Elements compounds and mixtures worksheet: Fill out & sign online ... - Free Printable

Let's solve this Elements, Compounds & Mixtures Worksheet step by step.

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Part 1: Fill in the Blanks

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

> ✔ *Explanation:* Elements are made of only one type of atom. They cannot be broken down chemically, only via nuclear reactions. The periodic table organizes all known elements.

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

> ✔ *Explanation:* Compounds are formed when atoms bond chemically in fixed ratios. You can't separate them by physical methods like filtration or evaporation—chemical reactions are needed.

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

> ✔ *Explanation:* Mixtures retain the individual properties of their parts and can be separated physically (e.g., filtering, distillation).

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Part 2: Classify Each as Element (E), Compound (C), Mixture (M), or X (if none)

We will go through each item:

| Substance | Classification | Reason |
|-----------------------|----------------|--------|
| Diamond (C) | E | Pure carbon; single element in crystalline form |
| Sugar (C₆H₁₂O₆) | C | Chemical formula shows bonded C, H, O atoms |
| Milk | M | Heterogeneous mixture of water, fats, proteins |
| Iron (Fe) | E | Single element |
| Air | M | Mixture of gases (N₂, O₂, CO₂, etc.) |
| Sulfuric Acid (H₂SO₄) | C | Chemical compound with H, S, O |
| Gasoline | M | Mixture of hydrocarbons |
| Electricity | X | Not matter; form of energy |
| Krypton (K) | E | Noble gas element |
| Bismuth (Bi) | E | Metal element |
| Uranium (U) | E | Radioactive element |
| Popcorn | M | Mixture of kernels, air, oil, etc. |
| Water (H₂O) | C | Compound of hydrogen and oxygen |
| Alcohol (CH₃OH) | C | Methanol; chemical compound |
| Pail of Garbage | M | Heterogeneous mixture |
| A dog | M | Living organism made of many compounds and tissues |
| Ammonia (NH₃) | C | Compound of nitrogen and hydrogen |
| Salt (NaCl) | C | Sodium chloride; ionic compound |
| Energy | X | Not matter; form of energy |
| Gold (Au) | E | Element |
| Wood | M | Complex mixture of cellulose, lignin, water, etc. |
| Bronze | M | Alloy (mixture of copper and tin) |
| Ink | M | Mixture of dyes, solvents, etc. |
| Pizza | M | Food mixture (dough, cheese, sauce, toppings) |
| Dry Ice (CO₂) | C | Solid carbon dioxide – compound |
| Baking Soda (NaHCO₃) | C | Sodium bicarbonate; chemical compound |
| Titanium (Ti) | E | Metal element |
| Concrete | M | Mixture of cement, sand, gravel, water |

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✔ Final Answers for Part 2:

```
__E__ Diamond (C) __C__ Sugar (C₆H₁₂O₆) __M__ Milk __E__ Iron (Fe)
__M__ Air __C__ Sulfuric Acid (H₂SO₄) __M__ Gasoline __X__ Electricity
__E__ Krypton (K) __E__ Bismuth (Bi) __E__ Uranium (U) __M__ Popcorn
__C__ Water (H₂O) __C__ Alcohol (CH₃OH) __M__ Pail of Garbage __M__ A dog
__C__ Ammonia (NH₃) __C__ Salt (NaCl) __X__ Energy __E__ Gold (Au)
__M__ Wood __M__ Bronze __M__ Ink __M__ Pizza
__C__ Dry Ice (CO₂) __C__ Baking Soda (NaHCO₃) __E__ Titanium (Ti) __M__ Concrete
```

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🔍 Summary of Key Concepts:

- Element: One type of atom → e.g., Fe, Au, O₂.
- Compound: Two or more atoms chemically bonded in fixed ratio → e.g., H₂O, NaCl.
- Mixture: Two or more substances physically mixed, no chemical bonding → e.g., air, milk, concrete.
- Not matter? Like electricity or energy → classify as X.

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