How long is the Mississippi river?

Element A has seven valence electrons. How does its reactivity compare to that of element B, which has four valence electrons?

Write a balanced chemical equation, including physical state symbols, for the decomposition of solid calcium carbonate (CaCO₃) into solid calcium oxide and gaseous carbon dioxide. Suppose 23.

Be sure to answer all parts. Consider the following balanced thermochemical equation for the decomposition of the mineral magne MgCO3 (s) → MgO (s) + CO2 (g) ΔHrxn = 117.

If the pH of a solution is 9, the solution is A. acidic, which turns phenolphthalein pink B. acidic, which turns phenolphthalein colorless C. basic, which turns phenolphthalein pink D. basic, which turns phenolphthalein colorless

Which statement best explains how isotopes can have different masses and still be the same element? A. The quantity of protons identifies the element but changes if the mass of the isotope differs from what is shown on the periodic table. B.

What volume of 0.480 m koh is needed to react completely with 15.8 ml of 0.150 m h2so4? assume the reaction goes to completion?

Which sample of water contains particles having the highest average kinetic energy?

Use the terms magnetic field and magnetic pole in a sentence

Which of the following statements about chemical formulas is FALSE? A) The subscripts represent the relative number each type of atom in the compound. B) The subscripts represent the relative mass of each type of atom in the compound.

The lowest possible concentration of free hydrogen ions is represented by a ph value of