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Unit 2 Review Describing and Classifying Matter Created by the 8 th grade students.

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Presentation on theme: "Unit 2 Review Describing and Classifying Matter Created by the 8 th grade students."— Presentation transcript:


2 Unit 2 Review Describing and Classifying Matter Created by the 8 th grade students

3 Chemical Property Is a change that forms a new substance. Ex: Eating food, Rusting, Burning, By: Sam, Will, Magali

4 Physical Property The substance stays the same, but the appearance is altered. Ex: Melting Breaking, Changing States

5 Elements, Compounds, and Mixtures By Kelly, Elsa and Rosa

6 Elements A pure substance that cannot be broken down further- already in simplest form Cobalt Iron Nickel Zinc Nitrogen Copper Lead Sulfur Boron Silicon

7 Cobalt Boron Sulfur Zinc Nitrogen

8 Compounds pure substance composed of two or more elements that are chemically combine Table salt- sodium and chlorine Water- hydrogen and oxygen Sugar- carbon, hydrogen, and oxygen Carbon dioxide- carbon and oxygen Baking soda- sodium, hydrogen, carbon, and oxygen An unfrosted chocolate cake Ice cream

9 Carbon Dioxide Table Salt Sugar Baking Soda Water Ice Cream Unfrosted chocolate cake

10 Mixture A combination of two or substances that are not chemically combined Coffee Soil Soup Pizza Milk Nail Polish

11 Pizza Coffee Nail Polish Milk

12 Element: A pure substance that cannot be separated or broken down into simpler substances by physical or chemical means Compound: A pure substance composed of two or more elements chemically combine

13 Compounds and Mixtures The difference between compounds and mixtures

14 The Differences

15 Solubility

16 Ability of a substance to dissolve into water It is a physical change Makes a solution; a type of mixture Increases as the temperature of water does Solute- what is being dissolved; example: sugar Solvent- does the dissolving; example: water

17 Scientific Terms Winston S. Andrew S. Hanna T. Lara H.

18 Heterogeneous The substance appears different The substance appears different Cake Cake Pizza Pizza Soup Soup Sandwiches Sandwiches Chocolate Chip cookies Chocolate Chip cookies

19 Homogeneous The substance appears the same through out it Chocolate ice cream Milk Hershey’s Kiss Mashed potatoes Water

20 heterogeneous

21 Homogeneous and Heterogeneous Same and DIfferent

22 Homogeneous The same Because they all look the same.

23 Heterogeneous Different Because the leaves and actual fruit have different appearances.

24 Heterogeneous Different Because it has the meat bun and mustard which is all different.

25 Homogeneous vs. Heterogeneous By Ariella, Aviva, and Dain

26 Bread with crust is Heterogeneous! Bread without crust is homogeneous!

27 Cantaloupe is Heterogeneous because there are seeds, fruit, and skin on the outside.

28 Chocolate without the wrapper is homogeneous because it is just chocolate!

29 Raspberries (not in the crate) are heterogeneous.

30 An egg is heterogeneous. There is the shell, the yolk, and the white.

31 A peanut butter and jelly sandwich is heterogeneous because it has bread, crust, jelly, and peanut butter. (Ariella likes butter too!)

32 Thanks for Learning about food! (DO WELL ON THE TEST)

33 SOLUBILITY A presentation brought to you by Chase N. Bowlin

34 Solubility- the measure of how much of a substance will dissolve in a given volume of water. Solubility is a physical change and is dissolving sugar, salt,ect. In water Also it is- The ability to dissolve in another substance, more specifically, the amount of solute needed to make saturated solution using a given amount of solvent at a certain temperature.

35 Facts and examples High solubility: sugar dissolves readily in water Low solubility: sugar does not dissolve easily in water Compounds have either high or low solubility Examples sugar in water=a very strong solvent depending on how much sugar you put in.

36 Substances being Soluble If a substance is soluble it means that that substance has the ability to be dissolved into another substance like salt. Salt is an example because it can be dissolved into water that is hot.

37 If a substance is INSOLUBLE It means that substance DOES NOT have the ability to be dissolved. OIL is a great example of an insoluble substance because when oil is pored into a beaker full of water the oil forms clots and floats to the surface thus rendering the substance INSOLUBLE.


39 Compounds are chemically combined/seperated. Compounds are made of two or more Elements. Different properties from Elements that formed it. Compounds can be identified by physical and chemical properties.

40 Mixtures can be physically seperated. Mixtures keep their original properties. No definite ratio (no exact amount)

41 Mixtures keep their original properties. Mixtures have no definite amount. You can physically separate them.

42 Elements are pure substances. Elements can not be seperated by physical or chemical means. Each Element only contains one particle. Elements are in three groups, metals, non metals, and metalloids.

43 Phase Change By Kelly Krause

44 Phase Changing Plateaus because the phase change has to happen When energy is being added the substance will get hotter When energy is being taken away the substance will get colder

45 Condensation Vs Vaporization Condensation and Vaporization happen at the same time Vaporization is liquid turning to a gas

46 Sublimation Sublimation is a solid turning to a gas An example is Dry Ice

47 Freezing, Melting, Boiling and Vaporization Freezing- Liquid turning into a solid Melting- Solid turning into a liquid Vaporization- Liquid turning into a gas Boiling- Liquid to gas

48 Examples Melting- Ice to water Freezing- Water to ice Sublimation- Dry ice Boiling- Liquid to gas

49 Physical & Chemical properties By: Tim, Otto, Reyna

50 Physical Properties Physical properties of matter can be observes or measured without changing the identity of the matter.

51 Chemical properties Chemical properties describe a substance based on its ability to change into a new substance with different properties.

52 Compounds and Mixtures By: MacKenzie Moore and Andi Holmes

53 Compounds Chemically combined Own set of properties Made of 2 or more substances Definite Ratios Can not be physically seperated Not on the Periodic Table

54 Mixtures Made of 2 or more substances Not on the Periodic Table Physically combined Can be physically seperated No specific ratios

55 Compounds vs. Mixtures Chemically combined Definite ratio Can not be physically seperated Not on periodic table Do not retain original properties 2 or more substances Physically combined No definite ratio Can be physically seperated Not on periodic table Retains their original properties 2 or more substances

56  Solid’s go to liquids (melting)  Liquid’s go to gasses (Vaporization)  And sometimes Solid’s go to gasses. (Sublimation)

57  Gasses go to liquids. (condensation)  Liquids go to Solids. (Freezing)

58  All states of matter must change states before temperature rises.  ALL CHANGES ARE PHYSICAL!  NOT CHEMICAL! GET THAT STRAIT!!!

59 Compounds Chemically combined Two or more elements together Cannot be physically separated The new characteristics are completely different than the original elements New set of chemical and physical properties New set of chemical and physical changes Definite amount of each element

60 Examples of Compounds

61 Mixtures Two or more substances physically combined Can be separated by physical means Random amount of elements and compounds Each substance keeps their own physical and chemical properties All of the substances still have their own physical and chemical changes

62 Examples of Mixtures

63 Elements Pure substances Cannot be broken down Are always on the Periodic Table of Elements Whatever amount of the element there is, the atoms are always the same Unique chemical and physical properties Unique chemical and physical changes

64 Examples of Elements

65 Chemical and Physical Changes Created By: Uriel & Baleigh

66 Definitions – Changes Chemical Change – A chemical change is when an object turns into something new. Example: Burning an object to change it into something new. Physical Change – Changing the way a substance looks. Example: Changing the color of an object.

67 Definitions – Properties Chemical Property – The ability to change a substance from one object to another. Example: Flammability Physical Property – A physical characteristic of an object. An object’s appearance. Example: Color

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