Answer:What are the two half reactions that show how many electrons are gained or lost by each species in the reaction:
Ni2+(aq) + Mg(s) → Ni(s) + Mg2+(aq)?
atoms cannot be created or destroyed in a chemical reaction
Answer:
Acid.
Explanation:
I assume you mean 4.5?
pH below 7 is acidic
pH above 7 is alkaline
pH equal to 7 is neutral
4.5 lies below 7, so it is acidic
Answer:
C.
Explanation:
A liquid transforms into a solid when it cools off enough.
If it is cooled to freezing temperature, it goes solid.
Answer:
both are solids, both are somewhat pliable
Natural selection requires variation between individuals. Mutations and reproduction increase genetic variation in a population. Natural selection occurs when environmental pressures favor certain traits that are passed on to offspring.
