What is a valence electron

One type of water softener is precipitation softening, also known as ion-exchange. Based on the reactants used (Na2CO3 and CaCl2), what ions would remain in the softened water that would be consumed by the homeowners?

How is the thermal energy of a substance related to its physical state

2. What is the importance of meiosis and fertilization in sexual reproduction?

For a process at constant pressure, 24,800 calories of heat are released. This quantity of heat is equivalent to

Earth's surface area is 5.10 * 108 km2, and its crust has a mean thickness of 35 km and mean density of 2.8 g/cm3. The two most abundant elements in the crust are oxygen (4.55 * 105 g/t) and silicon (2.

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension