Question

1. Active metals reacting with water A. and B. Sodium and Potassium. Describe the reactions which you observed. What differences, if any, did you notice? Soolium:exPlosion fire occurned -exothrmic Potassium Fire no explosion -exother m Write a balanced chemical equation for each reaction. Sodium and water: Potassium and water: C and D. Magnesium and Calcium. Describe the reactions which you observed. Which m reacted more readily with water? How do you know? Calium, because it turned the saluhion pinl ulded at a very ropid Pace ,unlike he magnesium where bare y Cny change Swene visible Write a balanced chemical equation for each reaction. Magnesium and water: Calcium and water: 2. Metals reacting with acids For each metal, indicate whether or not it reacted with the acid: Magnesium: No Zinc: Yes No Copper: Yes Which reaction seemed to be the most vlent?

Answer 1

Answer 1

A and B : Reaction with water and sodium and potassium:

Similarities : Both the metals react explosively with water, both are exothermic , both evolve hydrogen gas, both form clear solutions

Differences:

The sodium and water results in yellow color flame over reaction mixture.

Potassium and water results in pink purple colored flame over reaction mixture.

Balanced reactions:

Sodium and water : 2Na + 2H₂O -----> 2NaOH + H₂

Potassium and water : 2K + 2H₂O -----> 2KOH + H₂

C and D:

Reaction with Calcium : reaction is exothermic and vigorous with release of hydrogen gas as bubbles.

Solution turns cloudy and pink with phenolphthalein.

Reaction with Magnesium : No visible reaction was there.

Balanced equations:

Calcium and water : Ca + 2H₂O ------> Ca(OH)₂ + H₂

Magnesium and water : Mg + H₂O -----> No reaction