Litmus test: Red turned blue and blue had no reaction Dilute HCl: Fizzes and substance turns yellowish while bubbling the back to white. Dilute NaOH: Dissolves and substance became a bit thick Substance: CuCO3 Color: Green Odor: Yes Effect of Heat: Turned into black powder Solub. or Reaction w/cold H2O: No reaction. Solub. or Reaction w/hot H2O: No reaction Litmus test: No change on blue or red.
CHM130 Lab 1 SAFETY, EQUIPMENT , AND THE SCIENTIFIC METHOD Name: Mengqi Li 1. A student enters their laboratory setting and is getting ready to set up. What preparations should be made? (16 points) Answer: 1. Immediately disinfect bench tops with a 10% bleach solution before the student begins lab.
An aqueous solution of ammonium sulfate is allowed to react with an aqueous solution of lead(II) nitrate. Identify the solid in the balanced equation. A) (NH4 )2 SO4 B) Pb(NO3 )2 C) PbSO4 D) NH4 NO3 E) There is no solid formed when the two solutions are mixed. ____ 11. An aqueous solution of sodium carbonate is reacted with an aqueous solution of calcium chloride.
If contact was liquefied gas thaw the frozen parts with lukewarm water. If it was a burn cool infected area with cold water but do not remove clothing adhering to the skin. 1005- Ammonia; toxic and corrosive gas. Isolate any spill at least 100 meters in all directions. first aide move victim to fresh air, administer o2, DO NOT use
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
3) Write equations to indicate what you consider to have happened in each case in which there was precipitate formed. Use ions to represent the species in the reacting solutions, but for those products that were precipitates write a formula for the compound. Place (aq) after those species in solution and (s) after the precipitates. Be sure to write the equations so that both atoms and charge are conserved. For example: Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) ( AgCl(s) + Na+(aq) + NO3-(aq) 4) Rewrite the equations, leaving out the ions not involved in the reaction (spectators).
Experiment and Observation: Please note that this procedure was adapted from the “Anions, Cations, and Ionic Reactions” LabPaq Lab manual (Hands-On Labs Version 42-0304-82-00-01, 2015) Please reference this manual for further information on the lab experiments. The first experiment was to perform a qualitative anion test. This was done by observation of chemical reactions and recording the results in Data Table 1. Using the information from the reactions we were able to identify unknown substances and recorded the results in Data Table 1. Data Table 1: Anion Confirmation Tests Chemical | Anion | Addition of AgNO3 | Addition of HCl | NaBr | Bromide | Cloudy white thin solution | Clear with sedimentation | Na2CO3 | Carbonate | Clear with white sedimentation | Bubbles, sedimentation combined to one formation | NaCl | Chloride | Milky white, white sedimentation | No visible change | Nal | Iodide | Pale green cloudy, sedimentation | Sedimentation dispersed to smaller pieces, solution clears in color | Na2SO4 | Sulfate | No visible changes noted | Milky white | Na2S | Sulfide | Clear with amber sedimentation | No visible Change noted | Unknown #103 | CarbonateNa2CO3 | Cloudy white thin solution | Bubbles, Sedimentation combined to one
BTEC Applied Science Level 3 Unit 11 – Physiology Of Human Body Systems Part 4 – The Digestive System Task 4 – Use appropriate chemical tests to identify different dietary nutrients P5 Use appropriate chemical tests to identify different dietary nutrients Name:______________________________________________________ Student ID:_______________ Date:____________________ Notes: 1) Plagiarism (i.e. copying, cheating) will result in a fail! 2) When you have completed the task, a. Remove the staple! b. Scan the document c. Save the file in your “My Documents” d. Upload the file into Moodle e. Keep the paper copy filed safely as a backup 3) The deadline for completion is Sunday 24th November 2013.
The precipitate(s) for the above reaction is/are: A) Silver nitrate B) Aluminum bromide C) Silver bromide D) Aluminum nitrate E) There is no precipitate 18 – 37: For each of the two REDOX reactions below, perform the following: A) Balance the following equation and place the final answer in the boxes provided; show all work on the exam pages. B) Identify the oxidizing and reducing reagents. C) Assign the oxidation numbers to the elements in bold on both sides of the equation. D) Identify the oxidation and reduction half-reactions by placing LEO and GER, respectively, above the arrows in each half-reaction. E) NOTE that illegible writing will not be graded.
Eyewash station 9. Location of goggles 5. Fume hood 10. Location of gloves c. Locate and read the evacuation instructions that are posted in your laboratory. Describe how you should evacuate in case of an accident.