Chem Discussion 2-1

Suppose you were measuring out an organic liquid, and some of it is evaporated after you have performed the volumetric measurement while you are weighing out the sample. What effect would this have on the densities you calculated? Will you overestimate or underestimate the density of the liquid? Would this cause poor accuracy, low precision, or both? Explain briefly.

Measure the diameter of the circle using Ruler A and Ruler B.Given that the actual diameter of the circle is 2.264 cm, classify the following statements that describe the diameter measurement of the circle according to the ruler. Drag the appropriate items to their respective bins. • View Available Hint(s) Reset Help Ruler A Ruler B The diameter of the circle has one certain digit and one uncertain digit. The diameter measurement has two significant figures. The diameter measurement has three The certainty of the diameter significant figures. measurement is smaller. The certainty of the diameter measurement is greater. The diameter of the circle has two certain digits and one uncertain digit.

Wallie weighed 3 different cylinders that all looked the same. He noticed that the masses were all different and wondered how much they deviated from the average. Determine the average deviation, in g, of the cylinder masses below. Cylinder Mass (g) 1 31.8 2 31.39 3 31.96

number 3 and 4 of this part ty in analytical chem

A piece of cardboard is 12.0 cm long, 6.3 cm wide and 0.75 millimeters thick. What is the volume of this piece of cardboard in cubic meters? Enter your answer in the space provided WITHOUT units. Make sure to round your answer to the correct number of significant figures. Please give the number as a normal number, do not use scientific notation.  (In example: a normal number = 4300 instead of the number being in scientific notation as = 4.3 X 103)

[Review Topics) [References) 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 340.3 grams. Then she dropped the metal into a measuring cup and found that it displaced 15.7 mL of water. Calculate the density of the metal. Density = g/mL Densities of Some Common Substances Substance Density (g/mL) Water 1.00 Aluminum 2.72 Chromium 7.25 Nickel 8.91 Copper 8.94 Silver 10.50 Lead 11.34 Mercury 13.60 Gold 19.28 Tungsten 19.38 Platinum 21.46 This metal is most likely Submit Answer Retry Entire Group 9 more group attempts remaining Previous Email InstruC Cengage Learning | Cengage Technical Support W P. 63°F Mostly sunny DII PrtScn Home PgDn End F10 & R T. K L

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, he used the ideas just developed in class about density. First he measured the mass of the metal to be 311.2 grams. Then he dropped the metal into a measuring cup and found that it displaced 15.9 mL of water. Calculate the density of the metal. Density = g/ mL Use the table below to decide the identity of the metal. This metal is most likely Densities of Some Common Substances Substance Density (g/mL) Water 1.00 Aluminum 2.72 Chromium 7.25 Nickel 8.91 Сopper 8.94 Silver 10.50 Lead 11.34

Convert 75 miles into meters. (Use the conversion 1.0 km = 0.621 miles and use metric conversions for the rest of the conversions).

Please don't provide handwritten solution .....

Very large and very small numbers are easier to write in scientific notation. For example, the number, 0.0000516 would be written 5.16  10-5 in scientific notation. How would you enter this number in WebAssign using scientific notation to 3 significant figures? (WebAssign uses e-notation for entering scientific numbers, for example, 1.23e-4.)

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> ?

Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the displayed data in the data table in the report sheet. Make sure to include the right number of significant figures in the measurements and calculations. Mass measurement 7.1 g Volume of water measurement. There's only one measurement here – the larger image is for magnification only. -20 15 m Volume of water and metal measurement. There's only one measurement here – the larger image is for magnification only. 20 m 15

Read the paragraph below and identify the aspects of the scientific method that best align with each numbered sentence or phrase. Some answer options may be used more than once. The options are observation, theory, hypothesis, revised hypothesis, experiment, and law. The number option is before the period of each sentece. You are preparing to study for your chemistry exam and flip the switch to turn on your desk lamp. You find that the light does not come on (1). Based on past experiences, you guess that your roommate unplugged the lamp to use their hair drier and forgot to plug the lamp back in (2). You look under the desk and see that the lamp is plugged in (3). You decide instead that the lightbulb must be burned out (4) but you find that the light won’t turn on with a new lightbulb, either (5). You decide that the lamp is broken (6).

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…

I submitted this question just a bit ago and I received an answer that totally makes sense ......  2.5 x 10^-9 Yet my textbook is saying this answer is incorrect. Can you help me?

2. Identify as true (T) or false (F): Scientific method may never prove a theory to be wrong. Repeat measurements that fall close to the true value are both accurate and precise. There is only energy in the Universe and no matter. The number in the quantity '30 miles' is inexact.

Expressing Errors in Measurement: Scientists often express their uncertainty and error in measurement by giving a percent error. The percent error is defined as: % error actual value - measured value x 100 actual value Answer the following four questions. Pay attention to significant figures, and show your work! 1. While doing a lab, a student found the density of a piece of pure aluminum to be 2.85 g/cm°. The accepted value for the density of aluminum is 2.70 g/cm³. What was the student's percent error? 22.70 26 Demystifying Scientific Data: RET 2006, Rev 2

Osmium (Os) is the densest element known (density = 22.57 g/cm3). Calculate the mass in pounds and in kilograms of an Os sphere 15 cm in diameter, about the size of a grapefruit. Enter your answers in scientific notation.

A substance with a density of 2.70 g/mL occupies a volume of 21.3 mL. What is the mass of the sample? Report your answer in units of mg. Do not enter "mg" as part of your answer. Respond with the correct number of significant figures in scientific notation (Use E notation and only I digit before decimal e.g. 2.5ES for 2.5 x 10)

A piece of cardboard is 12.0 cm long and 6.3 cm wide. What is the area of this piece of cardboard in square millimeters? Enter your answer in the space provided WITHOUT units. Make sure to round your answer to the correct number of significant figures. Please give the number as a normal number, do not use scientific notation.  (In example: a normal number = 4300 instead of the number being in scientific notation as = 4.3 X 103)

A student determined the density of a solid to be 2.90, 2.91 and 2.93 g•cm–3. If the actual density of this solid is 2.70g•cm-3, how should the student's results be described?a. High accuracy and high precisionb. Low accuracy and high precisionc. High accuracy and low precisiond. Low accuracy and low precision

The weight of a rock is measured to be 0.097 lbs. After placing the rock in a graduated cylinder containing 19.92 mL of water, the new measurement is 33.21 mL. Calculate the density of the rock in g/mL. Round your answer to 2 decimal places.

An electric current of 155.0 mA flows for 42.0 minutes. Calculate the amount of electric charge transported.. Be sure your answer has the correct unit symbol and 3 significant digits. 0 x10 μ 0 9 X