Electrolytes Worksheet - General Chemistry, Exercises of Chemistry

Download Electrolytes Worksheet - General Chemistry and more Exercises Chemistry in PDF only on Docsity! Electrolytes Worksheet 1. What is an electrolyte? Give an example. ______________________________________________________________________________ ______________________________________________________________________________ 2. Classify the following substances by type of electrolyte (acid, base or salt). KOH Ba(NO3)2 KF H2SO3 HNO3 Na2CO3 Mg(OH)2 NH4OH Fe(OH)3 HCl ________________ MgCl2 ________________ Ca(OH)2 ______________ 3. Write the equation for the electrolytic dissociation of the following compounds: HCl ______________________________________________________________________________ NaOH ___________________________________________________________________________ H2SO4 ______________________________________________________________________________ Mg(OH)2 ______________________________________________________________________________ BeCl2 ______________________________________________________________________________ 4. To check the electrical conductivity of certain substances, a student used a conductivity apparatus equipped with a light bulb. Her observations are listed in the following table. Which one of the following groups of substances contains only electrolytes? A) CH3OH and CCl4 C) CH3OH NaOH and CH3COOH B) HCl , MgC12 and CCl4 D) HCl, MgC12, NaOH and CH3COOH 5. Four chemical substances are given below. 1. H2SO4 2. Ca(OH)2 3. MgC12 4. C2H5OH Which of these substances is a base? A) Substance 1 B) Substance 2 C) Substance 3 D) Substance 4 6. A student must classify six aqueous solutions. The student knows that all except one of the solutions must be an ACID, a BASE, or a NEUTRAL SALT. The student writes a procedure and carries out certain tests. The table shows the results that were obtained. Solution Litmus paper Electrical conductivity 1 No effect Good 2 Turned blue Good 3 Turned red Good 4 No effect None 5 Turned blue Weak 6 Turned blue Good Based on these results, which conclusion is the most appropriate? A) Solutions 2, 5 and 6 are bases, solution 3 is an acid and solutions 1 and 4 are salts B) Solutions 2, 5 and 6 are bases, solution 3 is an acid and solutions 1 and 4 are distilled water C) Solutions 2, 5 and 6 are bases, solution 3 is an acid, solution 1 is a salt and solution 4 can not be classified D) Solution 3 is a base, solutions 2, 5 and 6 are acids and solutions 1 and 4 are salts 7. How does a solution conduct electricity? 8. Explain what a non-electrolyte is. 9. If you are given a molecular formula, how can you determine if it is a non-electrolyte?