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Compound Vocabulary

Compound Vocabulary. Evidence of a chemical reaction. Precipitate Forms.

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Compound Vocabulary

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  1. Compound Vocabulary Evidence of a chemical reaction

  2. Precipitate Forms A precipitate is a solid which is formed when two liquids are combined and then react. It is a different substance to either of the reactants and does not dissolve in the reaction mixture. It may either sink to the bottom or remain suspended within the solution. The precipitate can generally be identified by looking at solubility rules: Certain groups of compounds are soluble in water, whereas others aren't.

  3. Gas Produced A gas can be formed when two liquids are combined, or when a solid is added to a liquid. Sometimes this gas has an odor and other times it doesn't. It is generally visible as bubbles rising to the surface of the reaction mixture, but the gas can also be soluble. If this is the case it is generally very difficult to see its formation in the mixture.

  4. Temperature Change It is very common for the substances involved in a chemical reaction to produce a change in temperature. This does not come from an external heat source, but instead is generated by an energy change within the reaction. The chemical change can cause either an increase or a decrease in the temperature of the reaction mixture.

  5. Color Change Color changes are commonplace when substances are combined, but one of the identifying factors of a chemical reaction is an unexpected color change. For example, it would be expected that a blue and a yellow liquid would combine to produce a green liquid. However, if the same two liquids created a red product, that would be evidence of a chemical reaction. This can happen between two liquids and also when a solid dissolves into a liquid.

  6. Counting Elements and Atoms in a Compound Using chemical symbols and subscripts

  7. Number of Elements There are 3 elements in the compound, Magnesium Hydroxide. • Magnesium • Oxygen • hydrogen MgO2H2 3 elements

  8. Number of Atoms The subscripts represents the number of atoms of the previous element MgO2H2

  9. Number of Atoms The subscript 2 follows the chemical symbol for oxygen (O). This tells us there are 2 oxygen atoms in a single molecule of Magnesium Hydroxide MgO2H2

  10. Number of Atoms If there is no subscript following the element, it is assumed the compound only has 1 atom of the element. MgO2H2 1

  11. Number of Atoms The total number of atoms for each element are as follows: • Mg = Magnesium (1 atoms) • O = Oxygen (2 atoms) • H = Hydrogen (2 atoms) Total atoms = 5 Total elements = 3 MgO2H2 1 Mg=1 O=2 H=2

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