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Vlad [161]
3 years ago
7

how much energy is required to heat an iron nail with a mass of 25.5 grams from 65° until it becomes red hot at 720 degrees Cels

ius
Chemistry
1 answer:
Kay [80]3 years ago
3 0
2273.6 Joules that’s your answer
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Write the symbol for every chemical element that has atomic number greater than 55 and atomic mass less than 144.0 u
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You will need a periodic table to help you answer this problem. The atomic numbers are arrange from lowest to highest in the periodic table. You can locate element number 55 to be Cesium with an atomic weight of 132.905 amu. So, you start from element 56. The following elements are:

56     Barium       137.328 amu
57     Lanthanium   138.905 amu
58     Cerium       140.116 amu
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Neodymium is already greater than 144 amu. Therefore, these elements only include Barium, Lanthanium, Cerium and Praseodymium.</span>
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3 years ago
What does conserving mass mean in a chemical equation?
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Which of the following statements is true? Protons have a mass that contributes significantly to the mass of the atomic nucleus.
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The following statements from the paragraph are true. Protons have a mass that contributes significantly to the mass of the atomic nucleus. Neutrons have a mass that contributes significantly to the mass of the atomic nucleus. Electrons have a very low mass and are not found in the nucleus but instead are found in surrounding orbits.
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