Chemistry: Year 9 Term 2: Textbook Questions

1) Group number = number of electrons in outer

2) Metals form + ions

3) Non-metals are on the far right, beyond the 'stairway' line

4) Transiton metals have metallic properties, form more than 1 ion, and form catalystic compounds.

5) As you go down Group 1, reactivity increases, melting point decreases and boiling point decreases.

6) Sodium hydroxide and hydrogen are produced by the reaction of sodium and water.

7) a. Alkali metals are soft; transition metals are hard. b. Alkali metals are very reactive; transition metals aren't very reactive. c. Alkali metals have low melting points; transition metals have high melting points.

8) The boiling points of the Halogens increase as you go down the group.

9) Halogens form +1 ions with metals.

10) Iodine will be displaced by chlorine to form potassium chloride and iodine as it is further up the group.

1) a. Group 1 form +1 ions. b. Group 7 form -1 ions.

2) An ionic bond forms when an element with 1/2/3 electrons gives them to one with 5/6/7 to form ions.

3) a. NaCl (Na+/Cl-) b. MgO (Mg2+/02-) c. MgCl (Mg2+/Cl2-) d. NaO (2Na+/O2-)

4) An NaCl crystal is made of rows of alternating ions in a 3D lattice, giving it sharp edges.

5) Ionic compounds have sharp edges, are conductors when liquid/solvents, and have high melting/boiling poits due to their tight bonding.

6) The three states of matter are solid, liquid and gas. 

7) The state symbol for aqueous is AQ.

8) A liquid becomes a gas at its boiling point.

9) The stonger the bonds between particles, the higher the melting and boiling points will be.