Question

1-

For the following reaction,

Na⁺_(aq) + OH^-_(aq) + H⁺_(aq) + Cl^- _(aq)  à Na⁺_(aq) + Cl^- _(aq) + H₂O _(l)

Na⁺_(aq) + Cl^- _(aq), ions not involved in the reaction, are called _________________ions.

2-

For the following reaction,

Na⁺_(aq) + OH^-_(aq) + H⁺_(aq) + Cl^- _(aq)  à Na⁺_(aq) + Cl^- _(aq) + H₂O _(l)

What type of reaction is taking place? ____________________

3-

What is the mass in grams of 1.73 mol of MgBr₂? __________

4-

What is the percentage composition of each element in PbCO₃. Record each percentage to the tenths' place.

5-

What are the products for the reaction of hydrochloric acid and sodium sulfite? Answers MUST be written in the following order: metal salt + liquid + gas

6-

Which product will not be formed from a metathesis reaction?

		Hydrobromic acid, HBr
		Carbon Dioxide, CO2
		Calcium Hydroxide, Ca(OH)2
		Acetic acid, CH3COOH

7-

Find the percent yield of AgCl when a 5.95-g sample of AgNO₃ is reacted with excess BaCl₂ to give 4.48 g of AgCl, according to the equation:

2 AgNO_{3 (aq)} + BaCl_{2 (aq)} → 2AgCl _(s) + Ba(NO₃)_{2 (aq)}

		89.2 %
		75.3 %
		59.5 %
		44.6 %

Answer 1

1) the ions which doesn't take place directly in the reaction are called spectator ions

2) this reaction is called neutralization reaction where an acid and a base reacts to form salt and water with release of energy.

3) molecular mass of MgBr2 = 184 g/mol

Mass= moles × molar mass

Mass = 1.73 × 184 = 318.32g

4) molar mass of PbCO3= 267g/mol

Mass of Pb= 207 g/mol

Percentage composition of Pb= (207/267)×100

Percentage composition of Pb= 77.5 %

Mass of C = 12

Percentage comp of C = (12/267)×100= 4.5

Percentage composition of oxygen =

Mass of 3 oxygen atoms = 3×16=48g/mol

Percentage comp = (48/267)×100= 18%