1. Dictionary Assignment By John Li 11 A

2. Qualitative Information  Data can be observed but not measured  For example, today is very hot is one of the qualitative information

3. Quantitative Information  Data which can be measured  For example, 42 ℃ is one kind of quantitative information

4. Observation  Use one of one or more senses to gather the information  Observation of natural phenomena

5. Interpretation  The action of explaining the meaning of something  Children often give different interpretations of the experiments

6. Description  A spoken or written account of some details during the experiments  We should write the description during the experiments

7. Data  Facts that collected during the experiments  Record the data is one of the most important processes during the experiments

8. Experiment  Procedure undertaken to make a discovery  We can test out theories by experiments

9. Hypothesis  A proposes explanation made on the basis of limited (the result is uncertain.)  We should raise a hypothesis before the experiment

10. Theory  A supposition of ideas intended to explain something （ result is certain. ）  Darwin’s theory of evolution is one of the theory

11. Law  It explains things, but they do not describe them.  Consider Newton's law of gravity

12. Matter  The physical substance in general  The entire universe is mad of different kinds of matters

13. Physical Property  Color, shape, mass, volume, density weight  Malleability, ductility  Boiling point, melting point  We can get the physical property by our eyes

14. Chemical Property  It is any of a material's properties that becomes evident during, or after, a chemical property  Flammability is one of chemical property.

15. Extensive Property  It depend on the amount of matter that is present.  Extensive property include volume and mass

16. Intensive Property  It does not depend on the amount of matter that is present  Intensive property include boiling point and density

17. Solids  Firm and stable in shape  Melted wax becomes solid when it cools

18. Liquids  A substance that flows freely but is of constant volume.  Water is one of the liquids

19. Gases  An air-like fluid substance which expands freely to fill any space available  Oxygen is gas at ordinary temperature

20. Hardness  Hardness is the ability of a solid to resist abrasion or scratching  We know the hardness of ice, so we can walk on this frozen lake

21. Malleability  Malleability is the ability to be rolled or hammered into thin sheets  This object is solid but it has malleability

22. Ductility  Ductility is the ability to be stretched or drawn into wires  The iron wire has the great ductility

23. Luster  Luster is the manner in which a solid surface reflects light  This is a pearl with a beautiful luster

24. Viscosity  Viscosity is the resistance of fluid to flow  Different kinds of fluid have different viscosities

25. Diffusion  Diffusion is the intermingling of fluids as a result of motion within the fluid  The diffusion between water and vinegar

26. Vapour  Vapour is the gaseous material formed by the evaporation of a substance which boils above room temperature  When we are boiling water, there will be many water vapour

27. Element  An element is a substance which cannot be separated into simpler substances as a result of any chemical process  Hydrogen and oxygen are elements, but water is not

28. Atom  The smallest particle of a chemical element that can exist  For example, Ag is one of the atoms

29. Molecule  A group of atoms bonded together  For example, H2O is one of the molecules

30. Ion  An atom or molecule with a net electric charge due to the loss or gain of one or more electrons  For example, NO3- is one of the Ions

31. Particle  Used to describe a small bit of matter such as an atom, molecule and iron  There are many particles around our life, it is unhealthy for us

32. Homogenous Substance  The substance consisting of only one phase  For example, water is one of the homogenous substances

33. Heterogeneous substance  The substance consisting of more than one phase  For example, pencil is one of the heterogeneous substances

34. Pure Substance  The substance is homogeneous and has an unchangeable composition  For example, sugar is one of the pure substances

35. Mixture  A substance made by mixing other substances together  When salt dissolved in water, it will be mixture

36. Mechanical Mixture  A heterogeneous mixture of two or more substances  For example, desk is one of the mechanical mixture

37. Solution  It is a homogeneous mixture of two or more substances  Solution includes solvent and solute

38. solvent  Able to dissolve other substances  Water is one of the solvent

39. Solute  The substance that able to be dissolved by other solvents  When salt is dissolved into water, the salt is solute

40. Compound  A thing that is composed of two or more separate elements  For example, salt(sodium chloride) is one of the compound

41. Homogenous Mixture  Changeable composition, but each particular composition has unchanging, uniform physical properties  Coffee is the example of the homogenous mixture

42. Heterogeneous Mixture  Each component present has different physical properties, regardless of composition  When oil mix into water, it will become heterogeneous mixture

43. Filtration  Allow the separation of liquids from solids  We can use filtration to clean water

44. Filtrate  A liquid which has passed through a filter  The filtrate is cleaner than before

45. Residue  A substance that remains after a process such as combustion or evaporation  Residue is solid.

46. Distillation  The separation to separate liquid-in-liquid solution  the distillate is the result during the distillation

47. Solvent Extraction  Extraction of a dissolved liquid or solid from a liquid solution  We can use solvent extraction to separate liquid-in-liquid solution

48. Recrystallization  It is a variation on the method of evaporation in which the solid in a solid-in- liquid solution is separated in a pure and crystalline stated  We can get crystalline during the recrystallization

49. Gravity Separation  Used to separate desired solids from a mechanical mixture(based on their density)  We can use gravity separation to separate the juice, such as watermelon juice

50. Chromatography  An apparatus for performing chromatography  We should use alcohol to do the chromatography

51. Chemical Change  It is a change which create new substances  There is chemical change during the burning

52. Physical Change  It is change in which do not create new substance  Melting is one of the physical change

53. Kinetic Energy  It is energy that many molecules’ motion  There are three types of kinetic energy, they are rotational energy, vibrational energy and translation energy

54. Rotational Energy  Causes a molecule to rotate around one of its axes  Centre of rotation is one of the rotational way

55. Vibrational Energy  Changes the bond lengths and angles between atoms in a molecule  It can move freer than rotational energy

56. Translational Energy  Causes the molecule to travel in a straight line from place to place  It can lets molecules move to anyplaces