Lab 5_ Melting Point

please highlight the correct answer

Could you help me with question 2, please?

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.

Mixtures and Pure Substances Lab Data Sheet Discussion Questions: In the space provided for each question, type your response. Be sure to write complete sentences for your responses as well as use proper grammar and punctuation. Submit your lab data sheet as docx or pdf file in Canvas. 1.Classify the salt and pepper mixture. Click or tap here to enter text. 2.Why did you add water to the salt and pepper mixture? Click or tap here to enter text. 3.Classify the types of mixtures formed from the salt, pepper and water. Click or tap here to enter text. 4.What is the physical method used to separate the salt water from the pepper? Click or tap here to enter text. 5.What is the physical method used to separate the salt from water? Click or tap here to enter text. 6.What physical property is different in salt and water? Click or tap here to enter text. 7.What are the types of pure substances present in the salt solution? Click or tap here to enter text.

Please answer question and give a brief explination why

Name the following Fe(NO3)2

Based on this. What was the percentage error in the percentage of water in the sample, compared to pure MgSO4•7H2O?

• BE SURE TO ANSWER AND LABEL ALL PARTS OF EACH QUESTION. • Show all your work. • If you do the work in your head, explain in writing how you did the work. A scientist has three unlabeled samples of pure metals. He wants to determine the identity of each metal. a. Identify which one of the following properties the scientist should use to determine the identity of the pure metal in each sample: color, melting point, mass, or volume. b. Explain why the property you identified in part (a) can be used to determine the identity of the pure metal in each sample. The scientist cuts each of the samples of pure metal into two smaller pieces. c. Is the property that is used to determine the identity of the metal affected when each sample is cut into two pieces? Explain your answer The scientist can also use density to determine the identity of the pure metal in each sample. d. Describe how the scientist can determine the density of the pure metal in each sample.

Methods of Analysis Test #1: Polarity, or Effect of a charged rod on a stream of liquid: This test was used to determine the relative polarity of the unknown liquid. The liquid was allowed to run out of a buret and a charged rod was brought up next to the stream. The observations were reported as to whether or not the stream of liquid responded to the charged rod and to what degree. Try this at home with water and a plastic spoon. Rub the plastic spoon against a sweater and move it close to a small stream of water running out of your faucet! Test #2: Volatility, or Rate of Evaporation: A thermometer probe was wrapped with a strip of filter paper. This assembly was soaked in one of the liquids for one minute. The probe was removed, and the temperature change was monitored as the liquid evaporated. The results are given in Graph 1 below. (See Graph)   Graph 1: The curves generated of the change in temperature over time for the substances acetone, hydrogen monoxide, ethylene glycol,…

Supply the missing information in the table. (Given in Blue). Answers in scientific notation should be in this sample format >>> 1.0 x 10-14

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

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.

I'm resending this question because the image on the last one was blurry. I wrote the prompt and steps and helpful conversions to figuring out the real world problem on my scratch paper, how do I solve for this problem?

The solvent moves 3 cm in about 10 minutes. Why shouldn't the experiment be stopped at that time instead of waiting 75 minutes for the solvent to move 10 cm? Question 3 options:   More time increases the concentration of mixture components.   More time allows for better separation of components in a mixture.   More time decreases the concentration of mixture components.   Instructors don't like students to be finishing their labs too quickly.

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

Explain the importance of using a thermometer in the simple distillation setup.

Part A: The graphic shows an organic molecule and highlights a functional group that is bonded to it. This functional group is an example of ______ group. Part B: select which Characteristic this functional group impacts on the molecule. A. Forms disulfide bonds B. Nonpolar

Gravimetric analysis is a quantitative method that involves measurement of volume of a solution of known concentration which is used to determine the concentration of the analyte.  True  False   A good example of complete analysis is the determination of %C, %H and %O in an unknown organic sample.  True  False

Water softening is necessary to prevent clog in plumbing and prevent formation of scum in bathrooms and sinks. O True O False

Discuss common sample preservation methods or storage conditions that would ensure sample stability during transportation and in the laboratory.