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Unit 2 Review Describing and Classifying Matter

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

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

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

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

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

6 Nitrogen Boron Cobalt Zinc Sulfur

7 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

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

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

10 Pizza Coffee Nail Polish Milk

11 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

12 Compounds and Mixtures
The difference between compounds and mixtures

13 The Differences Physically combined
Mixtures Physically combined Physically or mechanically separated Keeps original properties Either homogenous or heterogeneous Compounds Chemically combined Chemically separated Does not always keep original properties When 2 or more atoms bond in a chemical reaction Homogenous

14 Solubility

15 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

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

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

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

19 heterogeneous

20 Homogeneous and Heterogeneous
Same and DIfferent

21 Homogeneous The same Because they all look the same.

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

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

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

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

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

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

28 Raspberries (not in the crate) are heterogeneous.

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

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

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

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

33 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.

34 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.

35 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.

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.

37 Elements, Compounds, Mixtures
By: Amanda Bauer and Marianne Galbraith

38 Compounds 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.

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

40 Properties of Mixtures
Mixtures keep their original properties. Mixtures have no definite amount. You can physically separate them.

41 Elements 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.

42 Phase Change By Kelly Krause

43 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

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

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

46 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

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

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

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

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

51 Compounds and Mixtures
By: MacKenzie Moore and Andi Holmes

52 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

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

54 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

55 When you add energy, Solid’s go to liquids (melting)
Liquid’s go to gasses (Vaporization) And sometimes Solid’s go to gasses. (Sublimation)

56 When you take away energy,
Gasses go to liquids. (condensation) Liquids go to Solids. (Freezing)

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

58 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

59 Examples of Compounds

60 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

61 Examples of Mixtures

62 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

63 Examples of Elements

64 Chemical and Physical Changes
Created By: Uriel & Baleigh

65 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.

66 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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