Compounds TEKS 6.5A  know that an element is a pure substance represented by chemical symbols TEKS 6.5C  differentiate  be...
Compounds  are substances made of  two or more elements  chemically combined in a set ratio.
Compounds   are ……
<ul><li>made of  more than one  kind of element </li></ul>
<ul><li>broken down during a  chemical reaction </li></ul>
<ul><li>represented with the elements symbols and  subscripts .   </li></ul>H 2 O CO 2
Subscripts tell how  many   atoms  of each element are in the compound.
<ul><li>If there is no subscript, there is only  1 atom of that element . </li></ul>
water =  H 2 O   2  atoms of hydrogen  1 atom of oxygen Examples:
carbon dioxide = CO 2 1 atom of carbon 2 atoms  of oxygen
glucose = C 6 H 12 O 6   6 atoms of carbon 12 atoms  of hydrogen 6 atoms  of oxygen
Substance Element Compound Why? CaCl 2  two different elements are combined, Ca and Cl NaCl H 2 He CaCO 3 HCl
Substance Element Compound Why? CaCl 2  two different elements are combined, Ca and Cl NaCl  two different elements are ...
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Compound notes

  1. 1. Compounds TEKS 6.5A know that an element is a pure substance represented by chemical symbols TEKS 6.5C differentiate between elements and compounds on the most basic level
  2. 2. Compounds are substances made of two or more elements chemically combined in a set ratio.
  3. 3. Compounds are ……
  4. 4. <ul><li>made of more than one kind of element </li></ul>
  5. 5. <ul><li>broken down during a chemical reaction </li></ul>
  6. 6. <ul><li>represented with the elements symbols and subscripts . </li></ul>H 2 O CO 2
  7. 7. Subscripts tell how many atoms of each element are in the compound.
  8. 8. <ul><li>If there is no subscript, there is only 1 atom of that element . </li></ul>
  9. 9. water = H 2 O 2 atoms of hydrogen 1 atom of oxygen Examples:
  10. 10. carbon dioxide = CO 2 1 atom of carbon 2 atoms of oxygen
  11. 11. glucose = C 6 H 12 O 6 6 atoms of carbon 12 atoms of hydrogen 6 atoms of oxygen
  12. 12. Substance Element Compound Why? CaCl 2  two different elements are combined, Ca and Cl NaCl H 2 He CaCO 3 HCl
  13. 13. Substance Element Compound Why? CaCl 2  two different elements are combined, Ca and Cl NaCl  two different elements are combined, Na and Cl H 2  only hydrogen is present, but there are two atoms of this element He  one kind of element is present CaCO 3  three different elements are combined, Ca, C and O HCl  two different elements are combined, H and Cl

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