WorksheetsProperties of Materials Assessment Review
Total questions: 30
Worksheet time: 16mins
What does it mean for a molecule to be polar?
the electrons in covalent bonds spend more time closer to the more electronegative atom
the electrons in ionic bonds spend more time closer to the more electronegative atom
there is covalent bonding
there are two kinds of atoms
Water is a polar molecule.
true
false
Liquid water is less dense than ice.
true
false
Why is liquid water more dense than ice?
water molecules are packed together less tightly in liquid water than ice
liquid water has fewer chemical impurities than ice
ice has more energy than liquid water does
water molecules are packed together more tightly in liquid water than ice
Why is water a universal solvent?
water is a nonpolar molecule so it can dissolve all nonpolar
water is a nonpolar molecule so it can dissolve all polar, and most ionic compounds
water is a polar molecule so it can dissolve all polar, and most ionic compounds
water is a ionic molecule so it can dissolve all polar, and most ionic compounds
Select all of the following that are unique properties of water.
water does not dissolve many substances
high specific heat
water can form h-bonds with other water molecules (cohesion) and other substances (adhesion)
water is less dense as a liquid than a solid
capillary action (adhesion and cohesion working together to tow water molecules up a thin tube)
Which of the following terms best explains why this water bug can sit on the surface of the water?
universal solvent
specific heat
adhesion
surface tension
Soda (CO2 dissolved in H2O) is an example of which solute-solvent combination?
liquid-gas
liquid-solid
gas-liquid
solid-solid
Salt dissolved in water is an example of which solute-solvent combination?
solid-liquid
liquid-liquid
liquid-solid
solid-solid
Steel alloy, Carbon (C) dissolved in Iron (Fe), is an example of which solute-solvent combination?
gas-solid
solid-solid
liquid-liquid
solid-gas
Solutions that are strong electrolytes contain what?
free electrons
100% disassociated ions
some ions
polar molecules
Select all of the following that are electrolytes.
salt (NaCl)
HCl
de-ionized water
sugar (C12H22O11)
HF
What does the phrase "like dissolves like" mean?
Substances with like size dissolve other substances with like size
Substances with like polarity dissolve other substances with like polarity
Substances with like energy dissolve other substances with like energy
Substances with like mass dissolve other substances with like mass
From the graph, determine if a solution of 100g of KNO3 at 80oC is
saturated
unsaturated
supersaturated
Which of the following substances shows a decrease in solubility as temperature increases?
Ce2(SO4)3
NaNO3
KCl
NaCl
Which of the following scenarios would contain the most dissolved carbon dioxide in soda after 20 minutes?
A sealed, refrigerated bottle of soda
An open, refrigerated bottle of soda
A sealed bottle of soda left in a warm room
An open bottle of soda left in a warm room
Which solution is the strong electrolyte?
ethanol
KCl
acetic acid solution
Why do metals conduct electricity?
metals hold onto their valence electrons tightly
metals have delocalized valence electrons
metals are rigid, crystal structures
metals are malleable and can be reshaped
Select all of the following characteristics that are true of ionic compounds
high melting point
conducts electricity only when dissolved in water
conducts electricity well
malleable
brittle
Select all of the following characteristics that apply to polymers like plastic (molecular compounds).
breaks down easily
lightweight and flexible
does not conduct electricity
resistant to chemicals
conducts electricity well
Select all of the following characteristics that apply to metals.
conducts electricity well
brittle
can be pulled into a thin wire (ductile)
forms a crystalline lattice structure when solid at room temperature
only conducts electricity in a liquid state
Why do carbon covalent network solids have high melting points?
carbon atoms have strong h-bonding between molecules.
carbon atoms only have weak intermolecular forces between them.
carbon atoms are metals with delocalized valence electrons.
each carbon atom is covalently bonded to other carbon atoms in a lattice structure.
What are allotropes?
substances made of the same atoms arranged in the same structure.
substances made of the different atoms arranged in different structures.
substances made of the same atoms arranged in different structures.
Polymers are strong, flexible, and durable.
true
false
Why are alloys used in more materials than pure metals?
Alloys are very reactive compared to pure metals.
Alloys are softer and weaker than pure metals.
alloys are less active, stronger, and have other superior properties than pure metals.
alloys always contain nonmetal atoms that are cheaper than metals.
Which of the following is true statement about alloys?
alloys have point defects that make them more brittle and reactive than pure metals.
Point defects give metals a more uniform structure that makes them less ductile.
Point defects strengthen alloys, preventing them from being brittle.
Point defects lower the melting points of alloys.
What kind of defect is occurring in the large space between the layers of atoms.
interstitial defect
vacancy defect
substitutional defect
What property of water explains why the water droplets stick to the web?
adhesion
cohesion
high specific heat
capillary action
Which of the following is a true statement about ionic compounds and molecular compounds?
Metals share electrons with nonmetals, forming covalent bonds; nonmetals transfer electrons to form ionic bonds.
Metals tend to lose electrons and nonmetals tend to gain electrons, forming ionic bonds; nonmetals share electrons to form covalent bonds.
Metals tend to gain electrons and nonmetals tend to gain electrons, forming ionic bonds; nonmetals share electrons to form covalent bonds.
Metals and nonmetals share electrons equally, forming ionic bonds; nonmetals transfer electrons to form covalent bonds.
Which statement best explains why potassium chloride (KCl) has a high melting point, whereas carbon disulfide (CS₂) has a low melting point?
KCl is made of discrete molecules with weak intermolecular forces; CS₂ is made of ions with strong ionic bonds.
KCl is composed of ions held together by strong ionic bonds; CS2 is made of molecules held together by weak IMFs.
Both compounds have strong covalent bonds, but CS2 has a lighter mass.
KCl is molecular, CS2 has a 3D network lattice structure.
