Bio 121 Final Exam Questions with Correct Answers

______ are substances that cannot be broken down to other substances by chemical means Correct Answer elements ______ energy is the energy that matter possesses because of its location or structure Correct Answer potential Nitrogen has an atomic number of 7 and an atomic mass of 14 daltons. Therefore, a Nitrogen atom must have: Correct Answer 7 protons Compared to 12C, the isotope 14C has: Correct Answer two more protons A cation has _______ one or more electron Correct Answer lost A water molecule contains ______ Correct Answer polar covalent bonds What is the approximate atomic mass of an atom with 8 neutrons, 8 protons, and 8 electrons? Correct Answer 16 daltons The reactivity of an atom arises from: Correct Answer The existence of unpaired electrons in the valence shell What results from the unequal sharing of electrons between atoms? Correct Answer polar covalent bond The ______ of a substance is defined as the amount of heat that must be absorbed for 1 g of that substance to increase its temperature by 1 degree C... Correct Answer specific heat The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called? Correct Answer hydrogen bond The pH of a particular substance is 4.0. What is the hydrogen ion concentration of the substance? Correct Answer 10^-4 M The above substance is _______ Correct Answer acidic How many molecules of glucose (C6H12O6 molecular mass= 180 Daltons) would be present in one mole of glucose? Correct Answer 6.02 x 10^23