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Premium member Presentation Transcript Compounds, Mixtures, and Reactions : Compounds, Mixtures, and Reactions Unit II-Part 5 Classifying Matter : Classifying Matter Matter Pure Substances Mixtures Elements Compounds Homogeneous Heterogeneous Fe, O H2O, CO2 milk, tea Rocky Road ice cream, muddy water What is a Pure Substance? : What is a Pure Substance? A pure substance is a classification of matter that includes both elements and compounds Pure substances cannot be separated by physical means such as distillation, filtration, or chromatography Slide 4: Elements We have already studied elements An element is made of one kind of atom Found on the periodic table What Is A Compound? : What Is A Compound? A compound is a pure substance that is created by 2 or more elements chemically reacting and joining together Ex: NaCl, H2O, CO2, NH3, NaHCO3, and C6H12O6 Notice that elements combine in many ways to make compounds Ex: H2O, H2O2, CO, and CO2 Why Do Compounds Form? : Why Do Compounds Form? Compounds form to allow elements to become more stable Na is flammable when it comes in contact with H2O, and Cl2 is a toxic gas NaCl is a very stable compound that is neither flammable nor toxic (in normal quantities) Compounds that are extremely unstable will break down to form the more stable elements How Do Compounds Form? : How Do Compounds Form? Compounds form by the interaction between the nuclei and valence electrons of 2 or more elements THE OCTET RULE: an element is most stable with 8 valence electrons Elements will join chemically to get 8 valence electrons Ex: CO2 : oxygen has 6 valence electrons and carbon has 4 If the carbon shares 2 with each oxygen, everyone will have 8 valence electrons! What Do Compounds Have To Do With My Life? : What Do Compounds Have To Do With My Life? Compounds are the substances that make up ALL living and non-living things Examples: Where would you be without: H2O—water NaCl—table salt C3H8O—rubbing alcohol C55H98O6—an example of an unsaturated fat What Is A Mixture? : What Is A Mixture? A mixture is the physical combination of 2 or more substances It is important to understand that a mixture is not chemically combined Mixtures can be separated by physical means such as filtration, distillation, and chromatography Mixtures can be divided into 2 groups Homogenous mixtures Heterogeneous mixtures How Do Mixtures Form? : How Do Mixtures Form? Mixtures form by physically “junking” 2 or more substances together Remember no chemical change is occurring The formation of a mixture is not a result of lowering energy What Is a Homogenous Mixture? : What Is a Homogenous Mixture? A homogeneous mixture is a mixture that is evenly distributed Homogeneous mixtures are commonly called solutions. Solution = Solute + Solvent Solute: “stuff” being dissolved Solvent: “stuff” doing the dissolving The solvent is present in greater quantity The solute is present in the lesser quantity Ex: Salt water: Salt=solute, Water=solvent What Is a Heterogeneous Mixture? : What Is a Heterogeneous Mixture? A heterogeneous mixture is a mixture that is unevenly distributed. Examples: Iced tea: The ice is floating at the top and therefore is not evenly distributed throughout the tea Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore, the mixture is unevenly distributed How Are Mixtures Important To My Life? : How Are Mixtures Important To My Life? We encounter mixtures everywhere in our lives Where would you be without: Ice cream Kool-aid Shampoo Soup Milk Orange juice How Can We Change Matter Into New Substances? : How Can We Change Matter Into New Substances? Chemical reaction (also known as a chemical change) is a change in a substance or substances that results in a totally new substance Ex: 2H2(g) + O2(g) 2H2O(g) Notice that the reactants (the substances you start with) combine to form a new substance (the product) How Do I Know If A Chemical Reaction Has Occurred? : How Do I Know If A Chemical Reaction Has Occurred? There are 5 indicators of a chemical reaction Evolution of a gas Evolution of light Evolution of heat Color change Evolution of a precipitate Precipitate: an insoluble substance that is produced as result of a chemical reaction Why Do Chemical Reactions Occur? : Why Do Chemical Reactions Occur? Chemical reactions occur to produce a more stable product than the existing reactants Ex: 2Na(s) + Cl2(g) 2NaCl(s) *The sodium is highly unstable and the chlorine gas is somewhat unstable. The resulting Sodium Chloride is VERY stable. **It is important to understand that the products have totally different properties than the reactants Where Does The Matter Go? : Where Does The Matter Go? It is important to understand that when matter undergoes a chemical reaction (ie a chemical change) it does not disappear or appear The atoms are rearranged and form new bonds, but no matter is lost nor gained This is called the Law of Conservation of Matter What Kind of Chemical Reactions Do I Experience? : What Kind of Chemical Reactions Do I Experience? The acidic milk and basic baking soda that produce CO2 gas when a cake bakes Paper burning to produce ashes, CO2, and H2O vapor Hydrogen peroxide decomposing to produce water and oxygen gas You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Compounds and Mixtures mswage Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 3097 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: October 17, 2008 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Compounds, Mixtures, and Reactions : Compounds, Mixtures, and Reactions Unit II-Part 5 Classifying Matter : Classifying Matter Matter Pure Substances Mixtures Elements Compounds Homogeneous Heterogeneous Fe, O H2O, CO2 milk, tea Rocky Road ice cream, muddy water What is a Pure Substance? : What is a Pure Substance? A pure substance is a classification of matter that includes both elements and compounds Pure substances cannot be separated by physical means such as distillation, filtration, or chromatography Slide 4: Elements We have already studied elements An element is made of one kind of atom Found on the periodic table What Is A Compound? : What Is A Compound? A compound is a pure substance that is created by 2 or more elements chemically reacting and joining together Ex: NaCl, H2O, CO2, NH3, NaHCO3, and C6H12O6 Notice that elements combine in many ways to make compounds Ex: H2O, H2O2, CO, and CO2 Why Do Compounds Form? : Why Do Compounds Form? Compounds form to allow elements to become more stable Na is flammable when it comes in contact with H2O, and Cl2 is a toxic gas NaCl is a very stable compound that is neither flammable nor toxic (in normal quantities) Compounds that are extremely unstable will break down to form the more stable elements How Do Compounds Form? : How Do Compounds Form? Compounds form by the interaction between the nuclei and valence electrons of 2 or more elements THE OCTET RULE: an element is most stable with 8 valence electrons Elements will join chemically to get 8 valence electrons Ex: CO2 : oxygen has 6 valence electrons and carbon has 4 If the carbon shares 2 with each oxygen, everyone will have 8 valence electrons! What Do Compounds Have To Do With My Life? : What Do Compounds Have To Do With My Life? Compounds are the substances that make up ALL living and non-living things Examples: Where would you be without: H2O—water NaCl—table salt C3H8O—rubbing alcohol C55H98O6—an example of an unsaturated fat What Is A Mixture? : What Is A Mixture? A mixture is the physical combination of 2 or more substances It is important to understand that a mixture is not chemically combined Mixtures can be separated by physical means such as filtration, distillation, and chromatography Mixtures can be divided into 2 groups Homogenous mixtures Heterogeneous mixtures How Do Mixtures Form? : How Do Mixtures Form? Mixtures form by physically “junking” 2 or more substances together Remember no chemical change is occurring The formation of a mixture is not a result of lowering energy What Is a Homogenous Mixture? : What Is a Homogenous Mixture? A homogeneous mixture is a mixture that is evenly distributed Homogeneous mixtures are commonly called solutions. Solution = Solute + Solvent Solute: “stuff” being dissolved Solvent: “stuff” doing the dissolving The solvent is present in greater quantity The solute is present in the lesser quantity Ex: Salt water: Salt=solute, Water=solvent What Is a Heterogeneous Mixture? : What Is a Heterogeneous Mixture? A heterogeneous mixture is a mixture that is unevenly distributed. Examples: Iced tea: The ice is floating at the top and therefore is not evenly distributed throughout the tea Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore, the mixture is unevenly distributed How Are Mixtures Important To My Life? : How Are Mixtures Important To My Life? We encounter mixtures everywhere in our lives Where would you be without: Ice cream Kool-aid Shampoo Soup Milk Orange juice How Can We Change Matter Into New Substances? : How Can We Change Matter Into New Substances? Chemical reaction (also known as a chemical change) is a change in a substance or substances that results in a totally new substance Ex: 2H2(g) + O2(g) 2H2O(g) Notice that the reactants (the substances you start with) combine to form a new substance (the product) How Do I Know If A Chemical Reaction Has Occurred? : How Do I Know If A Chemical Reaction Has Occurred? There are 5 indicators of a chemical reaction Evolution of a gas Evolution of light Evolution of heat Color change Evolution of a precipitate Precipitate: an insoluble substance that is produced as result of a chemical reaction Why Do Chemical Reactions Occur? : Why Do Chemical Reactions Occur? Chemical reactions occur to produce a more stable product than the existing reactants Ex: 2Na(s) + Cl2(g) 2NaCl(s) *The sodium is highly unstable and the chlorine gas is somewhat unstable. The resulting Sodium Chloride is VERY stable. **It is important to understand that the products have totally different properties than the reactants Where Does The Matter Go? : Where Does The Matter Go? It is important to understand that when matter undergoes a chemical reaction (ie a chemical change) it does not disappear or appear The atoms are rearranged and form new bonds, but no matter is lost nor gained This is called the Law of Conservation of Matter What Kind of Chemical Reactions Do I Experience? : What Kind of Chemical Reactions Do I Experience? The acidic milk and basic baking soda that produce CO2 gas when a cake bakes Paper burning to produce ashes, CO2, and H2O vapor Hydrogen peroxide decomposing to produce water and oxygen gas