5.1.1.1 Atoms, Elements and Compounds Flashcards
1
Q
What is an atom?
A
- smallest part of an element that can exist
2
Q
What are all substances made of?
A
- atoms
3
Q
What are atoms of each element represented by?
A
- a chemical symbol
- e.g. O represents an atom of oxygen
4
Q
How many (about) different elements are there?
A
- 100
5
Q
Where are elements shown?
A
- in the periodic table
6
Q
How are compounds formed?
A
- from elements by chemical reactions
7
Q
What do chemical reactions always involve?
A
- formation of one or more new substances
- detectable energy change (often)
8
Q
What do compounds contain?
A
- two or more elements that are chemically combined
- in fixed proportions
9
Q
How can compounds by represented?
A
- formulae using the symbols of the atoms from which they are formed
10
Q
How can compounds be separated into elements?
A
- chemical reactions
11
Q
How can chemical reactions be represented?
A
- word equations
- symbol/formulae equations
12
Q
What are the names of the first 20 elements?
A
- hydrogen
- helium
- lithium
- beryllium
- boron
- carbon
- nitrogen
- oxygen
- fluorine
- neon
- sodium
- magnesium
- aluminium
- silicon
- phosphorus
- sulphur
- chlorine
- argon
- potassium
- calcium
13
Q
What are the symbols of the first 20 elements?
A
- H
- He
- Li
- Be
- B
- C
- N
- O
- F
- Ne
- Na
- Mg
- Al
- Si
- P
- S
- Cl
- Ar
- K
- Ca
14
Q
What are the names of the elements in group one?
A
- lithium
- sodium
- potassium
- rubidium
- caesium
- francium
15
Q
What are the symbols of the elements in group one?
A
- Li
- Na
- K
- Rb
- Cs
- Fr
