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BTEC Unit 1 COPY > Chemistry > Flashcards

Flashcards in Chemistry Deck (45)
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1

Name the three sub orbitals (sub shells)

s, p, d

2

What sub orbitals can be found on the first energy level and how many?

1 x s orbital

3

What sub orbitals can be found on the second energy level and how many?

1 x s and 3 x p

4

What sub orbitals can be found on the third energy level and how many?

1 x s, 3 x p and 5 x d

5

How many electrons can be placed in each orbital?

Two

6

How do electrons fill the 3 p orbitals?

Singularly first (to avoid repelling) and then they pair

7

Write the electron configuration for phosphorus

1s2 2s2 2p6 3s2 3p3

8

Write the electron configuration for chromium

1s2 2s2 2p6 3s2 3p6 4s1 3d5 (half filled orbitals)

9

Why do electrons fill the 4s before the 3d?

It is lower in energy

10

Explain the arrangement of 2p electrons for oxygen

2 electrons in Px and 1 each in Py and Pz. This happens because electrons fill orbitals singularly and then pair

11

Is potassium in the s, p or d block?

s block

12

Is fluorine in the s, p or d block?

p block

13

Is titanium in the s, p or d block?

d block

14

What is an ion?

An atom that has lost or gained electrons

15

What ions do group 2 elements make?

+2 (lose 2 electrons)

16

What ions do group 5 elements make?

-3 (gains 3 electrons)

17

Write the electron configuration for Ti 2+

1s2 2s2 2p6 3s2 3p6 3d2 (empty 4s first)

18

What is the formula for a nitrate ion?

NO3-

19

What is the formula for a sulphate ion?

SO42-

20

What is the formula for a hydroxide ion?

OH-

21

Between which atoms does ionic bonding occur?

Metal and non-metal

22

What happens to the electrons in ionic bonding?

They are transferred between atoms forming ions

23

What atoms form covalent bonds?

Non metals

24

What happens to electrons in a covalent bond?

They are shared

25

What happens to electrons in metallic bonding?

They are delocalised and can move freely within the structure

26

What is the nature of the bonding in ionic compounds?

electrostatic attraction between oppositely charged ions

27

What is the nature of the bonding in colavent compounds?

Electrostatic attraction between positively charged nucleus and negatively charged electrons

28

Describe the structure of an ionic compound

A giant lattice of oppositiely charged ions

29

Describe the structure of a metal

A giant lattice of positively charged metals ions with delocalised electrons

30

Why do ionic compounds have high melting points?

Strong electrostatic forces of attraction that require lots of energy to break