what is the approximate density of a block of wood that measures 2 cm on each side, and has a mass of 16 grams?

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

(1.6 × 10-19)(5.0 × 106) = c × 10d identify the missing numbers below to show the result of multiplying the numbers.