How many grams of Na2CO3 are contained in 0.400 L of 0.250M Na2CO3?

The electron configuration of an element is 1s^22s^22p^6. Describe what most likely happens when an atom of this element come near an atom having seven valence electrons.

Find the volume of box in cm^3 whose dimensions are 0.40meters long, 12.0 cm wide and 50.0mm deep

Which of the following is an example of an attempt to improve an environmental problem caused by chemicals

When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases: (1) an alpha particle (2) a beta particle (3) a neutron (4) a positron

H2 (g) + I2 (g) ⇌2HI (g) Initially, only H2 and I2 were present at concentrations of [H2]=3.65M and [I2]=2.70M. The equilibrium concentration of I2 is 0.0100 M. What is the equilibrium constant, Kc, for the reaction at this temperature?

Which usually has a higher temperature? A city or the areas around the city?

Toluene and pyridine form ideal solutions. Consider a solution of toluene and pyridine prepared at 25°C. Assuming that the mole fractions of toluene and pyridine in the vapor phase are equal, calculate the composition of the solution.

Formula for water what does the lack of a subscript after those O indicate

Why do the chemical properties cycle through each period? Every eighth element starting with hydrogen restarts the transition from metal to inert gas. Elements with atomic numbers which are multiples of eight start a new period.

Which statement correctly describes the Ka of a weak acid? The Ka is large, and the equilibrium favors products. The Ka is large, and the equilibrium favors reactants. The Ka is small, and the equilibrium favors products.