What is the unit of measure for the graduated cylinder? What is the maximum it can measure? What is the minimum measurement? 2. Look at the smallest division on the graduated cylinder. What amount does the smallest division measure? 3. What are the units of measure on the plastic cup? What is the maximum amount it can measure? What is the minimum measurement?

1. Which of the three substances do you think will have the largest density? please show your calculations. 2. Increasing the volume while maintaining constant mass, results in a density value that is The last photo is : Mass 42.72g Volume: 37.22cm^3

1000 900 800 700 600 500 400 300 200 100 A sample of liquid has a measured volume of 561 mL. 1. How many significant figures does the measurement have? 2. Suppose the volume measurement was made with a graduated cylinder just as you see above. How far apart were the scale divisions on the cylinder, in mL? 3. Which of the digits in the measurement is uncertain?

Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/mL. The density of the liquid that boiled off turns out to be 0.77 g/mL. Sample B is a solid yellow cube with a total mass of 50.0 g. The cube is divided into two smaller 25.0 g subsamples, and the volume of each subsample is measured. The volume of the first is 48.2 cm³ and the volume of the second is 58.1 cm³. When the experiment is repeated with a new 50.0 g. sample, the volume of the two 25.0 g subsamples is 52.2 cm³ and 50.8 cm³.