Which of the following are balanced equations? check all that apply. a. 4na(s) + o2(g) → 2na2o(s) b. 2mg(s) + o2(g) → 2mgo(s) c. c3h8(g) + o2(g) → co2(g) + h2o(g) d. c3h8(g) + 5o2(g) → 3co2(g) + 4h2o(g

Answer : The correct option is, A, B and D

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

(A)

(B)

(C)

(D)

From the given reactions, the reaction A, B and D are the balanced chemical reactions because in this reactions the number of atoms of individual elements present in the reactant side are equal to the product side.

While in reaction C the number of individual elements are not equal on both the sides. So, this reaction are not balanced reaction.

Hence, the correct balanced reaction are, A, B and D

the answer to your question is c

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".