Period 3

Question 1

sodium + oxygen

Answer 1

4Na (s) + O₂ (g) → 2Na₂O (s)

reaction conditions: heat
reacion: vigorous
flame: bright yellow
product: white solid

Question 2

magnesium + oxygen

Answer 2

2Mg (s) + O2 (g) → 2MgO (s)

reaction conditions: heat
reaction: vigorous
flame: bright white
product: white solid

Question 3

aluminium + oxygen

Answer 3

4Al (s) + 3O2 (g) → 2Al2O3 (s)

reaction conditions: powdered aluminium
reaction: fast
flame: bright white
product: white powder

Question 4

silicon + oxygen

Answer 4

Si (s) + O2 (g) → SiO2 (s)

reaction conditions: powdered silicon + heat strongly
reaction: slow
flame: bright white sparks
product: white powder

Question 5

phosphorous + oxygen

Answer 5

4P (s) + 5O2 (g) → P4O10 (s)

reaction conditions: heat
reaction: vigorous
flame: yellow or white
product: white clouds

Question 6

sulfur + oxygen

Answer 6

S (s) + O2 (g) → SO2 (g)

reaction conditions: powdered sulfur + heat
reaction: gentle
flame: blue
product: toxic fumes