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Christmas Candy and Phase Changes

12/30/2018

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Author: Maddie Van Beek

​Today, we're going to use our Christmas candy to learn about phase changes! 


Why do things melt? 


Melting is actually a scientific process called a "phase transition." There are three different physical phases of matter: solid, liquid, and gas. 


Every item you see around you is made up of molecules. Molecules are the building blocks of everything! However, the structures that molecules form are not necessarily permanent; they can undergo physical or chemical changes. Let’s explore this: 


Grab a handful of gumdrops and make a square. Pack them as closely together as possible in neat lines. This is what the molecules in a solid phase object look like. The molecules are in a nice, tight order, and can hardly move. If a solid is heated, the molecules start to shift. 


The next phase is liquid. Move the gumdrops a little further apart from one another. They might not be in straight lines, but they are still fairly close together. Liquids can move and shift and change shape, but the molecules still sort of stay together. Picture an ice cube left out in the sun. After a short amount of time, the ice begins to melt. Ice melts at 32 degrees Fahrenheit, but every substance melts at a different temperature. The point at which a solid changes to a liquid is called the melting point. Even rocks can melt if they are heated to a high enough temperature! 


Heat a liquid even more, and the phase changes from liquid to a gas. Move your gumdrops even further apart from each other. They don't need to be in any sort of pattern at all. When a substance is in the gas phase, the molecules can spread apart and fill a whole room! For example, when water is heated, it evaporates into the air! What's another gas you can think of? 


Recap: 
Now you know the three physical phases: solids, liquids, and gases. Heat causes a phase change from solid to liquid, or from liquid to gas. Every substance has a different melting point, the point at which a solid changes to a liquid. Why do some objects not melt at all? 


Some substances, when heated, will combust (burn) before they ever melt. Instead of staying solid until they reach their melting points, they react with oxygen and burn instead. This reaction is a chemical change. For example, if you burn a piece of paper, it changes form from paper to ashes. This chemical change is irreversible; you cannot change ashes back to paper. 


Make a list of items you think would melt, like a plastic toy, and a list of items you think would burn, like a piece of paper. 


Recap: 
Items that melt, like ice melts into water, are undergoing physical phase changes. 


Items that burn, like paper or wood, are undergoing a chemical change. 


Now, let's start our experiment! 


YOU WILL NEED: 
A variety of Christmas candy
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-Candy Cane 
-Chocolate 
-Peppermint Oreo 
-Gumdrops 
-Stove 
-Saucepan 
-Paper and pencil 


Here's what to do! 
1. Make a list of the Christmas candy you have. 
2. Next to the name of the candy, draw an X if you think it will melt. Draw a circle if you don't think it will melt. 
3. Now, number the items from 1-4 based on which you think will melt first to last (1 is fastest, 4 is slowest). 
4. Place the saucepan on the stove, and turn the heat to medium-low. 
5. Place the unwrapped candy cane in the center of the saucepan. 
6. Time how long it takes for the candy cane to start melting. Record what you find. 
7. Carefully rinse out your saucepan with cool water, and wipe clean. 
8. Place the saucepan on the stove, and repeat the process with the Oreo, the chocolate, and the gumdrops. 
9. Compare your results to your guesses. 
10. So, which item has the lowest melting point? Which one has the highest melting point? 
Results: 
The Oreo was the same from 0-10 minutes. The frosting softened, but the cookie remained unchanged.
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The candy cane began to noticeably melt after about 4 minutes and fully melted after another two minutes.
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The chocolate started to melt in less than two minutes and was fully melted after 2 min.
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The gumdrops took the longest, by far! They started to melt after about 7 minutes. They were melting much more noticeably after about 10 minutes.
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Make window decorations by melting gumdrops and candy canes! 
1. Preheat the oven to 400 degrees Fahrenheit. 
2. Cover a baking sheet with tin foil. 
3. Place a cookie cutter on the tin foil. 
4. Fill the cookie cutter with gumdrops. Be as creative with your design as you wish, but make sure to pack them tightly so there isn’t any space in between the gumdrops.
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5. Place your design in the oven, and check every five minutes. It should take about 15 minutes to melt together.
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6. Remove from the oven, and let cool. Carefully remove your gumdrop design! You may need to use a butter knife to help loosen the corners. 
7. Repeat with crushed candy cane or hard candy for a stained glass look! For the candy cane, reduce the temperature to 350 degrees, and it should only take 7 minutes to melt (check every minute after 5 minutes). It is difficult to remove the 
design from the cookie cutter once it solidifies, so don’t worry if it breaks. It still looks like cool stained glass! (You could also try lining the inside of the cookie cutter with tin foil to make it easier to remove the shape.)
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Sedimentary Rock Bars

12/13/2018

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Author: Maddie Van Beek

​Today, we’re going to learn about sedimentary rocks!
There are three main types of rocks: igneous, metamorphic, and sedimentary.


Igneous rocks are: formed from magma or lava and are found at the Earth’s crust.
Metamorphic rocks are: formed from high temperature and/or high pressure.
A metamorphic rock is created by changing or “morphing” another existing rock into something new.
Sedimentary rocks are: formed from layers of sediments at the Earth’s surface. This is what we are focusing on today!


Think about the word sediment… does it mean anything to you? Brainstorm what sediment might mean or what the word sediment reminds you of.


Sedimentary rocks are formed over time at the Earth’s surface by a variety of processes (air, ice, water, wind, and/or gravity). You might find sedimentary rocks close to the ocean, for example. Waves and bodies of water cause different materials to wash ashore and form layers and layers of deposited particles. As layers are added, pressure increases. Over time, these layers get compressed from loose sand, pebbles, minerals, or seashells into hard layers of rock. When rocks form this way, it's called lithification.
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These rocks are along Mystic Beach near Sooke, British Columbia.
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When the tide is high, it coves the beach completely and reaches all the way to the rocks.
Think about it, which layers of sedimentary rock are the oldest? How do you know?


Which layers are the newest? Why?


When you see sedimentary rocks, you may notice different textures and colors. This is because they have been formed over a long period of time from many different materials.
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These rocks are along Monterey Bay at Point Lobos in Carmel, California.
Now that you know what sedimentary rocks are and how they form, we’re going to form our own EDIBLE sedimentary rock bars!


YOU WILL NEED:
* Butter
* Marshmallows
* Puffed rice or rice crisp cereal
* Caramel or chocolate chips
* Toppings (any kind of candy, chocolate or popcorn will do)
* Rubber spatula
* Baking Pan
* Saucepan


Here’s what to do!
1. Melt 2 tablespoons of butter in a saucepan over low heat.
2. Add 2 cups of marshmallows and stir over low heat until the butter and marshmallows form a fluffy sauce.
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3. Remove the melted marshmallow from the stovetop and add 2 cups of puffed rice cereal (or whatever cereal you choose to add).
4. Spread your first layer of marshmallow cereal into the baking pan. Pack it down! Remember, this is your oldest sedimentary layer, so it should be very firm since it’s been under all that pressure!
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5. Next, add a layer of caramel sauce. Spread it evenly over the marshmallow layer.
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6. Now, sprinkle puffed rice over the caramel and press it all in! This layer is probably not packed down as much as your bottom layer, but should still be pretty stuck in there.
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7. Melt about ½ cup of chocolate chips in the microwave OR use 4 tablespoons of coconut oil and 4 tablespoons of cocoa powder. Either will work! Microwave for 30 seconds at a time, stirring in between until you have liquid chocolate. Drizzle the chocolate sauce over the puffed rice layer and then spread it over evenly with the spatula.
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​8. Finally, add your toppings! These toppings are probably the largest pieces and the least packed down. You can use M&Ms, a crushed candy bar, or popcorn! Use your imagination and your resources!
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9. Refrigerate your sedimentary rock bars for at least 20 minutes to solidify.
10. Cut your bars apart and enjoy! Make sure to pay attention to all the different layers you’ve created!
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