Show:
Mixtures
Physical Changes
Chemical Changes
Mixture or Solution?
Physical or Chemical Change?
100
What is a mixture?
A mixture is two or more kinds of matter placed together. Mixtures can be separated!
100
Describe how a sculptor carving a rock causes a physical change.
He is changing the way the rock looks, but the rock is still a rock when it is separated from the big rock.
100
What is a chemical change?
When one kids of matter changes into a different kind of matter.
100
Kool-aid
Solution. There are two or more substances mixed together and the mix dissolves.
100
Cutting Fruit
Physical change
200
True or false? A solution is a mixture.
True.
200
Name the three different states of matter.
Solid, liquid, gas.
200
Which is an example of a quick chemical change? a. A wooden log burning on a fire b. A old car rusting in spot
Wood burning. It will happen in minutes.
200
A salad with lots of veggies in it.
Mixture. They can be separated and nothing dissolves.
200
Water being frozen into ice
Physical change
300
What is a solution?
A solution is type of mixture that forms when one substance DISSOLVES in another.
300
What is a physical change?
A physical change happens when the appearance of matter changes, but the substance stays the same.
300
Name two ways that people use chemical changes in their everyday lives.
1. Gas in their cars 2. Cheese- milk turns into cheese 3. Batteries- the chemicals release energy when mixed 4. Food being digested- gives us energy! 5. Laundry soap with stain remover- breaks down stains.
300
Pop or soda.
Solution. Carbon dioxide and other sweeteners with water.
300
A fried egg
Chemical change
400
True or False? It is possible to separate a solution.
True! It is a type of mixture, so it can be separated.
400
Describe the physical changes that happened when we made Kool-aid in class.
The color changed, the Kool-aid mix and the sugar dissolved.
400
Explain why cutting wood is a physical change, but burning wood is a chemical change.
Cutting wood changes the form and size of the wood, but it is still the same matter. Burning a piece of wood changes the matter itself. You can never get that original wood back!
400
Saltwater.
Solution. The water and the salt can be separated by boiling the water, or letting it evaporate.
400
Mixing salt into water to form saltwater
Physical change. The water and the salt are still there and they can be separated by boiling it or letting the water evaporate.
500
Name at least two out of the three ways we separated our mixture in our lab with the water, salt, sand and rocks.
1. We strained out the rocks and large pebbles in the sad. 2. We filtered out the sand with a coffee filter. 3. We let the water evaporate and the salt stayed behind.
500
Describe the difference between a physical change and a chemical change.
A chemical change forms new matter. Physical changes just change the way it looks.
500
Explain how chemical changes help you use a cell phone.
The chemicals in the battery combine to from new substances. The chemical changes release energy for the cell phone.
500
Trail Mix with peanuts, raisins, almonds, m&m's and sunflower seeds.
Mixture.
500
Baking cookie batter to make cookies.
Chemical change. The new matter can never go back to it's original form, the dough.