Chemical Basics
How many valence electrons does oxygen have?
6 VSE
Name Na₂O
Sodium Dioxide
Is a solution with pH 3 acidic, basic, or neutral?
Acidic
2Mg + O₂ → 2MgO
Synthesis
How many oxygen atoms are in 2CO₂
4 oxygen atoms
What type of bond forms between a metal and a nonmetal?
Ionic Bond
Name CO₂
Carbon Dioxide
Which is more acidic: a solution with pH 2 or pH 5, and by how many times?
pH 2 is 1,000 times more acidic
CaCO₃ → CaO + CO₂
Decomposition
Balance this chemical equation: Na + Cl₂ → NaCl
2Na + Cl₂ → 2NaCl
Draw the Lewis diagram of Mg²⁺
[Mg]²⁺
Name FeCl₃
Iron (III) Chloride
Name NaOH
Sodium Hydroxide
Zn + CuSO₄ → ZnSO₄ + Cu
Single Displacement
Balance: Al + Cl₂ → AlCl₃
2Al + 3Cl₂ → 2AlCl₃
Which conducts electricity when dissolved in water: NaCl or glucose (C₆H₁₂O₆)?
NaCl, because it forms ions in solution.
Write the formula for calcium nitrate
Ca(NO₃)₂
What two products generally form when an acid neutralizes a metal hydroxide?
A salt and water
AgNO₃ + NaCl → AgCl + NaNO₃
Double Displacement
Write the skeletal equation for hydrogen gas reacting with oxygen gas to produce water. (AND BALANCE)
2H₂ + O₂ → 2H₂O
An atom has 17 protons and 18 electrons. What ion has formed, and what is its charge?
Cl⁻ with a −1 charge.
Name N₂O₅ and H₂SO₄(aq)
Dinitrogen pentoxide and sulfuric acid
Predict and balance: H₂SO₄ + KOH → ?
H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
What is the difference between complete and incomplete combustion?
Complete combustion produces CO₂ and H₂O, incomplete combustion may produce CO, carbon (soot), as well as H₂O.
Balance: C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.