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Elements, compounds Mixtures

Elements, compounds Mixtures. Physical VS Chemical. Elements. Only 1 kind of atom Cannot be broken down into simpler form An atom of gold ONLY has gold atoms . . Compounds. form when 2 or more different types of atoms are chemically bonded

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Elements, compounds Mixtures

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  1. Elements, compoundsMixtures Physical VS Chemical

  2. Elements Only 1 kind of atom Cannot be broken down into simpler form An atom of gold ONLY has gold atoms.

  3. Compounds • form when 2 or more different types of atoms are chemically bonded • Compounds are made from elements

  4. Compounds elements in compound lose their chemical properties. New compound with NEW properties is formed Ratio between the parts of a compound is a fixed amount. Any other amount makes it a new compound Energy is always taken in or given off when a compound is put together or broken apart

  5. Compounds Can ONLY be separated with a chemical reaction FOR EXAMPLE: Electrolysis changes water into hydrogen and oxygen

  6. Mixtures Two or more DIFFERENT kinds of atoms or compoundsphysically put together. NO chemical reaction necessary Ratio can be any amount

  7. Mixtures: Parts of a mixture do not change their properties Energy is not given off or taken in when a mixture is made or separated Mixture can be separated by physical means.

  8. Types of Mixtures • Homogeneous • substances combine so mixture is same throughout • Ex. Chocolate milk, pudding, Kool-aid and water • Heterogeneous • substances combine but remain visible to physically separate • Ex. Pizza, salad nachos

  9. Solution a type of mixture with two parts. 1. Solute: the substance being dissolved in liquid (powder) 2. Solvent: the substance doing the dissolving (liquid, water)

  10. Chemical Formulas • Represent compounds that are made during a chemical reaction (H20, Fe203) • Compounds are made of chemicals • Compounds are chemicallybonded together • A chemical formula tells what elements are bonded together in the compound

  11. Chemical Formulas • tells how many atoms of each element are bonded in a molecule of a compound

  12. Physical Property a. Characteristics determined with your senses b. Do not change identity of substance to describe physical properties c. No new substance is created

  13. Physical Change Change in the physical property of a substance Atoms not rearranged Change in size, shape, color, mass/weight, texture, taste

  14. Chemical Properties Describe how substances react with one another

  15. Chemical Change • A change from one substance into another is a chemical change • Atoms in original substances are rearranged to make new substances • A new substance is always formed in a chemical reaction.

  16. 5 Signs of a Chemical Change Odor produced: egg rotting produces smell of sulfur Temperature change: logs burning produce heat energy Color change: fruit turns brown Bubbles form: antacid tablet creates gas bubbles Solid forms: body fluids from sea animals combines with seawater to form shells

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