WorksheetsElectrolytes & Solution Properties — Module 21.3
Total questions: 20
Worksheet time: 10mins
Charged particles that conduct electricity in the body are called
atoms
molecules
ions
neutrons
A compound that forms ions in water is called a(n)
solvent
electrolyte
nonelectrolyte
precipitate
Solutions that contain electrolytes are able to
change color
freeze faster
conduct electricity
evaporate quickly
Sodium chloride (NaCl) is a strong electrolyte because it
stays as molecules
produces many ions in solution
does not dissolve
lowers boiling point
Strong electrolytes conduct
no current
weak current
strong current
heat only
Acetic acid (vinegar) is classified as a weak electrolyte because it
forms many ions
forms few ions
is solid
is nonpolar
Fats and sugars are examples of
strong electrolytes
weak electrolytes
nonelectrolytes
ionic compounds
The process where molecular compounds form ions when dissolved in water is called
dissociation
evaporation
ionization
condensation
Which substance forms ions by ionization?
NaCl
HCl
sugar
oil
Dissociation occurs when
molecules break into atoms
ions separate from an ionic compound
liquids evaporate
solids melt
When NaCl dissolves in water, it separates into
Na and Cl atoms
Na+ and Cl- ions
NaCl molecules
Na2Cl
Water molecules help dissolve ionic compounds because water is
acidic
nonpolar
polar
solid
The positive end of a water molecule is attracted to
sodium ions (Na+)
chloride ions (Cl-)
oxygen atoms
other water molecules only
When ions move freely in solution, the solution can
glow
freeze
conduct electricity
change color
The amount the freezing point changes depends mainly on
color of solute
type of container
number of solute particles
smell of solvent
Salt helps ice cream freeze faster because it
raises temperature
lowers freezing point
increases pressure
removes water
A solute makes freezing harder because it
adds heat
speeds up molecules
interferes with crystal formation
removes ions
Solute particles raise the boiling point because they
increase vapor pressure
lower vapor pressure
evaporate first
cool the solution
More energy is needed to boil a solution because
ions conduct heat
fewer solvent molecules escape into gas
solute particles evaporate
pressure decreases
Which statement is TRUE about solute effects on boiling and freezing points?
They depend on the chemical name of the solute
They depend on color of the solution
They depend on number of dissolved particles
They depend only on temperature
