Sophmore Flashcards
1
Q
Atoms
A
About 100 kinds
2
Q
Diatomic elements
A
Hydrogen, oxygen, etc.
3
Q
Compound
A
Material made up of 2 or more kinds of atoms in constant proportions
4
Q
Pure substances
A
Formula can be written
5
Q
All else is a…
A
Mixture
6
Q
Homogeneous
A
Solution, evenly mixed
7
Q
Heterogenous
A
Clumpy
8
Q
Physical change
A
Reversible, no new substances
9
Q
Chemical change
A
New substance, irreversible
10
Q
Measure of nucleus
A
10^-15 m (angstrom)
11
Q
Size of atom
A
10^-10 m(angstrom)
12
Q
Charge of an atom
A
Protons- electrons
13
Q
Mass of atom
A
Protons + neutrons
14
Q
A=
A
Atomic mass
15
Q
Z=
A
Atomic number
