Purdue Chem 115 Exam 1 Questions and Answers 100% Pass

Purdue Chem 115 Exam 1 Questions and Answers 100% Pass What does the X represent Atomic Symbol What does the A represent Mass Number What does the Z represent Atomic number law of concervation of mass the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes horizontal on periodic table periods vertical on periodic table groups What are Ionic compounds made of metal and nonmetal What are covalent compounds made of nonmetal and nonmetal Describe ionic compounds melt/boil temps high describe covalent compounds melt/boil point low What are ionic compounds soluble and not soluble in soluble in water, not soluble in non-polar What are covalent compounds soluble and not soluble in soluble in non-polar, not soluble in water Beta charge negatively charged Gamma ray charge no charge Alpa charge positively charged Can you change mass number or atomic number mass number What causes isotopes different number of neutrons atomic mass unit amu what is an amu 1/12 the mass of a carbon-12 atom groups have similar chemical properties where are the metals located on the periodic table lower section, mid section, left side where are the nonmetals located on the periodic table right side, H where are the metalloids located on the periodic table staircase properties of metalloids have properties of metals and nonmetals group 1 name alkali metals group 2 name alkaline earth metals group 17 name Halogens group 18 name noble gases group 16 name Oxygen Family how to tell if it is ionic transfer of electrons how to tell if it is covalent sharing of electrons cation metal, loses, positive charge anion nonmetal, gains, negative charge monatomic ion an ion formed from a single atom Coulomb's Law attraction and repulsion is proportional to product of charges and inversely proportional to the distance between them as you go up the left side of the periodic table the attraction goes up and the size goes down as you go from left to right on the periodic table the attraction goes up and the charge goes up do metals lose or gain ions lose do non metals lose or gain ions gain atomic number will always be _____ than the atomic mass smaller What kind of compound is water polar covalent molecular mass average mass of a molecule molar mass mass per mole of a substance what is avogadro's number 6.022 x 10^23 what is avogadro's number equal to 1 mole mols x avocado = molecules atoms / avocado x mm = grams grams / a mass = moles grams / mm x avocado = atoms what make nuclear reactions different than chemical atoms change identity, massive energy reactions what decay penetrates the most gamma rays what decay penetrates the least alpha What does an alpha decay look like 4,2He what does a beta decay look like 0,-1E what does a gamma ray (y) look like not charge lost or gained, it is a photon What doe neutron decay look like 1,0N when balancing nuclear equations make sure the mass number and atomic number balance on both sides When n:p is 100:5 there are too many N, this causes the number of protons to increase through a beta decay, it is above the band of stability when n:p is 5:100 there are too many P, this causes the number of n to increase AND/OR for the number of p to decrease through electron capture and Beta+ emission When it is above the band of stability... it is too heavy and must lose weight by getting rid of H particle **What does beta decay do increase protons Protons and neutrons are held together by strong forces ratio of n:p determines stability all elements above bi are unstable isotopes show ____ properties identical how to find k 1/2t = 0.693 / k how to solve for half lives ln(no/nt) = kt what is the E in E=mc2 energy (j) what is E=mc2 Einstein's mass-energy equivalence equation fission fusion