Ldfs - Study guides, Class notes & Summaries

Which reaction requires the most energy? A. N(g) → N+(g) + e - B. N+(g) → N2+(g) + e - C. F(g) → F+(g) + e - D. F+(g) → F2+(g) + e - - Answer-D. F+(g) → F2+(g) + e - Fluorine has a higher effective nuclear charge than Nitrogen - so it is harder to remove an electron (takes more energy because the electron is more strongly attracted by the nucleus). Effective nuclear charge is the same for F and F+ because the number of protons and core electrons are not changed. However, when t...

CEM 141-Exam 1 Latest Update Already Graded A Matter is made up of Atoms The the smallest distinguishable part of an element Atom Can change overtime according to the evidence available Theories ALL atoms/molecules attract to one another due to Electrostatic forces ________ lower potential energy of a system Attractions _____ raise potential energy of a system Repulsions Stable systems form where The attractive and repulsive forces are EQUAL or the potential energy is at a minimum The ...

BS 161 Exam Questions And Correct Answers 2024 Update What type of bond occurs between molecules? - Answer -Covalent bond Blank unwinds DNA - Answer -Helicase DNA polymerase can only add nucleotides to the 3' end of an blank strand - Answer -Existing What forces occur between molecules? - Answer -Ionic, hydrogen, hydrophobic clustering and london dispersion forces Covalent bonds involve To fill outer electron shells - Answer -Sharing of electrons. What is the goal of covalent ...

HOMEWORK EXAM 1 CHEM 142 QUESTIONS AND ANSWERS GRADED A Is there an attraction between two neutral helium atoms? Explain in detail why or why not. Be sure to include any evidence you have for your claim and how this supports your reasoning. Yes; 2 helium atoms can be attracted because the electrons in the electron cloud are freely moving. This leads to one of the atoms becoming an instantaneous dipole, this will then induce a dipole on the other atom. The opposite partial charges will a...

BS161 2024 Updated Exam What type of bond occurs between molecules? - ANSWER Covalent bond Blank unwinds DNA - ANSWER Helicase DNA polymerase can only add nucleotides to the 3' end of an blank strand - ANSWER Existing What forces occur between molecules? - ANSWER Ionic, hydrogen, hydrophobic clustering and london dispersion forces Covalent bonds involve To fill outer electron shells - ANSWER Sharing of electrons. What is the goal of covalent bonding? - ANSW...

CEM 141 Final Exam Questions and Answers Already Passed Why are alpha particles deflected by the nucleus? Because both the alpha particles and the nucleus are positively charged and so the alpha particle is repelled. Is this statement (Dalton's Theory) true or false and why? "All atoms of an element are identical and have the same mass and properties." False. Atoms of the same element can have different numbers of neutrons. What is the evidence that electrons are subatomic pa...

Why are alpha particles deflected by the nucleus? - Answer-Because both the alpha particles and the nucleus are positively charged and so the alpha particle is repelled. Is this statement (Dalton's Theory) true or false and why? "All atoms of an element are identical and have the same mass and properties." - Answer-False. Atoms of the same element can have different numbers of neutrons. What is the evidence that electrons are subatomic particles? - Answer-The nature of the electron is i...

CEM 141 Recitation Week 3 Questions and Answers Already Passed as atoms get closer together and their e- clouds overlap, why does PE rise? the electrostatic repulsion between e- means that the atoms are forced apart, since energy was used to "push" e- together (in the form of KE) this energy must be stored in the electrostatic field as PE what forces are present/respective strengths at potential minimum? the strength of the attractive forces = the strength of repulsive forces (al...

Chem 104 1st exam|Complete Questions with 100% Correct Answers What are hybrid orbitals? orbitals of equal energy produced by the combination of two or more orbitals on the same atom What are the types of hybrid orbitals SP- 2 regions of density SP^2- 3 regions of density(3sp^2s) SP^3- 4 regions (4 sp^3s) What are the 4 types of hydrocarbons alkanes, alkenes, alkynes, and aromatic hydrocarbons Alkane a hydrocarbon containing only single covalent bonds Alkene a hydrocarbon that contai...

Which of the following processes would you expect the entropy of the system to decrease? I. evaporating a liquid II. decreasing the temperature of a gas III. melting a solidII only The boiling point of pure methanol (CH3OH) is 338K and the boiling point of pure ethanol (CH3CH2OH) is 351K why is the boiling point of ethanol higher than methanol? a. because ethanol forms more hydrogen bonding interactions per molecule than methanol. b. because ethanol has a larger electron cloud and ther...