Science Test 11/8/23 Flashcards
Atom
Smallest unit of matter.
Element
Cannot be broken down by chemical means.
Matter
Physical substance that has mass and occupies space (volume).
Molecule
2 or more of the same atoms held together by a chemical bond.
Compound
2 or more different atoms held together by a chemical bond.
How are molecules different from compounds?
Compounds have different atoms.
How do you tell if it is a molecule or compound?
Compounds have different atoms, molecules have the same.
How is an element different from an atom?
Atoms are the smallest unit of matter, one isn’t.
How is an element different from a compound?
Elements cannot be broken down by chemical means, compounds aren’t.
How are atoms arranged in a solid?
Molecules are packed together (fixed volume).
How are atoms arranged in a liquid?
Slightly packed together - less than a solid (fixed volume).
How are atoms arranged in gas?
Molecules are spread out (not fixed volume).
How do atoms move in solids?
They don’t really move.
How do atoms move in liquids?
They move a little.
How do atoms move in gas?
They move a lot.
Describe melting.
Phase change from solid to liquid.
Describe freezing.
Phase change from liquid to solid.
Vaporization
Phase change from liquid to gas.
Evaporation
Phase change from liquid to gas on the surface of a liquid.
Condensation
Phase change from gas to liquid.
Sublimation
Phase change from solid to gas.
Deposition
Phase change from gas to solid.
How can you identify a compound?
2 different capital letter.
How can you identify an element?
1 capital letter.
