Your Favorite Drink (Soda, orange juice, lemonade, etc.)
Quart-size zip-lock bag
Gallon-size zip-lock bag
2 cups ice
1/4 cup salt
Fill the quart size bag with your favorite drink and zip it closed. HINT: Make sure the bag is zipped really good or your slushie will taste bad when some of the salt leaks into your bag. Put the quart size bag inside the gallon bag. Add the ice and salt to the gallon bag. Zip the gallon size bag closed. Now shake the bag a lot – even play catch with it…gently. In about 15 minutes you will feel the ingredients in the quart size bag starting to firm up. What started out as a liquid is changing to a solid. When it feels done take the quart size bag out of the gallon size bag. Rinse it off good in clean water. Then open the bag, squeeze the slushie into a glass and enjoy!
TIP: It’s OK for a dog to lick the ice, it won’t be in your drink anyway. Tip for the dog…lick the ice BEFORE the salt goes in!
And if you’re feeling like something with a few more ingredients, try this, ziploc bag ice cream!:
Your favorite drink is a liquid until it gets really cold. Your liquid drink would be pretty good with ice just floating in it…the ice cubes would make the drink colder…but the ice cubes would not make the drink freeze into a slushie.
Ice forms when the temperature of water is 32 degrees or colder. You don’t want the ice cubes to melt IN your drink, you want your DRINK to turn slushie. In order to make your drink turn slushie you have to get it really cold. Salt lowers the melting pointof water. To make a slushie you want the temperature around the bag of your favorite drink to be lower than 32 degrees so your drink will freeze. When you add salt to the ice cubes you lower the melting point of the ice cubes by several degrees. The ice cubes stay colder, longer – long enough to turn your drink slushie. Your salt/ice mixture will make your slushie faster than your freezer! That secret is the catalyst – the salt.
Science Experiment Idea: Make 3 different quart size bags each filled with the exact same amount of your favorite drink. Fill each of three gallon size bag with the exact same number of ice cubes. Add 1/8 cup of salt to the first gallon size bag and label it with a sharpie, “1/8”. Add 1/4 cup of salt to the second gallon size bag and label it “1/4”. Add 1/3 cup of salt to the third gallon size bag and label it “1/3”. Have a couple friends help you shake and smoosh the bags to make the slushies. Time how long it takes each of the bags to turn into a slushie. Which amount of salt makes a slushie the fastest?
Here are some websites and books that will help you understand the thermodynamics of slushies…and ice cream too!
Words to Know: Heat – To increase in temperature. Melting Point – The temperature at which a substance will change from a solid to a liquid. Thermodynamics – The study of the transfer of heat. Catalyst – Something that makes a change happen faster.
When you cut open an apple it doesn’t look good for very long does it? After even just a few minutes an apple can start to look brown inside. The apple turns brown because you cut the apple open and exposed what’s inside the apple skin to the air, which has oxygen in it. Oxidation is a chemical reaction that takes place when a substance combines with oxygen. When apple flesh combines with oxygen it turns brown. The browning of the apple is called oxidation.
Another kind of oxidation you probably have seen is rust. When metal comes in contact with oxygen a chemical reaction takes place – oxidation. In this case the result of oxidation is rust.
What You Need:
3 Apple Slices
1 Orange Slice
1/2 Cup Orange Juice
3 Small Plates
Carmel Dip and the Rest of the Apple Slices (optional)
Put one apple slice on each plate. One apple slice leave alone. Pour the orange juice over one apple slice, pour orange juice over one apple slice and lay the orange slice on top of the last apple slice. Wait a couple hours. How do the apple slices compare? Which one is the most brown?
Here are some websites and books to help you understand oxidation:
If you love airplanes, try out some of these paper creations. If you understand how the forces of aerodynamics work, you can make a plane that flies far. In The Kids’ Guide to Paper Airplanes the directions are really clear with color photographs to help you make the folds correctly. The planes start out easy and get harder and harder as you move through the book. The last plane requires 18 folds! The author even includes some tips for getting these planes to fly far.
What You Need:
Do you know why paper airplanes fly? They fly because of the forces that affect movement on earth. These forces are thrust, drag, lift and gravity.
Here are some websites that will help you understand aerodynamics and how to make good paper airplanes:
Science Rocks! Fly a Dart (page 52) and Fly a Glider (page 53)
Words to Know:
Lift– The force that is opposite the weight of an airplane and holds the airplane in the air. Drag – Air pushing back on the plane as it moves forward. Thrust – What makes the airplane move forward. This can be a propeller, a jet engine, or your throwing arm. Gravity – The force that pulls objects back to the earth. Aerodynamics – Aero means air and dynamics means motion. Aerodynamics is the study of motion through the air.
An insulatoris a substance that prevents the transfer of heator cold. Your winter hat is an insulator. It keeps the cold in the winter air from making your head cold. It blocks the transfer of cold from the air to you. It also blocks the transfer of heat from your head to the air.
Here is an experiment that will show you how different materials make better insulators than others.
What You Need:
3 Identical Coffee Mugs
4 Rubber Bands
Cotten Fabric (t-shirt – check the label)
Wrap the paper towel around the outside of one mug and secure it with a rubber band. Do the same with the other three mugs using alumninum foil, cotton and the wool sock.
Fill a pitcher with very hot tap water. Be careful! Take the temperature of the water and write the temperature down.
Fill each cup to the top with the hot tap water. Wait five minutes and take the temperature of the water in each cup. Make a chart to keep track of each cup’s temperature. Record each temperature after 5 minutes, 10 minutes and 15 minutes. What happens to the temperature of the water in each cup?
Here are some websites and books that will help you understand heat and insulators:
Words to Know: Insulator – A reduction of heat transfer between objects. Insulators keep cool things cool and warm things warm – like the thermos in your lunch box or the blubber on marine mammals. Heat – A high temperature. Temperature – The level of heat present in a substance or of an object or person. Temperature is measured on a thermometer and expressed in number of degrees. Temperature can also be determined by using the sense of touch. Human skin is sensitive to changes in temperature.
Animals on earth need a certain amount of heat to stay healthy and alive. How is it then, that animals like polar bars can survive in the arctic? How is it that whales can survive in the deep, freezing cold ocean? These animals have blubber, a layer of fat that acts as an insulator.
An insulator is a substance that prevents the transfer of heat or cold. The layer of blubber on a whale acts as a barrier to the cold of the ocean water. Because of its layer of blubber, the internal organs of the whale stay warm.
Your winter coat is an insulator. It keeps the cold in the winter air from making your body cold. It blocks the transfer of cold from the air to you. It also blocks the transfer of heat from your body to the air.
Here is an experiment that will show you how a simple insulator can make a big difference.
What You Need:
4 ziploc bags
Crisco Shortening or Vaseline
Fill a bowl with water and ice cubes. Put your hand inside one empty ziploc bag. Put that same hand with the bag on it inside a second ziploc bag. Now put your hand with the bags on it in the bowl of ice water. How long does it take for your hand to feel cold?
Ok, take your hand out of the bowl and take the bags off. Now fill one ziplic bag 1/2 full of Crisco or Vaseline. Put your hand inside one empty ziploc bag. Now put that same hand, with the bag on it, inside the bag full of Crisco or Vaseline. Squish the Crisco or Vaseline around so that it surrounds your hand. Now put your bag covered hand in the bowl of ice water. How long does it take for your hand to get cold?
The Crisco or Vaseline is an insulator, just like blubber. It stops the coldness of the ice water from transferring to your hand.
Words to Know: Insulator – A reduction of heat transfer between objects. Insulators keep cool things cool and warm things warm – like the thermos in your lunch box or the blubber on marine mammals. Heat – A high temperature. Blubber – A layer of fat that some animals have that helps keep the animals warm. Animals that have blubber include whales and sea lions, that live in the cold ocean and polar bears, that live in polar regions. Temperature – The level of heat present in a substance or of an object or person. Temperature is measured on a thermometer and expressed in number of degrees. Temperature can also be determined by using the sense of touch. Human skin is sensitive to changes in temperature.