Across
- 1. A bond formed when atoms share electrons (Hint: Non-metals are involved)
- 3. A reaction where two or more simple substances combine to form a more complex one (Hint: A + B → AB)
- 4. A reaction where a compound reacts with oxygen, producing heat and light (Hint: CH₄ + O₂ → CO₂ + H₂O)
- 7. A process that results in a change in appearance but not chemical identity
- 8. A bond formed by the transfer of electrons from a metal to a non-metal
- 9. The prefix used for naming a molecule with four atoms of the same element
- 10. The scale used to measure the acidity or basicity of a solution
- 11. The chemical formula for a compound with one carbon and four chlorine atoms
- 13. A reaction where parts of two ionic compounds switch places (Hint: AB + CD → AD + CB)
- 14. A substance that changes color in response to pH, like litmus paper
- 16. A subatomic particle found in the valence shell and key in bonding
- 18. The subatomic particle found in the nucleus that carries no charge
- 19. This law states that mass is conserved before and after a chemical reaction
Down
- 2. This molecule consists of two oxygen atoms and is essential for combustion and respiration
- 5. A reaction where a more reactive element displaces a less reactive one (Hint: A + BC → AC + B)
- 6. A reaction where a single compound breaks down into simpler products (Hint: AB → A + B)
- 7. The atomic number of an element corresponds to the number of these subatomic particles
- 12. A substance with a pH less than 7, such as vinegar
- 15. A formula that is not yet fully balanced
- 17. A common gas produced in combustion reactions that we exhale