Copy of Project 5 Rock Candy Report

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?

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

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

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

Which of these will NOT dissolve in water?    a.table salt b.sugar c.vinegar d.bacon fat

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.

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

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?

someone please help righteously

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

_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

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.

5. Which tablet size and the liquid combination resulted in the fastest dissolution times? A. crushed, room temperature water B. crushed, hot water C. crushed, room temperature vinegar D. broken, hot water E. broken, room temperature vinegar 6. What is the relationship between particle size and the time it takes for the tablet to dissolve? A. direct proportion B. inverse proportion C. combined proportion D. joint proportion 7. Using the activity as a model, how does mechanical weathering (breaking or crushing) contribute to chemical weathering (dissolution)? A. Increases size of particles B. Decreases dissolution time C. Increases surface area D. Both A and B E. Both B and C

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.

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

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?

a. Convert 15 ppb to units of percent by mass (density is 1.00 g/mL) b. Protective layer can form from the precipitation reaction of lead(II) with carbonate to form lead(II) carbonate.  Write a balanced chemical equation for this reaction Please show work when solving the questions. Thanks!

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?

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?

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.…

Which one of the following cannot be used as a deodorant? 2. a. CaCo3 b. Zn(C17H35CO0)2 C. Al(OH)3 d. Zno Which one of the following is not a suitable disinfectant against corona virus? a. Ethanol solution b. NaAl(OH)4 solution c. Phenol solution d. NaCIO solution Which one of the following phrases is not true? a. Acidic media do not affect soapless soaps b. Synthetic detergents are stronger than soaps C. Synthetic detergents cannot be used in hard water d. Alkylbentene sulphonates are synthetic detergents Dettol is: a. Antifertility. b. Antis ptic. C. Antipyretic. d. Antibiotic. Which one of the following is not an antacid? a. Mg(OH)2 b. CH3COONa c. Milk d. NaHCO3

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…

Compare the purity of the three aspirin samples with that of the reference sample (0.15 % salicylic acid).  Which sample is the least pure?  Which sample is the purest?  Explain how you made your choices

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.

The United States Environmental Protection Agency (EPA) has set the Maximum Contaminant Level Goal (MCLG) for the chemical cyanide at 200 ppb based on the best available science aimed at preventing health problems like nerve damage or thyroid problems. What is the MCLG reported in parts per million? Select one: a. 200 ppm b. 2000 ppm c. 0.200 ppm d. 0.0200 ppm