Group 1 and 7

Question 1

What elements are in Group 1?

Answer 1

Lithium, Sodium, Potassium and more.

Question 2

What is Group 1 also known to be called?

Answer 2

Alkali Metals

Question 3

How do Group 1 Metals react with water?

Answer 3

Vigorously

Question 4

What do Group 1 Metals produce when they react with Water?

Answer 4

Alkaline Metal Hydroxide and Hydrogen Gas

Question 5

Out of Lithium, Sodium and Potassium, which has the highest reactivity with water?

Answer 5

Potassium

Question 6

Why does the reactivity increase as you go down the group (group 1)?

Answer 6

Shielding

• there are more electron shells
• therefore the outer electron gets further away from the nucleus
• which reduces the electrostatic attraction allowing the outer electrons to be more easily lost
• which increases reactivity.

Atomic Radius
- the atoms get larger
therefore the radius of the atom increases
- which reduces the electrostatic attraction
- allowing the outer electrons to be easily lost

Question 7

Describe the observations you would see when Potassium reacts with water.

Answer 7

• fizzy, bubbles of hydrogen gas
• melts into a ball in the water that dashes around the surface
• ignited and produced a lilac color flame
• disappears the quickest out

Question 8

What are the Group 7 non-metals also called?

Answer 8

Halogens

Question 9

What elements are in Group 7?

Answer 9

Fluorine, Chlorine, Bromine, Iodine and more.

Question 10

What state, and color are the following elements in, at room temperature? (Fluorine, Chlorine, Bromine and Iodine)

Answer 10

Fluorine - Gas, Yellow
Chlorine - Gas, Pale Green
Bromine - Liquid, Red Brown
Iodine - Solid, Dark Grey

Question 11

Out of Fluorine, Chlorine, Bromine and Iodine which has the highest reactivity with water?

Answer 11

Fluorine

Question 12

Why does the reactivity increase as you go down the group?

Answer 12

The further down the group,

• the higher the atomic radius is and the number of shells. - therefore the electrostatic attraction is further away and weaker
• so it gets harder to gain more electrons

Question 13

Describe the trends of the physical properties of Halogens

Answer 13

• Melting and Boiling Points increase as you go down the group
• state at room temperature changes (more hard and set) as you go down the group
• the colour (darker) changes as you go down the group

Question 14

Describe the reaction you would see with Lithium and water.

Answer 14

• slower reaction than sodium
• fizzy, bubbles of hydrogen gas (reactive)
• indicator changed color (turned the water alkali)
• burns w/ a Red Flame

Question 15

Describe the reaction you would see with Sodium and water.

Answer 15

• melts into a ball in the water that dashes around the surface
• disappears quickly
• fizzy, bubbles of hydrogen gas (reactive)
• burns w/ a Yellow / Orange flame