Given the balanced equation representing a reaction:
mg(s) + ni2+(aq) ==> mg2+(aq) + ni(s)
what is the total number of moles of electrons lost by mg(s) when 2.0 moles of electrons are gained by ni2+(aq)?
(1) 1.0 mol (3) 3.0 mol
(2) 2.0 mol (4) 4.0 mol

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation:

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year