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4 Written questions

3 Multiple choice questions

  1. colorless, odorless, tasteless gas, makes up 21% of air, reacts with materials that burn in air, combines with many other elements
  2. pale, green, poisonous gas, has an odor, nonmetal, very reactive
  3. chemical name is dihydrogen monoxide, covers 70% of the earth's surface, makes up 70% of the mass of the human body, occurs in all 3 common states of matter, is stable

3 True/False questions

  1. stabletwo dangerous elements can combine to form a ______ (or safe) substance

          

  2. aqueous solutionwhite solid at room temperature, brittle crystals, dissolves easily in water, unreactive

          

  3. hydrogencolorless, odorless, tasteless gas, makes up 21% of air, reacts with materials that burn in air, combines with many other elements

          

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