The document summarizes key concepts in chemistry including: 1) The main branches of chemistry are analytical, nuclear, inorganic, organic, physical, industrial, and biochemistry. 2) Scientific notation is used to conveniently write very large or small numbers. 3) A physical change alters a substance's appearance or state but not its chemical composition, while a chemical change produces one or more new substances. 4) Water has unique physical properties including its boiling point, freezing point, and ability to change state with the addition or removal of heat.

2. Nuclear - is a subfield of chemistry dealing with radioactivity, nuclear processes and nuclear properties.

3. Inorganic - is the branch of chemistry concerned with the properties and behavior of inorganic compounds.

4. Organic - is a discipline within chemistry which involves the scientific study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of chemical compounds that contain carbon.

5. Physical - is the explanation of macroscopic, microscopic, atomic, subatomic, and particulate phenomena in chemical systems in terms of physical concepts; sometimes using the principles, practices and concepts of physics like thermodynamics, quantum chemistry, statistical mechanics and dynamics.

6. Industrial - Is a branch of chemistry which deals with converting raw materials to another raw material.

8. Ex. 0.5000 – 4sf

9. All zeros to the left of an indicated decimal point and to the right of a non zero digit

10. Ex. 5000. – 4sf

11. All zeros to the left of an understood decimal pt but to the right of a non zero digit are not significant.

13. Q = mct

14. Wherein

15. Q = amount of heat released/absorbed by the substance

16. (calories, Calories[Kilo Calories], Joules)

17. 1cal = 4.184 Joules

18. 1Cal = 1000cal

19. m = mass of the substance (grams)

21. Solid LiquidLiquid GasGas LiquidLiquid Solid

22. Q= mcfQ = mcvQ= mccQ=mcs

23. Q= cal

24. m= grams

25. cf = heat of fusion

26. cv= heat of vaporization

27. cc= heat of condensation

28. cs heat of solidification

29. Sp heat : (c)

30. Solid 0.5

31. Liquid 1.0

32. Gas 0.5

33. +cf = 80cal/g

34. +cv= 540cal/g

35. -cc= 540cal/g

36. -cs 80cal/g