11.4 THE PERIODIC TABLE: GROUP 1

Question 1

What are the physical properties of group 1 elements?

Answer 1

Like all metals:
1. Shiny when freshly cut
2. Conduct electricity
Unlike all metals:
3. Can be easily cut with knife

Question 2

What happens in group 1 of the periodic table from top to bottom?

Answer 2

1. Positive ion get bigger
2. Electrostatic attraction between positive ions and negative electrons get weaker
3. Break easily
4. Melting point decreases

Question 3

What are group 1 elements’ reactions with water?

Answer 3

1. Exciting reaction with water
2. The reaction makes hydrogen gas and alkaline solution

Question 4

What is the word equation for group 1 elements?

Answer 4

Element + water -> Element hydroxide + hydrogen

Question 5

Elements in the same group will have the same chemical properties, why?

Answer 5

They have the same amount of electrons at the outermost shell
- Group 1 and Group 2 metals have the name chemical properties

Question 6

How do you prove the existence of hydrogen?

Answer 6

1. Place a lit splint in the gas
2. Splint goes out and make a squeaky pop sound, the gas is hydrogen

Question 7

How do you prove the product solution is alkaline?

Answer 7

1. Colour change after drop universal indicator is used
2. Colour change to red purple
3. Prove the solution is in alkaline

Question 8

How do you explain the pattern of group 1 elements reacting with water?

Answer 8

1. Atom gives its outer electron to an atom of another element
2. From top to bottom of group 1, the outer shell gets further from the nucleus
3. Electrostatic attraction between the nucleus and outer electron lessen
4. Outer electron easier to give away
5. Reaction more vigorous from top to bottom

Question 9

What is the trend for group 1 elements reacting with water?

Answer 9

Reaction more vigorous down the group