Year 10 exam Flashcards
1
Q
What is an isotope
A
2 or more elements that contain equal amounts of protons and a different amount of electrons
2
Q
What are the characteristics of a simple covalent structure
A
Low melting / boiling point
3
Q
What are the characteristics of diamond
A
High heat conductor, hard, high melting / booming point
4
Q
What are the characteristics of graphite
A
Good electric conductor, soft, high melting/ boiling point
5
Q
How do you calculate moles
A
Mole =mass / mr
6
Q
How do you calculate number of molecules
A
Mass of substance/ molar mass of substance (RAM x 6.023 x 10*23
7
Q
How do you calculate concentration
A
Concentration = mass or moles / volume
8
Q
How do you get from cm3 to dm3
A
/1000
9
Q
How do you calculate atom economy
A
Desired product / sum of reactants
