C1 Atomic Structure Flashcards
1
Q
What is an element
A
A substance made of one type of atom
2
Q
What is a compound
A
- A substance made of two or more elements chemically combined.
3
Q
- What is a mixture?
A
- A substance made of two or more elements or compounds NOT chemically combined.
4
Q
- What technique do you use to separate water from salt water?
A
- Distillation. The water will evaporate and then condense. The salt will remain.
5
Q
- What technique do you use to separate sand from salt water?
A
- Filtration. The sand will be left in the filter (residue).
6
Q
- How many atoms are in a molecule of CO2
A
- 3
7
Q
- How many elements are in a molecule of CO2
A
- 2 (carbon and oxygen)
8
Q
- Write the word equation for the reaction between iron and oxygen to make iron oxide.
A
- Iron + oxygen iron oxide
9
Q
- Balance this symbol equation
Mg + O2 MgO
A
2 Mg + O2 2 MgO
10
Q
Describe the plum pudding model of the atom.
A
- A sphere of positive charge with small negatively charged electrons scattered in it.
11
Q
What two conclusions were made from the alpha particle scattering experiments.
A
The mass of an atom is concentrated in the centre (nucleus). The nucleus is charged.
12
Q
How did Bohr and Chadwick improve the atomic model?
A
Bohr discovered Electron shells and Chadwick discovered neutrons
13
Q
- What is the radius of the atom?
A
- 0.1nm
14
Q
How big is radius of the nucleus compared to the radius of the atom?
A
1/10,000 time smaller
15
Q
What is 1nm in metres in standard form?
A
1 x 10-9 m
