Across
- 2. A chemical compound that changes its colour in presence of an acid or base.
- 4. A galvanic process by which metals deteriorate through oxidation
- 7. Any substance composed of identical molecules consisting of atoms of two or more chemical elements.
- 8. When cations and anions in aqueous solution combine to form an insoluble ionic
- 9. A substance that produces hydrogen (H+) ions when it is added to water.
- 10. A chemical bond that involves the sharing of electrons to form electron pairs between atoms.
- 11. Any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of indicators
- 13. Two or more atoms connected by chemical bonds
- 15. Quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
- 16. A chemical reaction between substances
- 17. Type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
- 18. Consists of a central nucleus that is surrounded by one or more negatively charged electrons.
- 19. S(s)+O2(g)→SO2(g)
Down
- 1. HCl + NaOH → NaCl + H2O.
- 3. CaCO3 (s) + heat → CaO (s) + CO2 (g)
- 5. A lasting attraction between atoms or ions that enables the formation of molecules, crystals, and other structures.
- 6. During an _____________, energy is constantly given off, often in the form of heat.
- 12. An ______________ releases heat, causing the temperature of the immediate surroundings to rise.
- 14. Occur when chemical bonds between atoms are formed or broken.