500 words (including all table contents and titles of tables and graphs). Your lab report should consist of three sections only: • Experimental • Results and Discussion • Conclusion You do NOT need to include an introduction section. Your experimental section should be written in appropriate lab report format, (passive voice, 3 rd person, in paragraphs). Your results and discussion section should contain the data presented in table format, and…

5. A student mixed 5 mL of 3% m/v H202 with 10 mL of 0.5M IKI solution and measured the volume of water displaced over time. Use their data to prepare a plot of volume water displaced (mL) versus time (s) in Excel and find the rate of this run. Attach your spreadsheet and plot to your pre-laboratory assignment. Volume of Water Displaced (mL) Time (s) 2.0 39 4.0 76 6.0 106 8.0 137 10.0 166 12.0 192 14.0 222 16.0 242 18.0 20.0 270 302 Rate =

26) The floor tiles in SE 27 are about 1 square foot and the lab is about 25 tiles wide and about 36 tiles from front to back. When the emergency shower was demonstrated, in 10. seconds the water in the trash can was about 1 foot deep. One student estimated this was 2.5 gallons. Estimate how deep the room will get in inches after a 15 minute shower. List 3 simplifving assumptions you make in this calculation rea L-36 Tile fiDw ill it cost2 The density of gold is 27l An artist plans to apply gold leaf to a painting with an area of 2.32 f? and a thickness of 1.50

Dissolution Distilled H20 Concentration 0.01 M HCI Concentration (mg/ml) Time Total amount A Total amount A (mg/ml) (mg) (mg) 5 0.16 0.1 10 0.24 0.18 15 0.35 0.25 20 0.48 0.34 25 0.58 0.4 30 0.67 0.5 1. Plot the given data on an ordinary paper and find the slope for each line then calculate the IDR constant for aspirin in the two dissolution media, water and HCI. NOTE: Slope of the calibration curve = 1.0 (mg/ml and saturation solubility of salicylic acid is equal to 2.0 gm/L.

#3

Olympic athletes are tested to see whether or not they are using illegal performance-enhancing drugs. Suppose that urine samples are taken and analyzed, and the rate of false positive results is 1%. Suppose also that it is too expensive to refine the method to reduce the rate of false positive results.We certainly do not want to accuse innocent people of using illegal drugs. What can you do to reduce the rate of false accusations even though the test always has a false positive rate of 1%?

For a field ecology project, you count the number of individuals of different ages found in a population during a single time period. There are 100 newborns, 40 1-year-olds, 15 2-year-olds, 5 3-year-olds, and 0 4-year-olds. Use these data to fill in the Nx, Sx, and Ix columns of a static life table.

Mock Crime Scene Scenario: The police were called to an apartment to investigate complaints of a suspicious sound of a gunshot. The door was locked, so the police entered the apartment with force. A woman was found dead in the apartment, from a fatal gunshot wound to the head. Since she had a gun in her hand, the Medical Examiner is questioning if this was a homicide or if she committed suicide. A neighbor was questioned and told police that she saw the woman’s ex-husband enter the apartment earlier that day. She heard arguing that escalated into screaming right before she heard a gunshot, which prompted her to call the police. The crime scene was processed by police to locate as much evidence as possible. A suicide note was found on the counter. A pen found next to the suicide note was also collected. Multiple cigarette butts were found in an ashtray near the suicide note. A cigarette was found in the woman’s left hand. A gun was found in her right hand. Both were collected as…

SHOW WORK. DON'T GIVE Ai generated solution

Read through each scenario. Under the scenario, write which lab safety rule is being broken and indicate the proper protocol for each. 1. Jane is participating in a lab in which she blows carbon dioxide into a beaker of chemicals. Some of the chemical bubbles up and gets in her eye. Her lab partners tell her to use the eye wash fountains to rinse her eye out; however, she does not know where the eyewash fountains are located. 2. Mike and Colleen had a lot of a chemical left from their investigation. They dumped the chemical in the sink and left the water running in the sink as they left class

What are the advantages of a microscale lab?

Which of the following is an example of good lab safety practices?     Handling chemicals without wearing your PPE.     Taking off your goggles if you're not using chemicals, even if the person next you is working with chemicals.     Wearing shorts in lab.     Placing a cap on all chemical containers when not in use.     Wearing sandals or flip-flops to lab.

Please answer questions 3 and 4 and show work please. Thank you

Give an example of an organic chemistry laboratory process that involves medium to high severity and likelihood, and list precautions that can be taken to lower the risk.

Aoife studies a culture flask of microorganisms. The culture flask has a total volume of 1,000 mL. Every day she takes a 50-mL sample and replaces the volume with sterile media so the total volume in the flask remains the same. After 3 days, what percent of original culture remains?  When performing the math, don't forget that every sampling event counts as a dilution. Perform all calculations in a single step using Excel to avoid accumulating rounding error. Report your answer to 2 decimal places.

Please show the steps to find "k" in Red.

According to Falk and Fehr (2003), what are three objections to lab experiments? Meyer (1995) lists nine threats to internal validity of natural experiments. Describe three.

How to find the 'K" value using the date in the tables for experiments 1-4