If 20.5 g of chlorine is reacted with 20.5 g of sodium, which reactant is in excess? 1. cl 2. neither is in excess. 3. na

Which statements describe kinetic and potential energy? Check all that apply. Energy can be stored in the position of an object. Energy is not present in a moving object. Energy can be stored in the position of the particles that make up a substance.

What do the numbers listed for an element on the periodic table represent? the smaller number is the mass, and the greater number is the atomic number. the smaller number is the number of protons, and the greater number is the mass.

The principle of conservationof mass states that in achemical reaction, the totalmass of the reactants is

I just pulled up to Sheetz and filled my car up with gas. Explain the transfer of energy that would occur once I start then drive my car--consider the type of energy that exists within the gas molecules, explain the transfer of form of energy as gas

Which of the following explains why atomic radius remains almost unchanged as you move through Period 2 from Group 14 to Group 18. The electrons are pairing up in the same orbitals so the don't move out in size of the cloud.

Which of the following is true concerning the noble gases? A. Their highest occupied s and p sublevels are filled. B. They belong to Group 8A. C. They are sometimes referred to as the inert gases. D. all of the above

Which of the following is responsible for passing albinism from a parent organism to its offspring?

Rubidium has two naturally occurring isotopes, rubidium - 85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium - 87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium

You are asked to analyze an aqueous solution (X) and determine what's in it. You pour some of your sample X into a test tube and add a few drops of an acid. No observable reaction occurs.

Which of the following items represents a chemical change? burning melting evaporation freezing