Electrical Conductivity Station
Student Direction Sheet
- In your fold book do a quick
sketch of the lab setup and copy the data table.
- You have several different
materials. You are going to test the electrical conductivity of each. Make a prediction – will it conduct
electricity and make the bulb light up?
- For the liquids - Clip the end
of the connectors to the paperclips.
Make observations of light bulb.
Record this information in your Data Table. Be careful not to spill the liquids!
- For everything else – touch the
clips to the materials. Make
observations of the bulb.
Data
Table:
Substance
|
Prediction- Will it light up?
|
Observations
(Did bulb light up or glow brighter?)
|
1. Distilled
Water
|
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2. Salt Water
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3. Powerade
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4.Aluminum
foil
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5. Straw
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6. Wood dowel
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7. Paperclip
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Investigating the Density of Regular Solids
In this investigation you will determine the
density of some regular solids. It may be useful to refer to the volume
formulas on p. 8 of your agenda.
Materials
Objects
Balance
Ruler
Other materials may be requested as needed.
Prodedures
Make a data table in the density section of
your flip book like the one below.
Object
|
Mass
(g)
|
Volume
(cm3)
|
Density
|
Ball
|
|||
Pencil
|
|||
Block
|
|||
Use a balance to determine the mass of the
three listed objects. The group should also choose another object to include
(use your imaginations). Find its mass also.
Determine the volume of each object. In your
ISN list the object, its shape, and the formula you used to find its volume.
Include all measurements. Calculate the volume.
Set up the density equation for each item and
calculate its density also.
Investigating Irregular Solids
In this investigation your will determine the
volume of an irregularly shaped object and calculate its density.
Materials
Graduated cylinders
Egg sinkers – 14g and 21g
Water
Procedures
Copy the data table into the Density section
of your fold book
Object
|
Mass of Object
|
Volume of Object
|
Calculated Density
|
Small Egg Sinker
|
14g
|
||
Large Egg Sinker
|
21
g
|
The mass of each sinker is provided.
Choose a graduated cylinder from those
provided. Add 50 ml of water. Read the volume at the meniscus.
Tip the graduated cylinder and slide the
sinker into the cylinder.
Carefully read the new level by reading the
meniscus. Calculate the volume (reading with sinker – reading without sinker =
volume). Record the volume.
Calculate the density using the appropriate
formula which can be found on p. 9 of your agenda. Write the formula in the
Density section
Find the density of the second sinker also.
Comparing Mass and Weight
In this investigation you will compare the
mass and weight of different objects using a balance and a spring scale.
Materials
Balance
Spring scale or dynamometer
Graph paper
Assorted objects
Prodedure
Draw a data table similar to the one below in
your ISN
Comparing
the weight and mass of an object
Object
|
Mass of Object (g)
|
Weight of Object (N)
|
Using a triple beam balance, measure the mass
of each object. Record the mass in grams.
Use a spring scale (dynamometer) to measure
the weight of each object in Newtons (N).
Make a graph of weight and mass using ¼ of a
piece of graph paper. Weight will be on the y axis and mass will be in the x
axis. Remember, all of your work is on this paper. The graph will be trimmed
down and glued into your booklet in the Density section. This should probably
be a scatter plot with a line of best fit.
Reflection: What is the relationship between
mass and weight? Write this in your ISN.
How
Much Mass?
(QUICK
VERSION) In this investigation, you will compare the mass of various objects.
Materials
Balance
Balloon – small, not inflated
Balloon, small inflated
Assorted balls
Other objects as available.
Procedures
Do not touch the objects in the box.
Based on your observations (made without
touching the objects) List the objects from Least Mass to Greatest Mass. Write
down your list.
Pick up each object, one at a time and put
them into a line from least mass to greatest mass. Write down your list.
Use the balance to measure and record the
mass of each object to the nearest 0.1 gram. Record this data in a table on
your density page of your fold book. Be neat, there’s more for this page.
Based on your measurements, create a new list
of the objects in order from least mass to greatest mass. Put this list in your
ISN.
Answer
these questions in your ISN. Be certain to restate the question and support
your answers with observations and data.
What information did you use to decide what the order of
objects should be in the original list?
Is it difficult to determine an object’s mass based on
visual observation alone? Explain your answer.
In what way did your original list change after you were
allowed to hold the items?
How did your list change after you actually measured the
mass of each object? Were you surprised by any of the results?
Thermal Conductivity
Sketch the set up. Some had a thermos of ice
and some had a frozen water bottle in a double wall cup.
Take the temperature of the air with the
traditional thermometer. Use Celsius only. Take the temperature of the icy
bottle with the digital/laser thermometer. Record the temperature.
Answer this questions using arrows and words.
Which way does the heat flow when the ice melts?
Magnetic Force investigation
Copy the data table into your fold
book. Use the centimeter side of a ruler to investigate forces at a distance.
1) Place a ruler and a magnet at a perpendicular position to
each other.
2) Place a paperclip at 0cm and slowly move the magnet from
10cm toward the magnet until the paperclip jumps to the magnet.
3) Complete 5 trials and record the distance where the magnet
is when the paper clip was attracted.
Distance
paper clip was attracted to magnet
|
||
Large
paper clip
|
Small
paper clip
|
|
Trial
1
|
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Trial
2
|
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Trial
3
|
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Trial
4
|
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Trial
5
|
||
Average
|
||
Connection to 6th Grade:
Explain why magnetism is considered a non-contact force?
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