0.00512g ZnI2/mL of solution 0.00512g/319.18 g/mol=1.6*10-5 mol 1.6*10-5 mol/(1*10-3L)=0.016M c. 0.00806 moles of ZnI2/500 mL of solution 0.00806mol/(500*10-3)L=0.016M d. 0.0161 moles of ZnI2/L of solution 0.0161mol/1L=0.016M Exercise 4: a. The moles of ZnI2: 0.25M*(250*10-3)L=0.0625mol b. 0.25M*(250*10-3)L=0.0625mol The mass of ZnI2: 0.0625mol*319.18 g/mol=19.95g c. 0.25M*(500*10-3)L=0.125mol 0.125mol*319.18 g/mol=39.9g ZnI2 d. 0.0125mol/0.25M=0.05L Exercise 5: a. 0.125M*(100*10-3)L=0.0125mol b. 0.0625mol/0.125M=0.5L=500mL Calculation for preparing the EDTA solution Exercise 6 a.
Developed TLC plate by placing plate in chamber not contacting filter paper.7. Removed plate from chamber when solvent front was 1 to 2 cm from top of plate.8. marked solvent front with pencil line & set on paper towel to dry.9. Marked position of compounds on plate using a UV lamp10.Calculated Rf values for each spot11. determined results were unsatisfactory to how experiment was supposed to turn out.Part B1.
Question: How can you determine that type of displacement reaction that is occurring? Materials: • 3 test tubes • 3 rubber stoppers • 15 cm of magnesium ribbon • Copper(II) sulfate crystals, fine • Calcium chloride • Sodium carbonate • 30 mL of warm water Safety Precautions: • Wear safety goggles , gloves, and a lab apron • Avoid skin contact with copper (II) sulfate dust and solution • Keep work area clean wipe up any spills and inform your teacher immediately Procedure: • Refer to page 210 and 211 in On Science 10 Observations: Before: • Solid • Blue crystals • Small • Shiny • solid • White • A bit shiny • Large crystals • White • Powdery • Soft After • liquid • The substance formed a bluish-green
MESA DAY CONTEST RULES 2012 - 2013 Model Science – The Human Eye LEVEL: Middle School - Grades 6, 7 and 8 TYPE OF CONTEST: Individual / Team COMPOSITION OF TEAMS: 1 – 2 students per team NUMBER OF TEAMS: 3 teams per Center SPONSOR: Ben Louie, Associate Director, USC MSP Center OVERVIEW: Students will construct an original display and model of a bisected human eye and will answer questions drawn from an assigned list using reading material provided in the MESA Day curriculum. MATERIALS: The following materials will be provided by the students: “items that are not perishable” with which to build the original model RULES: 1. The display/model must be the original work of student(s). Judges may
Solutions Lab 3: Input, Processing, and Output Lab 3.1 –Flowcharts Note to Instructor: Steps 1 – 9 walk students through the process of using Raptor and designing a flowchart. Step 10 requires students to show their completed flowchart. Variable names and statements will vary from student to student. Also, the lab can be completed using a different flowcharting application, such as Visio. If so, the sample solution below will look a little different, but should still have the same fundamental steps.
Methods For this lab, the required materials include a meter stick, a table top, someone to test the experiment on, and another person to carry out the experiment. The experiment began with the subject’s hand rested on a table top, extended slightly over the edge with the thumb and forefinger opposed and slightly separated. The researcher then held a meter stick above the subject’s fingers with the zero mark placed between the gap of the thumb and finger. The subject chose which hand they wanted to test first and continued to use the same hand for 25 trials. The researcher told the subject to grab the stick as soon as possible after it started to descend and let go of the meter stick without any warning.
Physics 201 Section 401 ARCHIMEDES’ PRINCIPLE Jordan Nix Partners: Kelsey Carter and Taylor Pfau Date Performed: November 10, 2014 TA: Andrew Whitley Abstract Table 1 | Mass (g) | Mass Submerged (g) | Mass Apparent (m') (g) | Radius (cm) | Length (cm) | Length Submerged (cm) | Volume (cm3) | Aluminum | 58.50 | | 42.00 | 0.95 | 7.60 | | 21.32 | Wood | 30.50 | 8.85 | 20.00 | 1.15 | 9.89 | 2.90 | 12.05 | Table 2 | Theoretical Density(theo) (g/cm3) | Experimental Density(exp) (g/cm3) | Percent Difference(%) | Aluminum | 2.74 | 3.54 | 29.20 | Wood | 2.54 | 2.90 | 14.17 | Discussion In the first part, a 58.5 g aluminum cylinder was hung from a string attached to a scale and submerged in a graduated cylinder filled with water. The cylinder displaced approximately 17 mLs of water and had an “apparent mass” of 42 g while submerged. Two oppositional forces acted upon the cylinder: gravity drew it downward while buoyant force pushed it towards the water’s surface. Using Archimedes’ Principle that force on a body in a fluid is equal in magnitude to the weight displaced by the fluid, we were able to calculate the experimental density of the aluminum cylinder as 3.54 g/cm3. Measurements of the radius and length of the cylinder provided its volume and theoretical density of 2.74 g/cm^3 which confirmed Archimedes’ Principle.