Results: Zinc Metal - Iodine - Iodide + Triodide + Zinc Ion + Focus Questions: 1. Is there a way to put energy into Zinc Iodide in order to regain the elements, zinc and iodine? If there is a way, how does it happen? Yes, this can be done through electrolysis using a battery and exposed wire tips. Take sample of Zinc Iodide and dissolve in solution.
The purpose of the lab was to determine which reactant was the limiting reactant, and to see how much of the other reactant was used. The true molarity of a compound can be defined as the amount of moles per liter of that substance. The equation of this single displacement chemical reaction done during this lab is 2Al(s) + 3CuCl(aq) → 3Cu (s) + 2AlCl2 (aq). In the reaction, the solid Aluminum replaces the Copper in Copper (II) Chloride to produce solid copper, and Aluminum Chloride. In order to find which reactant is the limiting reactant, an equation based on the molarity of the Copper (II) Chloride may be used, or the products of the reaction may be observed.
| Centrifuge: used to isolate the solid from the solution | . Focus Questions: When acidified water is not used in the zinc and iodine synthesis, zinc hydroxide is formed. How can it be identified based on the amphoteric nature. When zinc and iodine react without the presence of acetic acid in the water, zinc hydroxide forms. This is evident because the substance tested positive for both the acid test and the base test for zinc hydroxide.
LB+:There should have been bacterial growth but no blue colonies because there was an anti-biotic acting against it. LB-: Nothing should have happened because there was no bacteria and plasmid given. 3. One of the plates should have no growth and that was the LB- plate. This happened because the plate was given no bacteria or anything to start growth.
In this lab, iron had to replace copper in a copper sulfate solution in a single replacement reaction. On this lab our objective was to find out what copper and iron we were using. We had to find if we were using iron +2 or iron+3 and copper +1 or copper +2. There were 4 possible reactions: the first one could have iron +2 and copper +1. The second one could have iron +2 and copper +2.
Liquids? 3. Aqueous solutions (when the covalent compounds are dissolved in water)? Covalent compounds cannot conduct electricity as liquid or aqueous solution because ions are needed to conduct electricity in water and there are no ions in a covalent compound. They cannot conduct electricity as a solid because the normal don’t transfer electrons unless they react with something else.
Lesson written by Carolina Sylvestri Experiment: Reaction Between Ions in Aqueous Solutions The Monster Mash Background: Ionic solids dissolve in water to form aqueous solutions which conduct electricity. These solutions contain both positive and negative ions in such numbers that their net electric charge is zero. In this experiment, you will mix various ionic solutions, two at a time, to determine which combinations form precipitates. Knowing which ions are present makes it possible to deduce which of the possible ion combinations are responsible for the precipitates. From your data table, it will then be possible to generate a solubility table.
- signs of chemical change = changes the shape and color, creates a gas, distributes heat, Etc. - Chemical Change= Substance is formed into a completely new substance 2. Hypothesis: If the copper is being tested in these metals ( Copper, Magnesium and cupric chloride) then it would be the least reactive out of magnesium and zinc because it is the lowest among the three on the activity series. 3. Experimental Design: - Independent Variable: different types of metals: magnesium, zinc and Copper - Dependent Variable: amount of reactants observed for each metal - Control : The Air -Constants: The amount of chemical solutions, the time the metals were in the chemical solutions and size of each metal during the experiment 4.
Each and every time testing urine for metals one must make sure that she/he tests it before injection or administration of any chelation therapy agent. Those individuals that have metal amounts which are normal in their bodies will be removed by chelation therapy and that will result to non-reliable chelation therapy for diagnosis of poisoning
Investigation of the effect of metal ions on enzyme activity Objective: The effect of lead (II) ion and silver ion on the enzyme activity of invertase Introduction: Hypothesis: The activity of the invertase will be inhibited by the heavy metal ions Prediction made from the hypothesis: Biological principle: Heavy metal ions are non-competitive inhibitors. They do not compete with the substrates for the active sites of enzymes. They attach to other parts of the enzyme molecules and cause changes in the structure of the active site. The substrate molecules can no longer bind to the active sites and the rate of enzymatic reaction decreases. Therefore, they prevent the enzyme reactions from taking place.