Chemistry Unit 2 Lesson 3 Mixtures Answers
1. Filtration is useful for separating:
Answer - Solids from liquids or gases
2. Which method of separation would be most appropriate for separating a mixture of water and alcohol?
Answer - distilation
3. Which method separates components of a mixture according to how quickly the particles travel through a medium?
Answer - Chromatography
4. The boiling point of water is 100ºC. The boiling point of acetone is 56ºC. Which statement about distilling a mixture of acetone and water is correct?
Answer - Acetone will vaporize from the mixture before water.
5. Substance A and substance B are mixed together. To separate the mixture, water is added, and substance A is filtered out. Then, the remaining liquid is heated to remove the water, leaving substance B. Which statement about substance A and substance B could be correct?
Answer - Substance A is rice, and substance B is sugar.
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To find the answers to the questions, you would typically refer to your Chemistry Unit 2 Lesson 3 lecture notes or textbook. However, I can provide explanations for each answer based on general knowledge of chemistry principles.
1. Filtration is useful for separating solids from liquids or gases because it utilizes a porous barrier (such as filter paper) that allows the liquids or gases to pass through but retains the solid particles.
2. Distillation would be the most appropriate method for separating a mixture of water and alcohol. Distillation takes advantage of the different boiling points of the components in a mixture. Since alcohol has a lower boiling point than water, heating the mixture would cause the alcohol to vaporize first, while the water remains in its liquid form. The vapor is then condensed back into a liquid, resulting in the separation of the components.
3. Chromatography is the method that separates components of a mixture based on how quickly the particles travel through a medium. In chromatography, a mixture is dissolved in a solvent and passed through a stationary phase, which can be a solid or a liquid. The different components of the mixture will move at different rates through the stationary phase, leading to their separation.
4. The correct statement about distilling a mixture of acetone and water is that acetone will vaporize from the mixture before water. This is because acetone has a lower boiling point (56ºC) compared to water (100ºC). When the mixture is heated, acetone will reach its boiling point and transition to a vapor state, while water will remain as a liquid. By condensing and collecting the vapor, you can separate acetone from the mixture.
5. Based on the information provided, it is suggested that substance A is rice, and substance B is sugar. It mentions that substance A is filtered out and the remaining liquid is heated to remove the water, suggesting that substance A is a solid that can be separated by filtration. Substance B is left as a liquid after the water is removed, implying it is a soluble substance like sugar.
Remember, these answers are based on general knowledge, and it's important to consult your specific course materials for accurate and precise information.