Elements, Compounds, and Mixtures worksheet - Free Printable

Problem Analysis:

The task requires identifying whether each given substance is an element, compound, or mixture. Additionally, there are questions about specific substances like sea water, ice tea, and bottle water. Below is the explanation and classification for each item.

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Definitions:

1. Element: A pure substance that consists of only one type of atom. Examples: Gold (Au), Oxygen (O₂).
2. Compound: A pure substance composed of two or more different types of atoms bonded together in a fixed ratio. Examples: Water (H₂O), Carbon Dioxide (CO₂).
3. Mixture: A combination of two or more substances that are not chemically combined and can be separated by physical means. Examples: Sea water, Ice tea.

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Classification of Each Substance:

#### 1. Au (Gold)
- Classification: Element
- Reason: Gold is a pure substance consisting of only gold atoms.

#### 2. CaH₂ (Calcium hydride)
- Classification: Compound
- Reason: Calcium hydride is a chemical compound made up of calcium (Ca) and hydrogen (H) atoms bonded together in a fixed ratio.

#### 3. Ga (Gallium)
- Classification: Element
- Reason: Gallium is a pure substance consisting of only gallium atoms.

#### 4. Cu (Copper)
- Classification: Element
- Reason: Copper is a pure substance consisting of only copper atoms.

#### 5. H₂O (Water)
- Classification: Compound
- Reason: Water is a chemical compound made up of hydrogen (H) and oxygen (O) atoms bonded together in a fixed ratio (2:1).

#### 6. Rf (Rutherfordium)
- Classification: Element
- Reason: Rutherfordium is a synthetic element consisting of only rutherfordium atoms.

#### 7. H₂SO₄ (Sulfuric acid)
- Classification: Compound
- Reason: Sulfuric acid is a chemical compound made up of hydrogen (H), sulfur (S), and oxygen (O) atoms bonded together in a fixed ratio.

#### 8. HCl (Hydrogen chloride)
- Classification: Compound
- Reason: Hydrogen chloride is a chemical compound made up of hydrogen (H) and chlorine (Cl) atoms bonded together in a fixed ratio.

#### 9. O₂ (Oxygen gas)
- Classification: Element
- Reason: Oxygen gas is a diatomic molecule consisting of only oxygen atoms.

#### 10. CO (Carbon monoxide)
- Classification: Compound
- Reason: Carbon monoxide is a chemical compound made up of carbon (C) and oxygen (O) atoms bonded together in a fixed ratio.

#### 11. CO₂ (Carbon dioxide)
- Classification: Compound
- Reason: Carbon dioxide is a chemical compound made up of carbon (C) and oxygen (O) atoms bonded together in a fixed ratio.

#### 12. Sea water
- Classification: Mixture
- Reason: Sea water is a mixture of various substances, including water (H₂O), dissolved salts (e.g., sodium chloride, magnesium chloride), and other minerals. These components are not chemically bonded and can be separated by physical means.

#### 13. Ice tea
- Classification: Mixture
- Reason: Ice tea is a mixture of water, tea (which contains various compounds), sugar (if added), and ice. These components are not chemically bonded and can be separated by physical means.

#### 14. Bottle water
- Classification: Mixture
- Reason: Bottle water typically contains water (H₂O) with dissolved minerals, gases, or other additives. These components are not chemically bonded and can be separated by physical means.

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Final Answers:

1. Au: Element
2. CaH₂: Compound
3. Ga: Element
4. Cu: Element
5. H₂O: Compound
6. Rf: Element
7. H₂SO₄: Compound
8. HCl: Compound
9. O₂: Element
10. CO: Compound
11. CO₂: Compound
12. Sea water: Mixture
13. Ice tea: Mixture
14. Bottle water: Mixture

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Final Answer:

\[
\boxed{
\begin{array}{ll}
\text{Au} & \text{Element} \\
\text{CaH₂} & \text{Compound} \\
\text{Ga} & \text{Element} \\
\text{Cu} & \text{Element} \\
\text{H₂O} & \text{Compound} \\
\text{Rf} & \text{Element} \\
\text{H₂SO₄} & \text{Compound} \\
\text{HCl} & \text{Compound} \\
\text{O₂} & \text{Element} \\
\text{CO} & \text{Compound} \\
\text{CO₂} & \text{Compound} \\
\text{Sea water} & \text{Mixture} \\
\text{Ice tea} & \text{Mixture} \\
\text{Bottle water} & \text{Mixture} \\
\end{array}
}
\]