Periodic Table
This element has the chemical symbol O.
oxygen
The name of the compound NaCl.
sodium chloride
In a balanced equation, the number of atoms on both sides must be this.
equal (the same)
In the equation:
2H2+O2→2H2O
The mole ratio of H₂ to H₂O is this.
1:1 or 2:2
A chemist burns 8 grams of methane (CH₄) in oxygen.
How many moles of oxygen gas (O₂) are required for the reaction?
Balanced equation:
CH4+2O2→CO2+2H2O
1.0 mole of O₂
These elements are found in Group 18 and are known for being unreactive.
noble gases
Compounds made of a metal and a nonmetal are called this.
ionic compounds
__ Na + __ Cl₂ → __ NaCl
2 Na + 1 Cl₂ → 2 NaCl
How many grams are in 2 moles of NaCl? (NaCl = 58.5 g/mol)
117 g
How many grams of NH₃ are made from 9 moles of H₂?
N2+3H2→2NH3
(Molar mass NH₃ = 17 g/mol)
102 grams
What tells you how many protons are in an atom?
Atomic Number
The formula for aluminum oxide.
Al₂O₃
__ C₃H₈ + __ O₂ → __ CO₂ + __ H₂O
1 C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
In the equation:
2Al+6HCl→2AlCl3+3H2
The mole ratio of HCl to H₂ is this.
6:3 or 2:1
How many grams of CO₂ are made from 3 moles of C₃H₈?
Equation:
C3H8+5O2→3CO2+4H2O
Molar mass CO₂ = 44 g/mol
396 g CO₂
Atomic number increases as you move in this direction on the periodic table.
left to right and top to bottom
Bond type in NH₃.
covalent
__ Al + __ HCl → __ AlCl₃ + __ H₂
2 Al + 6 HCl → 2 AlCl₃ + 3 H₂
How many grams are in 0.25 moles of Ca(OH)₂? (Molar mass ≈ 74 g/mol)
18.5 g
C3H8+5O2→3CO2+4H2O
How many grams of CO₂ are made from 44 grams of C₃H₈?
(Molar mass C₃H₈ = 44 g/mol, CO₂ = 44 g/mol)
132 grams
This group contains the most reactive nonmetals.
Group 17 (halogens)
Can exist as gases, liquids, or soft solids.
covalent compounds
__ KMnO₄ + __ HCl → __ KCl + __ MnCl₂ + __ H₂O + __ Cl₂
2 KMnO₄ + 16 HCl → 2 KCl + 2 MnCl₂ + 8 H₂O + 5 Cl₂
How many moles of KCl are produced when 2 moles of KMnO₄ react in
2KMnO4+16HCl→2KCl+2MnCl2+8H2O+5Cl2
2 moles
How many grams of H₂O are produced from 10 grams of H₂?
Equation:
2H2+O2→2H2O
Molar mass of H₂ = 2 g/mol
Molar mass of H₂O = 18 g/mol
90 g H₂O