Consider the following reaction: 2D + 3F2 --> 2DF3. What is a reasonable guess for the identity of element D? (Your answer doesn't need to be specific to a single element - a particular group or portion of a particular group is fine.)

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?

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