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Chemistry

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Sample exercises

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? The smallest unit of an element that retains that element's chemical identity.

  1. Element
  2. Reactant
  3. Ionic bond
  4. Atom
Answer and explanation

Atom

Atom: The smallest unit of an element that retains that element's chemical identity.

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? A substance whose atoms all have the same atomic number.

  1. pH
  2. Isotope
  3. Electron
  4. Element
Answer and explanation

Element

Element: A substance whose atoms all have the same atomic number.

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? A pure substance made from two or more elements chemically combined in a fixed ratio.

  1. Covalent bond
  2. Proton
  3. Exothermic reaction
  4. Compound
Answer and explanation

Compound

Compound: A pure substance made from two or more elements chemically combined in a fixed ratio.

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? An electrically neutral group of atoms bonded together as a discrete unit.

  1. Molecule
  2. Neutron
  3. Anion
  4. Concentration
Answer and explanation

Molecule

Molecule: An electrically neutral group of atoms bonded together as a discrete unit.

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? A positively charged particle found in an atomic nucleus.

  1. Neutron
  2. Proton
  3. Anion
  4. Concentration
Answer and explanation

Proton

Proton: A positively charged particle found in an atomic nucleus.

Grades 8–12 · Chemistry

Atomic structure and chemical language: which term fits this description? An electrically neutral particle found in an atomic nucleus.

  1. Element
  2. Cation
  3. Atomic number
  4. Neutron
Answer and explanation

Neutron

Neutron: An electrically neutral particle found in an atomic nucleus.

Study notes

Half-life models

This idealized model halves the expected amount after each equal half-life interval.

Grades 10–12

Solution dilution

Solute amount is conserved; V₂ is final solution volume, not added solvent volume.

Grades 10–12

Model isotope averages

The given masses and abundances describe a hypothetical element; fractions sum to one.

Grades 9–12