Jacaranda Science 2
2.3 Classifying materials
Name:
Activities
Remember
1. What are the two types of pure substances?
2. Name three metal elements and three non-metal elements.
3. Explain how an element is different from a compound.
4. Explain how a mixture is different from a compound.
Think
5. Name the elements that comprise the following compounds.
(a) Ammonium chloride (NH4Cl)
(b) Propanol (C3H7OH)
(c) Calcium iodide (CaI2)
(d) Acetic acid (CH3COOH)
6. Classify each of the following substances as a mixture or a pure substance. For those that are pure substances, classify them as elements or compounds.
(a) Soil
(b) Iron
(c) Milk
(d) Sugar
(e) An egg
(f) Air
(g) Blood
(h) Sulfur dioxide
(i) Marmalade
(j) Calcium oxide
(k) Nitrogen
(l) Ice
(m) Lemonade
(n) Concrete
Research
7. Many years ago, balloons were filled with hydrogen so that they could float high in the sky. However, hydrogen is no longer used in balloons because it explodes too easily. At carnivals and in florists’ shops you can buy colourful gas-filled balloons that fly high into the sky if you let them go. These balloons are filled with another element called helium. Find out who discovered the gas helium, where it was discovered and when.
8. Recently some attempts have been made to circumnavigate the world in gas-filled balloons. How are these balloons propelled and how is their altitude controlled?
Notes:
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