A molecule is the smallest piece of a substance that retains the properties of that substance.ĭo ionic compounds have molecules? Explain. What is the difference between an atom and an element?Īn atom is the smallest piece of an element that retains the properties of that element.Ī molecule is two or more atoms that are hooked together, are stuck together, and act as one unit. How many centimeters (cm) are there in 1.2 m?.How many liters (L) are there in 500 mL?.How many grams are in 1.5 moles of gaseous nitrogen (N 2)? See the last question for data.How many grams are in 1.5 moles of atomic nitrogen? Atomic nitrogen has a molar mass of 14 g/mole. We call these numbers the atomic weight or the molar mass. The periodic table provides conversion factors between grams and moles.Use units and dimensional analysis to do the following problems. The known value is between these two numbers. The range goes from 2.56 g/mL to 2.72 g/mL. What is the range of their reported value and does it encompass the known value for the density of aluminum? A group of students reported a value of 2.64 ± 0.08 g/mL for the density of aluminum (known value is 2.70 g/mL). Since 9.7 g divided by 1.36 mL is 7.13 g/mL it is more likely to be zinc.Ī reported value with its uncertainty (+/- or ±) should encompass the correct value for the measurement. She then used a displacement technique to determine a volume of 1.36 mL. She used a balance to determine a mass of 9.7 g. A student was given the task of determining if the pure metal she had was nickel (d = 8.90 g/mL) or zinc (d = 7.14 g/mL).What is the mass of a 15 mL sample of this liquid CO 2? At a certain pressure the density of the liquid is 0.466 g/cm 3. One way to liquify carbon dioxide is to put it under a lot of pressure.What is the volume of 1.85 g of Aluminum? Under normal conditions aluminum has a density of 2.70 g/ml.Physical change, the salt can be recovered by evaporating the water.Ĭonvert to or from exponential notation as needed. Acid rain reacting with limestone headstones.Ĭhemical change, the limestone reacts with the acid to form CO 2, H 2, and water.Physical change, the sugar can be recovered by evaporating the water. Label each of the following as either a chemical or a physical process:Ĭhemical change, paper is changed to CO 2 and H 2OĬhemical change, iron is changing to iron oxide. Matter, Conversion Factors and Dimensional Analysis (Ch. The textbook questions will have additional information that may be useful and that connects the problems to real life applications, many of them in biology. The study guide also has worked out examples. The exercises are worked out examples of the questions at the back of the chapter. You should also study the Exercises within the chapters. This is just the required list of problems for quiz purposes. Note: You are expected to go to the end of chapter problems in your textbook, find similar questions, and work out those problems as well. by Brown, LeMay, Bursten, Murphy and Woodward), but any edition of this text will do for this course. The last edition I required students to buy was the 12 th edition (CHEMISTRY The Central Science, 12th ed. The textbook associated with this homework is CHEMISTRY The Central Science by Brown, LeMay, et.al. This page has all of the required homework for the material covered in the first exam of the first semester of General Chemistry. Chem I Homework Exam 1 Chem I Homework Page, Exam 1 Material Homework Page Without Visible Answers
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