Chemistry Flashcards Preview

SCIENCE Y9 REVISION > Chemistry > Flashcards

Flashcards in Chemistry Deck (26):
1

Solid to liquid is...

Melting

2

Liquid to solid is...

Freezing

3

Liquid to gas is...

Boiling

4

Gas to solid is...

Condensing

5

Neutrons

Neutral (no charge) - 1 mass unit

6

Protons

+1 charge - 1 mass unit

7

Electron

-1 charge - no mass

8

Element

Made up of any 1 type of atom

9

Compound

More than 1 type of element, chemically combined together

10

Mixture

More than 1 type of element, not chemically joined

11

Molecule

A small groups of atoms, you can have a molecule of an element : O2 molecule of a compound - H2O

12

Souluble

Something that can be dissolved

13

Insoluble

Something that cannot dissolve

14

Distillation

A technique used to separate a solvent and a solution

15

Solute

A substance that dissolves in another substance

16

Solvent

A substance that dissolves a solute

17

Solution

Mixture of the solvent and the solute

18

Pure

1 element or 1 compound

19

Chromatography

Used to separate mixtures of substances into their components

20

Solvent front

The furthest the solvent ( the liquid that separates the inks ) can reach

21

What happens during chromatography?

The solvent soaks up the paper and travels to the ink dots and the ink spreads out, separating the components of the substance

22

Rf value

Distance travelled by substance

23

35 - ???
Cl
17 - ???

35 - mass no. (Protons+neutrons)
Cl
17 - atomic no. ( electrons / protons )

24

Isotopes

A variant of a particular chemical element which differ in neutron number

25

35 37
Cl Cl
17 17

Both isotopes are chlorine because they both contain 17 protons / Electrons. However they are different isotopes because their mass numbers are different.

26

Electrons

Shells around the nucleus. Max of 2 electrons on 1st shell and max of 8 electrons on other shells.