Earth appears to be mostly blue when viewed from space because it is mostly covered by
a) water
b) oxygen
c) carbon dioxide
d) ozone

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

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Distilled water is a completely neutral solution. what is its ph? a. 1 b. 7 c. 14 d. 0