Name ____________________________________________________ Block/Hour ________
Date _________________
http://www.hazelwood.k12.mo.us/~grichert/explore/dswmedia/density.htm
Instructions:
You can grab on object by holding the mouse down over it. You can then drag the object to either of your tools: the beaker which measures water displacement (note the sophisticated thumb tack that hold things underwater at the time) and the big scale.
Using the tools you will find the mass and volume of the objects. You can also drop your objects in the pail to see if they sink or float. Then, consider relationships involving the mass and volume to try to predict the sinking or floating.
Part 1:
Complete the following table using the Internet program at the address above.
|
Description |
Mass (g) |
Volume (mL) |
Density (g/mL) |
Float? |
Rank |
|
|
Blue
Square |
|
|
|
|
|
|
|
Blue
Triangle |
|
|
|
|
|
|
|
Red
Square |
|
|
|
|
|
|
|
Red
Oval |
|
|
|
|
|
|
|
Pink
Square |
|
|
|
|
|
|
|
Purple
Oval |
|
|
|
|
|
|
|
Green
Triangle |
|
|
|
|
|
|
|
Grey
Triangle |
|
|
|
|
|
|
|
Tan
Rectangle |
|
|
|
|
|
|
|
Red/Black
Rectangle |
|
|
|
|
|
|
What is the density of the liquid in the pail? ____________________ g/cc = g/mL (cc is a cm3)
(Note a cc is the abbreviation for cubic centimeter which is equal in volume to a milliliter,abbreviated mL)
Find the mass and volume of the objects. Calculate the density of the objects (mass divided by volume). Write "YES" if the object floats, and "NO" if the object sinks. Rank: Number the objects from lowest density (1) to highest density (10).
Conclusion:
Do you notice any correlation (pattern) between the density of an object and the ability of the object to sink or float? _____________ If so, state your finding below.
Which object has the greatest volume? __________________ the least? ___________________
Did they float? Which one? ___________________
Which object has the greatest mass? _____________________ the least? ___________________
Did they float? Which one ____________________
Which object has the greatest density? ____________________ the least? ___________________
Did they float? Which one? ___________________
Part 2:
Procedure:
· Complete the following table and copy the object’s density from the pervious side of this worksheet:
·
Note: change the density of
the liquid from 0.5 g/cc, to 1.5 g/cc, to 2.0 g/cc, and then to 2.7 g/cc.
·
Record “yes” if the object floats, and “no”
if the object sinks in each fluid.
|
|
Fluid
Density à |
0.5
g/cc |
1.5
g/cc |
2.0
g/cc |
2.7
g/cc |
|
Description |
Object
Density |
Float? |
Float? |
Float? |
Float? |
|
Blue Square |
|
|
|
|
|
|
Blue Triangle |
|
|
|
|
|
|
Red Square |
|
|
|
|
|
|
Red Oval |
|
|
|
|
|
|
Pink Square |
|
|
|
|
|
|
Purple Oval |
|
|
|
|
|
|
Green Triangle |
|
|
|
|
|
|
Grey Triangle |
|
|
|
|
|
|
Tan Rectangle |
|
|
|
|
|
|
Red/Black Rectangle |
|
|
|
|
|
Which objects floated with a liquid density of 0.5 g/cc that did not float when the liquid density was
1.5 g/cc?
____________________________________________________________
How did the density of the objects that sank compared to the density of the liquid?
What is the minimum liquid density that floats all the objects except one? ___________________________
Does the mass of an object tell you whether or not the object will sink or float? ______________________
What about the volume (do bigger objects sink compared to small ones)? __________________________
What property of matter allows you to determine if it sinks or floats in a given liquid? ________________
Whether an object floats or sinks depends on two factors. What are they? __________________________