Consider an atom of sodium with an atomic number of 11 and an atomic weight of 23. how many neutrons are in this atom

1. What's the difference between activity and concentration? 2. At what condition they become same? 3. Why do we need activity at all? 4. Why can't we simply use concentration?

Which of the following views of weather is an example of systems thinking

Which chemical reaction is associated with a fire? a. reduction b. precipitation c. oxidation d. none of the above?

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When writing the electron configuration for an element in the d block you have to remember to lower the energy level by 1. Question 2 options: True False

The dissolution of barium hydroxide in water is an exothermic process. Which of the following statements is correct? A) The enthalpy of solid barium hydroxide plus pure water is less than that of the solution, at the same temperature.

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If the pH of a wine is too high, say, 4.0 or above, the wine becomes unstable and has a flat taste. (a) A certain California red wine has a pH of 3.5, and a certain Italian white wine has a pH of 2.9.

Sodium hydroxide reacts with carbon dioxide as follows: which is the limiting reactant when 1.85 mol naoh and 1.