Stoichiometry
What does a balanced chemical equation tell you?
Mole ratios between substances
What type of bond involves unequal sharing of electrons?
Polar Colvalent
What is the molecular geometry of CO₂?
Linear
What does molarity measure?
Moles of solute per liter of solution
What is the pH of a neutral solution?
7
In the reaction below, what is the mole ratio of O₂ to H₂O?
2H2 + O2 --> 2H2O
1:2
Which bond is the MOST polar?
H–F
What is the molecular geometry of H₂O?
Bent
What is the molarity of a solution with 2.0 mol solute in 4.0 L solution?
0.50 M
A solution with pH = 3 is acidic or basic?
Acidic
How many moles of Fe₂O₃ are produced from 8.0 mol Fe?
4Fe +3O2 --> 2Fe₂O₃
4.0 mole Fe₂O₃
Which molecule is polar?
NH₃
What is the molecular geometry of PCl₃?
Trigonal pyramid
How many moles are in 500. mL of a 0.20 M solution?
0.10 mol
What is produced during a neutralization reaction?
A salt (ionic compound) and water
A reaction has a theoretical yield of 50.0 g and an actual yield of 40.0 g. What is the percent yield?
What has to be present for a hydrogen bond to form?
Hydrogen + either oxygen, nitrogen, or fluorine.
How many lone pairs are on the central atom in NH₃?
1
A student dilutes 100. mL of 6.0 M HCl to 500. mL. What is the new concentration?
1.2 M
What color does red litmus paper turn in a base?
Blue
Which reactant is limiting?
2H2+O2 → 2H2O
O2
Explain how a hydrogen bond forms.
Electrons are shared unevenly between hydrogen and either oxygen, nitrogen, or fluorine. This creates partial positive and negative charges on the molecule. These positive and negative charges are attracted to other positive and negative charges on other molecules creating a hydrogen bond.
For PCl₃ identify:
How many grams of NaOH are needed to make 3.0 L of a 2.0 M solution?
240 g
If [H⁺] = 1.0 × 10⁻⁴ M, what is the pH?
4