Question

1. Choose the correct answer

I) Which of the following is not a property of solutions?

a) solutions are homogeneous

b) solutions contain more than one visible part

c) solutions are mixtures

d) solutions can be separated by physical means

II) How could a saturated solution of KNO3 be made unsaturated?

a) by raising the ternperature

b) by raising the pressure

c) by evaporating some of the water

d) by adding a crystal of potassium nitrate

e) by increasing the concentration

III) How would you describe a solution of KNO3 at 80 degrees Celsius and with 45 grams of solute in 100 grams of water solvent?

a) supersaturated

b) dilute

c) saturated

d) unsaturated

IV) Which substance contains the greatest amount of moles of carbon atorns per rnole of compound?

a) C7H5NO3S

b) C8H10N4O2

c) C9H8O4

d) CCl4

V) Determine the number of moles of water produced if 4.0 mol of O2 are completely reacted according to the following balanced equation:

2 C3H6 + 9 O2 = 6 CO2 + 6 H2O

A) 1.5 mol

B) 4.8 mol

c) 1.9 mol

d) 6.0 mol

e) 2.7 mol

Answer 1

I) Which of the following is not a property of solutions?

ANSWER : d) solutions can be separated by physical means

II) How could a saturated solution of KNO₃ be made unsaturated?

ANSWER : a) by raising the temperature

III) How would you describe a solution of KNO₃ at 80 degrees Celsius and with 45 grams of solute in 100 grams of water solvent?

ANSWER : d) unsaturated

IV) Which substance contains the greatest amount of moles of carbon atoms per mole of compound?

ANSWER : c) C₉H₈O₄

V) Determine the number of moles of water produced if 4.0 mol of O2 are completely reacted according to the following balanced equation:

2 C3H6 + 9 O2 = 6 CO2 + 6 H2O

ANSWER : e) 2.7 mol