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Physical Science Notes 416-436

Chemical and Physical Changes and Properties

Tips and Tricks
Chemical and Physical Changes and properties
Periodic Table of the Elements: Properties of Elements
Atomic Theories and discoveries
Bohr Model
The Naming of Binary Compounds
Octet Rule/Elemental Happiness
Balancing Chemical Equations
pH Math
Acid Rain
Review Questions
Review tests
Testing for H2, CO2 and O2 Lab
Conductivity Lab
Colour your world Lab
pH Lab
Isn't it Ionic Lab
Titration Lab 1 and 2
How to write a lab report
Tutoring Schedule
Fun Facts
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You see changes happening all the time, now you can understand what is happening



-Physical change:

                                -Nothing new is made

                                -No new rearrangement of the atoms


E.g.: H2O(l) ----->H2O(g)

E.g.: tearing paper


Solid-Liquid: melting

Solid-Gas: sublimation

Liquid-Solid: freezing

Liquid-Gas: evaporation

Gas-Solid: sublimation

Gas-Liquid: precipitation

E.g.: Trauma

E.g.: dissolving


-Chemical Change:

                        -Making something new, different


            4 evidences(signs) of chemical change

1)       formation of a gas

2)       formation of a precipitate (PPT or solid)

3)       change in colour

4)       production of heat energy (E) + light E



            -A trait

            -A quality

            -A way of being

            -2 types


-Physical Properties = appearance

            -2 types: a) Qualitative


                                    E.g.: colour, taste, texture, odor, shape etc.

                        b) Quantitative


                                    E.g.: density, melting point(mp), boiling point(bp)                                              solubility etc.



-Chemical Properties = personality

            -Describe how a substance interacts with another element

                                    E.g.: BS (baking soda) + vinegar------->CO2

                                                        BS reacts with vinegar to make CO2

                                    E.g.: iron rusting

                                             Fe + O2-------->rust



-Non-characteristic properties = a way of being or reacting that is common to a lot of                                                            substances.

            -You cannot identify a substance by colour, shape etc.

                                    E.g.: 5 fingers, colour, shape etc


-Characteristic properties = when it is specific to a given substance

                        E.g.: CO2 turns Lime Water (LW) cloudy

                        E.g.: O2 relights a glowing splint

                        E.g.: density, melting point, boiling point, solubility etc.

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