Calculate how many valence electrons are in H2CO, N2, Cl2?

If. 959 of heat is added to. 88g of water, how much will its temperature increase?

Oxides of virtually every element are known. bromine, for example, forms several oxides when treated with ozone. suppose you allow 1.250 g of bromine, br2, to react with ozone, o3, and obtain 1.876 g of brxoy.

You are handed a sample of an unknown silicate mineral. which two elements must it contain?

the pressure of 5.0 L of gas increases from 1.50atm to 1240 mmgh. what is the final volume of the gas, assuming no change in moles or temperature?

A substance is classified as either an element or a

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement a. the isotope at 42.0 amu is less abundant b. the element has 19 protons and 21 neutrons c.

Which of the following wave is most like visible light? a sound wave moving through the air a radio wave moving through space a water wave moving through a lake a sound wave moving through wood

What holds the atoms together in a covalent bond? the attraction between the shared electrons and protons in each nucleus a weak electron cloud the attraction of the opposing ions the crystal lattice structure

A container with the ability to expand and contract has its pressure changed from 5.0 atm to 7.5 atm at constant temperature. It the original volume was 4.0 L, what is the new volume?

What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?