If energy is absorbed‚ the reaction is called endothermic. Materials: spatula sodium hydroxide pellets (NaOH) 1 Styrofoam cup 1.0 M sodium hydroxide (NaOH) 1 100-mL graduated cylinder 0.5M Hydrochloric acid (HCl) 1 400-mL beaker 1.0 M hydrochloric acid (HCl) 1 50-mL beaker distilled water thermometer centigram balance Procedure: Reaction 1: a. Measure 100mL of distilled water into a plastic-foam cup. Place the cup inside a 400mL beaker for support.
Premium
2.MATERIALS and METHODS 2.1. Nature of Reactants 2.1.1 We placed 3mL of 3 M HCl into each of 3 seperate test tubes. Next we added mossy zinc to the first test tubes‚ Sn granules to the second and Cu filings to the third and compared the rates of evolution of hydrogen gas in each test tube. 2.1.2. We mixed 3mL of 0.02 M KMnO4 and 2mL of 3 M H2SO4 in a test tube and stirred using a glass rod. Next‚ we divided the solution into two. We added 2mL of 0.03 M Na2C2O4 solution to the first half and
Premium Chemical reaction Gas Hydrochloric acid
unfortunate‚ but unknown‚ Canadian soldier struck down in 1917. To minimize the chances of contacting Trench Foot‚ the men were ordered to change into dry socks as often as possible. Around 1916‚ John Logie Baird started to sell socks prepared with borax to help alleviate the problems of wet feet. These were widely used by soldiers at the front. The soldiers were also instructed to grease each others’ feet with whale oil at least once a day. It is estimated that a battalion (1007 men and 30 officers)
Free World War I Trench warfare John Logie Baird
The solution in the test tube from step 9 contains the Cu2+ ions. To this solution‚ add 1 mL of 3% H2O2. Boil the solution down to a volume of about 1 mL. Now add 6 M HCl until the pH reaches 0.5. Once the pH has been lowered to 0.5‚ add 1 mL of 1 M CH3CSNH2 (thioacetamide) to the test tube. 15. Heat the test tube in a BWB under a fume hood for at least 5 minutes. The reactants will generate H2S ‚ a toxic gas‚ in
Premium Chemistry Scientific method Ion
Experiment 4 Composition of a Post-1983 Penny Lab Report Background: Through the use of percent composition one can easily find out how much of a certain element is in a compound or an item such as a post-1983 penny. The experiment will be using HCl a strong acid to dissolve all the zinc inside the outer copper shell. The reaction follows as such; Zn+2HCLZnCl2+H2‚ but there will be no reaction with copper. The portion that will be measured is the mass of copper left after all of the Zn goes through
Premium Copper Zinc Hydrochloric acid
OBJECTIVE: To determine and compare the amount of calcium carbonate content of brown and white eggshells. MATERIALS: white and brown eggshells‚ water‚ deionized water‚ beaker‚ pipet‚ flask‚ test tube brush‚ funnel‚ hotplate‚ mortar‚ pestle‚ ethanol‚ HCl‚ phenolphthalein indicator‚ sodium hydroxide PROCEDURE: (Complete for both white and brown eggshells) 1. Get one egg and beaker and bring it to your lab station. 2. Break the egg into a beaker. 3. Add water to the egg and stir before you pour
Premium Calcium carbonate Sodium hydroxide Water
100 mL of 1.00mol/L HCl(aq) to the calorimeter. 2. Record the initial temperature of the HCl(aq) to the nearest tenth of a degree. 3. Find the mass of no more than 0.80 grams of MgO(s) powder. Record exact mass. 4. Add the MgO(s) powder to the calorimeter containing the HCl(aq) swirl the solution gently‚ recording the highest temperature reached. 5. Dispose as directed by teacher. Part 2: Determining ΔH of reaction (3) 1. Using a graduated cylinder‚ add 100mL of 1.00mol/L HCl to the calorimeter
Premium Chemistry Oxide Magnesium
agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked in two different substances (HCl and NH4OH) were inserted into the two ends of the glass tube. The substance with the lighter molecular weight value (NH4OH‚ M = 35.0459 g/mole) diffused at a faster rate (dAve = 25.8cm)‚ resulting in the formation of a white ring around the glass closer to the side of the heavier substance (HCl‚ M = 36.4611 g/mole; dAve = 10.8 cm). The agar-water gel set up was composed of a petri dish of agar-water
Premium Molecular diffusion Hydrochloric acid Ammonia
Obtain and set up a simple calorimeter. Add 100 mL of 1.00 mol/L HCL(aq) to the calorimeter using a 100 mL graduated cylinder. On the data table created in the first step‚ take note of and record the initial temperature of HCL(aq). Collect no more than 0.80 g of MgO(s) powder. Record the mass on the data table. A group member should then add MgO(s) powder to the calorimeter containing HCL(aq). Make sure to swirl gently. After a certain time when the temperature no longer rises
Premium Chemistry Chemical reaction Magnesium
Detection of Ions in Solutions Using Acid/Base Chemistry: A Quality Control Test Objective: This lab focuses on the detection of ions using titration as an analysis tool. You will standardize NaOH and HCl solutions so that you know the exact concentration and then prepare samples of common household items in order to determine the amount of calcium in Tang®‚ Mg(OH)2 in Milk of Magnesia‚ etc. You will learn to prepare samples of a specified concentration‚ learn about acids and bases through
Premium PH Titration Hydrochloric acid