CEM 141 MSU Exam 1 Questions & Answers 2024/2025

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 because? - ANSWERSA plant's leaves are green in the summer because they contain chlorophyll. Chlorophyll is a natural pigment that absorbs all wavelengths in the visible spectrum except green. How many naturally occurring elements exist? - ANSWERS91 What was Dalton's Atomic theory? (1808) - ANSWERS- Elements are composed of small particles called Atoms. - Atoms of a given element are different from atoms of other elements. -Chemical reactions happen when atoms are rearranged. - Compounds contain 2 or more elements. What was J.J. Thomson's experiment, and what did he discover? - ANSWERSUsing a Cathode Ray Tube, he noticed that particles emerged to the cathode disk, and moved to another, the anode. These particles could be deflected by electrical fields that would indicate that they would be negatively charged. They were also deflected by magnetic fields, which showed the particles carried the charge as the ray was bent. The most important observation was that the type of cathode used did not matter, as these