past paper mistakes Flashcards
1
Q
why are the mass numbers of isotopes different?
A
they contain a different number of neutrons
2
Q
what is half-life
A
the time for half of the mass to decay
3
Q
Why is carbon in the form of graphite useful in an electricity experiment
A
It conducts
4
Q
what is the name given to a solution of an acuratly known concentration?
A
standard solution
5
Q
Name the metal commonly extracted from a blast furnace
A
Iron
6
Q
Name the process used to extract magnets from its ore
A
Electrolysis
7
Q
Describe the metallic structure and use it to explain how a metal conducts electricity
A
Close packed lattice of positive metal ions in a sea of delocalised electrons. They conduct electricity as the electrons are free to move
