science 3.0 Flashcards
A physical change is?
a change in appearance or state
Does a phys. change become a new substance?
NO, A PHYSICAL CHANGE IS NOT A NEW SUBSTANCE.
Chemical change is?
when two molecules produce 1 or more NEW substances in a chemical reaction.
chemical formula for hydrogen peroxide?
H2O2
what happens if you put hydrogen peroxide on a cut?
your cut will start to bubble
What is the Conservation of Mass?
in chemical change, no new mass was created, or no mass destroyed. It just gets moved to different places.
What do plants take in?
glucose and oxygen
Chemical formula for Methane?
Ch4
What is thermal energy?
Thermal energy (heat) is when T. Energy flows warm to cold.
Warm energy has?
fast particals
Cold energy has?
Slow particals
What is Oxidation?
Oxidation is a chemical reaction when an item is left outside for a while and changes.
Temperature is a measure of what?
How fast particles are moving.
Do cold particals have more or less energy of motion?
less.
Do warm particals have more or less energy of motion?
more.
