Cem 141 msu - Study guides, Class notes & Summaries

CEM 141 MSU Exam 1 Quizzes & Ans!!

Yes because it can be tested and answered though observations and experiments - Consider the question: Is there an attractive force between a pencil and the earth? Is this a scientific question? [Yes or No] Because III. It can be tested and answered through observations and experiments IV. The answer is already known and we find it online V. There is no way to design an experiment to answer this question. Atoms are mostly empty space Atoms are in constant motion - Which of the following ...

CEM 141 MSU Exam 3 UPDATED Exam Questions and CORRECT Answers T/F: Covalent bonds are present only when atomic orbitals interact constructively. - Correct ANSWER- True. Binding in Diamond - Correct ANSWER- Each carbon forms 4 bonds to 4 identical carbons; tetrahedral; sp3 Valence Bond Theory - Correct ANSWER- The idea that covalent bonds are formed when orbitals of different atoms overlap. T/F: Electrons are localized in molecular orbital. - Correct ANSWER- False

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 - - 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 the numb...

Ionization Energy - Answer-energy required to remove an electron from an atom in the gas phase Left Side Electrons - Answer-have weaker attractions to remove electrons *easier to remove electrons from the left side of the table than the right side* Does it take MORE or LESS energy to remove an electron from Li than from Na? - Answer-MORE Why? Because as we move down a group, the orbitals become larger and weaker. While going across the effective nuclear charge increases. (holds onto the ele...

CEM 141 MSU Exam 1 Questions With 100% Correct Answers.

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 MSU Exam 3

CEM 141 MSU Exam 1 UPDATED Exam Questions and CORRECT Answers The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - Correct ANSWER- Claim, always include an explanation and reasoning to the claim. Scientific Model - Correct ANSWER- Models are used to make testable predictions How much is a picometer? - Correct ANSWER- 0.1 x 10^-12 meters Atomic Force Microscopy/ Scanning Tunneling Microscopy - Correct ANSWER- Microscopes that now allows us to view at...

The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - Claim, always include an explanation and reasoning to the claim. Scientific Model - Models are used to make testable predictions How much is a picometer? - 0.1 x 10^-12 meters Atomic Force Microscopy/ Scanning Tunneling Microscopy - Microscopes that now allows us to view atoms. Leaves are green in the summer because? - A plant's leaves are green in the summer because they contain chlorophyll. Chloro...