science entrance exam

• Science topics


  • Earth science
  • Physics
  • Biology
  • Chemistry
• Tectonic plates


  • Divergent
  • Convergent
  • Transform
• XX and XY chromosomes


  The sex chromosomes that determine biological sex in many species
• Covalent bond


  A chemical bond formed by the sharing of electrons between atoms
• Ionic bond


  A chemical bond formed by the transfer of electrons from one atom to another, resulting in positively and negatively charged ions
• Chemical symbol


  A one- or two-letter abbreviation used to represent a chemical element, e.g. Au for gold