Chemistry- Atoms combining

HideShow resource information
  • Created by: Kitsune
  • Created on: 30-06-16 08:01
What is a compound?
Different types of atoms bonded together
1 of 43
How are compounds described?
By formulae
2 of 43
What is a mixture?
Different substances that are not chemically combined
3 of 43
What is brass?
An alloy, a mixture of a metal with other metals
4 of 43
How to show that mixing sulphur and iron is a physical change?
Add methylbenzene to the mixture to dissolve sulphur and then filter the iron out
5 of 43
Why is heating iron with sulphur a chemical change?
Because a new compound, iron sulphide, is formed
6 of 43
What is a physical change?
A change of state where no new chemical bonds are formed
7 of 43
What is a chemical change?
A new substance formed, energy given in or out, change is hard to reverse
8 of 43
Why do atoms bond?
To gain a stable arrangement of outer shell electrons
9 of 43
What is an ion?
A charged atom because of the imbalance of protons and electrons
10 of 43
Why don't group 8 elements react?
They have full outer shells so they are stable
11 of 43
What is an ionic bond?
Bond between ions of opposite charge
12 of 43
What do metas and non-metals form?
Ionic compounds
13 of 43
How are the ions arranged in an ionic compound?
In a regular lattice of alternating positive and negative ions
14 of 43
Why do ions stay together?
Because of the attraction of the opposite charges
15 of 43
Why don't Group 4 elements form ionic compounds?
Too much energy required to lose that many electrons
16 of 43
Which elements usually form more than one ion?
Tradition metals
17 of 43
What is the only ion of silver?
Ag +1
18 of 43
What is the only ion of zinc?
Zn +2
19 of 43
What do grouped ions form?
Compound ions
20 of 43
Which element usually form ionic compounds?
Group 1 and 7
21 of 43
How do non- metals gain full outer shells?
They share electrons
22 of 43
What do electrons around the nucleus do to each other?
Repel each other
23 of 43
What do metals and non-metals form?
Ionic compounds
24 of 43
What do non-metals form?
Covalent compounds
25 of 43
How is the structure of ionic and covalent compounds similar?
They form a regular lattice which eventually leads to crystals
26 of 43
What are the differences in properties of ionic and covalent compounds?
Unlike covalent, ionic compounds have high melting and boiling points, they conduct heat and electricity, they are soluble in water
27 of 43
What are diamond, silicon dioxide ad graphite?
Giant covalent structures or macromolecules
28 of 43
What is the structure of a diamond?
Tetrahedral shape, centre atom forms 4 bonds, strong covalent bonds
29 of 43
What are the properties of a diamond?
Vey hard and strong, high melting point (3550) and doesn't conduct
30 of 43
What are the uses of diamond?
jewellery and cutting, drilling tools
31 of 43
How does silicon dioxide occur?
As quartz, the main mineral in sand
32 of 43
What is the structure of silicon dioxide?
Silicon bonds to 4 oxygen atoms. Oxygen bonds to 2 silicon atoms.
33 of 43
What are the properties of silicon dioxide?
Hard, scratches things, high melting point (1710), lets light through
34 of 43
What are the uses of silicon dioxide?
Glasses and lenses, sandpaper
35 of 43
What is the structure of graphite?
6 carbon atoms form a ring with strong covalent bonds, the rings form flat sheets but the forces between them are weak
36 of 43
What are the properties of graphite?
Soft and slippery, dark in colour, conducts electricity
37 of 43
What are the uses of graphite?
Lubricant for engines and locks, pencil leads, electrodes and connecting brushes in generators
38 of 43
Graphite and diamond are ... of carbon
Allotropes
39 of 43
What is the structure of metals?
A lattice of positive ions in the sea of electrons
40 of 43
What is the metallic bond?
The bond between positive ions and delocalised electrons
41 of 43
How are the free electrons called?
Delocalised electrons
42 of 43
What are the key properties of metals?
High melting and boiling points, malleable and ductile, good conductors of heat and electricity
43 of 43

Other cards in this set

Card 2

Front

How are compounds described?

Back

By formulae

Card 3

Front

What is a mixture?

Back

Preview of the front of card 3

Card 4

Front

What is brass?

Back

Preview of the front of card 4

Card 5

Front

How to show that mixing sulphur and iron is a physical change?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Structure and bonding resources »