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 the particle model of solids, liquids and gases; atoms, elements and molecules; chemical symbols and formulae.

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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

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

Question 6

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 7

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 8

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 9

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 10

A force shifts the layers in an ionic solid. What is then next to each other?
  1. Ions of like charge
  2. Ions of opposite charge
  3. Neutral atoms
  4. Shared electron pairs

Question 11

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

Question 12

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

Question 13

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 14

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 15

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 16

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

Question 17

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

Question 18

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 19

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 20

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

Question 21

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 22

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

Question 23

What causes the pressure a gas exerts on its container?
  1. Particles colliding with the walls
  2. Particles sticking to the walls
  3. The weight of the particles
  4. Particles growing in size

Question 24

What happens to the particles when a solid melts?
  1. They move out of fixed positions
  2. They grow larger in size
  3. They lose some of their mass
  4. They stop moving entirely

Question 25

In Dalton’s model, what is an atom?
  1. A tiny indivisible sphere
  2. A sphere with electrons in it
  3. A nucleus with orbiting electrons
  4. A cloud of moving charge

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Review Atoms, Elements and Compounds questions for Chemistry, with correct answers shown and coverage across the particle model of solids, liquids and gases; atoms, elements and molecules; chemical symbols and formulae.

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