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In neutral water at pH 7 the concentrations of H3O+ and -OH are identical, both are 10-7 M. If hydrochloric acid is added to neutral water such that the pH decreases to 3.0, what is the concentration of -OH after addition of the acid? pH = -log10 [H3O+] Kw  = 1 × 10-14

What is the recommended number of foot contacts for an athlete with intermediate experience in plyometrics? 

Which of the following substances can be metabolized anaerobically?

When aqueous solutions of AgNO3 and KI are mixed, silver iodide precipitates. The balanced net ionic equation is ________.

When the following equation is balanced, the coefficient of HCl is __________.  

An automobile engine provides 800J of work to push the pistons and generates 2250J of heat that is carried away by the cooling system.  Calculate the change in internal energy of the engine. (5pts)

How many significant figures are in 4.500 × 104 m?

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

Which of the following is more important to train for sprinting performance?

Metals are important in many functions in the human body, such as the functioning of nerve cells, muscle cells, the brain and the heart, the transport of oxygen and so on. Which from the following list of metals is most likely to be found naturally in the human body? Osmium (Os),   Thallium (Tl),   Palladium (Pd),   Chromium (Cr),   Barium (Ba)