Pure substances contain only one kind of matter.

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Presentation transcript:

Pure substances contain only one kind of matter. NaCl Cr Element Compound

Physical Property is a quality or a condition of a substance that can be observed or measured without changing the substance’s composition. Color Size Hardness Density Shape Odor Melting Point Boiling Point

Change in matter without changing the chemical composition. Physical Change Change in matter without changing the chemical composition. Examples: Boiling Cutting Melting Splitting Cracking Condensing Freezing Bending Breaking Grinding Crushing

- Chemical Change – one or more substances changing into a new substance. Signs of a chemical change: 1. Bubbling 2. Change in Temp 3. Color Change 4. Change in Smell

Write the indicators of a chemical change for each of the following: A firecracker explodes A piece of wood burns An antacid tablet is dropped in water

2.2 Mixture Heterogeneous a physical blend of two or more substances. not uniform in composition Examples: Muddy Water Chocolate-Chip Cookie Salad

Solutions are homogeneous mixtures. They consist of one phase. completely uniform in composition Examples: Milk Salt water Solutions are homogeneous mixtures. They consist of one phase.

any part of a system with uniform composition and properties. Phase any part of a system with uniform composition and properties. Heterogeneous mixtures consist of 2 or more phases Homogeneous mixtures consist of one phase

2.3 Element Examples: Al C Hg The simplest form of matter that can exist under normal laboratory conditions. Examples: Al C Hg

Compound Examples: AlCl3 NaCl H2CO3 CH3OH A substance that can be separated into simpler substances only by chemical means. Examples: AlCl3 NaCl H2CO3 CH3OH

Classify the following as an element, compound or mixture: C12H22O11 Table sugar Water Iron Vegetable Soup Salt water O2 CaCO3 Air Compound Element Mixture

mass of reactants = mass of products 2.4 Law of Conservation of Mass Mass is neither created nor destroyed in chemical reactions. mass of reactants = mass of products In a chemical reaction, the numbers and kinds of atoms present in the products are the same as those present in the reactants.

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