**Determining Pure Substances and Mixtures****Description of Samples:**1. **Sample A:** - **Volume:** 100 mL - **Appearance:** Clear liquid - **Initial Density:** 0.77 g/mL - **Procedure:** - The liquid is heated in a flask until it boils. - The vapor collected over 10 minutes is cooled until it condenses in a separate beaker. - The density of the remaining liquid in the flask is measured again, yielding a value of 1.04 g/mL.2. **Sample B:** - **Mass:** 100 g - **Appearance:** Coarse grey powder with a faint unpleasant smell - **Procedure:** - 15 g of the powder is dissolved in ethanol. - 0.5 mg of the resulting black solution is dropped onto a thick sheet of paper laid flat in a tray. - After 30 minutes, the initial round black stain spreads out and fades in color to deep purple.**Questions:**1. **Is Sample A made from a pure substance or a mixture?** - Choices: - ⭕ Pure substance - ⚪ Mixture - ⚪ Can’t decide2. **Is Sample B made from a pure substance or a mixture?** - Choices: - ⭕ Pure substance - ⚪ Mixture - ⚪ Can’t decide**Explanation:**For Sample A, because the density changes from 0.77 g/mL to 1.04 g/mL after heating, it indicates the presence of different components with different boiling points, suggesting it is likely a mixture.For Sample B, the reaction and the change in color when the powder is applied to paper, combined with its dispersion, suggest complexity and interactions typical of mixtures.

Applying concept of physical change and mixture formation.

substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/mL. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder are dissolved in ethanol. 0.5 mg of the resulting black solution is carefully dropped onto a thick sheet of paper laid flat in a tray. After 30 minutes the initial round black stain has spread out and faded in color to a deep purple. Ar pure substance Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." O mixture O (can't decide) O pure substance Is sample B made from a pure substance or a mixture? O mixture If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." O (can't decide) IDon't Know Subm it

substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/mL. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder are dissolved in ethanol. 0.5 mg of the resulting black solution is carefully dropped onto a thick sheet of paper laid flat in a tray. After 30 minutes the initial round black stain has spread out and faded in color to a deep purple. Ar pure substance Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." O mixture O (can't decide) O pure substance Is sample B made from a pure substance or a mixture? O mixture If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." O (can't decide) IDon't Know Subm it

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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