Cooling+and+Heating+Curve+Lab+v2

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

You were tasked to check if the liquid sample you have is a substance or a mixture. Which among these tasks is the BEST way to do so? Color comparison Taste comparison Boiling Test Melting Test 1. I. II. IV. C. I, Il and IV only D. II and IV only A. I, II, III, IV B. I, II and III only 2. A liquid has the following properties: one-phase, colorless, boils at varying temperature. Which of the following BEST describes the liquid? A. solution B. substance C. suspension D. heterogeneous mixture Jill has an unopened box of a 2-meter foil labeled as 100% aluminum. Jill takes just a thumb-sized piece of the aluminum foil. Which of the following statement is TRUE about the piece of aluminum foil that Jill took compared with the rest that was left in the box? 3. A. Its mass and melting behavior are different. B. Its mass and melting behavior are the same. C. The mass is different, but the melting behavior is the same. D. The mass is the same, but the melting behavior is different. 4. Which of…

• Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·

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…

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

Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?

Please complete answers than rating helpful other wise un helpful 6 and 7

Home Tools Lab Experiment #... x ... +) 玩, 1 | 2 97.4% Record your observations following each reaction including changes in color and state of matter. AGNO3 (Ag*) Pb(NO3)2 (Pb²*) Ca(NO3)2 (Ca²+) а e i NazCO3 Light orange solid white, cloudy solid white, cloudy, solid (СО2) b NaOH f dark brown solid stay clear, liquid white, cloudy solid (OH) g k NazSO4 stay clear, liquid white, cloudy, solid white, cloudy, solid (SO?) d NaCl 1 white, cloudy solid white, cloudy solid stay clear, liquid (CF) .... Remember to complete and submit this table to your instructor before the end of the class session.

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 60. What is/are the purpose/s of heating sodium carbonate in 270°C for one hour before using it in the standardization of hydrochloric acid? 1. To remove carbon dioxide that is generated during the neutralization reaction II. To remove moisture III. To convert sodium barbonate to sodium bicarbonate a. I, II and III C. I only b. II only d. II and III 61. The process by which the exact concentration of a solution is determined: a. Dissolution C. Standardization Titration b. Neutralization d. 62. The function of Quality Control include the following, except: a. C. Analytical control Planning b. Auditing d. Inspection control

Time (min The investigator used one of the following substances in this experiment. Melting and Boiling Points of Four Substances Melting Point Boiling Point (°C) Substance (°C) 1 20 100 40 140 3. 70 140 80 160 Which of these substances was used in this phase change investigation? A. Substance 2 B. Substance 4 C. Substance 3 O D. Substance 1

This question has multiple parts. Work all the parts to get the most points. Use the References to access important values if needed for this question. 18 16 14 12 10 8 6 4. Choose the correct relationship for the plot shown above. O a direct proportion O an inverse proportion O linear with a positive slope and nonzero y-intercept O linear with a negative slope and nonzero y-intercept Submit Cengage Learning | Cengage Technical Support MacBook Air DII E5 F6 EZ FA F9 F10 F 2$ & * ) 4 5 6 7 8 * 00

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

Concentration (mg/ml) Time (min) 8.5 0.5 6.8 5.4 1.5 4.0 2 3.2 2.5 2.5 3 What will be the slope of the line using the given first and second values? What will be the y-intercept, still using the given first and second values? Completely state the equation of the line. nlcot olN5

In the titration of NaOH with vinegar, a student overshot the endpoint (i.e. added too much NaOH solution). How will this affect the calculate percent acetic acid in the vinegar? percent will be too high percent will be too low no effect on the percent ding of this buret? 21 Click Save and Submit to save and submit, Click Save All Answers to save all answers. Save All Answers Cle 80 000 000 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 # &. %24 20

Catra wanted to determine the concentration of copper(II) chloride at an unknown concentration .She began by trying to determine the value of epsilon (ε) using beers law for copper(II) chloride. Catra remembered in lab when they wanted to solve for epsilon they would test the absorbance for three different concentrations of a known solution and then graph it. Catra got frustrated and asked Shera what to do next to determine epsilon. What should Shera tell Catra?

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)

A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table.  Solid Sample Melting Point (oC)  Time Elapsed (min) Table Sugar (sucrose) 186 18 Table Salt (sodium chloride) 500 (not observed) 30  Paraffin Wax 37 4  Vegetable Lard 50 >5 Using the information contained in the table, what is the BEST explanation for the results?A    The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B    The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C    The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…

Activity 3 Direction: Match the following processes with their descriptions. 1. Storage a. Some chemicals are added to the water that will make the dirt and some 2. Sedimentation dissolved particles to stick together 3. Filtration b. Water is placed here before it is transported to your house 4. Disinfection 5. Coagulation c. Flocs start to get really heavy and sink 6. Aeration to the bottom of the tank where they can be removed d. Water flows slowly through this section made up of layers of sand, gravel, and charcoal e. Water and air in close contact in order to remove dissolved gases and metals f. Chlorine is added

All changes save 7. When two solutions are mixed, a color change occurs. The data tables show the time between mixing and the color change for two sets of conditions. For Condition One, the solution concentrations were constant and temperature varied. For Condition Two, the temperature was constant and concentrations varied. Condition One: Concentration Time for Temperature (°C) Sample Color to Change 1 10° 36 sec 22° 14 sec Condition Two: Temperature Time for Concentration Sample Color to % Change 1. 100% 15 sec 2. 50% 24 sec Which of these statements is true according to the data? O The reaction rate is greater at 22°C than at 10°C. O Reducing the temperature increases the rate of the reaction. The reaction is affected by changes in temperature not by changes in concentration. O Decreasing the concentration increases the reaction rate. PREVIOUS 17 of 25 NEXT SAVE & EXIT

PRODUCT REFRACTOMETER %SUGAR CONCENTRATION FRUIT COCKTAIL   10oB     using refractometer, how to solve the % of sugar solution?  (please indicate the solution and formula)

Hi! Can someone please help me with these 2 questions? Thanks so much!!

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.

Why is NaOH(s) to be taken out and weighed only when you are ready to make measurements? Group of answer choices NaOH does not need special treatment. NaOH reacts violently so is prepared last. NaOH is hygroscopic NaOH burns holes in the weighing paper.

A vehicle's cooling system is being discussed. Technician A states that engine coolant should not be mixed at a ratio higher than 65% coolant and 35% water. Technician B states that a 50% coolant and 50% water is adequate for most climates. Who is correct? Select one: a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor B

Routine Chemical Tests for Urine - Word Table Tools Decy Joy Garriel Table Design O Tell me what you want to do 2 Share File Home Insert Draw Design Layout References Mailings Review View Help Layout X Cut P Find Calibri (Body) 12 A A Aa v AaBbCcD AaBbCcDc AaBbCcDc AaBbC AaBbCcC AaBbC AaBbCcD EE Copy ab. Replace Paste BIU v abe X, x A v aly - A - I Normal No Spacing I No Spac. Heading 1 Heading 2 Heading 3 Heading 4 A Select Format Painter Clipboard Font Paragraph Styles Editing COLLEGE OF HEALTH SCIENCES RESULTS AND OBSERVA TIONS: PARTI: BENEDICTS TEST FOR REDUCING SUGARS 田 TUBE PATIENT COLOR RESULT and NO. Before: Blue-green OBSERVATION WHITE PRECIPITATE: 1 Normal Patient 1 After: Greenish brown 2 Normal Patient 2 Before: Blue LIGHT GREEN After: Green PRECIPITA TE: 3 WHILTE AND YELLOW Pathologic Patient 1 Before: Blue PRECIPITATE: After: Green BRICK RED Before: Blue-green After: Brick Red Pathologic Patient 2 PRECIPITATE: Generalization: Page 5 of 8 947 words English (Philippines) K…

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HELP #8 . The second image shows what I put and I got it wrong.

Current Attempt in Progress From the curves shown in Animated Figure and using the following Equation, determine the rate of recrystallization for pure copper at the several temperatures. Make a plot of In(rate) versus the reciprocal of temperature (in K-1). (a) Determine the activation energy for this recrystallization process. (See Section FACTORS THAT INFLUENCE DIFFUSION.) (b) By extrapolation, estimate the length of time required for 50% recrystallization at room temperature, 20°C (293 K). (a) i kJ/mol (b) i days

C. Identify the method for the separation of the following mixtures: 1. Kerosene in water 2. Iron fillings and wood shavings 3. Water and alcohol 4. Salt solution 5. Powdered chalk in water 6. Soil with gasoline 7. Crude oil processing to separate diesel from gasoline 8. Blood components 9. Sand and water 10, oil and water

SERIAL DILUTION: PROBLEM SOLVING.   Set up five (5) tubes on the test tube rack and label them 1-5. Place 0.9 ml of saline to tube #1 and 0.5 ml of saline to tubes # 2-5. Add 0.1 ml of patient's serum to tube #1, mix and transfer 0.5 ml of the mixture to tube # 2. Then, mix and transfer 0.5 ml of the mixture to tube # 3. Mix and continue dilutions through tube # 5. Discard 0.5 ml from tube # 5. Finally, add 0.5 ml of the reagent to each tube # 1-5. Compute for the initial dilution of tube #1 and final dilution of tube #5. Show your computation and encircle your final answer.