2. Which is true of all elements? A. They have no physical properties
B. They are solids at room temperature.
C. They break down during chemical reactions.
D. They are each composed of only one kind of atoms.

How many miles of water are produced if 5.43 mol pbo2 are consumed

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

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