Term 3 Review

Moles

100

Find the molar mass of NaCl.

What is 58 g/mol?

200

Describe the term "mole"

What is:

- a fixed number (6.022*10^23 things/particles) that's like a dozen? 

- a number we use to compare amounts of substances

300

Find the molar mass of C₂₂H₁₄O₄ (you can round)

What is 318.32 g/mol?

400

If I have 280 g N₂, how many moles of N₂ is that? (Be able to explain your process)

What is 10 moles N₂?

500

If I have 4 moles of CH₄, how many grams is that? (Be able to explain your process)

What is 64 g CH₄?

Solutions

100

Describe molarity

What is:

- a measure of concentration for solutions

- moles of solute/L of solution?

200

Describe the relationship between concentration and absorbance. (Hint: Beer Lambert Law Lab)

What is the higher the concentration, the higher the absorbance?

300

Find the molarity of a solution that has 12 moles of solute in 144 L.

What is 12 M (moles/L?

400

I want to make a 2.5 M solution. If I have 5 moles of solute, how many L should the solution be? (Be able to explain your process)

What is 2 L?

500

I have 12 L of a 4M solution. If I dilute the solution to 3M, how many L of solution will I have?

What is 16 L?

Chemical Reactions

100

Describe what a single replacement reaction is.

What is:

- Compound + element, element switches places with part of the compound

- AB + C → CB + A

200

Identify the reaction type:

H₂CO₃ → H₂O + CO₂

What is decomposition?

300

Predict the products of the reaction:

Ca + O₂ →  ?

What is CaO?

400

Explain why Na + Cl₂ does not make NaCl₂

What is elements can only have 8 valence electrons?

500

Predict the products and balance the equation:

H₂SO₄ + NaOH → ?

What is

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

Stoichiometry

100

Consider the balanced equation:

CH₄ + 4Cl₂ → CCl₄ + 4HCl

Give the mole ratio of Cl₂ to CCl₄

What is 4:1?

200

Balance the chemical equation:

C + S₈ → CS₂

What is

4C + S₈ → 4CS₂

300

N₂ + H₂ → NH₃

Balance the equation.

If I have 6 moles N₂ and 6 moles O₂, how many grams NH₃ can I make?

What is 34 g NH₃?

400

Consider the following balanced equation:

2Fe₂CO₃ + C → 4Fe + 3CO₂

If I have 60 g C, how many g CO₂ can I make?

What is 660 g CO₂?

500

Consider the following balanced equation:

2Fe2CO3 + C → 4Fe + 3CO2

If I have 10 moles of Fe2CO3 and 10 moles of C, how many moles of Fe will I produce?

What is 20 moles Fe?

*Percent yield