Copy of Project 5 Rock Candy Report

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

out of Express your answer with three significant digits. Do not include units! g/mol A sample solution has a concentration of 12.4% by mass. What mass of solute (in g) is present in 50.0 g of this sample solution? Express your answer with three significant digits. Do not include units! g + Chemistry 20 Final Exam Equation Sheet (click to open) page 1 11

2. In case of an accident in the classroom, who should be notified immediately? 3. Why is it a safety procedure to tie back long hair in the laboratory? 4. Why should a student not eat or drink in the laboratory? 5. Why should any spills be reported and cleaned immediately? 6. Why should you wash your hands after every laboratory period? 7. Why is rough play in the laboratory dangerous? 8. When would the wearing of safety goggles be a proper procedure? 7

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

** I have been studying for a chemistry exam and this is a sample lab that I have off of YouTube. Hoping you can give me some sort of answer key. Thank you. The video is called “Performing a Dilution” on YouTube and answer the following questions 1. What materials (e.g. glassware) are required to perform a dilution? 2.list the steps followed to perform a proper dilution. Include all tips mentioned in the video 3. Why should you never use your mouth for drawing solutions up into a volumetric pipette?

Calculations. Show all calculations, formulae and units below; and give your final answers to the appropriate number of significant figures. 1. Determine the concentration of a diluted solution if 10.00 mL of the standard solution prepared in Part I is diluted to a final volume of 250.00 mL.

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.

Please answer question and give a brief explination why

4. Which mixture(s) can be separated into its components using filtration? A. oil + vinegar B. sand + iron filings C. pure water D. salt + sugar E. sand + water Examine the solubility chart below and answer questions 5-12 KNO le ww

he solubility of oxygen in water is about 4.5 x 10-2 g/L. The water portion of an adult's total blood supply is about 5 liters. How many grams of oxygen could dissolve in 5 liters of water?   A. 4.5 x 10-2 g/L   B. 0.23 g/L   C. 9.0 x 10-3 g/L   D. 110 g/L

I have 6 tubes with the contents labeled. How can I make a 20% concentration serial dilution? Please show the steps and the final dilutions for the tubes as a fraction.

TRUE OR FALSE __________ 6. Glassware is clean when no water droplets cling to the inner wall of the vessel. __________ 7. When smelling the odor of a chemical substance, fan your hand over the substance toward your nose which should be centimeters away from the substance. __________ 8. An accident as simple as breaking a beaker containing distilled water in the sink does not need to be reported to the laboratory instructor. __________ 9. Students should turn off cell phones, iPads, and other electronic devices during the laboratory class. __________ 10. It is a good laboratory protocol to call other students’ attention when they do not practice good laboratory safety procedures.

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.

What volume (in mL) of 0.0887 M MgF2 solution is needed to make 275.0 mL of 0.0224 M MgF2 solution? McVc=MdVd A.10.9 mL B.91.8 mL C.14.4 mL D.72.3 mL E.69.4 mL

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

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.

What is the main purpose of recrystallisation? A. Chemists recrystallise solids when they want to change big crystals into small crystals. B. Chemists recrystallise solids that are contaminated with impurities. If done properly, the solid will then recrystallise in a purer form. C. Chemists recrystallise solids when they want to change small crystals into big crystals.

please highlight the correct answer

2. Prepare an ice bath in a foam cup with ice and table salt. Place the cup in a beaker to give it more stability. The ice bath should be deep enough so that it is above the level of the water in the test tube but well below the top. Take care not to let any of the salt or ice get into the sample of distilled water.       * What is the predicted freezing point of water?       * Why do you think you need to put salt in the ice bath?

Part 1 Research the following 2 things about water treatment (NOT WASTEWATER). For each, provide the URL of the webpage where you found the information. Try to use Wikipedia, government websites, university/college websites. Use your own words and make sure you understand the chemistry you are explaining. Answer in full sentences. You may attach a Google Doc or a photo of hand-written work to this assignment. Submit only one file. 1. One common chemical contaminant that is removed from water during water treatment. How is it removed and why? Include chemical formulae and chemical reactions. 2. One chemical that is added to water during water treatment. How is it added to water and why? Include chemical formulae and chemical reactions. Read the attached rubric before you begin. This will be used to evaluate your work Part2 An unknown compound is found during a police investigation. -it is a blue solid at room temperature -it dissolves in water -it does not melt when heated to…

All of the work for this question has been done. The Professor asked an additional question that I am struggling with. The question is for part 3, “Why is there no nitrogen in the media?” Can you please explain? Thank you

Based off information from the attachment, please help with #13 on second attachment

Just answer the 4th item. The substances are acetone and alcohol.

An impure sample contains 1.01 g of impurities and 4.92 g of benzoic acid.  The impure sample is dissolved in water, then heated.  The solution is then cooled.  How many grams of benzoic acid will recrystallize when the solution has cooled? Include the unit and two decimal places in your answer. The solubilities of the impurity and benzoic acid in hot water are found as an item in the Recrystallization Experiment folder.   Solubility Data for Report Questions 10  Compound Cold Water solubility Hot Water Solubility Benzoic acid 0.42 g per 100 mL of water 5.79 g per 100 mL of water Impurity 0.61 g per 100 mL of water 4.62 g per 100 mL of water

To make 5.00 L of a fruit punch that contains 10.0% v/v ethanol, how much 95.0% v/v ethanol must bemixed with how much fruit juice?a. 1.90 Lb. 48.0 mLc. 526 mLd. 190 mL