Elements Compounds and Mixtures Worksheet | PDF | Mixture ... - Free Printable

Problem Overview:

The worksheet focuses on understanding the differences between elements, compounds, and mixtures. The task involves filling in blanks with appropriate terms and classifying given substances as elements (E), compounds (C), or mixtures (M). If a substance does not fit into any of these categories, the letter "X" should be written.

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Solution:

#### Part 1: Fill in the Blanks

##### Elements:
1. A pure substance containing only one kind of atom.
2. An element is always uniform all the way through (homogeneous).
3. An element cannot be separated into simpler materials (except during nuclear reactions).
4. Over 100 existing elements are listed and classified on the Periodic table.

##### Compounds:
1. A pure substance containing two or more kinds of atoms.
2. The atoms are chemically combined in some way. Often times (but not always) they come together to form groups of atoms called molecules.
3. A compound is always homogeneous (uniform).
4. Compounds cannot be separated by physical means. Separating a compound requires a chemical reaction.
5. The properties of a compound are usually different than the properties of the elements it contains.

##### Mixtures:
1. Two or more elements or compounds NOT chemically combined.
2. No reaction between substances.
3. Mixtures can be uniform (called homogeneous) and are known as solutions.
4. Mixtures can also be non-uniform (called heterogeneous).
5. Mixtures can be separated into their components by chemical or physical means.
6. The properties of a mixture are similar to the properties of its components.

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#### Part 2: Classification

We need to classify each substance as an element (E), compound (C), or mixture (M). If it does not fit into any of these categories, write X.

##### Classification Rules:
- Element (E): A substance made up of only one type of atom (e.g., iron, gold).
- Compound (C): A substance made up of two or more different types of atoms bonded together (e.g., water, carbon dioxide).
- Mixture (M): A combination of two or more substances that are not chemically bonded (e.g., air, milk).
- X: Substances that do not fit into the above categories (e.g., energy, electricity).

##### Substance Classification:

1. Diamond (C₆₀): Compound (C)
- Diamond is a form of carbon (C), where carbon atoms are bonded together in a specific structure.

2. Sugar (C₁₂H₂₂O₁₁): Compound (C)
- Sugar is a molecule composed of carbon, hydrogen, and oxygen atoms.

3. Iron (Fe): Element (E)
- Iron is a pure element consisting of only iron atoms.

4. Air: Mixture (M)
- Air is a heterogeneous mixture of gases like nitrogen, oxygen, carbon dioxide, etc.

5. Sulfuric Acid (H₂SO₄): Compound (C)
- Sulfuric acid is a molecule composed of hydrogen, sulfur, and oxygen atoms.

6. Gasoline: Mixture (M)
- Gasoline is a complex mixture of hydrocarbons.

7. Electricity: X
- Electricity is not a substance; it is a flow of charged particles.

8. Krypton (Kr): Element (E)
- Krypton is a noble gas consisting of only krypton atoms.

9. Bismuth (Bi): Element (E)
- Bismuth is a pure element consisting of only bismuth atoms.

10. Uranium (U): Element (E)
- Uranium is a pure element consisting of only uranium atoms.

11. Popcorn: Mixture (M)
- Popcorn is a mixture of various ingredients like corn kernels, oil, and seasonings.

12. Water (H₂O): Compound (C)
- Water is a molecule composed of hydrogen and oxygen atoms.

13. Alcohol (CH₃OH): Compound (C)
- Alcohol (methanol) is a molecule composed of carbon, hydrogen, and oxygen atoms.

14. Pair of Garbage: Mixture (M)
- Garbage is a heterogeneous mixture of various materials.

15. A dog: X
- A dog is a living organism, not a chemical substance.

16. Ammonia (NH₃): Compound (C)
- Ammonia is a molecule composed of nitrogen and hydrogen atoms.

17. Salt (NaCl): Compound (C)
- Salt is a molecule composed of sodium and chlorine atoms.

18. Energy: X
- Energy is not a substance; it is a property or a form of work.

19. Gold (Au): Element (E)
- Gold is a pure element consisting of only gold atoms.

20. Wood: Mixture (M)
- Wood is a complex mixture of cellulose, lignin, and other organic compounds.

21. Bronze: Compound (C)
- Bronze is an alloy (a mixture of metals), but for classification purposes, it is often considered a compound because it has a fixed composition.

22. Ink: Mixture (M)
- Ink is a solution of dyes or pigments in a solvent, making it a mixture.

23. Pizza: Mixture (M)
- Pizza is a heterogeneous mixture of ingredients like dough, cheese, sauce, and toppings.

24. Dry Ice (CO₂): Compound (C)
- Dry ice is solid carbon dioxide, a molecule composed of carbon and oxygen atoms.

25. Baking Soda (NaHCO₃): Compound (C)
- Baking soda is a molecule composed of sodium, hydrogen, carbon, and oxygen atoms.

26. Titanium (Ti): Element (E)
- Titanium is a pure element consisting of only titanium atoms.

27. Concrete: Mixture (M)
- Concrete is a heterogeneous mixture of cement, sand, gravel, and water.

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Final Answer:

\[
\boxed{
\begin{array}{lll}
\text{Diamond (C)} & \text{C} & \text{Sugar (C}_{12}\text{H}_{22}\text{O}_{11}\text{)} & \text{C} & \text{Iron (Fe)} & \text{E} \\
\text{Air} & \text{M} & \text{Sulfuric Acid (H}_{2}\text{SO}_{4}\text{)} & \text{C} & \text{Gasoline} & \text{M} \\
\text{Krypton (K)} & \text{E} & \text{Bismuth (Bi)} & \text{E} & \text{Uranium (U)} & \text{E} \\
\text{Water (H}_{2}\text{O)} & \text{C} & \text{Alcohol (CH}_{3}\text{OH)} & \text{C} & \text{Pair of Garbage} & \text{M} \\
\text{Ammonia (NH}_{3}\text{)} & \text{C} & \text{Salt (NaCl)} & \text{C} & \text{Energy} & \text{X} \\
\text{Wood} & \text{M} & \text{Bronze} & \text{C} & \text{Ink} & \text{M} \\
\text{Dry Ice (CO}_{2}\text{)} & \text{C} & \text{Baking Soda (NaHCO}_{3}\text{)} & \text{C} & \text{Titanium (Ti)} & \text{E} \\
\text{Pizza} & \text{M} & \text{Concrete} & \text{M} & & \\
\end{array}
}
\]