= O MEASUREMENT Setting up a unit conversion 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. m (0.040-2 gcm x10 0.0 X μ 0/0 S

Question 1: Determine whether the answer to each calculation has the correct number of significant figures. If not, correct it: 1A) 89.763 + 22.4581 = 3.997 1B) 4.32x1012 ÷ 3.1x104 = 1.4x1016 Question 2: Perform this calculation to the correct number of significant figures 9443 + 45 – 9.9 x 8.1x106 Question 3: Perform the following conversions: 3A) 78.3 cm to inches 3B) 22.5 lbs. to micrograms 3C) 396 in to L 4A) A new penny has a mass of 2.49g and a volume of 0.349cm³. Is the penny pure copper?

In the lab you weigh 12.54 g of NaCl to make a stock solution of 5.12 M. To further dilute the solution to 100.0 mL of 0.125 M, how much of the stock solution do you need? Give your answer in mL. Use correct number of significant figures.

In a similar experiment, a pair of students was asked to measure out 10.00 mL of water using a 25-mL buret. The data they collected is shown in the table below: Trial Student 1 Student 2 1 9.98 mL 9.97 mL 2 10.00 mL 9.99 mL 3 9.99 mL 10.01 mL Which of the following statements best describes the set of data collected by each student? Student 1 both accurate and precise Student 2 only accurate [ Choose] only accurate both accurate and precise only precise