Bonding questions

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Bonding question collection

Review Bonding questions for Chemistry, with correct answers shown and coverage across ionic bonding and ions; covalent molecules and giant covalent structures; metallic bonding.

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Question 1

How is an ionic bond formed?
  1. By attraction between oppositely charged ions
  2. By sharing pairs of electrons between atoms
  3. By attraction between neutral molecules
  4. By proton transfer between non-metals

Question 2

What is the formula of magnesium oxide formed from Mg2+ and O2-?
  1. MgO
  2. Mg2O
  3. MgO2
  4. Mg2O3

Question 3

Why do ionic compounds usually have high melting points?
  1. Strong attractions act throughout a giant ionic lattice
  2. They contain weak intermolecular forces
  3. Ionic bonds break easily at low temperatures
  4. Ions are not bonded in the solid state

Question 4

Why does solid sodium chloride not conduct electricity?
  1. Its fixed ions cannot carry charge
  2. It has no charged particles
  3. Its electrons are free to move
  4. Sodium chloride has covalent bonding

Question 5

When does sodium chloride conduct electricity?
  1. When molten or dissolved in water
  2. When solid
  3. When cooled below room temperature
  4. As a gas

Question 6

What is a covalent bond?
  1. A shared pair of electrons between atoms
  2. A transferred pair of protons
  3. An attraction between positive metal ions
  4. A force between ions in solution

Question 7

What type of structure does diamond have?
  1. A giant covalent structure where each carbon bonds to four others
  2. Layers of carbon with weak forces between layers
  3. A giant ionic lattice of carbon ions
  4. Small molecules with weak forces

Question 8

Why can graphite conduct electricity?
  1. It has delocalised electrons that can move through the structure
  2. It contains mobile ions in the solid
  3. Each carbon atom has no outer electrons
  4. It is made of metallic bonds

Question 9

Which statement about graphene is correct?
  1. It is a single carbon layer that conducts electricity
  2. It is a gas made of C60 molecules
  3. It is an ionic compound of carbon and oxygen
  4. It is an insulator because it has no electrons

Question 10

What best describes metallic bonding?
  1. Attraction between positive metal ions and delocalised electrons
  2. Attraction between neutral metal atoms
  3. Sharing electron pairs between metal and non-metal atoms
  4. Attraction between negative ions and protons

Question 11

Why are metals good conductors of electricity?
  1. Delocalised electrons are free to move through the metal
  2. Metal ions can leave the lattice in the solid state
  3. Metals contain free protons that move
  4. Metals are made of simple molecules

Question 12

Why are alloys usually harder than pure metals?
  1. Different-sized atoms distort layers and make sliding harder
  2. Different atoms create gaps that help layers slide
  3. Mixed atoms remove the delocalised electrons
  4. Mixed atoms arrange the layers more regularly

Question 13

Which substance has a giant covalent structure?
  1. Silicon dioxide (SiO2)
  2. Methane (CH4)
  3. Oxygen (O2)
  4. Hydrogen chloride (HCl)

Question 14

What size range defines nanoparticles?
  1. About \(1\text{ to }100\,\mathrm{nm}\)
  2. About \(1\text{ to }100\,\mathrm{mm}\)
  3. About \(1\text{ to }100\,\mathrm{\mu m}\)
  4. About \(1000\text{ to }10{,}000\,\mathrm{nm}\)

Question 15

What is one concern about widespread nanoparticle use?
  1. Possible health or environmental effects may be uncertain
  2. Bulk-material tests are assumed to predict their effects
  3. Small size is assumed to stop entry into cells
  4. Low mass is assumed to make them unreactive

Question 16

Which statement about polymers is correct?
  1. Long-chain molecules made from repeating units
  2. Giant lattices made from alternating ions
  3. Metal ions surrounded by delocalised electrons
  4. Small molecules joined by temporary intermolecular forces

Question 17

Why do ionic compounds conduct electricity when dissolved?
  1. Their ions are free to move
  2. Their electrons move between ions
  3. Their covalent bonds break into protons
  4. Their ions become neutral atoms

Question 18

Why is diamond hard?
  1. Each carbon atom forms four strong covalent bonds
  2. It has weak forces between molecules
  3. Its ions are free to move
  4. It contains delocalised electrons

Question 19

What is a simple molecular substance made of?
  1. Small covalent molecules
  2. A giant ionic lattice
  3. A giant metallic lattice
  4. A network of mobile ions

Question 20

Why do polymers have a wide range of properties?
  1. Their structures and intermolecular forces can vary
  2. All polymers have identical chain lengths
  3. They contain no covalent bonds
  4. All polymers are metals

Question 21

Why are metals malleable?
  1. Layers of atoms can slide while metallic bonding remains
  2. Their ions shatter when layers move
  3. Their atoms are joined by weak covalent bonds
  4. Their electrons are fixed between atoms

Question 22

What shape is a C60 fullerene molecule?
  1. Hollow sphere
  2. Flat sheet
  3. Straight chain
  4. Giant cubic lattice

Question 23

Why is graphene useful in electronics?
  1. It conducts electricity and is very strong
  2. It conducts electricity but breaks under small forces
  3. It is strong but lacks mobile charge carriers
  4. It is flexible but dissolves in water

Question 24

What does the state symbol (aq) mean in an equation?
  1. Dissolved in water
  2. A pure liquid
  3. A gas
  4. A solid

Question 25

Why is an ionic crystal brittle?
  1. Shifting the layers brings like charges together, which repel
  2. The ions are held by weak forces
  3. The layers slide over one another easily
  4. The electrons leave the lattice when it is struck

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Review Bonding questions for Chemistry, with correct answers shown and coverage across ionic bonding and ions; covalent molecules and giant covalent structures; metallic bonding.

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