Lab quiz #2 Density of Solids and Liquids

What is meant by the term precision?

A. How close a measurement is to the accepted or correct value.

A. How close a measurement is to the accepted or correct value.

What is meant by the term accuracy?

B. Refers to how close multiple measurements fall to another

B. Refers to how close multiple measurements fall to another

How many significant figures are in 0.0200?

1. one

2. two

3. three

4. four

c. Three

The Volume of a metal rod is determined 3 times and the experimental values obtained are?

11.06mL 10.89mL 10.82mL

What value would you report as the volume of the metal rod?

1. add all three values and then divide by 3

answer: 10.92mL

At room temperature an unknown solid has a mass of 197g placing the object into a 100mL granulated cylinder which contains 50.0mL of H2O and the water level rises to 60.2mL. What is the density in g/mL?

1. subtract 60.2mL-50.0mL=10.2mL

2.divide 197g/10.2mL= 19.3 g/mL

1. 19.3 g/mL

30.0mL of a liquid is poured into a beaker weighing 100.000 grams and the beaker plus the liquid is found to have a mass of 134.50 grams. What is the density of this liquid?

1. (134.50-100.00)=34.5g

2. 34.5g/30.0mL=1.15g/mL

1.15g/mL

What is a graduate cylinder and what measurements is used for in this experiment?

A graduated means series of calibration marks used for reading measurements

What are the four different methods that are described on the procedures to measure density?

A. Solid Volume by Formula

B. Solid Volume by Displacement

C. Liquid Volume by Gradulated Cylinder

D. Liquid Volume by Volumetric Pipette

What are the differences between these four methods?

Density of metal x Density of salt solutions in order to calculate density in different ways

Which two of the four methods do you think will be more precise?

A. Solid Volume by displacement

B. Liquid Volume by volumetric Pipette

Describe one method by which you will determine the volume of a metal cylinder today.

Solid volume by displacement

Describe one method by which you will determine the volume of a fluid?

Liquid volume by granulated cylinder

identify uncertainly of 0.00569?

+_0.00001 km