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2026 Statistics
Key Facts: Chemistry Exam
Practice Finland Ylioppilastutkinto Chemistry with 100 original study MCQs covering core lukio knowledge, application, and exam strategy. Official test is a 6-hour digital paper (up to 7/11 tasks, max 120 points).
Sample Chemistry Practice Questions
Try these sample questions to test your Chemistry exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which subatomic particle has a relative charge of +1 and a relative mass of approximately 1 u?
A.Electron
B.Proton
C.Neutron
D.Photon
Explanation: A proton has charge +1 and mass about 1 u. Electrons have charge -1 and much smaller mass; neutrons are neutral with mass about 1 u; photons are massless energy quanta.
2An atom of carbon-12 has 6 protons. How many neutrons does it have?
A.6
B.12
C.18
D.0
Explanation: Mass number A equals protons plus neutrons. For carbon-12, A = 12 and Z = 6, so neutrons = 12 - 6 = 6.
3Which element is in Group 17 (halogens) of the periodic table?
A.Sodium
B.Calcium
C.Chlorine
D.Argon
Explanation: Chlorine is a Group 17 halogen. Sodium is Group 1, calcium Group 2, and argon Group 18.
4Which type of bonding typically forms between a metal and a non-metal?
A.Covalent bonding
B.Ionic bonding
C.Metallic bonding
D.Hydrogen bonding
Explanation: Metals tend to lose electrons and non-metals gain them, forming ions held by electrostatic attraction (ionic bonding), for example NaCl.
5What is the ground-state electron configuration of a neutral oxygen atom (Z = 8)?
A.1s2 2s2 2p2
B.1s2 2s2 2p4
C.1s2 2s2 2p6
D.1s2 2s1 2p5
Explanation: Oxygen has 8 electrons: 1s2 (2) + 2s2 (2) + 2p4 (4) = 8.
6Across a period, atomic radius generally decreases from left to right mainly because
A.electron shielding increases strongly across the period
B.nuclear charge increases while electrons enter the same shell
C.atoms gain more neutrons
D.metallic character increases
Explanation: Effective nuclear charge rises as protons are added while the principal shell stays the same, pulling electrons closer and shrinking the radius.
7Which molecule is nonpolar overall despite containing polar bonds?
A.H2O
B.NH3
C.CO2
D.HF
Explanation: CO2 is linear (O=C=O); equal and opposite C=O bond dipoles cancel, so the molecule is nonpolar. H2O and NH3 have net dipoles; HF is polar.
8According to VSEPR theory, what is the electron-domain geometry of methane (CH4)?
A.Linear
B.Trigonal planar
C.Tetrahedral
D.Octahedral
Explanation: Carbon in CH4 has four bonding pairs and no lone pairs, so four electron domains arrange tetrahedrally (about 109.5 degrees).
9Which intermolecular force is primarily responsible for the unusually high boiling point of water?
A.London dispersion forces only
B.Ionic bonding between H2O molecules
C.Hydrogen bonding
D.Metallic bonding
Explanation: Water molecules form extensive O-H...O hydrogen bonds, requiring more energy to separate and elevating the boiling point relative to H2S and related hydrides.
10What is the oxidation state of sulfur in the sulfate ion SO4 2-?
A.+2
B.+4
C.+6
D.-2
Explanation: Let S = x and take oxygen as -2: x + 4(-2) = -2, so x - 8 = -2 and x = +6.
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