A lead sinker has a mass of 5 g. Calculate the number of moles of lead the sinker contains. How many lead atoms are in the sinker? Calculate the mass of each of the following samples: mol magnesium 12 mol lithium × 1025 atoms of silica Molecules and compounds So far, we have only discussed moles, mass and molar mass in relation to ...
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One of the more common methods of mining for iron ore is open cast mining. Open cast mining is used when the iron ore is found near the surface. Once the ore has been removed, it needs to be crushed into fine particles before it can be processed further. As mentioned earlier, iron is .
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The only substances that can absorb this radiation are thick lead and concrete. Gamma decay occurs if the nucleus is at too high an energy level. Since gamma rays are part of the electromagnetic spectrum, they can be thought of as waves or particles.
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Only substance with high atomic masses (like lead) and high densities (like concrete or granite) are effective at absorbing gamma rays. Gamma decay occurs if the nucleus is at a very high an energy state.
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