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Symbols, Formulas , Equations , etc

Symbols, Formulas , Equations , etc. Symbols, Formulas, Equations , etc. The Chemical Language is international; represents atoms, elements and compounds All matter in the universe either is an element or is made of some combination of elements. Identify the parts of the following:. Vocab.

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Symbols, Formulas , Equations , etc

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  1. Symbols, Formulas, Equations, etc

  2. Symbols, Formulas, Equations, etc. • The Chemical Language is international; represents atoms, elements and compounds • All matter in the universe either is an element or is made of some combination of elements.

  3. Identify the parts of the following:

  4. Vocab • Chemical symbols • 1 or 2 letters used to represent elements, 1st letter is capital. Used by scientists all over the world. • Chemical formula • Tells what atoms and how many are in a compound • Subscript • the small number that tells the number of atoms in an element. • Chemical Equation • Tells what happens during a reaction

  5. Chemical Reaction • The process of forming new substances from reactants • The breaking and forming of new chemical bonds • Reactants • The starting items in a reaction • Located on the LEFT side of the equation

  6. Products • The items made in a reaction • Located on the RIGHT side of the equation • Balanced Reaction • The total number of each type of atom is the same for the reactants and the products

  7. Think about it… • What is H2O(l)? H2O(g)? H2O(s)? • What do all the vials with (aq) on them have in common? What do you think aqueous means? • How are NaOH(s) and NaOH(aq) the same? How are they different?

  8. Substances come in different physical forms, called phases. • Phase: The physical form a substance is in, such as solid, liquid, or gas. Phase is greatly influenced by temperature. • Aqueous (aq): A substance that is dissolved in water.

  9. Models • Models – representations of very small or very large items. • Use models when we draw the particles of atoms, etc

  10. Sample Problem 1: Draw a particulate level model of carbon dioxide (CO2).(Hint: Carbon is in the center of the molecule.

  11. Sample Problem 2:  • Write the chemical formula for the element represented by this particulate-level model: • N2

  12. The Elements • Elements on the Periodic Table can be classified in many ways because of their properties. • 2 main classes of elements: • Metals- Left of the zig-zag line • Nonmetals – Right of the zig-zagline • Some elements are metalloids, (on the zig-zag line), have properties of both metals and nonmetals

  13. Describing some properties: • Conductor – • a material that allows electricity (or thermal energy) to flow through it • Nonconductor – •  a material that does not allow electrical current (or thermal energy) to flow through it

  14. Malleable – • a property of a material that permits it to be fattened without shattering • Brittle – • a property of a material that causes it to shatter under pressure

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