Cem 141 Study guides, Class notes & Summaries

CEM 141 Certification Exam Questions and CORRECT Answers Wavelength (λ) - Ans The top of one peak to another, distance in m or nm Amplitude - Ans the height of peaks (intensity) Frequency (v) - Ans the number of waves per second, Hz, 1/s, or s^1 Frequency vs Wavelength - Ans Energy of light increases as frequency increases and wavelength decreases

CEM 141 CHAPTER 1 LEARNING OBJECTIVES WITH COMPLETE SOLUTIONS Stable systems form when? The attractive forces and the repulsive forces are equal. Claim, evidence and reasoning for the existence of negatively charged particles in an atom. Claim: Electron's are negatively charged particles of an atom. Evidence: JJ's cathode ray. Electron's were ejected from the cathode, regardless of what the cathode was made of. Reasoning: Electrons must be negatively charged because they acceler...

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. - Answer-Yes because it can be tested and answered though observations and experiments Which of the following properties ascribed to atoms by the Greeks do we still...

mole - 6.022 x 10^23 things number of particles that allows us to convert from the molecular to the macroscopic level limiting reactant/reagent - amount of one of the reactants which limits how much product can be formed. smallest amount. percent yield - actual/theoretical x 100 electromagnetic radiation - wavelength - The distance between two corresponding parts of a wave. seconds/wave. 1/frequency. measured in m amplitude - Height of a wave frequency - waves/second. 1/wavelength. meas...

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

CEM 141 PASSED Exam Questions and CORRECT Answers Evidence that light is a wave - Ans Light is a wave because when light goes through 2 slits a diffraction pattern occurs. Reasoning that light is a wave - Ans the waves from each slit meet "in phase" or "out of phase" when the waves meet in phase constructive interference occurs and the wave intensity increases. this is seen by bright spots in the patterns. when the waves meet out of phase destructive interference occurs and the w...

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CEM 141 MSU Exam 1 Quizzes & Ans!!

CEM 141 Exam Guide Questions and CORRECT Answers What is gravitational force - Ans when a force is stronger, potential energy ________ - Ans decreases What causes atoms to approach for London Dispersion forces? - Ans attractive coulombic interaction when atoms get closer together, the potential energy ___________ when they get too close to each other - Ans increase

Which has a larger atomic radius? Mg or Ar? Why? A. Mg, because it is a metal. B. Mg, because its valence electrons are not as strongly attracted towards the nucleus as those in Ar. C. Ar, because it is a heavier element. D. Ar, because it has more electrons and they repel each other. - Answer B Out of Na+, Mg2+, Ne, and F- which has the smallest radius? A. Na+ B. Mg2+ C. Ne D. F- - Answer B When and where were the carbon and oxygen atoms in your body created? A. In plants as they wer...