Fill out the chart below as we complete today’s demonstration:
Sink or Float Prediction
Floats
Candy Bar Type
Kit Kat
Floats
Sink or Float Result
Was your hypothesis correct? __Yes____ Why do you think the
demonstration turned out the way it did? Make sure to use the word
density in your answer. The sodas are both slightly more dense than water,
so they don’t have enough density to sink. Therefore they float in the water
at different levels, but not on top of the water.
3 Musketeer
If a can of regular coke and a can of diet coke of the same size and shape are
placed in a tank of water, then the diet coke can will float higher in the
water than the coke can since it has less sugar. They will be close to the
same density of water (both still float) since their main ingredient is water.
Sinks
Write a hypothesis as to what you think will happen to the same sized coke
and diet coke cans once placed in a tank of water. Remember to write it as
an “if….then….because” statement!
Snickers
dense than the duck?
Sinks
is floating and the nail has sunk to the bottom. What else is more
Milky Way
the plastic duck has less density than the iron nail. That is why the duck
Sinks
to something else is called relative density. In the picture to the below,
Twix
Whether something sinks or floats compared
Carmel and Peanuts must be more dense than the other ingredients.
Relative Density:
Solubility in Water: Solubility is the ability of a solid to dissolve
in a liquid. To dissolve means to spread out evenly in the liquid.
Because sugar and salt both dissolve in water, they are
classified as water soluble. Many solids, such as sand and iron
filings, are not water soluble.
Magnetism: Magnetism is a physical property of some metals, such as
iron. A magnet may attract, or pull, objects made of those metals toward it
and may even pick up some of them. Not all metals are magnetic.
Aluminum, copper, tin, and gold are not attracted to magnets. Nonmetals— such as plastic, wood, and paper—are also not attracted to
magnets.
Using the magnet kit given to your group, carefully remove the bar magnets
and try putting like poles together. What happens? They Repel
Now put opposite poles of the bar magnets together. What happens?
They Attract
Sometimes you can increase the speed at which a substance
dissolves or the amount of the substance dissolved by
increasing the temperature.
Predict whether each solid in the chart below will produce a
solution or not when added to water.
Solid
Prediction – Will it
become a solution?
Sugar
Iron Filings
Sand
Detergent
Result - Did it
become a solution?
Yes
No
No
Yes
Predict whether each liquid in the chart below will produce a
solution or not when added to water.
Now take two of the red ring magnets from the kit. Place them together so
that they are attracted to each other. Then place your wooden
(nonmagnetic) rod through the magnets. Carefully flip one of the magnets
over and observe the magnets repel one another. Can you make one of
them hover in the air?
Now use the horseshoe magnet to test the magnetic properties of the 4
metal samples in your kit.
Is Aluminum (Al) magnetic? NO
Is Iron (Fe) magnetic? YES
Is Zinc (Zn) magnetic? NO
Is Copper (Cu) magnetic? NO
What are the 3 most magnetic substances (metals) on earth?
Liquid
Rubbing Alcohol
Cooking Oil
Vinegar
Glycerin
Prediction – Will it
become a solution?
Result - Did it
become a solution?
Yes
No
Yes
No
***Iron Nickel and Cobalt are the 3 most magnetic substances.***
Check out the lodestone in the center of your kit. This naturally occurring
mineral was used by medieval Chinese navigators as a compass by
magnetizing a needle and floating it in water or hanging the stones from a
string! --- Now please clean up your kit and make sure everything is in the
correct place!
The Ability to Conduct or Insulate Thermal Energy or
Electric Energy:
Materials that allow energy to pass through them easily are
called conductors. Many metals—including copper, iron, and
aluminum—are good conductors of both thermal and electrical
energy. Pots and pans are usually made of metal because they
conduct thermal energy well. Wires used in circuits are
generally made of copper because it is a good conductor of
electric energy. Insulators are materials that slow or stop the
flow of energy. Wood, plastic, and fabric are good insulators of
both thermal and electric energy.
Circle the conductors below – Put an X over the Insulators
Using the website below complete both a series circuit and a parallel circuit
following your teachers instructions:
http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc