Question

Density 1. Explain why a highly precise measurement does not always means a highly accurate one. 2. Read the volume in the diagram below. Report your answer in the line, including the correct number of significant figures 60 50 mL Answer: 3. Why is the density of a substance independent on sample size? 4. Ahmed obtains a silvery metallic unknown. She masses the metal and finds that she has 60.56g. When she places the metal in a graduated cylinder that contains 25.2 mL of water, the final volume is 32.2 ml. a) Calculate the change in volume (V) of water in the graduated cylinder. I

chemistry density

Answer 1

1) Precise values are the one which has closeness among the measured values but may or maynot equal to the true values.

So, precise values, may or maynot equal to the true value (accurate value)

2) From the diagram, Volume of solution is 56 ml

3) Density is an intensive property, it doen't depends on the size of the sample.

It is a ratio of two extensive properties. Density = Mass/Volume

4) mass of metal = 60.55 g

a) change in Volume = final volume - initial volume

                              = 32.2 - 25.2

                              = 7.0 mL

b) Density = Mass/Volume

                 = 60.55/7.0

                 = 8.65 g/mL

c) From the given data, the unknown metal is Cadmium.