Yes, it is true that ions can have a positive or negative charge.
Solutions are made up of two non reacting species called solute and solvent. The amount of solute in solvent is known as concentration of that solute. Concentration is often measured in Molarity. Molarity is the amount of solute dissolved in 1 dm3 of solution. Answer to your question is as follow;
Answer:
Solution given:
c) Magnesium metal plus silver acetate (teachers note:
<u>Balanced</u><u> </u><u>chemical</u><u> </u><u>equation</u><u>:</u>

d) hydrobromic acid plus zinc metal (teachers note:
<u>Balanced chemical equation:</u>

Answer:
1 rod, equal to 16.5 ft, is equal to exactly 5.0292 meters.
Explanation: