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1. The -------- can be arranged in a special pattern called the periodic table. (lesson 27a)
2. What do we call the vertical columns in the periodic table? (27a)
3. What do we call the horizontal rows in the periodic table? (27a)
4. Atoms of the same element have the same number of -------. (27a)
5. If a substance is made up from only one type of ----, it is called an element. (27c)
6. What is a compound? (27c)
7. A given mass of magnesium will always react with the same mass of oxygen. We say that magnesium oxide has ----- composition. (27d)
8. What is the chemical formula of the compound which contains 3 chlorine atoms (Cl) for every aluminium atom (Al)? (27d)
9. What are the differences between a mixture and a compound? (27e)
10. What is the difference between a mineral and a rock? (27f)
11. Which type of rock is formed from magma? (27f)
12. Which type of rock is formed by particles settling in layers? (27f)
13. What do we call rock which has changed its form because of heat and pressure deep underground? (27f)
14. What do we call it when rocks are worn away by the wind, rain or ice? (27g)
15. Particles of rock can be carried along by rivers. As they move, they wear away more rock. What do we call this? (27g)

ANSWERS

1. Elements.
2. Groups
3. Periods.
4. Protons.
5. Atom.
6. A substance containing 2 or more different types of atom.
7. Fixed.
8. AlCl₃.
9. Compounds have a fixed composition - mixtures don't. Mixtures contain more than one substance - a compound is a single substance. It is easy to separate the substances in a mixture.
10. A mineral is a single substance, rocks are mixtures.
11. Igneous rock.
12. Sedimentary rock.
13. Metamorphic rock.
14. Weathering.
15. Erosion.