This is … because you start out with seeds and then when you add oil or sometimes butter and expose the butter or oil and corn seeds to heat the substances will combine and with the heat create popcorn. Examples include curing Pork to make ham and bacon, turning apples into applesauce or cider, and squeezing oranges for orange juice. When the cream is vigorously mixed or shaken the fat molecules begin clumping together thickening the once liquid cream into the solid state of whipping cream. Anything changing from a solid to a liquid or liquid to solid , or from a liquid to gas or gas to liquid is a physical change. During pasteurization, milk or another liquid is heated to destroy microorganisms. Station 7 graduated cylinder, clear plastic cups, cup of vinegar, and cup of milk Changes that occurred in the stations were: Physical changes: Station 1: Blowing up and popping a balloon; Station 4: Forming clay into different shapes Chemical changes Station 2: Vinegar and baking soda reaction gas bubbles produced ; Station 3: Souring milk change in odor ; Station 5: Rusted steel wool change in color ; Station 6: Cream of tartar and water reaction change in temperature ; Station 7: Vinegar and milk reaction precipitate formed Day 2: Explain differences between physical and chemical changes read from the article. Encourage them to include detailed answers.
Make a list on the board. Although we drink fluid milk, the majority of milk produced is actually used to make dairy products such as yogurt, cheese, butter, ice cream, etc. Which are physical and which are chemical changes? Adequate calcium in our diet for healthy bones and teeth is only valuable when accompanied with vitamin D. Therefore, since the substance still remains to be H 2 O, it is considered to undergo a physical change. You may lead the discussion or have each team present the facts for their dairy product to the class. You can give them this list and they can decide which ones go on their menu or they can brainstorm ideas with the class or on their own. The water can be refrozen into ice again, because it is the same chemical compound, H 2 O.
In the United States, goats only provide a very small portion of milk for specialty markets. Place in groups and provide a box of just add water pancake mix, measuring cup, bowl and spoon or whisk and water and forks to eat the pancakes. Use the definition found in the vocabulary section of this lesson to define the difference between a physical and chemical change. Neither one have changed their chemical characteristics like color or odor but they have changed their physical appearance by changing into a different form of matter. I will be teaching this activity to 2nd and 3rd graders. . To answer this question, your students must know a little more about how dairy products are made.
Pasteurization has proven effective in minimizing bacteria that causes illness. It is always present, but in a different form. For C, butter can turn into a solid again if we cool it down below it's melting point. Because only its appearance changed, not what it is If you plaster it back its original form,it'll harden and be the same. Science plays a vital role in agriculture as our food is produced on the farm and processed pasteurized for our use.
Some examples of physical change include ice melting, alcohol evaporating, iron rusting and salt water. You can list all these on a page and they can decide which ones would go on their menu. Liquid water and ice frozen water are both the same substance, water. A change of phase is a type of physical change. Once milk is pasteurized and homogenized it can be used to make many different food products. Concrete is a mixture of cement and crushed rock. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk.
Chemical changes: burning wood for a fire, and cooking the pancake. An electric frying pan will be needed along with pancake batter, cream to make into butter, jars, and the book Pancakes, Pancakes! Food processing is a benefit to consumers. Unlike hard cheeses, the cheese curds remain loose and are mixed with the whey liquid portion to create cottage cheese. Give examples such as pork being cured to make ham or bacon, apples being made into applesauce or apple juice, etc. Melted butter has different chemical properties than solid butter.
Context for Use Context This activity will take at least 4 class periods. Learning Goals Learning Goals This activity is designed for students to investigate, make observations and describe chemical and physical changes. Each process requires milk to undergo a physical or a chemical change. Milk processing is also a benefit to many individuals with lactose intolerance. Milk processing increases the usefulness of milk as well as the demand, or need for milk.
On the menus the students will draw pictures of the batter before and after it is cooked and explain why cooking pancakes is a chemical change. You may start with two colorless solutions but when they are mixed you might see a bright purple color. If a certain mixture is homogeneous, you would properly conclude that the physical properties and the composition: a. You will need to talk about safety issues with the cream in jars. Milk: The Scoop on Chemical and Physical Changes Milk: The Scoop on Chemical and Physical Changes Grade Level s 9 - 12 Estimated Time 1 hour Purpose In this lesson students apply their knowledge of physical science to dairy products to determine if the changes that take place when turning milk into cheese, butter, yogurt, ice cream, whip cream and other dairy products, is a physical or chemical change.
It is easy to differentiate between a physical and chemical change. Once melted the fats separate from the milk solids. You still have salt and you still have water. It's chemical make up remains the same. Please take a minute to tell us how to make this lesson better or to give us a few gold stars! Have them raise their hand when they hear an example.
Also, when it cures it forms discrete mineral phases, which gives strength to the concrete. These diseases were especially devastating to young children and infants. This is a great discussion for students as I've found that all scientists don't agree. How many dairy products can your students name? The question explicitly uses the concept of burning, so answering this one as both a physical and a chemical change if asked on a test would probably garner partial credit. This is a physical change, not a chemical change! Caution them not to shake too hard or the jar may break.