Which of the following would be a qualitative observation? A The volume of the solution is 25 ml B The solution turned blue C The solution has a density of 1.52 g/ml D The solution has a pH of 8

What's the isotopic symbol for sodium

Compared to atoms of metals atoms of nonmetals generally have A lose electrons more readily B have higher electronegativities C have lower first ionization energies D conduct electricity more readily

Calculate the volume of compound Y needed to make a 350 pg/ml treatment solution in 2 ml of 1x PBS using a stock solution containing 50 ml of compound Y at 50 pg/ml. 14 l Not possible to make as described 140 pl 1.4 mi

How Do You Classify In Science

Which of the following is a true statement? Chemical changes are not ever useful. A chemical change changes only the size of the matter. A chemical change makes different matter from old matter. An ice cube melting is a chemical change.

A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? A. 1.25 billion years ago B. 2.5 billion years ago C. 3.75 billion years ago D.

Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?

Which is the best term to use when describing the energy of motion

The pka of hypochlorous acid is 7.530. a 54.0 ml solution of 0.114 m sodium hypochlorite (naocl) is titrated with 0.337 m hcl. calculate the ph of the solution