College Chem Final
a combination of sand, salt, and water is a _______
heterogeneous mixture
salt dissolved in water is a _______
homogeneous mixture
tarnishing of silver is a ________ reaction
chemical
dissolving sugar into water is a ______ reaction
physical
how many significant digits in 0.02500001
7
how many significant digits in 0.0002510
4
the separation process using differing abilities of substances to form gasses is called ______
distillation
absolute zero = ____K
0
absolute zero = ______°C
-273
6.3 × 3.25 = ____ (sig figs)
20.
12.75 × 1.3621 = ____ (sig figs)
17.37
density = _____/______
mass/volume
which experiment discovered the charge of an electron?
oil drop
which experiment discovered the atomic nucleus?
gold foil
cathode rays are _______
electrons
isotopes are atoms that have the regular number of ______ but different number of _______
protons, neutrons
PCl5 is (ionic or covalent)
covalent
CaO is (ionic or covalent)
ionic
HCl is called
hydrochloric acid
MgF2 is called
Magnesium flouride
Al+3 ion has _____ electrons
10
how many protons does the Br- ion have?
35