HELP I will make you brainlist!! Identify which of the following are oxidation-reduction reactions. If a reaction is a redox reaction,
name the element oxidized and the element reduced.
a. Mg(s) + Br2(l) → MgBr2(s)
b. H2CO3(aq) → H2O(l) + CO2(g)
c. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
d. CuO(s) + H2(g) → Cu(s) + H2O(l)
e. Li(s) + H2O(l) → LiOH(aq) + H2(g)
f. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
g. HgO(s) → Hg(l) + O2(g)
h. P4(s) + O2(g) → P4O10(s)
i. C3H8(g) + O2(g) → CO2(g) + H2O(g)
j. Al(s) + HCl(aq) → AlCl3(aq) + H2(g)

the answer is d.) potassium

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.