Flashcards in Unit 1 Deck (40)
What is the mass number equal to?
Protons + neutrons
What are the neutrons equal to?
Mass - atomic OR mass - protons
What is an isotope?
Atoms with the same number of protons but a different number of neutrons
How do you calculate the average rate of reaction?
Change in volume / change in time
Give examples of how a reaction can be made faster
Bigger surface area, higher temperature, higher concentration, catalyst
On a reaction rate graph what indicates a faster reaction rate?
Covalent molecular bonding is between what?
Covalent network bonding is between what?
Ionic bonding is between what?
Metal + non-metal
Metallic bonding is between what?
In a covalent molecular, what forces hold the molecules together?
Weak Van der Waals forces
Covalent molecular share what to form full outer shells?
Unpaired outer electrons
In a covalent molecular what holds the atoms together?
Attraction of two positive nuclei
Do covalent molecular conduct?
Do CM dissolve in water?
Do CM have a high or low melting/boiling point?
Do CN conduct?
Do CN dissolve in water?
Do CN have a high or low melting/boiling point?
Do IL conduct?
Yes in molten or solution
Do IL dissolve in water?
Do IL have a high or low melting/boiling point?
How do you calculate relative atomic mass?
Total mass of 100 atoms/ 100 (See ring binder for example)
How does an acid form?
Non-metal oxide + water -> acid
How does an alkali form?
Metal oxide + water -> alkali
What is electrolysis?
When current/electricity is passed through a solution and breaks it up (ions are free to move)
Why do substances conduct electricity?
The ions are free to move
What is neutralisation?
When the H+ ions of an acid or the OH- ions of an alkali are removed to give a solution with a pH of 7
Acid + alkali -> ?
Salt + water