Sodium ion (na+) and calcium ion (ca2+) produce nearly the same color in a flame test (yellow and yellow-orange, respectively). describe a way to differentiate between the two using a solution of na2co3 and write the correct balanced equation(s).

Sodium ion (Na+) and calcium ion (Ca2+) produce nearly the same color in a flame test. So you'll get 2 equations:
1) Na2CO3+2Na+→ Na2CO3+2Na+. It's referred to Na+
2) Ca2++Na2CO3→CaCO3+2Na. It's to Ca2+.
Hope, you'll find it useful.

It would be (at) + cu (s)

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.