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12 Cards in this Set
- Front
- Back
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At which temperatures:
10*C, 20*C, 30*C, 40*C or 50*C would you expect a solution made from 63g of ammonium chloride and 150 g of water to be unsaturated? |
The solution would be unsaturated at 40*C or 50*C.
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Estimate the number of grams of sodium fluoride that would dissolve in 100g of water at 50*C.
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Approximately 4.5 g of NaF would be soluble in 100 g of water at 50*C.
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Explain how a supersaturated solution of NaC2H3O2 can be prepared and proven to be supersaturated.
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Dissolving these substances, in warm solvent, an amount of solute greater than that needed for a saturated solution at room temperature. The warm solution is then allowed to cool very slowly. With the proper solute and careful work, a supersaturated solution will result.
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Name and distinguish between the two components of a solution.
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1. Solute: is the component that is dissolved or is the least abundant component in the solution.
2. solvent: is the dissolving agent or the most abundant component in the solution. |
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Explain why the solute does not settle out of a solution
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The concentration of a solution is the quantitative measurement of the amount of solute that is dissolved.
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Why is air considered to be a solution?
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Meets the criterial for a solution:
1. mixture of 2 or more components. 2.dissolved solute is molecular in size 3. usually transparent 4. will not settle out with time 5.can be separated from the solvent by physical means |
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Some drinks like tea are consumed either hot or cold, whereas others like Coca-Cola are drunk only cold. Why?
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Soda goes flat (loses carbonation or gas) as it warms up. Soda is usually served cold because more of the carbonation or CO2 stays in the sugar water when the soda is cold (low temp.)
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In which will a teaspoon of sugar dissolve more rapidly,
200 mL of iced tea or 200 mL of hot coffee? |
Answer: 200 mL of hot coffee. The rate of dissolving of a solid increases with temperature. This increase is due to kinetic effects. The solvent molecules move more rapidly at higher temperatures and strike the solid surfaces more often, causing the rate of dissolving to increase
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What is the effect of pressure on the solubility of gases in liquids? of solids in liquids?
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As pressure increases:
Solubility of a gas in a liquid tends to increase. Solubility of a solid in a liquid remains constant. |
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Why do smaller particles dissolve faster that large ones?
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For a given mass of solute, the smaller the particles, the faster the dissolution of the solute. This is due to the smaller particles having a greater surface area exposed to the dissolving action of the solvent.
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In a saturated solution containing undissolved solute, solute is continuously dissolving, but the concentration of the solution remains unchanged. Explain.
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Saturated solution contain dissolved solute at the limit.
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Explain why there is no apparent reaction when crystals of AgNO3 and NaCl are mixed, but a reaction is apparent immediately when solutions of AgNO3 and NaCl are mixed
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The combination of the crystals would make a physical change, which can be separated into it own parts. The combination of the solutions of these elements is a chemical change, which cannot be separated.
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