Cem 1 - Study guides, Class notes & Summaries

change of state from solid -> liquid -> gas ________ energy - Answer-requires energy needed to phase change from solid --> liquid --> gas comes from: - Answer-the surroundings when phases change from solid --> liquid --> gas, interactions are _______ between molecules - Answerovercome change of state from gas --> liquid --> solid ______ energy - Answer-releases what happens to the energy from a phase change from gas --> liquid --> solid? - Answer-released to su...

CEM 141 MSU Exam 2 Questions and Answers Already Passed Lights acts as what? Particle and wave. Wavelength The distance (m) of waves from peak to peak. Short: x-ray (red), long: infrared (blue) Short - higher energy Long - lower energy Frequency (V) The number of wavefronts per second. Highest: x-ray Velocity of Light C = 3.00 X 10^8 = wavelength X frequency Amplitude The intensity, height of peaks of waves. Highest: blue light Energy of Wave (J) Increases as frequency i...

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...

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...

CEM 141 MSU Exam 1 Questions & Answers 2024/2025 The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - ANSWERSClaim, always include an explanation and reasoning to the claim. Scientific Model - ANSWERSModels are used to make testable predictions How much is a picometer? - ANSWERS0.1 x 10^-12 meters Atomic Force Microscopy/ Scanning Tunneling Microscopy - ANSWERSMicroscopes that now allows us to view atoms. Leaves are green in the summer becaus...

CEM 141 MSU Exam 1 Quizzes & Ans!!

CEM 141 PRACTICE EXAM QUESTIONS WITH VERIFIED ANSWERS 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. B Out of Na+, Mg2+, Ne, and F- which has the smallest radius? A. Na+ B. Mg2+ C. Ne D. F- B When and where were the carbon and oxygen at...

CEM 141 MSU Final Exam Questions and Answers Already Passed 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. Yes because it can be tested and answered though observations and experiments Which of the fol...

CEM 141 Chapter 1 Atoms Questions And Answers Rated A+ New Update Assured Satisfaction

CEM 141 MSU Exam 2 Questions and Answers Already Passed 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 pro...