Topic 1 Flashcards
(27 cards)
composed of only one type of atom
elements
examples of elements
aluminum, gold, oxygen (pretty much anything on the periodic table I think)
2 or more atoms held together by chemical bonds
molecules
substances made of 2 or more elements that are chemically bondnd in a set ratio
compounds
heterogenous mixture —–
mixed together, seee specific parts
heterogenous examples —–
salsa, soup, cereal
homogenous examples ——
water, flour, drinks
homogenous ——-
very hard/impossible to tell the difference between parts
quality of something to be shaped without breaking (hitting a metal sheet)
malleable
mass of a material in a given volume
density
fluids (gas/liq.) resistance to change into shape or movements
viscolotitity
resistance to permanent indintation
hardness
ability to sustain intense plastic deformation
ductile
diff. between chemical and physical properties
physical can be seen without changing the composition / substance
distillation —–
separating liquid by boiling them
measure of how quickly something will be caught on fire
flammability
ability to undergo a chemical change
reactiviness
ways to identify a chemical change (4)
- color change
- release of gas
- release of light, sound, heat
- formation of a percipitant
how does temp. change density
temp up dense down
temp down dense up
what’s the dentist will water gets (at which temp)
4 degrees then starts going down again
elements are identified by —–
letter symbole on periodic table
positive center surrounded by neutrons
atom
molecular are made of non-metals or metals
non-metals
way a substance reacts with oxygen
flammability
