Question

Question 1

Choose the correct evidence of a chemical reaction for each of the following observations:

a) adding a piece of zinc metal to acid causes bubbles to for

b) mixing two colorless solutions gives a pink solution

question 2

Using the activity series, predict whether a reaction occurs or no reaction occurs for each of the following single-replacement reactions:

a) Cu(NO3)2(aq) + Ni(s)  →

Reaction Occurs

b) Au(s) + H2SO4(aq)  →

Reaction Occurs

c) FeSO4(aq) + Ag(s)  →

Reaction Occurs

c) adding potassium metal to water causes flames

d) adding sodium chloride to a silver nitrate solution causes a white powder to form in the solution

question 3

Using the solubility table, predict whether a reaction occurs or no reaction occurs for each of the following double-replacement reactions:

a) AgC2H3O2(aq) + SrI2(aq)  →

Reaction Occurs

b) FeSO4(aq) + CuCl2(aq)  →

Reaction Occurs

c) NaOH(aq) + Co(NO3)2(aq)  →

Reaction Occurs

Answer 1

Ans 1.

a)  Zinc reacts quickly with the acid to form bubbles of hydrogen. i.e. Zn + 2HCl ZnCl₂ + H₂

b) Putting a few drops of sodium hydroxide solution into a test tube and add a drop of phenolphthalein solution to it. Notice that we get a change in color (pink).

Ans 2.

d) Reaction occurs. Potassium metal reacts very rapidly with water to form a colorless solution of potassium hydroxide (KOH) and hydrogen gas (H₂). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

e) Reaction occurs. If the silver nitrate solution is poured into a solution of sodium chloride, a chemical reaction occurs forming a white precipitate of silver chloride.