Question | Answer |
What are the 4 stages a chemical reaction has taken place? | effervescence, temperature change, colour change and precipitation is formed. |
What if a compound has ite/ate at the end of it, what does it mean? | contains oxygen |
What does a solvent do? | dissolves a solute to form a solution |
Name 4 ways to speed up a chemical reaction | higher temps, more concentrated chemicals, increase surface area and add a catalyst |
What is a catalyst? | increases surface area but remains unchanged |
What are the 3 parts of an atom and where are they found? | protons- positive, found in nucleas neutron- neutral, found in nucleas electron- negative, found orbiting nucleas |
How do you calculate the mass number? | protons added to neutrons |
What is the atomic number the same as? | number of protons and number of electrons |
What is an ion? | a charged atom or molecule |
How does an atom become an ion? | loosing electrons (positive) gaining electrons (negative) |
What is an isotope? | has the same atomic number but different mass number |
What is the relative atomic mass? | average weight of a number of isotopes |
What is a covalent bond? | overlap of 2 half filled negative electron pair clouds held together by the common attraction to 2 positive nuclei!!!! OOooohhhh yeeeaaah! |
Name at least of the 3 diatomic atoms | Flourine, chlorine, bromine, iodine, oxygen and nitrogen |
How do you find the valency? | group number |
Why are noble gases so unreactive? | because they have a full outer orbital |
How does an atom become stable? | by gaining or loosing electrons to give them a full orbital. |