Why leather gets hardered after tanning

A student observed a chemical reaction in which the mass of the products was measured to be less than the mass of the reactants. How can this be explained?

Molecules are packed closer together in the ground than they are in the air. will sound travel faster or slower in the ground than in air? explain

using information in titles of appendices b and c, calculate the minimum grams of propane, C3H8 (g), that must be combusted to provide the energy necessary to convert 5.50 kg of ice at - 20C to liquid water at 75C

Explain how you can convert from the number of representative particles of a substance to moles

How many grams are in 4.00 x 1023 particles of alcl3?

What is wosutah unsrcambled

How many moles of al2o3 are formed when 0.78 mol o2 reacts with aluminum?

The dissociation of a weak electrolyte is suppressed when

There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification? Choose all answers that are correct. A. Class B. Order C. Family D. Level

An experiment with high validity is