An element has an atomic number of 22 what is the total number of valance electrons?

Whe. does water have its highest density

In a chemical reaction, the mass of the reactants always equals the mass of the products. True False

N2 (g) + 2O2 (g) + 2 NO2 (g) 3NO2 (g) + H2O (g) = 2HNO3 (aq) + NO (g) a. a car burns 4.00 x 10^2 g of N2. How many grams of HNO3 will be produced? b. what is the minimum amount of O2 needed in grams?

Harmful bacteria not remover by ealier steps in water purification are finally destroyed during what?

When 1.95 g of co (no3) 2 is dissolved in 0.350 l of 0.220 m koh, what are [ co2+], [ co (oh) 42-], and [ oh-] if kf of co (oh) 42 - = 5.00 * 109?

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?