Chemistry 1
What are the elements in Group 18 called ?
Noble Gases
True or false: Hydrogen is an Alkali metal?
False (its not a metal!)
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!)
Name at least 3 base S.I. Units.
Meter, Kilogram, Second, Kelvin, Ampere, Mole, Candela
What are two compounds with the same chemical formula but different structural formulas called?
Isomers
How are ions formed?
By losing or gaining valence electrons
A negatively charged ion
Anion
Is MgSO4 ionic or molecular? Why?
Ionic, it is made of a metal and ion.
What is the most common state of matter in the universe?
Plasma
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
When two nonmetals react and share electrons, what type of bond do they form?
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 gain or lose 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?
23amu + 35amu = 58amu
What is Avogadro's number (to 4 digits).
6.022 x 1023
What is the name of the group that includes oxygen?
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
What is the chemical formula of the compound created by Lithium and Peroxide (O22-)?
Li2O2
Elements in Group 2A form ions with a charge of ___
+ 2
1) Determine molar mass using formula mass.
2) Determine number of moles using #moles= mass (g)/ molar mass (g/mol)
3) Determine number of molecules using #molecules = #moles * NA
What is the equation for average atomic mass?
Average atomic mass = SUM(fractional abundance * isotope mass)
What is the equation for calculating Formula Mass?
Formula Mass = SUM(Average atomic mass * Number of atoms)