Press STOP when the thermograph stabilizes 20. Save that shizzzznit 21. Press DISPLAY to clear previous scan 22. Repeat 11-19 for a second trial | Trial One | Trial Two | Mass of cold water | | | Initial temperature of cold water | | | Mass of hot water | | | Initial temperature of hot water | | | Final Temperature | | | File Name | | | Part B 1. Nest two Styrofoam cups within one another 2.
DATE: 10/2/2012 LAB 3 – PHYSICAL & CHEMICAL PROPERTIES *Adapted from LabPaq Purpose: To determine whether certain changes in matter are chemical or physical, and to describe the changes in detail using observational skills Observations and Experimental Data: Substance: Mg Color: Silver Odor: Slighty Effect of Heat: Particles moved, bubbles flowing up to top Solub. or Reaction w/cold H2O: No reaction Solub. or Reaction w/hot H2O: Bubbles produced from the gas Litmus test: Red turned blue and blue had no change Dilute HCl: Sizzle, steams, heat output Dilute NaOH: Gas was formed. Substance: Cu Color: Redish Brown Odor: None Effect of Heat: Became darker, almost purple like. Solub.
12. Place a paper towel over the drain, pour the content of the well plate, throw the paper towel and rinse the well plate. DATA, OBSERVATIONS, AND CALCULATIONS: Data Table: Oxidation - Reduction | | Reactions | Mg in Na2SO4 | Bubbles | Zn in MgSO4 | Small bubbles | Pb in Zn(NO3)2 | Dark lead changed into lighter color | Pb in FeCl3 | Changed the lead into slight green yellow | Fe in CuSO4 | Changed the iron into orange color | Note: I added more than 10 drops to make sure that the pieces are well covered. QUESTIONS: A. Based on your observations make an activity series of the metals used.
How Temperature Can Affect The Rate Of Reaction Introduction The rate of reaction for a product in a particular reaction is intuitively referred to as how fast or slow a reaction takes place. The rate is a measure of a change that happens over a single unit time. In other words, the unit time is most often a second, a minute or even an hour. There are four factors that change the rates of reactions. (1) Temperature.
Describe the earliest alcohol thermometers. The alcohol thermometers were used because alcohol was lighter then mercury, and expands much more with heat. These Florentine thermometers were usually several meters high, and wound into spirals. The problem was a lack of a universal temperature scale. 7.
Acid test= solid + 3M Acetic acid cloudy + 6 ZnO ZnO + Heat yellow Zn Cooled White + ZnCO3 + heat yellow solid. Yellow solid cooled white solid + QUANTITATIVE DATA AND CALUCATIONS Desired Results Calculations Temperature of Water Bath 22.8oC Vapor Pressure (as
Objective: The objective of the first lab is to use the graph of Pressure versus Temperature to estimate the value of Absolute Zero. Based on the Gay-Lussac’s Law, pressure is proportional to temperature; we are able to find the Absolute Zero when the pressure reaches zero. Conclusion: Our experimental result is -285.40 C. It means when pressure reaches zero, the temperature should reach -273.15 C, which is the value of Absolute Zero. Our experimental Absolute Zero value is fairly close to the accepted value, and the percentage error is 4.48%. One of the major sources of error in this experiment is that the volume of metal ball will rise while the surrounding water’s temperature rise.
25 cm3 of a solution of sodium hydroxide reacts with 15 cm3 of 0.1 mol/dm3 HCl. What is the molar concentration of the sodium hydroxide solution? 4. Succinic acid has the formula (CH2)n(COOH)2 and reacts with dilute sodium hydroxide as follows: (CH2)n(COOH)2 + 2NaOH → (CH2)n(COONa)2 + 2H2O 2.0 g of succinic acid were dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 18.4 cm3 was required to neutralise 25 cm3 of 0.1 moldm-3 NaOH.
In this experiment, the salicylic acid is insoluble in cold water and can be collected by vacuum filtration. Procedure As the lab, synthesis of salicylic acid, had done, micro-scale was used. To begin, 3.5mL of water was poured into a 10 mL round-bottomed flask. And 0.48 g of sodium hydroxide was added to the flask. After the solid was dissolved, 230mg of methyl salicylate was added using a graduated pipet to the NaOH solution.