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Physical Science Notes 416-436

Chemical and Physical Changes and Properties

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You see changes happening all the time, now you can understand what is happening

Changes

 

-Physical change:

                                -Nothing new is made

                                -No new rearrangement of the atoms

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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

 

Properties

            -A trait

            -A quality

            -A way of being

            -2 types

 

-Physical Properties = appearance

            -2 types: a) Qualitative

                                    -Senses

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

                        b) Quantitative

                                    -Measurements

                                    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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