Cem 141 msu exam 1 - Study guides, Class notes & Summaries

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? - Answer-Claim, always include an explanation and reasoning to the claim. Scientific Model - Answer-Models are used to make testable predictions How much is a picometer? - Answer-0.1 x 10^-12 meters Atomic Force Microscopy/ Scanning Tunneling Microscopy - Answer-Microscopes that now allows us to view atoms. Leaves are green in the summer because? - Answer-A plant's leaves are green in the summer becaus...

CEM 141 MSU Exam 2 UPDATED Exam Questions and CORRECT Answers Lights acts as what? - Correct ANSWER- Particle and wave. Wavelength - Correct ANSWER- The distance (m) of waves from peak to peak. Short: x-ray (red), long: infrared (blue) Short - higher energy Long - lower energy Frequency (V) - Correct ANSWER- The number of wavefronts per second. Highest: x-ray Velocity of Light - Correct ANSWER- C = 3.00 X 10^8

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 2 PASSED Exam Questions and 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 - - Correct 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...

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...

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...

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