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7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
7th Grade Chapter 4 Lesson 3
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7th Grade Chapter 4 Lesson 3

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  • 1.  
  • 2. <ul><li>Chemistry is the study of composition, structure, and properties of matter, as well as the changes which matter under-goes. </li></ul><ul><li>Mixture: consist of two or more substances that retain their chemical and physical properties when mixed together </li></ul>
  • 3. <ul><li>Mixtures: </li></ul><ul><ul><li>The substances are not chemically mixed or changed chemically </li></ul></ul><ul><ul><li>Salt and pepper will mix but never chemically join </li></ul></ul><ul><li>Compounds: </li></ul><ul><ul><li>A new substance formed from the chemical union of two or more elements. </li></ul></ul>
  • 4. <ul><li>Chemical Bonding: </li></ul><ul><ul><li>Atoms want to achieve stability </li></ul></ul><ul><ul><li>Valence electrons: electrons in an atom’s last unfilled electron shell </li></ul></ul><ul><ul><li>When an atom achieves 8 electrons in outer most shell it is considered stable </li></ul></ul><ul><ul><ul><li>Different atoms have different numbers of valence electrons </li></ul></ul></ul>
  • 5. <ul><li>Chemical Bonding: </li></ul><ul><ul><li>Ion- charged particle results from the loss or gain of electrons </li></ul></ul><ul><ul><li>Ionic Bond- a chemical bond in which electrons are completely transferred from one atom to another </li></ul></ul><ul><ul><li>Positive and Negative bonding </li></ul></ul><ul><ul><ul><li>NaCl= sodium chloride </li></ul></ul></ul>
  • 6. <ul><li>Chemical Bonding: </li></ul><ul><ul><li>Covalent Bond: </li></ul></ul><ul><ul><ul><li>Atoms share electrons in order to in order to complete their outer shells </li></ul></ul></ul><ul><ul><ul><li>Share electrons </li></ul></ul></ul><ul><ul><ul><li>H 2 O= covalent bonding </li></ul></ul></ul>
  • 7. <ul><li>Chemical Reaction: </li></ul><ul><ul><li>This is the representation of a chemical reaction in terms of chemical symbols </li></ul></ul><ul><ul><li>Baking a cake- has chemical reactions </li></ul></ul><ul><li>Chemical Breakdown: </li></ul><ul><ul><li>Substances can also decompose or break apart </li></ul></ul><ul><ul><li>Electrolysis is a way to chemically spilt </li></ul></ul>

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