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WorksheetsCHM112 Term 3 Quiz 1
Total questions: 14
Worksheet time: 42mins
The valence shell electron pair repulsion (VSEPR) theory states that electron pairs, whether they are bonded or non-bonding electrons:
attract each other
form dipole attractions
repel each other
connect with other molecules
In column chromatography, the retention time Rt is best explained as:
the time that it takes a sample to move through the column, from injection to detection
the time a sample moves from the mobile phase to the detector
the concentration of a sample injected into the mobile phase
the separation time of sample components entering the mobile phase
Which of the following applies at standard temperature and pressure (STP 0°C/273.15 K and 1 atm)?
1 mole of any gas occupies 24.5 L.
1 mole of any gas occupies 22.5 L.
1 mole of any gas occupies 52.5 L.
1 mole of any gas occupies 22.7 L.
The strength of an acid refers to its ability:
to dissociate, or break down into its cation (positively charged ion) and anion (negatively charged ion), in water
to dissociate, or break down into its cation (positively charged ion), in water
to dissociate, or break down into its anion (negatively charged ion), in water
to not dissociate into its cation (positively charged ion) and anion (negatively charged ion), in water
What is a spectator ion?
An ion that does participate in a chemical reaction
An ion that does not participate in having kinetic energy
An ion that does not participate in a chemical reaction
An ion that does not participate in having an overall charge
A precipitate (solid) can only form in water when:
a metal is added into water
the precipitate is insoluble in water
two aqueous ionic solutions are mixed together
nitrate salts are added
Which of the following is incorrect?
pH is the negative logarithmic scale of hydrogen ions.
Hydrogen concentration (M) 10–6 pH = 6
[H+] = 10–pH (M)
Hydrogen concentration (M) 10+14 pH =14
Complete the following:
All ______________ salts are soluble.
Chloride
Nitrate
Hydroxide
Determine the solubility of CaCl2 at 20°C in g/100 g of water.
≈50 g/100g water at 20°C
≈75 g/100g water at 20°C
≈15 g/100g water at 20°C
≈1 g/100g water at 20°C
Which shows the three types of intermolecular force, in the correct order of decreasing strength?
Covalent bond, hydrogen bond, dipole-dipole force
Hydrogen bonds, dipole-dipole force, dispersion forces
Dispersion forces, dipole-dipole forces, hydrogen bonds
Dispersion forces, dipole-dipole forces, covalent bonds
When sodium chloride dissolves in water, the water molecules will form:
dipole-dipole bonds with the sodium chloride
hydrogen bonds with the sodium and chloride ions
covalent bonds with sodium chloride
ion-dipole bonds with sodium and chloride ions
Identify which of the properties listed below is not a property of an acid:
can conduct electricity using concentrated dissociated H+ ions.
sour tasting
turn blue in a weak solutions and purple in a strong solutions with universal indicator papers
can be corrosive when in contact with metals, to form a metal salt and hydrogen gas
Using the diagram identify which description matches the image.
a - dilute strong acid
b - concentrated strong acid
c - dilute weak acid
d - concentrated weak acid
a - concentrated weak acid
b - concentrated strong acid
c - dilute weak acid
d - dilute strong acid
a - concentrated weak acid
b - concentrated strong acid
c - dilute weak acid
d - concentrated weak acid
a - concentrated strong acid
b - concentrated weak acid
c - dilute strong acid
d - dilute week acid
Equal mole amounts of substance X and substance Y were used to make aqueous solutions of the same volume. The solution made from substance X had a high concentration of hydronium ions, while the solution containing substance Y had a low concentration of hydronium ions. Use this information to determine the correct statement.
X has a higher concentration of acid than Y.
Y has a higher concentration of acid than X.
Y is a stronger acid than X.
Y is an alkali.
