How is light created

What distinguishes brownfields from other land being considered for development?

Which element has six valence electrons in each of its atoms in the ground state?

Which group of elements are considered to be in the same family? A. helium, neon and argon B. potassium, calcium and scandium C. manganese, iron and cobalt D. hydrogen and helium

Who first proposed that an atom might be the smallest form of matter, and why wasn't this proposition made into a theory by the scientific minds of the time?

The atomic mass of chlorine is 35.45. Is it possible for any single atom of chlorine to have a mass number of exactly 35.45? Explain

Solid lead IV oxide decomposes into solid lead and oxygen gas.

Ab2 has a molar solubility of 3.72*10-4 m. what is the value of the solubility product constant for ab2? express your answer numerically.

Thermal decomposition of sodium azide (NaN₃) into nitrogen gas and sodium metal is used to inflate car airbags. The reaction proceeds by the following chemical reaction. 2NaN₃ (s) ⟶3N₂ (g) + 2Na (s) How many grams of NaN₃ are need to inflate a 10.

Is salt water acidic, basic or neutral

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