8F — Periodic Table

Question 1

What are the signs of a chemical reaction?

Answer 1

● colour change
● gas produced
● solid formed from solution
● energy change

Question 2

What is a chemical formula?

Answer 2

The chemical formula of a substance tells you the number of atoms of each element that are joined in its molecules, or the ratio of atoms of each element in the compound.

Question 3

What are the common properties of metals?

Answer 3

The common properties of most metals are:
● high melting points
● solids at room temperature
● strong and flexible
● malleable
● shiny (when polished)
● good conductors of heat and electricity

Question 4

What are the two types of properties for metals?

Answer 4

● chemical properties (e.g. flammability, pH, reaction with acid)
● physical properties (e.g. melting point, boiling point, density)

Question 5

1) Do metals tend to form acidic or alkaline solutions?

2) Do non-metals tend to form acidic or alkaline solutions?

Answer 5

1) Metal oxides tend to form alkaline solutions

2) Non-metal oxides tend to form acidic solutions

Question 6

1) What are alkali metals?

2) Where are semi-metals on the periodic table?

Answer 6

1) Alkali metals, in group 1, react with water, forming an alkaline solution and hydrogen.
2) Semi metals are between metals on the left and non-metals on the right.

Question 7

1) What are halogens?

2) What are noble gases?

Answer 7

1) Halogens are reactive non-metals.

2) Nobel gases are very unreactive gases. They do not form compounds easily.

Question 8

What are the common properties of non-metals?

Answer 8

The common properties of most non-metals are:
● low melting point
● brittle(when solid)
● not shiny
● poor conductors of heat and electricity