Which substance will conduct electricity? o Pure water (H2O) o Epsom salt dissolved in water (MgSO4) O Methane (CH4) o Carbon Dioxide (CO2)

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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### Bonding.2 Key Ideas Quiz

#### Question:
**Which substance will conduct electricity?**

1. **Pure water (H₂O)**
2. **Epsom salt dissolved in water (MgSO₄)**
3. **Methane (CH₄)**
4. **Carbon Dioxide (CO₂)**

#### Explanation:

In this quiz, you are asked to identify which of the listed substances is capable of conducting electricity. Electrical conductivity is a property that allows certain materials to let an electric current pass through them. Typically, substances that conduct electricity are those that have free ions or electrons in a state allowing them to move and carry charge.

Let's break down the options:

- **Pure water (H₂O):** Pure water is generally a poor conductor of electricity because it lacks free ions.
  
- **Epsom salt dissolved in water (MgSO₄):** When Epsom salt (magnesium sulfate) is dissolved in water, it dissociates into magnesium (Mg⁺²) and sulfate (SO₄⁻²) ions, which can move freely and conduct an electric current.

- **Methane (CH₄):** Methane is a non-polar molecule and does not ionize in solution; thus, it does not conduct electricity.

- **Carbon Dioxide (CO₂):** Carbon dioxide also does not ionize in solution and therefore does not conduct electricity.

Hence, the correct answer is:
- **Epsom salt dissolved in water (MgSO₄)**

This question centers on understanding the electrical conductivity properties of different substances, highlighting how ionic solutions can conduct electricity due to the presence of free-moving ions.
Transcribed Image Text:### Bonding.2 Key Ideas Quiz #### Question: **Which substance will conduct electricity?** 1. **Pure water (H₂O)** 2. **Epsom salt dissolved in water (MgSO₄)** 3. **Methane (CH₄)** 4. **Carbon Dioxide (CO₂)** #### Explanation: In this quiz, you are asked to identify which of the listed substances is capable of conducting electricity. Electrical conductivity is a property that allows certain materials to let an electric current pass through them. Typically, substances that conduct electricity are those that have free ions or electrons in a state allowing them to move and carry charge. Let's break down the options: - **Pure water (H₂O):** Pure water is generally a poor conductor of electricity because it lacks free ions. - **Epsom salt dissolved in water (MgSO₄):** When Epsom salt (magnesium sulfate) is dissolved in water, it dissociates into magnesium (Mg⁺²) and sulfate (SO₄⁻²) ions, which can move freely and conduct an electric current. - **Methane (CH₄):** Methane is a non-polar molecule and does not ionize in solution; thus, it does not conduct electricity. - **Carbon Dioxide (CO₂):** Carbon dioxide also does not ionize in solution and therefore does not conduct electricity. Hence, the correct answer is: - **Epsom salt dissolved in water (MgSO₄)** This question centers on understanding the electrical conductivity properties of different substances, highlighting how ionic solutions can conduct electricity due to the presence of free-moving ions.
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