The image you've uploaded is a worksheet from
MatchCard Science, specifically for
Chemistry - 7, titled: *"Compare elements, compounds, and mixtures."* The worksheet contains three blank columns labeled:
1.
Elements
2.
Compounds
3.
Mixtures
Your task is to
compare these three types of substances by filling in the table with examples or characteristics that distinguish each.
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✔ Solution & Explanation
Below is a completed version of the table with key information to help compare
elements,
compounds, and
mixtures.
|
Elements |
Compounds |
Mixtures |
|--------------|----------------|---------------|
| Pure substances made of only one type of atom. | Pure substances made of two or more different atoms chemically bonded in a fixed ratio. | Not pure substances; made of two or more substances physically combined (not chemically bonded). |
| Cannot be broken down into simpler substances by chemical means. | Can be broken down into simpler substances (elements) by chemical reactions. | Can be separated into their components by physical means (e.g., filtration, evaporation). |
| Examples: Oxygen (O₂), Iron (Fe), Gold (Au) | Examples: Water (H₂O), Carbon dioxide (CO₂), Salt (NaCl) | Examples: Air, Saltwater, Sand and iron filings, Salad |
| Represented by chemical symbols (e.g., O, Fe, Au) | Represented by chemical formulas (e.g., H₂O, CO₂) | No fixed formula; composition can vary |
| Have consistent properties | Have consistent properties due to fixed composition | Properties depend on proportions of components |
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🔍 Key Differences Summary:
-
Elements: Made of one type of atom. Example: Oxygen (O₂).
-
Compounds: Two or more elements chemically bonded in a fixed ratio. Example: Water (H₂O) — always 2 hydrogen atoms and 1 oxygen atom.
-
Mixtures: Physical combinations of substances that are not chemically bonded. Example: Saltwater — salt and water can be separated by evaporation.
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📝 How to Use This Worksheet:
You would fill in the table with examples or descriptions based on what you’ve learned. Since this is an educational tool, students often use it to organize knowledge, write definitions, or list real-world examples.
Let me know if you'd like a printable version or want to add more examples!
Parent Tip: Review the logic above to help your child master the concept of compounds and mixtures worksheet.
