Atoms, Elements and Compounds questions

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Atoms, Elements and Compounds question collection

Review Atoms, Elements and Compounds questions for Chemistry, with correct answers shown and coverage across defining a chemical bond; what happens to electrons in ionic bonding; what happens to electrons in covalent bonding.

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Question 1

What is a chemical bond?
  1. An attraction holding atoms or ions together
  2. An attraction acting between separate molecules
  3. A transfer of electrons between atoms
  4. A ratio of atoms shown in a formula

Question 2

What happens to electrons in ionic bonding?
  1. They transfer from one atom to another
  2. They are shared in pairs between atoms
  3. They become delocalised through a metal lattice
  4. They move into the atomic nuclei

Question 3

What happens to electrons in covalent bonding?
  1. Pairs are shared between atoms
  2. Electrons transfer from one atom to another
  3. Outer electrons delocalise through a lattice
  4. Protons move between atomic nuclei

Question 4

Metallic bonding is the attraction between?
  1. Positive metal ions and delocalised electrons
  2. Negative ions and shared electron pairs
  3. Neutral atoms and neutrons
  4. Molecules and hydrogen ions

Question 5

Why do ionic compounds usually have high melting points?
  1. Strong attractions act throughout a giant lattice
  2. Weak attractions act throughout a giant lattice
  3. Strong attractions act between small molecules
  4. Mobile ions repel as the solid is heated

Question 6

Why do simple molecular substances often melt easily?
  1. Forces between molecules are weak
  2. Forces between molecules are strong
  3. Covalent bonds inside molecules are weak
  4. Mobile ions separate from a giant lattice

Question 7

Why can graphite conduct electricity?
  1. Delocalised electrons move along its layers
  2. Carbon ions move between its layers
  3. Carbon atoms move through its lattice
  4. Every electron is fixed in a covalent bond

Question 8

Why is diamond very hard?
  1. Strong bonds extend throughout a giant lattice
  2. Layers slide over one another easily
  3. Weak forces act between separate molecules
  4. Mobile ions move through its lattice

Question 9

Which substance has ionic bonding?
  1. Sodium chloride (NaCl)
  2. Oxygen (O2)
  3. Methane (CH4)
  4. Carbon dioxide (CO2)

Question 10

Which substance is a simple molecular covalent substance?
  1. Carbon dioxide (CO2)
  2. Sodium chloride (NaCl)
  3. Magnesium oxide (MgO)
  4. Silicon dioxide (SiO2)

Question 11

When does sodium chloride conduct electricity?
  1. Molten or dissolved in water
  2. Solid at room temperature
  3. Gaseous at room temperature
  4. Solid or dissolved in oil

Question 12

Why are metals malleable?
  1. Ion layers slide while metallic bonding remains
  2. Shifted ion layers align like charges and repel
  3. Small molecules move through weak forces
  4. Covalent bonds break between separate molecules

Question 13

What is a polymer?
  1. A very large molecule made from repeating smaller units
  2. A pure metal with delocalised electrons
  3. A compound made from ionic crystals
  4. A gas with a low boiling point

Question 14

Which statement about water (H2O) is correct?
  1. It is a covalent compound with shared electrons
  2. It is an ionic compound with transferred electrons
  3. It is a metallic structure of hydrogen and oxygen ions
  4. It is a mixture, not a compound

Question 15

Why are ionic solids brittle?
  1. Shifted layers align like charges, causing repulsion
  2. Shifted layers keep metallic bonding intact
  3. Weak forces let small molecules slide
  4. Delocalised electrons hold flexible layers together

Question 16

Which formula represents methane?
  1. CH4
  2. C2H6
  3. CO2
  4. H2O

Question 17

Which substance has a giant covalent structure?
  1. Silicon dioxide (SiO2)
  2. Oxygen (O2)
  3. Hydrogen chloride (HCl)
  4. Water (H2O)

Question 18

Why does solid copper conduct electricity?
  1. Delocalised electrons move through the lattice
  2. Positive ions move through the lattice
  3. Electrons jump between separate molecules
  4. Protons move between atomic nuclei

Question 19

Why do atoms share electrons in covalent bonding?
  1. To fill outer shells and become more stable
  2. To increase the number of protons
  3. To form positively charged ions
  4. To remove the outer-shell electrons

Question 20

Which pair of element types most often forms an ionic compound?
  1. A metal and a non-metal
  2. Two non-metals
  3. Two noble gases
  4. Two transition metals

Question 21

What is a molecule?
  1. Atoms joined by covalent bonds
  2. Ions held in a giant lattice
  3. Metal ions among delocalised electrons
  4. Elements mixed without chemical bonds

Question 22

What forms when an atom loses electrons?
  1. A positive ion
  2. A negative ion
  3. A neutral molecule
  4. A different element

Question 23

What forms when an atom gains electrons?
  1. A negative ion
  2. A positive ion
  3. A neutral molecule
  4. A different element

Question 24

What is an ion?
  1. A charged atom or group of atoms
  2. A neutral atom with equal charges
  3. A molecule sharing electron pairs
  4. A mixture of unbonded substances

Question 25

Why do ionic compounds conduct when molten?
  1. Their ions can move
  2. Electrons move between the ions
  3. The atoms become neutral
  4. Covalent bonds break in the lattice

Question 26

Which substance has simple molecules?
  1. Carbon dioxide
  2. Sodium chloride
  3. Diamond
  4. Copper

Question 27

Why do simple molecular substances usually not conduct electricity?
  1. They have no mobile charged particles
  2. Their ions are fixed in a giant lattice
  3. Their delocalised electrons move too slowly
  4. Their covalent bonds block moving ions

Question 28

Why can metals conduct electricity?
  1. Delocalised electrons move through the structure
  2. Positive metal ions move through the solid
  3. Shared electron pairs move between molecules
  4. Outer electrons remain fixed to each atom

Question 29

What is an alloy?
  1. A metal mixed with other elements
  2. A pure metal
  3. A compound of non-metals
  4. A solution of acid and water

Question 30

What holds oppositely charged ions together?
  1. Electrostatic attraction
  2. Shared electron pairs
  3. Delocalised electrons
  4. Intermolecular forces

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Review Atoms, Elements and Compounds questions for Chemistry, with correct answers shown and coverage across defining a chemical bond; what happens to electrons in ionic bonding; what happens to electrons in covalent bonding.

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