Changes
Is baking bread a physical or chemical change?
Baking bread is a chemical change
Name the three states of matter.
Solid, liquid, and gas
What is a mixture?
The combination of 2 or more things that are not chemically combined and/or can be separated back into the components
Can you see atoms?
No! They are very small.
Which are easier to separate: mixtures or solutions?
Mixtures
Name 2 physical changes in cooking?
cooking pasta
chopping
rolling out dough
melting butter (or anything for that matter)
dissolving a solid into a liquid
What is water called when it is a solid?
Ice
What kind of mixture IS NOT the same throughout?
Heterogenous mixture
What is all matter made of?
Atoms!
What is an example of a mixture in cooking (food)?
salad
kool-aid
yogurt with granola
more....
Explain the difference between a physical and a chemical change.
A physical change doesn't change the matter's properties, while a chemical change creates a new substance.
Which state of matter has particles that are very close together and vibrate in place?
Solid.
What kind of mixture IS the same throughout?
Homogenous mixture
Name one of the 3 parts of an atom
Electron, proton or neutron
What is the pH of an acid?
0 to 7 or less than 7 (must be this sort of answer, not a specific number)
TRUE or FALSE: If you let the ice in a glass full of ice water melt, the glass will overflow.
Explain your reasoning!
False - the volume will remain the same - Law of Conservation of Matter - cannot create or destroy matter.
Which state of matter has particles that are very far apart with no defined shape or volume?
Gas
Gels, sols and emulsions are this kind of homogenous mixture.
colloid
Name the two parts of an atom that are found in the nucleus.
The two parts are protons and neutrons.
What is dihydrogen monoxide?
Water
What is the scientific law that says that atoms are not created or destroyed during chemical reactions?
The Law of Conservation of Mass
What do you call it when a gas turns into a liquid?
Condensation
What kind of mixture is an alloy (two metals) - heterogenous or homogenous?
Homogenous
What is the charge of an electron, proton and neutron?
electron = negative
proton = positive
neutron = no charge
Explain the difference between molecules and compounds.
Molecules have more than one atom, while compounds specifically have more than one kind of element.