Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Which of the following describes the compound  Cr(NO2)3? Choose all answers that apply.a. The compound would be expected to have a relatively low melting point.b. The compound is ionic.c. If the compo

Problem

Which of the following describes the compound  Cr(NO2)3Choose all answers that apply.

a. The compound would be expected to have a relatively low melting point.

b. The compound is ionic.

c. If the compound dissolved in water it would be a strong electrolyte.

d. The compound would conduct electricity if molten.

e. The compound is molecular.

Solution

We have a compound Cr(NO2)3 and we have to determine if this is an ionic compound and whether it is soluble in water or not.


We have to look at what ions this compound is made up of and we will go through each statement one by one.

  • NO2- is the nitrite ion. It is a polyatomic ion with a charge of -1.
  • There are 3 nitrite ions, which will give a cumulative charge of -2.
  • The charge on Cr is:

Cr + (-3) = 0

Cr – 3 = 0

Cr = +3


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