Phosphorus can have a total of 4 oxidation states when it forms bonds with oxygen to become an oxyanion (+1, +3, +5, +7). The oxidation state of phosphorus increases by two with each additional oxygen atom in the formula unit. The two oxyanions of phosphorus shown in the table (PO33− and PO43−) correspond to the second lowest and second highest oxidation states of P. Consider the chemical formulas that would correspond to the oxyanions of phosphorus that are missing from the table of common polyatomic ions. What is the chemical formula of the oxyacid hypophosphorous acid?

Express your answer as a chemical formula.

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Temperature and kinetic energy are proportional. a) adirectly b) directly c) indirectly

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.