Classify each of the changes/characteristics from Experiment 6 (Chemicals in Everyday Life) as either Chemical or Physical. You smell ammonia upon opening a container of NH4OH. A. Chemical * Gas bubbles evolve after adding a few drops of sulfuric acid to baking soda. B. Physical A precipate forms upon the addition of silver nitrate to a solution of NaCI. * You mixed Nal with bleach and a deep purple color formed. Upon adding mineral oil, the mineral oil layer turns purple. (Classify the change to the mineral oil.)

Classify each of the changes/characteristics from Experiment 6 (Chemicals in Everyday Life) as either Chemical or Physical. You smell ammonia upon opening a container of NH4OH. A. Chemical * Gas bubbles evolve after adding a few drops of sulfuric acid to baking soda. B. Physical A precipate forms upon the addition of silver nitrate to a solution of NaCI. * You mixed Nal with bleach and a deep purple color formed. Upon adding mineral oil, the mineral oil layer turns purple. (Classify the change to the mineral oil.)

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter2: Chemical Compounds

Section: Chapter Questions

Problem 105QRT

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A 15.5 g sample of sodium carbonate is added to a solution of acetic acid weighing 19.7 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After reaction, the contents of the reaction vessel weigh 28.7 g. What is the mass of carbon dioxide given off during the reaction?
Is there a difference between a homogeneous mixture of hydrogen and oxygen in a 2:1 ratio and a sample of water vapor? Explain.
Confronted with the box shown in the diagram, you wish to discover something about its internal workings. You have no tools and cannot open the box. You pull on rope B, and it moves rather freely. When you pull on rope A, rope C appears to be pulled slightly into the box. When you pull on rope C, rope A almost disappears into the box. a. Based on these observations, construct a model for the interior mechanism of the box. b. What further experiments could you do to refine your model?
As part of a science project, you study traffic patterns in your city at an intersection in the middle of downtown. You set up a device that counts the ears passing through this intersection for a 24-hr period during a weekday. The graph of hourly traffic looks like this. a. At what time(s) does the highest number of cars pass through die intersection? b. At what time(s) does the lowest number of cars pass through die intersection? c. Briefly describe the trend in numbers of cars over the course of die day. d. Provide a hypothesis explaining the trend in numbers of cars over the course of the day. e. Provide a possible experiment that could test your hypothesis.
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55. A typical rate of deposit of dust ("dustfall") from unpolluted air is 10. tons per square mile per month. What is this dustfall, expressed in mg per square meter per hour? Assume 1 ton = 2000. lbs. and 1 month = 30 days.
Suppose that you are doing an experiment as part of your Capstone Design Project. A glass vessel originally contains 100 mL of fresh water. Then water containing 1 g/mL of NaCl is poured into the vessel at a rate of 2 mL/min, and the mixture is allowed to leave at the same rate. After 10 minutes the process is stopped, and fresh water is poured into the vessel at a rate of 2 mL/min, with the mixture again leaving at the same rate. Find the amount of NaCl in the vessel at the end of an additional 10 min.
In a flask, you heat a mixture of 735.4 g of sodium nitrate and 700.0 grams of water until all of the sodium nitrate has just been dissolved. At what temperature does this occur? When you examine the solution later, the temperature is 25°C and you notice a white powder in the beaker. What has happened? What is the mas of the white powder? Solubility vs. Temperature 140 KI 130 120 NaNO, gases 110 sólids 100 KNO, 90 80 HCI NH,CI 70 60 NH3 KCI 50 40 NacT 30 KCIO, 20 10 SO2 0 10 20 30 40 50 60 70 80 90 100 Temperature °c Solubility (grams of solute/100 g H2O)
1) a. Amixture contains 34.5 g of copper, 18.4 g of lead and 12.3 g of silver. State the percentage, by mass,of each type of metalin the mixture and create a variety of conversion factors using them. b. Calculate the mass, in grams, of silver in a 3.04 X 102g sample of this mixture. 2) A sample of clean air is found to contain 20.45% oxygen gas by volume. How many liters of oxygen gas are present in a 65.0 μL sample of this air? 3) A 500.0 mg pill (i.e. 500 mg/ 1 pill) contains 2.7% by mass of the active ingredient. How many g of the active ingredient would be present in 12 pills? 4) A sunscreen preparation with a density of 2.82 g/mL contains 3.55% by mass zinc oxide (ZnO). Each tube is filled with 185.0 mL of sunscreen (i.e. 185.0 mL/tube).If you are the manufacturer and you use 5.00 lb of ZnO, how many full tubes of the sunscreen would you prepare?
Density of an aqueous solution of nitric acid is 1.43 g/mL. If this solutioin contained 36.0% nitric acid by mass, what volume of solution would be needed to supply 1.50 mmol of nitric acid?
Prepare a solution of NaCl by accurately weighing approximately 1.45g of NaCl into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all crystals dissolve. Prepare a solution of magnesium chloride by accurately weighing approximately 3.61 g of MgCl2٠6H20 into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mLdistilled water. Mix until all the crystals dissolve. 1. Calculate the molality of the NaCℓ and MgCℓ2.6H2O solutions. 2. Calculate the total mass of water (solvent) in kg: a) Mass of crystal water added (kg): b) Mass of water added (kg): c) Total mass of water added (kg): 3. Calculate the molality of MgCℓ2. All questions follow on from each other. Thanks very much.
Suppose you need a tank of oxygen that is 95% pure. Describe a process by which you could obtain such a gas, starting with air.

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