Let's go through each item on the worksheet and classify it as an
Element (E),
Compound (C),
Mixture (M), or
X if it is none of these.
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Definitions:
-
Element (E): A pure substance made of only one type of atom (e.g., oxygen, gold).
-
Compound (C): A pure substance made of two or more elements chemically bonded in a fixed ratio (e.g., water, salt).
-
Mixture (M): A combination of two or more substances that are not chemically bonded and can be separated physically (e.g., air, milk).
-
X: If it's not a chemical substance (like energy or electricity), or not a matter-based entity.
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Now let's classify each:
1.
A dog – X
→ A living organism, not a chemical substance.
2.
Air – M
→ A mixture of gases (mainly nitrogen, oxygen, CO₂, etc.).
3.
Alcohol – C
→ Ethanol (C₂H₅OH) is a compound (specifically, ethanol).
4.
Ammonia – C
→ NH₃, a compound made of nitrogen and hydrogen.
5.
Baking Soda – C
→ Sodium bicarbonate (NaHCO₃), a compound.
6.
Bismuth – E
→ A metal element (Bi).
7.
Bronze – M
→ An alloy of copper and tin (a mixture).
8.
Concrete – M
→ A mixture of cement, sand, gravel, and water.
9.
Diamond – E
→ Pure carbon (C), just one element arranged in a crystal lattice.
10.
Dry Ice – C
→ Solid carbon dioxide (CO₂), a compound.
11.
Electricity – X
→ Not matter; a form of energy.
12.
Energy – X
→ Not a physical substance.
13.
Gasoline – M
→ A mixture of hydrocarbons.
14.
Gold – E
→ Element (Au).
15.
Ink – M
→ A mixture of dyes, solvents, and other additives.
16.
Iron – E
→ Element (Fe).
17.
Krypton – E
→ Noble gas element (Kr).
18.
Milk – M
→ A complex mixture of water, fats, proteins, sugars, etc.
19.
Pail of Garbage – M
→ A mixture of various materials (plastic, paper, food waste, etc.).
20.
Pizza – M
→ A mixture of dough, cheese, sauce, toppings.
21.
Popcorn – M
→ A mixture of popped kernels, oil, salt, etc.
22.
Salt – C
→ Table salt is sodium chloride (NaCl), a compound.
23.
Sugar – C
→ Sucrose (C₁₂H₂₂O₁₁), a compound.
24.
Sulfuric Acid – C
→ H₂SO₄, a compound.
25.
Titanium – E
→ Element (Ti).
26.
Uranium – E
→ Element (U).
27.
Water – C
→ H₂O, a compound.
28.
Wood – M
→ A natural mixture of cellulose, lignin, water, etc.
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Final Answers:
1. A dog –
X
2. Air –
M
3. Alcohol –
C
4. Ammonia –
C
5. Baking Soda –
C
6. Bismuth –
E
7. Bronze –
M
8. Concrete –
M
9. Diamond –
E
10. Dry Ice –
C
11. Electricity –
X
12. Energy –
X
13. Gasoline –
M
14. Gold –
E
15. Ink –
M
16. Iron –
E
17. Krypton –
E
18. Milk –
M
19. Pail of Garbage –
M
20. Pizza –
M
21. Popcorn –
M
22. Salt –
C
23. Sugar –
C
24. Sulfuric Acid –
C
25. Titanium –
E
26. Uranium –
E
27. Water –
C
28. Wood –
M
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✔ This classification is based on standard chemistry definitions. Let me know if you'd like explanations for any specific ones!
Parent Tip: Review the logic above to help your child master the concept of element or compound worksheet.
