basics
What is a scientific theory?
a well-test explanation for a phenomenon
Convert 811 ml to L
.811 L
what is atomic number?
number of protons
What is an independent variable?
the variable the experimenter changes
what is a period?
row across the periodic table (horizontal)
Give an example of something that is not matter
energy, ideas, space, etc
Convert 562 km to m
562,000 m
What is atomic mass
protons + neutrons
What is the octet rule?
need 8 valance electrons for stability
what is a dipole?
A partial charge across a molecule
What state of matter has a definite volume but indefinite shape?
Liquid
Convert to scientific notation: 85,000
8.5 x 104
How is the modern periodic table organized?
By increasing atomic number
What is the electron configuration of Ne?
1s2 2s2 2p6
What is a transition metal?
Metal that can have different numbers of valence electrons (groups 3-12)
Describe a physical change
varies
Convert to regular notation: 7.23 x 10-2
.0723
Which element has a larger radius? K, Se, or N?
K
What is a covalent bond?
shared electrons between nonmetals
What is electronegativity?
how much an atom wants electrons in a compound
Give the chemical symbol for Tungston
W
How many sig figs? 90120
4
How many valance electrons does Sodium have?
1
What happens to valance electrons in metals?
they are free to move from one atom to another
What is a photon?
discrete bundle of electromagnetic energy