What is all of the living organisms on earth and the places they live in?

Describe how the atoms in Calcium Chloride obey the octet rule.

A scientist observes that after mixing a solid powder into water, the pH of the newly formed solution is 2.7. What can he infer from this observation? The solution contains an indicator that has a pH of 2.7. The solid powder contained hydrogen ions.

Is a pencil breacking a physical change?

What is the mass in grams of 1.204 x 1024 atoms of carbon?

How much of sliver metal will weight exactly 2500.0

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?