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Biuret Test
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Reagent’s Composition |
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- 2. Choose an object around you (anything you like). Make two qualitative observations about the object you chose. 3. Give examples of types of quantitative observations. The meltine Pnt of crustalline Sulfur is l15-1I Celsisand 35.9jrams of telde Saltithe chenical neime of which issoedium chloride disralves in of lovgrams of water at 20celcius. 4. Make one quantitative observation about the object you chose earlier. 5. Give an example of a hypothesis you made in real life recently. Remember the definition of hypothesis from our earlier section of work -a hypothesis is a tentative explanation that can be tested, and is usually based on previous observations. For example: My hypothesis is that my kids sleep better when I take them on a walk of at least 15 minutes long each day. reishe takes in more suugar 6. Design an experiment to test YOUR hypothesis. Here's my experiment: This week, I'm going to take my kids on a walk every day for 7 days, and track their sleep. Then, I'm NOT going to…When we need sample preparation for analysis? use your own words to explainwhat is the correct sig figs?
- 1. On the molecular level, what does it mean for a solid sample to be pure? 2. The computed percent recovery was more than 100%. What does this signify, and what should be done about it?2 Fe + Oz →2 FeO 1. The numbers in red boxes are... A. subscripts B. coefficients C. reactants D. products 2. The chemicals in the purple box are... A. subscripts B. coefficients C. reactants D. productsA gas cylinder symbol means explosiveThe tendency when an acid is mixed with base is to be neutralizedCarbonization is heating in the absence of airCoke is made from wood distillation A.) If all 4 statements are trueB.) If 3 of the 4 statements are trueC.) If 2 of the 4 statements are trueD.) If only 1 of the 4 statements is trueE.) If none of the 4 statements is true
- M|OM|O G fil app.101edu.co Maps ouTube F1 80 F3 E D C $ 4 c|o X G d Question 23 of 31 The molecules shown below are Aa F4 R F P₂ % 5 V A F5 T G В B 8 6 MacBook Air F6 B Y H 7 F7 с N 2|GT|G B * 8 J 기 A) Identical molecules B) Stereoisomers C) Constitutional isomers D) Isotopes E) Neither identical nor a type of isomer Done F8 B M W ( 9 G 17 CS UO N E E K F9 O H L F10 U P B > F11 Gra الہا + 11 ☐ ? X command option F13 1Solve correctly please. Should 100% sure of final answer with some explanation of them.B. Density of Liquid 1. Obtain a sample of distilled water (any quantity of your choice) anddetermine its mass and volume. Record your data on table 3 in theexperimental report 2. Calculate the density of the water sample using equation 1. Substance Density (g/mL) Substance Density (g/mL) Aluminum 2.7 Lead 11.3 Brass 8.4 Zinc 7.1 Copper 8.9 Cork 0.26 Tin 7.3 Silver 10.5 Bone 1.80 Rhodium 12.4 Iron 7.9 Platinum 21.45
- 1. Explain both precision and accuracy as they pertain to chemical measurements. 2. Why would you use the method of standard addition to calibrate a measurement instead of a calibration curve?ABCDE A. B. C. D. E. A A B (C) C D B E E 1. Br2, CC14 1. H₂, Lindlar's cat.; 1. Br2, CC14 1. Na, NH3(0); 1. Br2, CC14 Br CH₂CH3 Br H 2. H₂, Lindlar's cat. 2. Br2 2. Na, NH3(1) 2. Br2 2. H₂, Pt + enantiomerParagraph Styles ntroduction: Models are very important for chemists. You cannot see detailed features of a molecule, e vith a microscope. However, you can build a molecule that shows some of the properties that chemists letermined through experimentation. In this investigation, you will use a molecular model kit to assemb nodels of a few molecules. Question: what can you predict about the structures of molecules by building models? Procedure: You will need a molecular model kit to use for your group 2. Complete the table on the back of this note for drawings in procedure steps 3, 4, and 5. 3. In your table, write the name and formula, and draw a Lewis structure of each molecule below. a. hydrogen bonded to hydrogen b. chlorine bonded to chlorine oxygen bonded to two hydrogen atoms carbon bonded to two oxygen atoms C. d. e. nitrogen bonded to three hydrogen atoms f. carbon bonded to four chlorine atoms g. nitrogen bonded to three fluorine atoms a. Look through your textbook, and choose…