Question

CHE115 Tear this page out of your laboratory manual Name: our laboratory manual and submit it to your TA with your answers Zinc reacts with lodine in the fixed mass ratio of 1 gram of zinc to ne, how many grams of iodine are required to completely react with B. Post-Lab Assessment Questions: (32 pts) 1. (4 pts) Given that zinc reacts with i 3.88 grams of iodine, how many grams of 4.2 grams of zinc? You must show your work to get credit. 2. Consider the chemical reaction that that occurs when calcium cho with sodium phosphate (Na3PO4). a) (4 pts) Write the balanced chemical equation. b) (4 pts) Using the data you obtained reaction of CaCl2 with Na PO. Represent this ratio as 1 g of CaCl2 to - of Na3PO. at occurs when calcium chloride (CaCl2) reacts Pos Using the data you obtained today determine the fixed mass ratio for the grams 3. Given that a cup of coffee costs 90 cents and you have 100 grams each of nic quarters and dimes, if a nickel weighs 5.00 g, a quarter weighs 5.55 g and a dime weighs 2.22 g a) (8 pts) What is the maximum number of cups of coffee can you buy with your change? b) (2 pts) How much money will you have left over? 4. (10 pts) The law of mass conservation is another fundamental law in chemistry. This law states that matter can neither be created nor destroyed, which means that in a chemical reaction where all of the reactant is converted into product, the mass of reactant that reacts must be exactly equal to the mass of product produced. Next week you are going to test the law of mass conservation. To do this you will need to design your own experiment. a) Consider the 2 precipitation reactions you have already studied this semester. b) Think about an experimental procedure that you can use next week. Remember that you are trying to collect data that can be used to illustrate the law of mass conservation c) Contemplate how you might visually represent this data in the form of a graph. b) What are the variables that you might need to plot. (11) How would your choice of graph illustrate the law of mass conservation.

Answer 1

1 mole of Zn reacts with 1 mole of I2  

.. og Date : Zht Iz Zn Iz more T Imre > i mole zn Dennined Required for for 4.2 gram of zake Iso mole 14.2 & given weight - 65.30 J Atent weight Molecular so same moses are meaning of I2. mele - Height o not weight 14.2 - W - W: 25484.2 Th. 30 254 65.38. = 16.31 gram