Here are the correct classifications for the matter worksheet.
Part 1: Homogeneous vs. Heterogeneous Matter
*
Homogeneous: The mixture looks the same throughout (uniform). You cannot see the different parts.
*
Heterogeneous: The mixture is not uniform. You can see different parts or chunks.
1. carbonated soft drink (w/ bubbles):
heterogeneous (The gas bubbles make it non-uniform)
2. chocolate chip ice cream:
heterogeneous (You can see the chips)
3. Italian salad dressing:
heterogeneous (Oil and vinegar separate)
4. corn syrup:
homogeneous
5. soil:
heterogeneous (Contains rocks, dirt, organic matter)
6. aluminum foil:
homogeneous (It is a pure element/metal)
7. black coffee:
homogeneous (Assuming no grounds are visible)
8. sugar water:
homogeneous (The sugar dissolves completely)
9. air (with smog):
heterogeneous (Smog contains solid particles suspended in air)
10. paint:
homogeneous (Liquid paints are generally uniform mixtures)
11. rubbing alcohol:
homogeneous
12. full fat milk:
heterogeneous (It is a colloid; fats are suspended in water)
13. beach sand:
heterogeneous
14. pure air:
homogeneous (A uniform mixture of gases)
15. chunky spaghetti sauce:
heterogeneous
Part 2: Pure Substances vs. Mixtures
*
Pure Substance: Made of only one type of atom (Element - E) or one type of molecule (Compound - C). It has a fixed chemical formula.
*
Mixture: Two or more substances physically combined. They can be separated.
1. sodium:
Pure substance (E)
2. water:
Pure substance (C) ($H_2O$)
3. soil:
Mixture
4. coffee:
Mixture
5. oxygen:
Pure substance (E)
6. isopropyl alcohol:
Pure substance (C) (Specific chemical compound)
7. carbon dioxide:
Pure substance (C) ($CO_2$)
8. cake batter:
Mixture
9. air:
Mixture (Nitrogen, Oxygen, etc.)
10. chicken noodle soup:
Mixture
11. iron:
Pure substance (E)
12. salt water:
Mixture
13. chocolate chip ice cream:
Mixture
14. nitrogen:
Pure substance (E)
15. Eggs:
Mixture (Yolk, white, shell are different substances)
16. Blood:
Mixture
17. table salt:
Pure substance (C) (Sodium Chloride, $NaCl$)
18. nail polish:
Mixture
19. milk:
Mixture
20. Soda:
Mixture
Parent Tip: Review the logic above to help your child master the concept of classification of matter worksheet.
