Physics, 08.03.2021 21:10 lalaokawami0912
A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
A The 20 protons in each atom of calcium B The density of calcium, which is 1.54 g/cm3
C The atomic mass of calcium, which is 40.078 amu D The 2 valence electrons in each atom of calcium
Answers: 1
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Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.
Answers: 1
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