Observing Reactions of Sulfuric Acid free essay sample

Assessment task 3 oral presentation summary Description of the experiment * Aim:To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent. Equipment: * 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper, zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders Steps: A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with sandpaper to remove oxide coating. . Add a piece of each metal to a separate test tube. 3. Add 5mL of concentrated sulfuric acid to each test tube. 4. Record the observations. 5. Repeat the experiment with 2mol/L sulfuric acid. B: Sulfuric acid as dehydrating agent 1. Place 1g of sugar (sucrose) and a wooden ice-cream stick into separate test tube. 2. Add 1-2mL of concentrated sulfuric acid to each test tube. 3. Record the observations. 4. Repeat the experiment with 2mol/L sulfuric a cid Risk assessment * Conc. We will write a custom essay sample on Observing Reactions of Sulfuric Acid or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page sulfuric acid is highly corrosive * If conc. Sulfuric acid is spilt, do not add water * Hydrogen sulfide gas Results | Observations| | Conc. Sulfuric acid| 2 mol/L sulfuric acid| Copper| No observable change| No observable change| Zinc| No observable change| No observable change| Iron| * Exothermic reaction * Bubbling gas| No observable change| Sugar| * Exothermic reaction * Black solid is produced and pushed out from the test tube * Gas with rotten egg smell is released| No observable change| Wood| * Black layer is formed on the wood| No observable change| Validity and reliability Experiment was not repeated * Low reliability * Results not consistent with the known theory * Invalid * Require to eliminate experimental errors Analysis of the results HSC syllabus dot-points: * Students learn to: Describe, using examples, the reactions of sulfuric acid acting as: * an oxidising agent * a dehydrating agent * Students: * Perform first-hand investigations to observe the reactions of sulfuric acid acting as: * an oxidising agent * a d ehydrating agent Conc. sulfuric acid: Reaction with metal – as an oxidising agent: Fes+2H2SO4lFeSO4(aq)+SO2(g)+2H2O(l) * Bubbling gas * FesFe2+(aq)+2e- * 2H+(aq)+2HSO4-(aq)+2e-SO2g+2H2O(l)+SO42-(aq) * Hydrogen sulfate ion act as oxidising agent * Some metals such as zinc did not react * Oxide layer * Heat * Leave overnight 2mol/L sulfuric acid: * Zns+H2SO4aqZnSO4aq+H2g * Zns+2H+aqZn2+aq+H2(g) * Oxidant is hydrogen ion Conc. sulfuric acid: Reaction with sugar and wood – as a dehydrating agent: * C12H22O11sH2SO4Â  12Cs+11H20(l) * Hydrogen sulfide gas 2mol/L sulfuric acid: * Sugar and wood do not react with dilute sulfuric acid

How to Choose Different Persuasive Essay Topics

How to Choose Different Persuasive Essay TopicsWriting a persuasive essay has many different persuasion topic choices to choose from. The best way to become more confident in writing persuasive essays is to familiarize yourself with the different persuasion topics, as they all serve very similar roles in your speech.Persuasive topics have been used for many years by many professional speakers and writers. If you are willing to look for the underlying reasons behind the different persuasive essay topics, then you can expect the presentation of the speech to be more powerful. However, in order to effectively give a persuasive essay topic, you need to do some research into the topic before you write.It is important that you understand how persuasive essay topics work before you write. A strong argument is often the basis for persuading an audience; when you are giving your speech, you need to create a strong and compelling argument so that you can convince the audience that you are the best person to help them.When you first start learning about persuasive essay topics, you will find that there are many different ways to give a persuasive essay topic. One popular approach is by using a topic that is related to your audience. The key to helping your audience become more convinced is to connect with their passions and interests, and to make a connection to what you have to offer. You can use what they love or have experienced as a resource for your talk.Another approach to persuading audiences with persuasive essay topics is to use a topical theme. For example, if you are giving a speech on food, you could explore a particular food item, like chocolate, or another element of the food category. If you use a topical theme, you can easily connect with the audience on a personal level. After you write your persuasive essay topic, you can easily insert keywords to help people remember your speech.Before you begin your research on persuasive essay topics, you will want to realize that the more content you can include, the more powerful your essay will be. The content of the topic should also be specific to your audience and should take into account what they would love to hear. You can also use different ways to describe the topic so that you can get the most out of it. For example, you may say something like 'because X' instead of just saying 'because' and to give the focus of your audience to something that is useful.By combining topics and finding ways to make sure you can make a compelling persuasive essay topic, you can significantly boost your speech. It is important that you research the different persuasive essay topics before you begin writing. Writing an effective persuasive essay is difficult, but not impossible. With the right resources, you can easily improve your speech to have a greater impact.