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Welcome to Science Class!

Warm-Up Be sure to copy learning target and homework into agenda. We will be discussing the NOTES you wrote for homework about elements and compounds!. Welcome to Science Class!. Before the Bell…. Today, we will be creating brace m aps.

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Welcome to Science Class!

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  1. Warm-Up Be sure to copy learning target and homework into agenda. We will be discussing the NOTES you wrote for homework about elements and compounds! Welcome to Science Class! Before the Bell…

  2. Today, we will be creating brace maps On a blank sheet of paper, use the following compounds to create a brace map. Substance Compound Element # of Atoms Hydrogen 2 Water H2O Oxygen 1 EXAMPLE

  3. Today, we will be creating brace maps On a blank sheet of paper, use the following compounds to create a brace map. Substance Compound Element # of Atoms Hydrogen 2 Water H2O Oxygen 1 EXAMPLE

  4. PAUSE! READ THIS! • Some elements are represented by one letter • Can you find elements in • your periodic table that are • represented by one letter? • Others are represented • by two letters. • Can you find elements in • your periodic table that are • represented by TWO letters? Elements are pure substances that are represented by chemical symbols.

  5. BE CAREFUL! Sometimes one element can have two letters, so don’t get confused! Hint: each element will have at least one capital letter

  6. HOMEWORK! Substance Compound Element # of Atoms Hydrogen 2 Water H2O Oxygen 1 C6H12O6:sugar CaCl2: calcium chloride NaHCO3: sodium bicarbonate (baking soda) CO2: carbon dioxide Mg(OH)2: magnesium hydroxide (milk of magnesia) C2H5OH: ethyl alcohol HCl: hydrochloric acid KMnO4: potassium permanganate NH3: ammonia FeS2: pyrite (fool’s gold)

  7. EXAMPLES MORE Substance Compound Element # of Atoms Sodium1 SodiumHydrogen 1 Bicarbonate NaHCO3 Carbon 1 Oxygen 3

  8. EXAMPLES MORE Substance Compound   Element     # of Atoms Magnesium1 Magnesium Oxygen2 HydroxideMg(OH)2 Hydrogen 2 When there is a parenthesis like this (OH)2,then the subscript changes the elements inside the parentheses. That is why there are 2 atoms of OxygenAND2 atoms of Hydrogen

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