H, N, Si, Al, Mg, O

a) identify the two elements which react together to form a molecule with the same shape as methane molecule.

b) Identify the two elements which form an ionic compound with a formula of type X2Y3, where X is a metal.

Which of the elements has the highest first ionization energy C Si Ge Sn Pb

Where does the energy go in an endothermic reaction?

What might happen if the earth exceeds its carrying capacity

What is the name for a wavelength that is formed from combined waves

A pure sample contains only nitrogen and oxygen atoms. If the sample is 30.4% nitrogen, by weight, what is the empirical formula of the molecule?

Calculate the pH of 0.65 M H2SO4 (sulfuric acid) solution? (Ka2: 1.1x10-2)

Ozone reacts completely with NO, producing NO2 and O2. A 13.0 L vessel is filled with 1.30 mol of NO and 1.30 mol of O3 at 401.0 K. Find the partial pressure of each product and the total pressure in the flask at the end of the reaction.

Which particles make up the nucleus of an atom? protons and electrons neutrons and electrons protons only protons and neutrons neutrons only

An egg is fried is that a physical or a chemical change

How many mono-; di -; and trichloro derivatives are possible for cyclopentane?