Rememberrrr Flashcards
What is a chemical bond?
the force that holds atoms together, like super glue but a lot stronger
Ionic Bonds are between what kinds of elements?
Metals(+) and (-)non metals
Do ionic bonds share electrons between atoms?
No, one gains and one loses
Covalent Bonds are between what kinds of elements?
Nonmetal(-) and Nonmetal (-)
Do covalent bonds share electrons?
Yes covalent bonds are wise therefore share electrons, there is no loser
What is a compound?
Two or more DIFFERENT atoms
What is a molecule?
two or more atoms whether the same or different
Empirical Formula = ?
Simplest ratio/Simplest form
What is the empirical formula of C5 H10 O5 ?
CH2O
What elements in periodic table have atoms available as two?
Hydrogen H, Nitrogen N, Oxygen O, Fluorine F, Chlorine Cl, Bromine Br, Iodine I
(these are all 2)
What elements in the periodic table have atoms available as MORE than two?
Phosphorus 4, Silicone 8, Selenium 8
Group 1a has what charge
+1
What are the rules for writing the formula of ionic compounds?
- Start w metal and end w nonmetal
- Assign Charges (based on group) (sometimes they can have multiple and it will tell you)
- Flip numbers and delete SIGNS (no -)
- Simplify if possible
Group 2a has what charge
+2
Group 3a has what charge
+3
Group 4a has what charge
dont worry about
Group 5a has what charge
-3
Group 6a has what charge
-2
Group 7a has what charge
-1
Write the formula between Ca & I
CaI2
Write the formula between Al & O
Al2O3
Write the formula between Mg & S
MgS
Ionic compounds must be written in ?
Empirical formula
Why do we switch charges when writing the formula of a reaction between two elements or molecules?
To neutralize the atom
Name NaCl
Sodium Chloride
Name Al2O3
Aluminum Oxide
Write the formula of Lithium Nitride
Li3N
Write the formula of Aluminum Phosphide
AlP
Write the formula of Iron (III) Oxide
Fe2O3
Write the formula of Tin (IV) Sulfide
SnS2
Name Cu2O
Copper (I) Oxide
Name Fe2O3
Iron (III) Oxide
Name PbO2
Lead (IV) Oxide
What elements can you have more than one variant of charge therefore cannot be directly referenced by group number in the periodic table?
Fe IRON
Cr CHROMIUM
Co COBALT
Cu COPPER
Sn TIN
Hg MERCURY
Pb LEAD
Rules Of Calculating Molar Mass.
When given a molar mass problem including units only of moles and atoms, what does this include?
2 step conversion
mol —-> atoms
atoms ——-> mol
using 6.022 and the given ONLY
Rules of Calculating Molar Mass.
When grams is included in a molar mass question what does this automatically mean
Mass of specified element must be included in analysis
Rules of Calculating Molar Mass.
When grams and atoms are included in a molar mass questions this means to?
Its a 3 step question going from either
grams—–> moles ——-> atoms
atoms ——> moles ——–> grams
grams means to use ATOMIC MASS
