Lesson 21. Calculating concentration

• Chem
• Secondary Education

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______ is a reactant that is not in excess in a chemical reaction.

1. Limiting reactant
2. Limiting condition
3. Catalyst

Enquiry question: Does a chemical reaction stop when the reactant is used up?

YES

NO

Agree or disagree. The amount of product is directly proportional to the amount of the limiting reactant.

AGREE

DISAGREE

Question: Which reactant is in excess and which is the limiting reactant?

STEP 1. Write the balanced symbol equation.

STEP 2. Determine the molar ratio.

STEP 3. Calculate the moles of each reactant.

STEP 4. Compare the moles.

______ a solid substance that dissolves in a liquid.

1. Solute
2. Solvent
3. Solution
4. Opaque

_____ is the liquid that dissolves the solid substance.

1. Solute
2. Solvent
3. Solution
4. Opaque

Most chemical reactions occur between solutes which are dissolved in solvents. Which of the following is NOT an example of a solvent?

1. silver nitrate
2. oil
3. water
4. ethanol

______ refers to the amount of solute there is in a specific volume of the solvent.

1. Solubility
2. Concentration
3. Insoluble
4. Saturation

The greater the amount of solute in a given volume, the _________ the concentration.

1. lesser
2. greater
3. more saturated
4. less saturated

Which of the following units can be used to express the amount of solute?

1. grams
2. moles
3. both A and B
4. liters

Which of the following units can be used to express the concentration of a solution in 1 L of solvent?

1. g / dm^3
2. moles / dm^3
3. moles / mL
4. both A and B

Enquiry question: 

Which solution is more concentrated?

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• Monday - Lesson 22 | Titration Calculations
  

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