Chemistry: A Guided Inquiry, Part 1 8th edition by Moog and Farrell
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Homework Assignment #2 Laboratory Section (circle one) MW9:45 MW1:15 TTh8 Name__________________________ Chem 400 Fall 2022 Due: Wednesday, August 31st (11:59PM) This assignment pertains to Chapter 1 and 2 of Chemistry: The Molecular Nature of Matter and Change (9th Ed.) by M. Silberberg and P. Amateis. Do your work on separate sheets of paper. Clearly indicate your answer with a box or circle. STAPLE THIS PAGE TO THE FRONT OF YOUR ASSIGNMENT. 1. A graduated cylinder has mass of 185.2g when filled with 37.2 mL of saltwater (saltwater density = 1.05 g/mL). a. What is the mass of the empty graduated cylinder? b. What is the total mass of the cylinder and liquid when filled to 61.8mL with chloroform (1.48g/mL) 2. A small cube of platinum measures 71.48 mm on each side. The mass of the cube is 7.83kg. Calculate the density of platinum in g/cm3 and report your answer to the correct number of significant figures. 3. Problem 1.46. List each procedure before you state if it would decrease random error. 4. Problem 2.3. To receive credit in this problem, write down the name of each substance. Next, describe it as a mixture or pure substance. If it is a substance, state whether it is an element or a compound. 5. Problem 2.128. Write down the masses of the elements, the mass of the products, and the mass of the leftover reactant for each step before answering the question 6. When 112.36 g of pure copper reacts with 497.55g of iodine, 561.16g of a compound containing only copper and iodine result. 48.75g of iodine remain when the reaction is complete. a. Do these results support the Law of Conservation of Mass? Explain b. Another student heats 20.73g of copper with 36.65g of iodine. The product is a white compound with mass of 55.00g with 2.38g of copper left over. Is the compound made in this experiment, the same or different than the first one? If different prove that these two experiments together support the Law of multiple proportions.
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