plz plz plz answer these questions plz it is an important question for our test
Answers
Answer:
A is copper
B is copper oxide(CuO)
Cu +O= CuO
Answer:
6-a- A is copper
B is copper oxide
b- oxidation-reduction reaction ie: redox reaction
c- 2Cu + O2 ------> 2CuO
CuO + H2 ------> Cu + H2O
7- reactions in which ions are exchanged between two reactants one of them being more reactive than the other in aqueous medium is called a double displacement reaction
AgNO3 + NaCl ---------> Agcl +NaNO3
in most double displacement reaction of two ionic compounds lead to the formation of an insoluble product called precipitate
8-the process when metals get oxidised in the presence of air and water (humidity) is called corrosion
- when oils and fatty acids inside eatables get oxidised when exposed to air for longer period of time is called rancidity, after this there is a foul smell and they are no longer edible
it can be prevented by storing food in air tight boxes or filling the food packets with an inert gas like nitrogen (N2) so this creates an absence of oxygen hence food items won't get rancid