Lesson 21. Calculating concentration

• Chem
• Secondary Education

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Enquiry question: Which two beakers contain more concentrated substances?

A and B

A and C

A and D

B and C

B and D

C and D

Conclusion: Which two beakers contain more concentrated substances?

______ 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

• m = 10g
• V = 2 dm3
• 
  

• C =  ?
• C = m / V
• C = 10g / 2dm3
• 
  

• C = 5 g / dm3
• 
  

• The resulting concentration of  the NaOH solution is 5 g / dm3. 

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• Tuesday - Lesson 22  | Empirical and Molecular Formula

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