Chemistry 1
What are the elements in Group 18 called ?
Noble Gases
How many electrons are in the 3rd energy level?
18
How many sig figs in:
0.0100L
3
How many sig figs does the following measurement have: 4,007 ml
4
Name all 3 subatomic particles.
Protons Neutrons Electrons
What number do you use to find the number of protons?
atomic number
What are the 3 main states of matter?
Solid, liquid, gas
What is the 25th element called?
Manganese or Mn
C-14 has how many neutrons?
8
What is the formula for density?
Density = Mass/Volume (Mass over volume)
How many periods are shown on the periodic table?
7
What is the atomic number of neon (Ne)?
10
How many sig figs does the following measurement have: 0.9800460
7 (the zero on the right counts because there's a decimal!)
What early model of the atom did Thomson develop that involved a lump of positive charge with electrons stuck to it?
Plum-Pudding Model
What is a valence electron?
Electron in the outermost energy level
How are ions formed?
By losing or gaining valence electrons
A negatively charged ion
Anion
State the electron configuration of Ca
1s2 2s2 2p6 3s2 3p6 4s2
The Oxide ion has _____e-
10 e-
The sum of protons and neutrons in the nucleus of an atom is known as the _________
Mass number
When moving from left to right across the periodic table, what increases?
Atomic Number
Where are the electrons in the Quantum model of the atom?
Probably in the energy levels
What is in the nucleus in the atom?
protons and neutrons
Elements with the same number of protons but different number of neutrons
Isotope
Will oxygen accept or donate electrons? How many?
Accept two electrons
1 mole of Li has a mass of 7 grams. How many moles are in 21 grams?
3 moles
What is the formula mass of NaCl?
23g + 35g = 58g
How many unshared electrons does a molecule of CF4
have?
4 x 6 = 24 unshared electrons
3 H2 + 1 N2 = 2 NH3
If 2 mol H2 react with N2, how many moles of NH3
will be formed?
2 mol H2 x 2 mol NH3/3 mol H2 = 1.33 mol NH3
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
What is the percent composition of H2O?
%-H = 11.11%
%-O = 88.89%
Elements in Group 2A form ions with a charge of ___
+ 2
0.24 mol of a gas at a pressure of 3 atm and a temperature of 400K have a volume of?
P x V = n R x T
V = 0.24 x 0.0821 x 400 divided by 3 atm= 2.63 L
CS2 has a __________shape according to VSEPR
linear
Which of the following is always nonpolar?
H2O NH3 CBr3F I2
all diatomic molecules are always nonpolar - I2