MC chpt. 7
Terms
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- a chemical compound is represented by a
- formula
- to indicate the number of atoms of an element in a compound, you use
- a subscript to the right of the symbol
- in the formula (NH4)2SO4 the number of atoms of sulfur present is
- 1
- when using the crisscross method for writing formulas, the valence number of the nonmental
- follows the symbol for the metal
- in writing a formula when the valence numbers of both the metal and the nonmetal in a compound are written 1
- no number is written
- when writing a chemical formula, the smbol for the element with a positive valence
- is written first
- the formula for the compound whose formula is ZnS is named
- Zinc Sulfide
- The compound whose formula is Ca(OH)z is named
- calcium hydroxide
- The compound CO2 is best named
- carbon dioxide
- a chemical formula gives no info about
- chemical properties
- the total number of atoms present in one molecule of (NH4)2CO3 is
- 14
- the total atomic mass of an element in a compound is 12. the formula mass of the compound is 100. the percentage of the element in the compound is
- 12%
- the formula H202 represents the compound
- hydrogen peroxide
- when an atom of aluminum with a valence of +3 unites to form a compound, it
- donates 3 electrons