Vocabulary
A chemical change is...
A change that produces one or more new substances.
A physical change that I see every day with food is...
Cut up fruit
sliced pizza
broken glass
True or False
Particles rearrange to form new substances in a PHYSICAL CHANGE
FALSE
What is the law of conservation of matter?
This law states that with any change, the mass of an object stays the same.
Conservation of matter says...
No matter what type of change happens, the mass DOES NOT CHANGE.
A rusted nail is a chemical change because...
Iron and Oxygen are combining to produce a chemical change called rust
What is one way to tell when a chemical change has occurred?
Change of color
New smell
Heating an object
Gas bubbles
Some of the particles of a substance leak out where a chemical reaction has taken place. How will this affect the mass?
The mass will be less than the combined masses of the ingredients.
When one or more substances change into new substances.
Baking a cake is a chemical change because...
We are baking it (heating it)
Liquid to a solid
changes color
produces a new substance
True or False
Particles connect together like legos.
TRUE
How could you set up an experiment to test the law of conservation?
Students must explain ways to measure the mass before and after the combining the substances.
A physical change is difference from a chemical change because...
A physical change is only a change in size or shape, NOT THE SUBSTANCE.
How would you describe what happens when you are baking a cake?
We are turning the ingredients into some thing new. The ingredients are mixed, heated and something new is produced.
How do we create new substances using building blocks?
We can put different particles together.
In a physical change, is the mass the same between two object before and after the change? Why?
Yes, the mass doesn't change no matter what the change is.
An example of a Physical and Chemical change is...
Physical: broken glass, torn paper, cracking an egg, chewed gum, broken rock
Chemical- burning a marshmallow, baking a cake, frying an egg, making popcorn
List 3 different chemical changes that happen around you.
Home
School
Neighborhood
Home-
Baking cake, popping popcorn, cooking an egg
School- food spoiling, mixing baking soda with vinegar in a science experiment, rust forming on metal objects
Neighborhood- Burning wood, Digesting food, burning a candle
Give an example of a chemical change where the particles rearrange themselves and become something new.
Baking brownies
Baking a cake
Explain what you think will happen to the mass when you mix ingredients together to make modeling dough.
Mixing the ingredients will have NO EFFECT ON THE MASS because the mass does not change in a chemical or physical change.