8 original questions from New Regents. The worksheet, answer key, and browser practice are free.

Download worksheet PDFDownload worked answer keyPractice these questions online
Ions in Aqueous Solutions 4 questions

Ions in Aqueous Solutions

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

In these dilute-solution models, the listed salts dissolve and separate into their component ions. The ions can move through water.

Question 1

Which particles result when one formula unit of NaCl dissolves and separates?

  1. One Na⁺ and one Cl⁻
  2. One neutral Na atom and one neutral Cl atom
  3. Two Na⁺ ions and one Cl⁻
  4. One Na⁻ and one Cl⁺

Question 2

How many moles of chloride ions result when 0.200 mol of CaCl₂ completely dissociates? Show the formula ratio.

Write your answer and work on the printable worksheet, or answer online.

Question 3

What carries electric charge through a salt solution?

  1. Only neutral water molecules
  2. Only neutrons moving through the water
  3. Mobile positive and negative ions
  4. Solid pieces of salt that remain at the bottom

Question 4

Why does dissolved glucose contribute little to a water sample’s electrical conductivity?

Write your answer and work on the printable worksheet, or answer online.

Answer this set online →

Reading a Dissolved-Particle Model 4 questions

Reading a Dissolved-Particle Model

Use the information below to answer the questions.

A model displays only the solute ions in equal-volume samples. Each counter represents an equal amount of the indicated ion. All solutes are completely dissociated in the model.

SampleDissolved solutePositive-ion countersNegative-ion counters
PNaCl6 Na+6 Cl-
QCaCl26 Ca2+12 Cl-
RKCl3 K+3 Cl-

Question 5

Which sample shows the most dissolved solute-ion counters in total?

  1. P
  2. Q
  3. R
  4. All three show the same total.

Question 6

Use Q’s ion counts and charges to explain why the modeled solute has zero total charge.

Write your answer and work on the printable worksheet, or answer online.

Question 7

Which two samples have equal numbers of positive and negative counters within each sample?

  1. P and Q
  2. P and R
  3. Q and R
  4. All three

Question 8

How many times as great is the chloride concentration in Q as in R? Use the counters and volumes.

Write your answer and work on the printable worksheet, or answer online.

Answer this set online →

2025 Chemistry Reference Tables · Browse Chemistry worksheets