Periodicity

Question 1

The reactions are all ___________.

Answer 1

redox reactions

Question 2

what OS do elements start with?

Answer 2

zero

Question 3

what two metal elements in period 3 would react with cold water?

Answer 3

Na and Mg

Question 4

can you write the equation of Na and water?

Answer 4

2Na + H2O —> 2NaOH + H2

Question 5

what would you observe from the reaction of Na and water? (3 things)

Answer 5

1. Na floats on the surface
2. it fizzes rapidly
3. it melts because of the heat given by the reaction

Question 6

what are the products of Na and H2O reaction?

Answer 6

NaOH and H2

Question 7

What is the pH of the solution which was formed from Na and H2O reaction?

Answer 7

pH 13 - 14, strongly alkaline solution

Question 8

the reaction of Mg is very ______ in _________ temp.

Answer 8

slow, room

Question 9

can u write the equation of Magnesium and water? (2)

Answer 9

Mg + 2H2O –> Mg(OH)2 + H2

Mg + H2O –> MgO + H2

Question 10

what would you observe from the reaction of Mg and H2O at room temp.?

Answer 10

a few bubbles of hydrogen are formed after a few days.

Question 11

How to make the reaction of H2O and Mg faster?

Answer 11

By using stream

Question 12

what are the products of Mg and stream?

Answer 12

MgO and H2

Question 13

can you write the equation of Na and O2

Answer 13

2Na + 0.5O2 –> Na2O

Question 14

what would you observe when Na burns?

Answer 14

it burns brightly in air (yellow flame)

Question 15

what is the product of burning Na?

Answer 15

white sodium oxide