Questions: Unit 3 :Properties of Substances and Mixtures Study the molecules on the right. Place them in order from MOST soluble in water to LEAST soluble in water. Explain your reasoning: What molecules are always soluble in water? State the solubility rules using the mnemonic device learned in class.

Unit 3 :Properties of Substances and Mixtures

Study the molecules on the right. Place them in order from MOST soluble in water to LEAST soluble in water.
Explain your reasoning:

What molecules are always soluble in water? State the solubility rules using the mnemonic device learned in class.
Transcript text: Unit 3 :Properties of Substances and Mixtures Study the molecules on the right. Place them in order from MOST soluble in water to LEAST soluble in water. Explain your reasoning: What molecules are always soluble in water? State the solubility rules using the mnemonic device learned in class.
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Solution

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Solution Steps

Step 1: Identify the molecules
  • The molecules shown are alcohols with varying chain lengths.
  • From top to bottom, the molecules are:
    1. Methanol (CH3OH)
    2. Ethanol (CH3CH2OH)
    3. Propanol (CH3CH2CH2OH)
    4. Butanol (CH3CH2CH2CH2OH)
    5. Pentanol (CH3CH2CH2CH2CH2OH)
Step 2: Understand solubility in water
  • Solubility in water decreases as the hydrocarbon chain length increases.
  • This is because longer hydrocarbon chains are more hydrophobic (water-repelling).
Step 3: Order the molecules by solubility
  • Based on the chain length, the order from most soluble to least soluble in water is:
    1. Methanol (most soluble)
    2. Ethanol
    3. Propanol
    4. Butanol
    5. Pentanol (least soluble)

Final Answer

  1. Methanol (most soluble)
  2. Ethanol
  3. Propanol
  4. Butanol
  5. Pentanol (least soluble)
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