accuracy of an experiment determined? What is density and how will it be used in the Measurements Experiment? 2. You are asked by the King of Allegesia to determine if the crown he was given for his birthday is pure gold. The density of pure gold is 19.32 g/mL; the density of water is 0.998 g/mL at 20°C. There is a container when filled to mark contains 1900.0 mL. When the container is filled with water to the mark, it has a mass of 2499.5 g. The crown is placed in the container and filled to mark with water and now weighs 15,113.3 g. The crown has a mass of 13,910.0 g. What is the density of the crown? Is the crown pure gold? 3. Linus Pauling (recipient of 2 Nobel Prizes, one for Chemistry and another for Peace) wrote a book, '"Vitamin C and the Common Cold", which proposed that large doses of vitamin C can cure the common cold. One commercial over-the-counter production consists of 500.0 mg tablets that are 20.0 % by mass Vitamin C. How many of these tablets are need for a 1.00 g dose of vitamin C? Each 500.0 mg tablet costs 2 cents. If you can take a 1000.0 mg table of pure vitamin C for 9 cents a tablet, which would be more cost effective?

4. In Figure 4 below, a graph shows the relationship between mass and volume for two substances, A and B. Use the graph to answer questions about these two substances. FIGURE 4: Mass and VOume Reationships a) Which substance is more dense, substance A or substance B? Explain your reasoning. ४० Substande A Z 60 b) Find the slope of the line for both A and B using correct units. State the physical meaning of the slope ("For every...") for each substance. slope A 50- 40 For cvery... %3D 20 Substance B Slope B Y2-Y. X2-X volumel(mL) For every... c) Water has a density of 1.00 g/mL. Draw the line representing water on the graph in Figure 4. d) Determine whether substance A and B will sink or float when placed in a bucket of water. Substance A: sink float Substance B: sink float (circle correct response) Mass (g)

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Use the References to access important values if needed for this question. A general chemistry student found a chunk of metal in the basement of a friend's house. To figure out what it was, she used the ideas just developed in class about density. She measured the mass of the metal to be 323.0 grams. Then she dropped the metal into a measuring cup and found that it displaced 16.5 mL of water. Calculate the density of the metal. Density= g/mL Densities of Some Common Substances Substance Density (g/mL) Water Aluminum 2.72 Chromium 7.25 Nickel Copper Silver Lead Mercury 1.00 Gold Tungsten Platinum 8.91 8.94 10.50 11.34 13.60 19.28 19.38 21.46 Previous Next> ?

10) Solve each problem and report your answer to correct significant figure and units. Remember that units multiply, divide, add, subtract and simplify just like variables. ml 65.0 kg + 0.05 kg + 179.1 kg = 17 g x 1.08 175 cm - 22.5 cm = 9.20 g/ (1.72 cm³ + 21 cm³) = ot avlo2a 3.23 x 10=23 ma (23.0 lb/gal)(2 ft) = (2.1 x 10-10 cm)3 to 1edmun sdi enimale0 (2.23 x 103 g)(9.0 × 10-3 g) (3.1 x 104 nm²)1/2 = Jmy to. 10.1 x 10-7 s2

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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, tetrahydrofuran, dimethyl sulfoxide, and chloroform. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density g 1.6 alo carbon tetrachloride 3 cm Ar diethylamine 0.71 3 cm tetrahydrofuran 0.89 3 cm

1. What is the length of the rod shown below? 3 4 7 10 2. If Student A measures the volume of a liquid and reports its volume as 23.50 mL and Student B measures a different amount of the same liquid and reports its volume as 15.0 mL, is it likely that the students used the same measuring device? Yes or no? Explain your answer. 3. If you were asked to measure 25.0 mL of a liquid and to transfer it to another container, which of the following glassware could you use? Choose all that apply. Give reason(s). a) A 50-mL buret with smallest divisions of 0.1 mL b) A 50 mL beaker with smallest divisions of 10 mL c) A 50-mL volumetric flask d) A 50-mL graduated cylinder with smallest divisions of 1 mL e) A 25-mL pipet 4. A group of five students attempted to estimate 100 g of a substance by balancing the amount of the substance with a 100-g standard mass and obtained the following masses after each estimated amount was weighed: 95.8634 g, 80.8125 g, 106.5078 98.2865 and 86.4453 Create a data…

A sample of vegetable oil with density 913 kg/m3913 kg/m3 is found to have a mass of 46.7 g.46.7 g. Find the volume of this sample.

The chemist measures the volume of the unknown liquid as 0.615 L and the mass of the unknown liquid as 385. g. Calculate the density of the liquid. Be sure your answer has the correct number of significant digits. Is it possible to identify the liquid? If it is possible to identify the liquid, do so.