Which combination of aqueous solutions below, when mixed together, will result in evidence of a chemical reaction?

A. ammonium acetate and silver nitrate
B. lithium chloride and sulfuric acid
C. sodium chloride and potassium sulfate
D. sodium bromide and lithium carbonate
E. lithium bromide and silver nitrate

LiBr + AgNO₃ →  AgBr ↓ + LiNO₃

Option E.

Explanation:

We determine our reactants, and we analyse if there is a precipitated formed.

A. NH₄CH₃COO + AgNO₃  →  AgCH₃COO + NH₄NO₃

No reaction.

Salts from acetate are slightly soluble, all the salts from nitrate are soluble

B. 2LiCl + H₂SO₄ → 2HCl  +  Li₂SO₄

No reaction. Sulfates can only make precipitate with Ca²⁺, Ba²⁺, Mg²⁺, Ag⁺ and Pb²⁺

C. 2NaCl + K₂SO₄ → 2KCl + Na₂SO₄

Same explanation as before. Salts from halides (Cl⁻, Br⁻, I⁻, F⁻) are mostly soluble but we have exceptions.

D. 2NaBr + Li₂CO₃ → Na₂CO₃ + 2LiBr

Salts from carbaonate and group 1 are soluble. The others elements make precipitates with carbonates.

E. Salt from bromide and silver cation is a precipitated. Bromines can also make solid when it is mixed with Hg₂²⁺, Cu⁺, Pb²⁺

E. LiBr + AgNO₃ →  AgBr ↓ + LiNO₃

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;