Mod 3&4 Flashcards
A pure substance that cannot be broken down by ordinary chemical means
Element
Specific version of an element with: Different mass numbers and neutrons Same protons Carbon-12 (6 pro + 6 neu) Carbon-14 (6 pro + 8 neu)
Isotopes
PET Scan
Position Emission Tomography
Radioisotopes in medicine
Neuron splits into a proton and electron
What determines whether atoms will interact?
The number and arrangement of their electrons
Atoms’ number of electrons on lower and subsequent shells
2 on lower, 8 on rest
Two or more atoms joined by strong bonds
Molecules
Two or more atoms of different elements joined by strong or weak bonds
H2= molecule
H2O= molecule and compound
compounds
Atoms share a pair or pairs of electrons to fill outermost shell.
Covalent Bonds
Types of covalent bonds
polar- unequal sharing, more time near nucleus than most protons. More attracted to O than H.
nonpolar- Atoms share e- equally. Same number of protons
Hydrogen bonds
Bonds between adjacent molecules (not atoms). Between H2O molecules cause surface tension
State of matter that has constant volume and shape
Solid
State of matter that has constant volume but changes shape
Liquid
State of matter that changes volume and shape
gas
Reactant?
Materials going into a reaction
Product?
Materials coming out of a reaction
Metabolism?
Many reaction occurring at one time
Work?
Change in mass or distance
Energy?
The power to do work
Kinetic energy?
Energy of motion
Potential energy?
Stored energy
Chemical energy?
Potential energy store in chemical bonds
Water accounts for how much of our body weight?
2/3
Solution?
Mix of 2 or more substances
Solution=solute+solvent
