Ice-cream in a bag

Here’s another Kitchen Science experiment – ice cream in a bag. You can easily get ingredients needed for this activity and with easy steps that kids can do it without making a mess (just make sure the ziplock bags are tightly sealed! and double ziplocked if you’re really worried). It’s also quick so kids won’t get impatient with it. The best part? It’s yummy and you can create your own flavour!

Ingredients:
-1/2 cup heavy cream (whipping cream)
– 1/2 cup milk
– 1/4 cup sugar
– 1/4 teaspoon vanilla extract
– 6 tablespoons salt
– ice cubes, enough to half-fill a large plastic container. (crushed ice preferred over ice cubes as it has larger surface area)

Materials:
– Large plastic container
– 2 pcs large zipper-lock bags
– Towel or mittens

Steps:
1. Add heavy cream, milk , sugar and vanilla in a container. Stir well.
2. Transfer the content into a zipper-lock bag.
3. Seal the zipper-lock bag tightly.
4. Place it into the other zipper-lock bag. Seal it tightly.
5. Add crushed ice into the large plastic container until it’s half filled.
6. Add 6 tablespoons rock salt.
7. Place the zipper-lock bag in the container. Seal it.
8. Shake and roll it for 10-15 minutes.

 

Science notes
Possible science topics that you can explore with your child through this activity are state of matter and changes in state. Below are possible questions you can discuss with your child.

  • Is ice-cream a solid or liquid? Is it simply frozen ice-cream is solid and melted ice-cream a liquid? Frozen ice-cream is actually a mixture of different states of matter! This website by American Chemical Society explains the state of matter of ice cream for young children.
  • What is the change of state observed? Quite a few changes of state take place in this activity! Th obvious ones are change of state from liquid to solid (milk to ice crystals) in the first bag and change of state from solid to liquid in the plastic container. Probe your child to observe the water droplets in the second bag after the shaking and rolling as most might missed this. The bag is empty, so how do water vapour appear in the bag? This is another change of state, from gas to liquid.
  • Why is salt added to the ice? The dairy mixture need to be colder than ice to freeze. The salt added to ice lowers the melting point of ice. This makes the ice colder than it was before, to even below 0 degrees Celsius, hence increases the freezing rate of the diary mixture.

Extension

Another possible extension to explore this property of salt is to compare the freezing rate or melting of ice in normal water and in salt water.

Lastly, some videos to support your child’s learning in the topics mentioned above.

 

5 Science-based activities after a trip to the park

Pick up a few pieces of different types of leaves the next time you’re out at the park. Let your children be budding botanists as they explore the leaves.

1. Parts of a leaf
Equip them with magnifying glass to observe the parts of the leaf. Let them draw or trace the outline of leaf on blank piece of paper. Then, label the parts of the leaf.

Credits: Adaycare.com

This can also be done by colouring only certain parts, as shown in the diagram below.

Credits: A2Z Montessori

2. Classification and sorting
Let your children sort the leaves collected, for example by colour, size, vein pattern, texture, margin pattern etc.

Garden Notes from Colorado State University Extension has comprehensive details on leaflet arrangement, venation, leaf shape, leaf structure etc if you would like to describe more to your children.

3. Leaf printing
Simple craft with leaf printing. The end product can be framed, used as bookmark or even as wrapping paper.

Here’s another idea for leaf print activity, Leaf Prints Tree.
Credits: First Pallette

Credits: First Pallette

4. Hammered Leaf
Another craft activity, but this is to preserve the natural dye of the leaves on paper. Taken from Instructables.com.

Things you’ll need:
– flowers or leaves to print
– watercolor paper
– selection of hammers (including ball-peen or cross-peen, if you have them)
– hard work surface (cutting board, slab of wood, etc.)
– paper towels
– scissors
– a pen
– tweezers or toothpicks
– tape (optional)
– acrylic finishing spray (optional)

Trim any chunky or squishy bits off of the plants and arrange them on the watercolor paper. You can tape them down if you would like, but make sure that the tape doesn’t get between the plant and the paper.
Cover the plant with 2-3 layers of paper towels. On the paper towels, sketch the borders of the area you’ll need to hammer.
Start by making small, even taps using the flat side of one of the hammers. This will set the flowers or leaves in place. Then go carefully over the entire area with a ball- or cross-peen hammer. Start by going in rows up and down (see the arrows in the previous picture), then do another pass from side to side. You’ll need to hit every single bit of the plant, so be patient. It can take a while.
Peel back the paper towel to check your progress. If the pattern on the towel is filled in, then you’re probably done. If not, replace the paper towel and start again. When you’re done, peel away the leaf to reveal the print. If it sticks to the paper, just let it dry for a bit and you’ll be able to brush it off.
Once your print is to your liking, you can spray it with UV-protective acrylic spray to help keep the colors bright. Be sure to do this in a well-ventilated area.

5. Extract chlorophyll from leaf
Taken from eHOW:

Things you’ll need:
Hot water
Large green leaf
Rubbing alcohol
Glass container

Place the leaf in boiling water for 2 minutes. Then, remove the leaf.
Place a heat-safe glass container in the a pot of hot water. Pour 1 cup of rubbing alcohol in the glass container.
Place the leaf in the glass with the rubbing alcohol. Ensure that it is fully submerged.
After an hour, the rubbing alcohol will turn green due to the chlorophyll.

3 simple experiments you can do with Milk

Milk is not just a drink for breakfast or at night before sleeping. Here are some simple experiments with milk. Watch as it changes colour or form when you add different reagents into it.

Some of the reagents needed are detergent, food colouring, vinegar or coke – stuff that you would most likely already have in your kitchen. So, what are you waiting for?

1. Milk with coke

This is a good activity to read up on what is milk made up of and acidic properties of coke. Parents can also extend discussion by allowing children to think about effects of drinking coke for those with Osteoporosis.

You can also repeat the experiment with different types of milk.

Reaction of coke with different type of milk. (Source: Steve Spangler Science)

2. Milk with vinegar

Let your child make plastic in this simple experiment.

3. Milk with soap/detergent and food colouring/dye

Incorporate art into science experiment with this activity.

The end product can also be used as gift wrapper, bookmark, thank you notes, cards etc. (Source: Babble Dabble Do)

Watch how you can make those too…