Chem A

Question 1

How many electrons are in the outer shell of any group 1 element?

Answer 1

1

Question 2

what is an isotope?

Answer 2

an isotope is an atom that contains the same number of proton but different number of neutrons.

Question 3

What group is a halogen?

Answer 3

Group 7

Question 4

how many groups are there in the periodic table?

Answer 4

There are 8 groups in the periodic table.

Question 5

What separation technique is used to separate salt and water?

Answer 5

Evaporation.

Question 6

What is the positively charged atom in the nucleus?

Answer 6

Protons.

Question 7

Who invented the periodic table?

Answer 7

Dmitri Mendeleev.

Question 8

What 3 elements are magnetic?

Answer 8

Cobalt, Nickel and Iron.

Question 9

What two elements make up table salt?

Answer 9

Sodium and Chloride.

Question 10

What is distillation?

Answer 10

Distillation is a separation technique used to separate liquids with different boiling points.

Question 11

Name some properties of group 0 elements?

Answer 11

They are single atoms, they all have low boiling points, they have low densities and they are poor conductors of heat and electricity.

Question 12

What did Thomson’s plum pudding model suggest?

Answer 12

It suggested that the whole sphere is positively charged with negative electrons spread within it.

Question 13

When did Mendeleev create the periodic table?

Answer 13

1869.

Question 14

What noble gas is the most reactive?

Answer 14

Xenon.

Question 15

Why are noble gases so unreactive?

Answer 15

The reason why noble gases are so unreactive is because they have a full outer shell so that they will gain or lose electrons.

Question 16

Where are transition metals found in the periodic table?

Answer 16

Transition metals are found in the centre of the periodic table - between group 2 and 3 - with many uses.

Question 17

Name three properties of the transition metals?

Answer 17

Any three from this:

1) Form coloured compounds.

2) Good conductors of heat and electricity.

3) Malleable and Ductile.

4) High melting points 9however mercury is a liquid at room temp).

5)Hard and strong.

6) High densities.

7) Can be used as catalysts.

8) They can lose different number of electron.

Question 18

Name three properties of the group 1 metals?

Answer 18

Any three from this:

1) Silvery-coloured metals.

2) Soft.

3) Can be easily cut.

4) Shiny when cut quickly dulls.

5) Highly reactive metals.

6) The reactivity increases going down the group.

7) Low melting and boiling points.

8) Low densities.

Question 19

What happens to the atoms as you go down group 1?

Answer 19

As you go down group 1 the atoms become larger and the outer electron is further from the nucleus.

Question 20

Name the three main reactions about Alkali metals?

Answer 20

1) Alkali metals with water.

2) Alkali metals with oxygen.

3) Alkali metals with chlorine.

Question 21

What is the chemical symbol for lithium?

Answer 21

Li.

Question 22

What is the chemical symbol for Sodium?

Answer 22

Na.

Question 23

What is the chemical symbol for Potassium?

Answer 23

K.

Question 24

Name three properties of Halogens?

Answer 24

Any three from this:

1) Low melting and boiling points.

2) Increases down the group.

3) Group 7 is the only group which contains elements in all three states of matter.

4) Coloured metals.

5) Gets darker as you go down the group.

6) Diatomic Molecules.

7) Exists as two Atoms bonded together.

8) Poor conductors of heat and electricity.

9) Chemical reactivity decreases down the group.

Question 25

What will a more reactive Halogen do?

Answer 25

A more reactive Halogen will displace a less reactive Halogen from a solution.