Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/41

Click to flip

41 Cards in this Set

  • Front
  • Back
molecule
two or more atoms chemically joined
element
substance consisting of only one type of atom
physical property
property measured without changing the matter
solid
state of matter with the lowest amount of energy
compound
two or more elements chemically combined
plasma
extremely high energy, where nuclei of atoms are split
atom
smallest unit of matter
chemical property
property observed by changing the idenityt of matter
gas
state of matter where atoms are as spread out as possible
liquid
the state of matter where atoms are tightly packed but are moving
covalent bond
hold together atoms that share electrons
how many natural elements?
90
how many elements are necessary to life?
25
neutrons
in nucleus (neutral charge)
# of neutrons is atomic mass- atomic number
protons
in nucleus (positive charge)
atomic number
electrons
orbit nucleus in orbitals (negative charge)
atomic number
isotope
atoms of the same element with different number of neutrons
ionic
transfer of electrons from one atom to another
produces ions
ions
charged particles
cations
positively charged
anions
negatively charged
reactants
chemicals mixed in a reaction
products
new chemicals formed in a reaction
hydrogen bonds
-attraction of opposite charges between hydrogen and oxygen
-weak bonds
-help hold large molecules together
-gives water its unique properties like cohesion and adhesion
cohesion
high surface tension
adhesion
capillary action- thin tubes
why ice floats
less dense when frozen
high specific heat
resists temperature change
evaporation
very slow
type of molecule for water
polar covalent
polarity
makes it a good solvent, dissolves substances and forms acids and bases
mixture
two or more elements/ compounds evenly distributed but not chemically combined
homogeneous
mixture that doesn't show identity of its compounds
heterogeneous
mixture that shows identity of its compounds
solution
uniformly dissolved, usually see through (homogeneous)
suspension
large clumps of molecules floating/ suspended in a liquid
solute
substance being dissolved
solvent
substance doing the dissolving
dissociate
when ionic compounds dissolve in water ions dissociate
acids: taste
form what ions?
have what pH?
-sour
-form hydrogen ions (H+)
-have pH below 7
bases: taste
form what ions?
have what pH?
-bitter, feel slippery
-form hydroxide ions (OH-)
-have pH above 7