A student was given a pure substance to identity. He took note of the color and state of the substance and determined the mass, volume, density and boiling point. Which of the following is NOT useful in identifying the substance? Select ALL that apply. Color

State

Mass

Volume

Density

Boiling point

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

Sugar is dissolved in water. which is the solute? sugar neither both water

Which statement best explains the relationship between an area is geography and the temperature of its surface water