Compound Naming
Identify if the following compounds are ionic or covalent
- NaBr
- MgO
- PCl
NaBr - ionic
MgO - ionic
PCl - covalent
How many moles are in 12.011g of carbon?
1 mol
A compound is 50% carbon and 50% oxygen by mass. If you had 100g, how many grams of each element do you have?
50g of each
Explain why all substances are chemicals
Name the following covalent compounds
- N2Cl3
- CI2
- CO4
dinitrogen trichloride
carbon diiodide
carbon tetraoxide
How many grams are in 2.5 moles of oxygen gas (O2)?
80g
A 20g sample contains 8g of oxygen. What is the percent composition of oxygen?
0.4 or 40%
What is the molar mass of oxygen?
15.999g
Criss-cross to write the formula for:
- lithium oxide
- calcium chloride
Li2O
CaCl2
How many atoms are in 0.50 moles of helium?
3.01×1023 atoms
A drink weighs 25g. After evaporation, 18g remains. What percent of the drink was liquid?
0.28 or 28%
What is the difference between an empirical formula and a molecular formula?
Molecular has the full amount of atoms and empirical has the reduced amount of atoms in a ratio
Name the following ionic compounds
- FeCl3
- Ni2S
Iron (III) chloride
Nickel (I) Sulfide
How many liters are in 4.0 moles of a gas at STP?
89.6 L
A compound has an empirical formula of CH2 and a molar mass of 28 g/mol. What is the molecular formula?
C2H4
What is Avogadro’s number?
6.02 x 1023
Why do some compounds use prefixes while others do not?
Since ionic compounds must balance their charges to bond, there is only one way two elements will combine, so they do not need a prefix
How many grams are in 3.0 × 1023 molecules of nitrogen gas?
14g
A compound contains:
- 40.0% carbon
- 6.7% hydrogen
- 53.3% oxygen
Find the empirical formula.
CH2O
What is the difference between an ionic compound and a covalent compound?
Ionic compounds are between metals and nonmetals and exchange electrons to bond
Covalent compounds are between nonmetals and share electrons