Chemical Change
Give an example of chemical change.
Example answers: iron rusting, necklaces tarnishing, baking cookies, baking pancakes, wood rots, etc.
Whipping eggs, boiling water, dissolving sugar, and dicing vegetables are examples of what kind of change?
Physical Change
The ability of matter to combine chemically with other substances.
REACTIVITY
Give 3 examples of COLOR.
blue, red, green, yellow, purple, orange, etc.
Is Oobleck SOLID or LIQUID?
BOTH!
How many substances join to form new chemical properties?
Two or more.
Give 2 evidences of physical change.
Change in form, shape, size, or phase.
The ability of a chemical to burn or ignite or cause fire.
COMBUSTIBILITY or FLAMMABILITY
Is shredding paper a chemical change or a physical change?
Physical change
Give 1 example of physical change and 1 example of chemical change.
...
When a chemical reaction between substances gets heat, it is all because of what element?
Oxygen
What is one physical change that happens when a candle burns.
Wax melting, changing size/shape.
True or False: The ability of a substance can rot or decay back into the soil is biodegradability
TRUE
The exact temperature at which a liquid becomes a gas.
Boiling Point
Why is Oobleck both SOLID and LIQUID?
You can slowly dip your hand into it like a liquid, but if you squeeze or punch it, it will feel solid.
Is mixing water and sugar a chemical change or a physical change?
Physical. If you evaporate water, the sugar would still be left. It isn't a new substance.
What are the 3 main states of matter?
Solid, liquid, gas
Give an example of OXIDATION.
Rusting and tarnishing
Give an example of a change in size that is a physical change.
Example answer: Cutting a paper
What is the difference between a physical change and a chemical change?
Chemical change creates a new SUBSTANCE and physical change DOES NOT. Physical change is REVERSIBLE while chemical change is IRREVERSIBLE.
A chemical change is when bonds between atoms are broken and reformed to form what?
Form a NEW substance
Give 3 examples of a physical change.
Melting, boiling, evaporation, condensation, freezing, sublimation, deposition.
Oxidation, reactivity, flammability, biodegradability are what kind of properties?
Chemical Properties
Give 2 examples of physical properties.
COLOR, SIZE, TEXTURE, TEMPERATURE, MASS, VOLUME, DENSITY, HARDNESS, SHAPE
Physical or Chemical Change: Your friend decides to toast a piece of bread, but leaves it in the toaster too long. The bread is black and the kitchen is full of smoke.
CHEMICAL CHANGE