Compounds in Solutions
1. Define the following terms: (3 x 0.5 ea = 1.5 pts)
a) strong electrolyte
b) weak electrolyte
2. Briefly explain: (2 pts)
a) what does it mean when we say a molecule is polar?
b) what does it mean when we say a molecule is nonpolar?
Part 1: Electrolytes. Click to watch the video below, record observations and answer questions.
Observations and conclusions: Fill in the table: (0.25 pt ea.)
|Name of each substance tested||
Chemical formula of
|Is the substance ionic or covalent?||
Brightness of light bulb:
bright, dim or no light?
Is the substance:
Our body fluids such as blood and sweat have dissolved ions,
a) list four major types of ions in our body fluids; (1 pt)
b) in your opinion, are our body fluids strong, weak or nonelectrolytes? (1 pt)
Part 2: Polarity of common substances: Watch the video below, record observations and answer questions.
Observations and conclusions: Fill in the table. (0.25 pt ea.)
|Name of substances||
Solubility in water:
Is the substane soluble or insoluble in water?
Solubility in oil:
Is the substance soluble or insoluble in oil?
|Is the substance polar or nonpolar?|
1. In a few sentences explain what it means by “like dissolves like”. (1 pt)
2. A common vitamin in milk is found to be soluble in cyclohexane (cyclohexane is a substance tested in the video), but insoluble in water.
a) Is this vitamin a polar molecule or nonplolar molecule? (0.5 pt)
b) Explain. (1.5 pt)
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