Material
|
Pure Substance
or Mixture
|
Element, Compound,
Homogeneous, Heterogeneous
|
sugar + pure water
(C12H22O11 + H2O)
| ||
Iron (Fe)
| ||
limestone (CaCO3)
| ||
orange juice
| ||
Pacific Ocean
| ||
air inside a balloon
| ||
aluminum (Al)
| ||
magnesium (Mg)
| ||
acetylene (C2H2)
| ||
tap water in a glass
| ||
pure water (H2O)
| ||
chromium (Cr)
| ||
salt + pure water
(NaCl + H2O)
| ||
benzene (C6H6)
| ||
baking soda (NaHCO3)
|
Q2.
Classify each of the following as elements (E), compounds (C) or Mixtures (M). Write the letter X if it is none of these.
1. Diamond(C)
2. Sugar (C6H12O6)
3. Milk
4. Iron (Fe)
5. Air
6. Sulfuric Acid (H2SO4)
7. Gasoline
8. Electricity
9. Krypton (K)
10. Bismuth (Bi)
11. Uranium (U)
12. Popcorn
13. Water (H2O)
14. Alcohol (CH3OH)
15. Pail of Garbage
16. A cat
17. Ammonia (NH3)
18. Salt (NaCl)
19. Energy
20. Gold (Au)
21. Wood
22. Ink
23. Pizza
24. Dry Ice (CO2)
25. Baking Soda (NaHCO3)
26. Titanium (Ti)
27. Concrete
Q3.
Read the following information on elements, compounds and mixtures. Fill in the blanks where necessary.
Elements (pure substances):
1. A pure substance containing only one kind of _______1_____.
2. An element is always uniform all the way through (homogeneous).
3. An element _______2______ be separated into simpler materials (except during nuclear reactions).
4. Over 100 existing elements are listed and classified on the _________3_______.
Compounds (pure substances):
5. A pure substance containing two or more kinds of ______4_________.
6. The atoms are _________5________ combined in some way. Often times (but not always) they come together to form groups of atoms called molecules.
7. A compound is always homogeneous (uniform).
8. Compounds __________6_________ be separated by physical means. Separating a compound requires a chemical reaction.
9. The properties of a compound are usually different than the properties of the elements it contains.
Mixtures:
10. Two or more ________7________ or ________8________ NOT chemically combined.
11. No reaction between substances.
12. Mixtures can be uniform (called ____________9____________) and are known as solutions.
13. Mixtures can also be non-uniform (called __________10______________).
14. Mixtures can be separated into their components by chemical or physical means.
