Ch15 Case study

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, pentane, acetone, and tetrahydrofuran. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density - 3 1.6 g·cm carbon tetrachloride diethylamine - 3 0.71 g·cm pentane 3 0.63 g cm 3 0.79 g cm acetone tetrahydrofuran - 3 0.89 g cm Next, the chemist measures the volume of the unknown liquid as 1.427 L and the mass of the unknown liquid as 894. g. Calculate the density of the liquid. Round 3 your answer to 3 significant digits. |lg.cm Given the data above, is it possible to identify the liquid? yes no carbon tetrachloride diethylamine If it is possible to identify the liquid, do so. pentane acetone tetrahydrofuran

Provide a table with molecular weights, boiling points, and density values for the starting material and product. Please also list any hazards of these two compounds based on their SDS forms Material • Balances • Beaker- 50 mL • Boiling beads • Clamps • Filter paper- 11 cm • Funnel • Graduated cylinder- 10 mL and 25 mL • Round Bottom flask (50 mL) • Rubber stopper • Separatory funnel (125 mL) • Stir hot plate with aluminum heating bath and temperature controller • Test tube- 2 (12x75mm) • Thermometer (-10 ◦C -200◦C) Chemicals and Reagents • 2% Silver nitrate (AgNO3) in ethanol • Saturated NaHCO3 soln. • HCl [12M] • Saturated NaCl soln. • 2-methyl-2-propanol • Sodium sulfate, Na2SO4

1. What are fibers and where are they found? How could forensic scientists use fibers to solve a crime?   2. Define the word probative. What is the probative value of a fiber in a forensic investigation?     3. Describe steps you would take from collecting a fiber(s) at a crime scene to performing an analysis to determine its identity.     4.  Which of the 6 fiber types you observed are natural? Which are man-made?     5.  Are fibers classified or individualized? Why?

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of chloroform, diethylamine, ethanolamine, acetone, and pentane.   The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:

What is the purpose of the chemical fume hood? storage for glassware provide a safe place to work with chemical that produce harmful vapors O long term storage of hazardous chemicals O remove harmful vapors created at the lab benches hp

CI Br CI CH3 agua 50°C ácido acético 25°C CH3 SNa DMSO

goformative.com/formatives/60956ddfa1f0d8995bbe3bb2 d G Google O Hudl S Football Pics A BIM - 1st A Art 1- 2nd A WoHistory 4th A Alg2 - 5th A English - 6th A Chem - 8th 8 9. 10 1 gram will float on the surface. 7 A teacher has a bottle of 6.0 M hydrochloric acid. She wants to make 3.0 L of 3.0 M HCI for her chemistry classes. How much of the 6.0 M HCl will she need to use? SHOW YOUR WORK 10 Show Your Work 1800 mL 1500 mL M1V1=M2V2 800 mL 500 mL What is the molarity of a solution containing 15.0 g of sodium hydroxide dissolved in 1.00 L of solution? Mc mass of NaOH is 40.0 grams/mole. SHOW YOUR WORK 8. 10 MAY CC

Synthetic materials can be used by humans for many daily activities. These are often made from natural resources. Choose all of the items from the list that are synthetic materials made from natural resources. nylon cotton Kevlar vests sucrose sucralose plastic Matter and Its lnteractions 53°F Sunny ere to search %23

Calculate the cost per individual molecule of your pain reliever. Acetaminophen has the chemical formula C8H9NO2. Ibuprofen has the chemical formula C13H18O2. Paracetamol has the chemical formula C8H9NO2.

Dipping into health When blood pressure is measured over a 24-hour period, this is referred to as ambulatory blood pressure monitoring, three patterns arise. Here are samples of three different individual. Let's call them Dick (1), Tom (2) and Harry (3). 1 2 3 Patient's Paticnt's BP BP Palicet's Upper limit Upper limit 12 Upper lim 124 120 Lower limit Lower Lower limit Time (houn after wakening) Time (hours after awakening) Time (hours after awakenin SYSTOLIC BP (mm Hg)

1) Despite the radical increase in the use of plastics over the last few decades, the mass of plastics at landfills stayed pretty much the same. Which statement explains this contradicting phenomenon? a) The mass of plastic at landfills has not changed because there are less plastic products on the market. b) The mass of plastic at landfills has not changed because the population is increasing. c) The mass of plastic at landfills has not changed because of light weighting, which reduces the mass of plastic in a container.

Concentration (mg/L)     Ca Mg K Na Al   50.712 68.592 9.357 11.069 12.893 Calculate the CEC for individual soil components and the total CEC for the soil. Place your    values in Table 1 below. Table 1. Ca2+ Mg2+ K+ Na+ Al3+ Total Concentration (mg/L)           -------- CEC cmol(+)/kg

Calculate the mass and volume (mL) of 5.0 mmol triethylsilane Mw: 116.28 g/mol Density: 0.728 g/mL

Unit 3-Two slides 11. Create a question that involves your compound and the formula m= n.M. Solve the question and show all of your work. wwwww 12. Create a question that involves your compound and the formula n = N/NA. Solve the question and show all of your work. TE

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, ethanolamine, pentane, tetrahydrofuran, and dimethyl sulfoxide.   The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:

H30* `NH3 i) type

1. Differentiate between thermoplastic and thermosetting polymers.