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Which combination will result in a precipitate forming?

What are two definitions of a base in an aqueous solution?

Which atom(s) in the acetic acid (CH3COOH, shown below) is/are sp3 hybridized as identified with the bolded/larger atom(s)?  

The correct name of the compound NCl3 is _____.

For the reaction: H2(g) + C2H4(g) → C2H6(g) a series of experiments were conducted as shown in the table. If the rate law was found to be rate = k[H2][C2H4], what is the missing initial rate (marked with the “?” in the table)? Initial rate / M·s–1 [H2]0 / M [C2H4]0 / M 0.0148 0.125 0.125 0.0301 0.250 0.125     ? 0.250 0.250  

In the compound (NH4)2S2O3, which element is present in the smallest percent by mass?

Give the correct name for FePO4.

What is the energy of a photon with a wavelength of 245 nm? 

Of the substances below, which will hydrogen bond with water?  

What amount of Al2O3 is produced from the reaction of 3.0 mol Al with 2.0 mol Fe2O3? 2Al + Fe2O3 → Al2O3 + 2Fe