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2 Substances, Compounds & Mixtures How everything is put together.
3 Substances! Matter that has the same composition and properties throughout is called a substance. When different elements combine, other substances are formed.
4 Substances Picture from statesofmatter.gif! Contains only one particle! Can exist in 3 states of matter! Can be elements or compounds
5 Compounds! A compound is a substance whose smallest unit is made up of atoms of more than one element bonded together. Compounds often have properties that are different from the elements that make them up. Examples: Water, salt, sugar
6 Compounds! A compound is a substance whose smallest unit is made up of atoms of more than one element bonded together. Compounds often have properties that are different from the elements that make them up. Examples: Water, salt, sugar
7 Compounds Have Formulas! H 2 0 is the chemical formula for water, and H 2 O 2 is the formula for hydrogen peroxide.! The formula tells you which elements make up a compound as well as how many atoms of each element are present.
8 Compounds Have Formulas! H 2 0 is the chemical formula for water, and H 2 O 2 is the formula for hydrogen peroxide.! The formula tells you which elements make up a compound as well as how many atoms of each element are present.
9 How to read a formula H 2 0 This is a subscript. It tells us how many atoms of that element exist in one unit of that compound. Hydrogen is made of 2 H atoms and 1 O atom. No subscript is used when only one atom of an element is present.
10 How to read a formula H 2 0 This is a subscript. It tells us how many atoms of that element exist in one unit of that compound. Hydrogen is made of 2 H atoms and 1 O atom. No subscript is used when only one atom of an element is present.
11 Let s try it! Using your white board tell how many atoms there are in each element.! Sulfuric Acid H 2 SO 4! 2 Hydrogen! 4 Oxygen! Hydrogen Peroxide H 2 O 2
12 And some more formulas! Carbon Dioxide CO 2! 1 Carbon! 2 Oxygen! Carbon Monoxide CO! 1 Carbon! 1 Oxygen! Calcium Carbonate (Found in shells, eggshells, antacid) CaCO 3! 1 Calcium! 1 Carbon! 3 Oxygen
13 Compound Review! A pure compound has the same elements and the same amount of elements all of the time! Elements are chemically combined! Compound properties are different from the properties of the elements! They cannot be separated physically! Physical properties such as boiling point or melting point of pure substances are do not change
14 Mixtures! A mixture is a combination of two or more substances where there is no chemical combination or reaction.
15 A mixture is a combination of two or more substances where there is no chemical
16 Mixtures combine physically in no specific proportions. They just mix.
17 Solids, liquids and gases can be combined to create a mixture.
18 Mixture Types!MIXTURES MAY BE HOMOGENEOUS OR HETEROGENEOUS
19 Homogeneous Mixtures! Homogeneous Mixtures:! The prefix: "homo"- indicates the same! Have the same uniform appearance and composition throughout
20 Solutions!SOLUTIONS are homogeneous mixtures
21 What is a solution?!a solution is a mixture of two or more substances.!at least two substances must be mixed in order to
22 A solution has two parts! The substance in the smallest amount and the one that DISSOLVES is called the SOLUTE!The substance in the larger amount is called the SOLVENT - it does the dissolving!in most common instances water is the solvent
23 Examples of solutions!salt water!clean Air!Vinegar
24 Heterogeneous Mixtures:!The prefix: "hetero"- indicates difference!a heterogeneous mixture consists of visibly different substances or phases!two or more parts can be seen
25 Examples:! Pizza! Sandwich! Chex Mix
26 Suspensions! A SUSPENSION is a heterogeneous mixture of large particles! These particles are visible and will settle out on standing! Examples of suspensions are: fine sand or silt in
27 Compounds vs Mixtures Compounds Mixtures Combine chemically forming molecules Combine in set proportions Separated chemically Not chemically combined Can combine in any proportion Separated physically
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