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Between which kinds of elements do ionic bonds usually form?

1. ATwo identical metals
2. BTwo noble gases
3. CTwo nonmetals
4. DA metal and a nonmetal

What is the change from a liquid to a solid called?

1. AEvaporation
2. BFreezing
3. CCondensation
4. DMelting

Which technique is used to separate the different coloured dyes in an ink?

1. AFiltration
2. BChromatography
3. CDistillation of the ink
4. DMagnetism

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts intermolecular forces are stronger than water's
2. BIts intermolecular forces are weaker than water's
3. CIts molecules are heavier than water molecules
4. DIt has a higher boiling point than water

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. AZn²⁺
2. BZn
3. CCu
4. DCu²⁺

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. ACombustion
2. BHydrolysis
3. CPolymerisation
4. DCondensation

Hydrogen peroxide fizzes when poured on a cut because an enzyme in blood breaks it down. What gas is produced, and what type of reaction is it?

1. AChlorine, in a synthesis reaction
2. BHydrogen, in a single replacement reaction
3. CCarbon dioxide, in a combustion reaction
4. DOxygen, in a decomposition reaction

Each C=O bond in carbon dioxide is polar, yet the CO₂ molecule is nonpolar. Why?

1. ACarbon has lone pairs that cancel the dipoles
2. BThe molecule is linear, so the two bond dipoles cancel out
3. CCarbon and oxygen have the same electronegativity
4. DThe bonds are ionic, not covalent