Physical and Chemical Properties.

2. Tendency of a substance to react chemically with water (e.g., sodium reacting explosively).
8. The ability of a substance to chemically combine with oxygen (e.g., iron forming rust).
9. The ability of a substance to dissolve in another substance.
10. The slow reaction of iron with oxygen and moisture to form oxides.
12. The ability of a substance to allow electricity to flow through it.
16. what you can measure or observe directly (no new substance formed)
18. Reaction of certain metals like silver with air or moisture to form a dull surface layer.
20. The smell a substance gives off.
21. how it behaves/reacts (new substances form)
23. The ability of a substance to ignite quickly and burn rapidly at normal temperatures.
24. The ability of a substance to transfer heat.

1. The ease with which a substance can catch fire and continue burning.
2. How a substance reacts when exposed to a base (e.g., acid–base neutralization).
3. The mass per unit volume of a substance.
4. The flavor of a substance (though testing this is unsafe in chemistry).
5. How a substance reacts when exposed to an acid (e.g., metal + HCl → hydrogen gas).
6. The temperature at which a solid changes into a liquid.
7. The temperature at which a liquid changes into a gas.
11. The ability of a substance to attract or repel other materials due to a magnetic field.
13. The visual appearance of a substance as perceived by the eye.
14. The spontaneous breakdown of an unstable atomic nucleus, releasing radiation.
15. Resistance of a substance to being scratched or deformed.
17. The degree to which a substance can damage living tissue through chemical interactions.
19. Gradual destruction of a material (usually metal) by chemical reaction with its environment.
22. The amount of energy released as heat when a substance undergoes complete combustion with oxygen.