If you had the choice between a 1-litre beaker and a 1 litre graduated cylinder, which one should you use to measure volumes with maximal precision when making 1 litre of PBS? (you can perform an internet search to find this if you are not sure of the answer)

A piece of lead weighing 23.814g is placed in ethyl alcohol in a graduated cylinder. The volume of the lead is 2.10cm ^3. The best value for density of lead from this data is:

A student determined in a set of four experiments that the density of magnesium metal was 1.66 g/ml,1.65 g/ml, 1.67 g/ml, 1.67 g/ml. The accepted value for its density is 1.72 g/ml. What can you concludeabout the precision and accuracy of the student’s data?

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 student poured two liquids (ethylene glycol and mercury) into a tall graduated cylinder to perform an experiment. Which of the following observations is false? Iron Density of various substances Substance Ethylene glycol Chloroform Mercury Gold Density (g/cm³) 7.8 1.09 1.49 13.5 19.32 O Chloroform floats on top of ethylene glycol. O Iron floats on top of mercury. O Iron sinks in chloroform. O Gold sinks in mercury. O Ethylene glycol is on the topmost layer.

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits. 20.9 cm X 12. cm = 641.8 mol 59.25 L = 20.9 cm x 23. cm = || cm 2 mol L cm 2 x10 X Ś

The diameter of an atom is approximately 1 x 1010m. What is the diameter in millimeters? (Hint, your answer will be in scientific notation, use the format of 1x10-??mm.) (please provide your answer in scientific notation with the correct number of significant digits and units.)

A chemist must dilute 80.6 mL of 82.1 uM aqueous mercury(II) iodide (Hgl,) solution until the concentration falls to 31.0 µM. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Round your answer to 3 significant digits.

Liquid Tylenol has 325 milligrams of acetaminophen per 12.5 milliliters of liquid medicine (a fact that would be commonly abbreviated as 325 mg/ 12.5 ml). It means that if you could pour Liquid Tylenol into a 12.5 milliliter cup and separate all of the ingredients, you would find that it contains 325 milligrams of acetaminophen (the active ingredient that relieves pain) along with some inactive ingredients like flavorings. The doctor orders 260 milligrams of acetaminophen for a patient. If the patient takes the medicine in the form of Liquid Tylenol, how many milliliters of Liquid Tylenol would he need to take to get the prescribed amount of acetaminophen?

A student sets up the following equation to convert a measurement. ( The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation. Note: your answer should be in the form of one or more fractions multiplied together(6.2×10^4 Pa×cm^3)× =?kPa×m^3