A Quick Chemistry Quiz!

1. Which one of the following is the method used to separate NH4Cl from mixture containing (NH4Cl,,SiO2,,NaCl)?

Filteration

Extraction

Heat (sublimation)

1+2

2. Collegative properities of solution include all of the following except :

Boiling point elevation

Vapor pressure lowering

Equilibrium constant depression

Freezing point depression

3. Baking soda contain :

HCl

NaOH/Al

NH4+

NaHCO3

4. Which one of the following precaution is NOT true ?

Wear a lab coat

Always pour water into acid , not acid into water

Clean up all broken glass ware immeditly

Dont perform any unauthorized expirement

5. The freezing point of a solution made by dissolved 14 g unkown in 200 g of water (k_f= 1.86 c⁰/m, T_f = 0 c⁰) decreased by 3 c⁰ ... the molar mass of unkown is :

26 g/mol

32.6 g/mol

43.4 g/mol

62 g/ mol

6. Which of the following arrangement is true according to decreasing in melting point

NaCl>NH4Cl>SiO2

SiO2>NaCl>NH4Cl

SiO2>NH4Cl>NaCl

NH4Cl>SiO2>NaCl

7. Mixture containing (NaCl,SiO₂,NH₄Cl,), NaCl = 35% , when the mixture heated it mass decreased to (0.97 g ) the remaining was dissolved in water ,the solid was filtered and its mass was (0.27 g), what is the mass of NH₄Cl in water ?

0.85 g

2.53 g

1.3 g

1.45 g

8. A mixture weighing (3.9 g) contains BaCL3.2H2o ( 244.2 g/mol ) and Na3Po4.12H2o (380.2 g/ mol ), when this mixture dissolved in water and heated for a time (0.45 g) of BaCl3.(PO4)2 is ( 602.2 g/ mol ) producrd , if BaCl3.2H2O is the limiting reactant , how many grams of Na3PO4.12H2O unreacted in the mixture ?

2.5 g

3.1 g

1.98 g

2.79 g

9. The correct measured volume in graduted cylinder with a precision of (+^_ 0.05 Cm³) is

7 Cm3

7.06 Cm3

2.3 Cm3

1.0003 Cm3

A Quick Chemistry Quiz!

1. Which one of the following is the method used to separate NH4Cl from mixture containing (NH4Cl,,SiO2,,NaCl)?

2.

What first name or nickname would you like us to use?