Lecture One: Introduction Flashcards Preview

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1

How much of the world is water

71%

2

what are the 3 phases of water?

liquid, vapour, and solid

3

what compound is in 3 phases?

water is the only one naturally able to reside in 3 phases.

4

How did water come to earth , theory?

ice is on astroids, physicists think the earth was bombarded with astroids and mediators , this then melted on impact and created water on earth

5

what does an atom consist of?

nucleus, electron shell (cloud)

6

what is in the nucleus?

contains: protons (positive charge)
neutrons (no charge)

7

what does the electron shell contain?

Electron shell has electrons (negative charge)

8

electrons have what charge?

negative charge

9

protons have what charge?

positive

10

Do neutrons have a charge?

no

11

what is H?

hydrogen

12

what is O and C?

Oxygen and Carbon

13

whats an ion?

an atom or molecule that has a net electric charge, which has been made due to the gain or loss of an electron

14

can you gain and loose protons?

no never

15

which electrons are gained and lost?

ones in the outer most cell

16

whats Na+ ?

Sodium

17

whats Cl- ?

chloride

18

why does sodium have a positive charge?

?

19

whats explosive when exposed to water?

sodium

20

chlorine gas can do what to you?

kill you

21

sodium and chlorine make?

salt

22

what is S ?

sulphur

23

what is P?

phosphorus

24

whats K?

potassium

25

what happened in 1953?

basic form of DNA was being discovered

26

what happens in 2003?

mapping the human genome

27

whats the atomic number?

number of protons in the nucleus of an atom

28

Are noble gases reactive?

no

29

why are atoms allowed to ionise?

because of the atoms in the outer shell

30

what are the 3 types of bonds we need to know?

covalent, ionic, hydrogen bonds (weak)