Ions in a certain volume of 0.20 M NaCl (aq) are represented in the box on the left. In the box above on the right (but in your notebook really), draw a particle diagram that represents the ions in the same volume of 0.10 M CaCl2 (aq).

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

What was bohr’s contribution to the planetary model

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.