### Understanding Pure Substances and Mixtures through Experiments#### Description of Substances and Experiments**Sample A**: - Volume: 100 mL of a clear liquid.- Experiment: The liquid is heated in a flask until it boils, starting at 66.2°C. As the liquid boils, the temperature continues to rise until the last of it boils away at 76.0°C.**Sample B**:- Mass: 100 g of a coarse grey powder with a faint unpleasant smell.- Experiment: 15 g of the powder is placed in a funnel lined with thick paper. When distilled water is poured over the powder, it dissolves completely, and the water underneath the funnel turns a deep purple color.---### Determining the Nature of the Samples**Question 1: Is Sample A made from a pure substance or a mixture?**- The boiling point of a pure substance remains constant. Since the boiling point of Sample A changes as it boils, this suggests it is a mixture.- **Answer:** - [ ] Pure substance - [X] Mixture - [ ] Can't decide**Question 2: Is Sample B made from a pure substance or a mixture?**- The complete dissolution and color change when water is added to Powder B suggests a chemical reaction typically seen in mixtures.- **Answer:** - [ ] Pure substance - [X] Mixture - [ ] Can't decide

The samples A and B has to be identified as pure substance or a mixture. Pure substances are those…

Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils, which starts to happen at 66.2 °C. As the liquid boils, the temperature continues to rise, until the last of the liquid boils away at 76.0 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. All of the powder disappears, and the water under the funnel turns a deep purple. alo 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." mixture (can't decide) O pure substance Is sample B 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." mixture O (can't decide)

Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils, which starts to happen at 66.2 °C. As the liquid boils, the temperature continues to rise, until the last of the liquid boils away at 76.0 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. All of the powder disappears, and the water under the funnel turns a deep purple. alo 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." mixture (can't decide) O pure substance Is sample B 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." mixture O (can't decide)

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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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

### Understanding Pure Substances and Mixtures through Experiments

#### Description of Substances and Experiments

**Sample A**:
- Volume: 100 mL of a clear liquid.
- Experiment: The liquid is heated in a flask until it boils, starting at 66.2°C. As the liquid boils, the temperature continues to rise until the last of it boils away at 76.0°C.

**Sample B**:
- Mass: 100 g of a coarse grey powder with a faint unpleasant smell.
- Experiment: 15 g of the powder is placed in a funnel lined with thick paper. When distilled water is poured over the powder, it dissolves completely, and the water underneath the funnel turns a deep purple color.

---

### Determining the Nature of the Samples

**Question 1: Is Sample A made from a pure substance or a mixture?**
- The boiling point of a pure substance remains constant. Since the boiling point of Sample A changes as it boils, this suggests it is a mixture.
- **Answer:**
- [ ] Pure substance
- [X] Mixture
- [ ] Can't decide

**Question 2: Is Sample B made from a pure substance or a mixture?**
- The complete dissolution and color change when water is added to Powder B suggests a chemical reaction typically seen in mixtures.
- **Answer:**
- [ ] Pure substance
- [X] Mixture
- [ ] Can't decide

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