Reactions Lab David Vaghari INSTRUCTOR: Dr. Chernovitz Monday, July 23, 2012 Oxygen Production Introduction In this lab, potassium chlorate will be decomposed producing oxygen gas and potassium chloride. The hypothesis is that the reaction will yield 3.916 grams of oxygen gas. Materials Test tube 10 grams potassium chlorate Bunsen burner Procedure Step 1. Obtain a test tube, place a 10 gm of potassium chlorate. Step 2.
Coal (activated carbon) hypothesis = If coal or activated carbon is added to water then the acidity of water is basic. 2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1? Explain how you determined this. a. Pyrite hypothesis accept/reject = I accept the hypothesis because after adding pyrite to water and letting it sit for 48 hours the acidity level increased b.
Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds. Then, add the supernatant into the boiling test tube and repeat this step one more time with another 1 mL of deionized water. Acquire a pair of metal test tube holders and heat the boiling test tube to evaporate the water for 15 minutes. Let is cool after and weigh it. Then, calculate a percent yield of zinc iodide and write a balanced chemical equation and determine the limiting
Alka Seltzer Lab  Jozelle Dela Torre May 29th, 2014 Introduction: A chemical reaction shows what ingredients (REACTANTS) are needed to make something new (PRODUCTS) Reactant (a) + Reactant (b) ----(makes)----à product (ab) Example: hydrogen (H) + oxygen (O) ----(makes)----à water (H2O) (a) (b) (ab) In order for a chemical reaction to occur, the particles (ATOMS) have to physically come in contact with one another. Anything that increases the chance (frequency - amount of times) of these atoms touching one another, will increase the rate (SPEED) at which the products (result) are formed. Purpose/Problem: To determine if the rate of the reaction (SPEED) can be increased by increasing the temperature of the reactants (ingredients). Hypothesis: If the water is at boiling point, then the reaction will occur faster. Materials: 3 beakers Thermometer 3 Alka-Seltzer tablets Stopwatch Mortar and pestle Source of hot water Ice cubes Graph paper Procedures: Hot water- Run water from the hot tap until it is hot as possible Fill beaker with 80 mL of hot water Use thermometer to take temperature of water.
We will be talking about parts per million (ppm). 1% = 1 x 10-2 = 10,000 ppm Pre-anthropogenic (1850 AD) concentration means CO2 levels in the atmosphere before humans started to burn coal, peat, oil, and gas in vast quantities. In 1850, the concentration of CO2 in the atmosphere was 280 ppm. CO2 is increasing in the atmosphere at the rate of approximately 2 ppm/yr due to human interaction. In 2013 AD, CO2 in the atmosphere is 396 ppm.
Place temperature probe through hole in cardboard lid and position probe about 1cm above bottom of calorimeter 15. Obtain an exact mass of hot water (~50mL) d. Should be approx. 45-60C above room temperature 16. Record temperature of cold water and hot water immediately before mixing the two. 17.
a. Pyrite hypothesis accept/reject = Accept, because the pH level did rise within the 48 hour period during the experiment. b. Coal hypothesis accept/reject = Accept, because the pH level did rise within the 48 hour period during the experiment. 3. Based on your data, what effect do you predict coal mining has on the environment?
Set the stopwatch to 1 minute. Use a lighter to light the fuel. Blow out the fire when the timer reaches 1 minute. Measure the final temperature of the water using a thermometer. Then measure the final mass of the fuel using a mass scale.
Put a few iron filings back into the 100 mL beaker. 17. One lab partner should take the magnet to the back table and put the iron filings into the blue tray. 18. The other lab partner should add the 20 mL water to the 100 mL beaker and stir for one minute.
1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = If pyrite is added to a beaker with 100mL of water, then it will reduce the pH over 48 hours. b. Coal hypothesis = It activated carbon is added to a beaker with 100mL of water, then it will increase the pH over 48 hours.