Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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2. The slopes of the lines in graph 1 can be interpreted as a useful quantity around the lab if you were working with water or one of these solutions. Explain the significance of the slope and how it might be used around the lab. Hint: look at the units and remember when a line is drawn it represents a sort of average as it places about half of the data above and below it due to random errors.
A student obtains the following data: a- Mass of evaporating dish 21.345 g b- Mass of evaporating dish and saturated NaCl solution 42.817 g c- Mass of dish and NaCl after evaporation 38.915 g Report the Mass % of NaCl in this solution. Write the number as a percentage with the correct number of significant figures as shown. (i.e. 25%) There should be no space between the numbers and the % sign.
The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same height? Each half dollar is 2.15 mm.
number of half dollars:
Each half dollar has a mass of 11.340 g. How much would the stack of half dollars from the previous question weigh?
mass in g:
What is the value, in dollars, of the same stack of half dollars?
value in dollars:
The 2017 U.S. gross domestic product (GDP) was valued at 19,390,604,000 dollars. How many Gateway Arch‑height stacks of half dollars are needed to match the GDP in value?
number of stacks:
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- An antacid tablet weighing 0.853 g contained calcium carbonate as the active ingredient, in addition to an inert binder. When an acid solution weighing 56.519 g was added to the tablet, carbon dioxide gas was released, producing a fizz. The resulting solution weighed 57.152 g. How many grams of carbon dioxide were produced?arrow_forward1.41 How many significant figures are present in these measured quantities? (a) 1374 kg, (b) 0.00348 s, (c) 5.619 nm, (d) 2.475103cm , (e) 33.1 mLarrow_forwardSome iron wire weighing 5.6g is placed in a beaker and covered with 15.0g of dilute hydrochloric acid. The acid reacts with the metal and gives off hydrogen gas, which escapes into the surrounding air. After reaction, the contants of the beaker weigh 20.4g. What is the mass of hydrogen gas produced by the reaction?arrow_forward
- How to properly use significant figures in this case?Ccal = (-ΔHrxn x nLR)/ΔTCcal = (-55.85 kJ/mol x 0.00100 mol)/5.3°CCcal = ?????? It would help if you can clarify the rules for multiplication and division. Thanks!arrow_forwardThe composition of a mixture of potassium chlorate and potassium chloride is to be determined. A 9.94 gram sample of the mixture is heated until the creation of oxygen gas stops. If the sample mass after heating is 7.54 grams, what is the percent by mass of potassium chlorate in the mixture? Report your answer with 3 significant figures.arrow_forwardThree blocks of the same shape and size are placed in front of you. Block A has a mass of 3.0 g, block B is 5.0 g, and block C is 10.0 g. Which has the higher density?arrow_forward
- thickness of aluminum foil mass of aluminium foil 0.405 g length of aluminum foil 9.5 cm width of aluminum foil 9.6 cm what is the volume of aluminum foil? what is the thickness of aluminum foil? show calculations.arrow_forwardIsn't 10.3 Liters only? Because when following the fewest sigfig in the equation, it should be in 3 significant figures and not 4 (10.33)? Thank you so mucharrow_forwardAnswer the following questions regarding this chemical reaction: Cu(s) + HNO3(aq) --> Cu(NO3)2(aq) + H2O(l) + NO2(g) c. If you want to produce 100.0 g of Cu(NO3)2, how much volume of HNO3 is needed? Density of HNO3 is 1.51 g/cm3. Give your answer in mL. Use the correct number of significant figures.arrow_forward
- A chemist must dilute 78.3 mL of 9.91 mM aqueous calcium sulfate (CaSO4) solution until the concentration falls to 3.00 mM. She'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits. ÚL x10 ?arrow_forwardBob and Jill are measuring the height of Mr. Chenet (Mr Chenet is 1.8593 meters tall). Bob gets a measurement of 1.6329, while Jill gets a measurement of 1.8. This means that Bob is more accurate, while Jill is more precise. True or False?arrow_forwardA sample of gold alloy has a mass of 9.3 kg. It is determined that 0.6 kg of the alloy is actually made up of copper and zinc, with the remainder being gold. Calculate the percentage of this gold in the alloy? Express your answer to the nearest percentage (nearest ones place). Hint: calculate the mass in grams of the gold in the alloy, divide by the whole mass of the alloy, and multiply by 100%. Round your answer to two significant figures. (I had to alter the wording of this question since it wasn't calculating significant figures properly, so if you got it wrong because of significant figures you can assume you probably actually got it correct.)arrow_forward
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