Copy of Project 5 Rock Candy Report

5. Suppose you have a mixture of water and your 2-chloro-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-chloro-2-methylbutane (organic phase) b. water (aqueous phase) c. there would only be one phase since the substances are miscible

Calculations are based off of my data table.  I'm not sure how to answer the questions. 1.Based on the results of your experiment, do you have hard or soft water? Does this match the data for your area? Briefly explain your answer. 2.How much calcium would you ingest by drinking one 8 oz glass of your tap water? Show all calculations. 3.What percentage of the recommended daily dose of calcium (1,150 mg/day) does 1.0 L of your water provide? Show all calculations. 4. A complexometric titration can also be used to determine the amount of calcium in milk. The calcium concentration in milk is typically 1,200 mg/L. How would you alter the procedure used in this experiment to determine milk’s calcium content?

Directions Through the given situations below, answer the following questions 1 A mixture of monosodium glutamate, white sugar, salt and benzoic acid is to be melted by a group of Grade 7 students to determine the behavior of the mother during melting Predict how the mixture will look like as it is being heated. Explain your answer SUBSTANCE Sali White sugar Monosodium glutamate Benzoic acid MELTING POINT 801 C 186 C 232 C 122 C 2. Theo wants to observe what will happen to substance X (melting point is at 78 C) after heating it on an evaporating dish. After heating for a few minutes, substance X starts

Blank 1 is the breakdown of chemical compounds in organic matter that results in the release of nutrients in soluble inorganic forms that are available to plants. Blank 1 Add your answer

A student peeled the skins from grapes, exposing cells with membranes that are only permeable to water and small diffusible solutes. The student measured the mass of the peeled grapes. The student then placed each peeled grape into one of five solutions. After 24 hours, the student removed the peeled grapes from the solutions, measured their final mass, and calculated the percent change in mass (Table 1). TABLE 1. PERCENT CHANGE IN MASS OF PEELED GRAPES IN SOLUTIONS Concentration of Solution Solution Percent Change in Mass (weight/volume) Distilled water 0% 13.48% Naci 20% -23.39% Tap water 0.8% 9.46% Grape juice 2.1% 2.8% Grape soda 13% -15.00% In a second experiment (Table 2), the student placed a peeled grape into a solution containing both small diffusible solutes and solutes to which the membrane is impermeable (nondiffusible solutes).

Is this correct for the diaper dissection lab

12. The unknown liquids you will use in this experiment are the three compounds below. Draw Lewis structures of each of these compounds. (A Google search for these structures might be helpful.) Isopropyl alcohol Water Hexane

Is this molecule soluble in water?

ANSWER NUMBER 12-15 ANSWER ONLY THEN AFTER THAT PLEASE ANSWER PART 2 ANSWER ONLY

Subparts 4-6

Pre-lab question #4: Distinguish between volatile and nonvolatile substance. The word "volatile" refers to a substance that vaporizes readily. Volatility is a measure of how readily a substance vaporizes or transitions from a liquid phase to a gas phase. A A (volatile/nonvolatile) substance refers to a substance that does not readily evaporate into a gas under existing conditions. A AA (volatile/nonvolatile) substance is one that evaporates or sublimates at room temperature or below.

_4. Preservatives that are usually found in cured meats, bacon, ham, corned beef and hot dogs. A. Benzoates C. Sorbates В. Nitrates D. Acids 5. A type of additive that stabilizes foods through moisture control. A. Emulsifiers C. Humectants B. Flavor Enhancer D. Antioxidants 6. Additives that are usually powders added to baking mixtures which react chemically to release carbon dioxide. A. Raising Agents B. Thickeners C. Humectants D. Antioxidants

What is the purpose of Safety Data Sheets? Why are these important when handling common food service chemicals? What information/components are generally included? How do Safety Data Sheets vary?

Which of the following statements is not true?   a. It is okay to taste a chemical   b. No food or drink, including water, is allowed in laboratory   c. Read and re-read labels on containers of chemicals before opening them   d. Dispose the chemical waste to appropriate waste container

1. You have a concentrated stock solution of bacterial LPS in water that has a concentration of 1 mg/ml. What is the concentration of a diluted solution with a dilution factor of 1:2? 2. Your stock solution is 1 mg/ml and your final solution is 1ug/ml. What is your dilution factor? 3. A 1 ug/ml solution is diluted so it is half as concentrated as the stock. What is the concentration of the new solution in ng/ml?

4. Calcium Hydroxide Solution (Lime Water) and olive oil are used because an emulsifying agent is formed in situ when these 2 solutions are agitated together. What is the emulsifying agent that is formed? a. calcium succinate b. calcium oleate c. succinic hydroxide d. palmitic hydroxide

Based on a grade 11 chemistry student, answer the following questions: Use the data below to evaluate whether nitrates or phosphates could have been involved in the fish kill. Which month had the highest river water temperature?    2. Which month had the lowest river water temperature?   3. How would the temperature of the water likely affect the solubility of dissolved solid solutes?   4. Which month had the most rainfall?   5. Which month had the least rainfall?    6. In which months would you expect to have more runoff from the fields to the river?   7. In which months would you expect more dissolved solutes in the water? Explain.   8. The fish kill occurred in December.  a. What was the average water temperature and rainfall for November and December?  b. What would you expect farmland to look like during this month?  c. Would you expect much fertilizer runoff during these months? Why?   9. How do nitrates and phosphates generally cause fish kills? (Look back at your previous…

10. Draw a graph of the concentration of NaCl (x-axis) against the calculated density (y-axis) for the data in section B above. Find the straight line equation. The graph has to be manual on graph paper, and you should draw a best-fit straight line. 11. Calculate the density of 35% NaCl from your graph.

These questions are not graded! It is strictly for practice. Do questions 1-5.

Part D: Volatiles. A 1.232 gram sample of copper complex weighed 0.783 g after heating. What is the percent of volatile material in this sample? If the sample contains 17.4% ammonia, what is the percent water in the sample?

Most of us have had a glass of water from a Brita® pitcher. What is inside of a Brita® filter cartridge and what does it filter out? What doesn’t it filter out?

LAB :DETERMINATION OF ALCOHOL CONCENTRATION IN WINE by distilling 1. How can we know that all the alcohol has distilled away from the wine? Explain. 2. Generate a graph “Temperature vs Volume of Distillate”. Was the temperature constant during distillation ? Explain why it should be so or not so

Sam drops a sugar cube into a jar with hot water and a sugar cube into a jar with cold water. Both jars have the same volume of water. He drops the sugar cubes at the same time and then observes how much of them dissolves in two minutes. What will be the result of Sam’s experiment, and which statement should he use as his conclusion? A A greater amount of sugar dissolved in hot water because temperature is directly proportional to the solubility rate of sugar in water.   B Temperature does not affect the solubility rate of the sugar cube in water because sugar dissolves equally in both cold and hot water.   C A greater amount of sugar dissolved in hot water because temperature is inversely proportional to the solubility rate of sugar in water.   D A smaller amount of sugar dissolved in cold water because temperature is inversely proportional to the solubility rate of sugar in water.

1. A stock solution of I2 is standardized using a 0.1430 g sample of pure ascorbic acid. The titration to the starch endpoint required 25.45 mL of the I2 solution. Calculate the molarity of the I2 solution. 2. A vitamin C tablet was divided into three equal mass portions. One portion was crushed into a fine powder, dissolved in water, and titrated with the standardized solution from question 2 (above). The titration to the endpoint required 27.60 mL of the I2 solution. Calculate the number of milligrams of vitamin C that are in the original tablet.

Physical Analysis of Water Samples A. WATER POLLUTION VIDEO a. Describe the three categories of water pollution. b. What is eutrophication? What are the uses and effects of eutrophication? c. Describe the emical pollutants in water. FOR PLMYSICAL SCENCE DEPT USE ONLY d. Describe the ways of reducing water pollution.

PART 4-LABORATORY SAFETY QUESTION 1. In what situations should safety goggles be worn? 2. Why aren't glasses approved as protective eyewear? ANSWER 3. Where is the first aid kit located? 4. Where is the eyewash station located? 5. Where is the fire extinguisher located? 6. What does ABC represent on the fire extinguisher? 7. How is a fire extinguisher operated? 8. Which exit do you use when the fire alarm sounds? 9. Where is the broken glass container located? 10. Where is broken glass placed? 11. Why is there a separate container for glass and paper? 12. Why is no food or gum or drink allowed in the lab? 13. What should be done with long hair during a lab? 14. Why is it dangerous to sit on the lab benches? 15. Why must your lab work area be kept clear of clutter? 16. Why is there no carpet in a science laboratory? 17. Which way do the doors of a science lab open? Why? 18. If your teacher tells you to smell a substance during a lab, describe the correct procedure for smelling it. 19.…

Activity 6: Be a Science Detective! Directions: Investigate and analyze the given situation. Provide an explanation for the phenomenon. Based on the kinetic molecular model, solids usually have higher densities compared to liquids. However, ice, a solid form of H2O floats on liquid water which means ice is less dense than water. What do you think is the reason for this phenomenon? What is the biological significance of this concept?

In the lab background and part II section A of the lab protocol, you calculated the amount of 0.1 M sucrose stock solution and the amount of dH2O needed to prepare 100 mL of unbuffered 20 mM sucrose. Enter your numbers only. What is the amount of 0.1 M sucrose stock needed in mL? What is the amount of dH2O needed to bring to final volume? QUESTION 11

Use the following information to answer numerical-response question 10. Crude oil is separated into different groups of hydrocarbons, or fractions, in a fractional distillation tower. Two different locations at which fractions can be removed from the tower are labelled in the diagram below. Numerical Response Fractional Distillation Tower Crude oil K-11090 the greatest amount of CH4(g) is numbered the largest molecules is numbered molecules with the highest boiling points is numbered 10. Match the numbers of the locations in the diagram above with the descriptions of the fractions that could be removed as given below. The location with the fraction that contains molecules that are least attracted to one another due to weak intermolecular forces is numbered Location 1 190071 Location 2 zonirabi woll (Record in the first column) (Record in the second column) (Record in the third column) (Record your answer in the numerical-response section on the answer sheet.) (Record in the fourth…

Pls help ASAP ON ALL ASKED QUESTIONS PLS PLS