CHEMISTRY 1 DENSITY LAB

Part 1 – Solids NAME HOUR

Objectives

·  Define density and distinguish among materials based on densities.

·  Perform calculations involving density

Procedure

Solid Samples

·  Measure the mass of each object

·  Determine the volume of each object by the water displacement method

·  Use mass and volume to calculate the density of the object

Data

Mass of / Volume (mL)
Metal (g) / water / water + metal / displaced
Brass
Iron
Aluminum
Copper

CALCULATIONS (Show your work!)

Determine the density of your solid samples:

Brass Iron

Aluminum Copper

Questions/Problems

1. Determine the volume of a copper penny if its mass = 3.05 g.

2. Determine the mass of a cube of aluminum that is 2.5 cm per side

3. An unknown metal object is measured to have a mass of 492 g and a volume of 63.9 mL. Which of the four metals measured in this lab could it be made of? Justify your answer.


CHEMISTRY 1 DENSITY LAB

Part 2 – Liquids NAME HOUR

Objectives

·  Define density and distinguish among materials based on densities.

·  Perform calculations involving density

Procedure

Liquids

·  Tare a graduated cylinder (record the mass of the cylinder empty or zero your scale)

·  Add a small amount of liquid, record the mass and the volume

·  Add more, record mass and volume

·  Repeat. Get 5 mass & volume data sets

Data

WATER / ALCOHOL
Volume (mL) / Mass (g) / Volume (mL) / Mass (g)
0.0 / 0.0 / 0.0 / 0.0

Construct a line graph of Mass vs Volume. Graph Paper will be provided.

Plot data for both water and alcohol and draw a best fit straight line for each.

You will use these lines to calculate slope. Make sure to mark the points on your graph that you use for your slope calculations

Calculations

Show your equation, substitute your data including units, and your answer. Please round your answer to the appropriate number of significant digits

Slope of Mass vs Volume line for Water

Slope of Mass vs Volume line for Alcohol

PROBLEMS/QUESTIONS

·  Show your work!

·  Use the densities from your lab to answer each problem

1. Which would have a greater mass, 250 mL of water or 300 mL of alcohol?

2. What volume of alcohol would have a mass of 6.5 kg?

3. If water and alcohol did not mix, which would float on top of the other?

4. Determine the mass of 7.5 L of water


Construct a line graph of Mass vs Volume.

Plot data for both water and alcohol (2 lines on same graph) and draw a best fit straight line for each.

You will use these lines to calculate slope. Make sure to mark the points on your graph that you use for your slope calculations

Note:

·  Choose the correct axis for each variable

·  Label each axis

·  Use a consistent number scale for each axis

·  Plot your data as precisely as possible

·  Draw a best fit straight line