Answer:
If the choices were coal, petroleum, and natural gas, I would say that petroleum has the greatest impact on the CO₂ levels in the atmosphere. I chose petroleum because of transportation, such as cars, trucks, planes, and more.
Answer:
Explanation:1 mole is equal to 1 moles CaCO3, or 100.0869 grams.
Answer:
Explanation:
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In this case, since the definition of by-mass percent is:
Whereas we know the percent as 11.9 % and the mass of the solution as 225g, so we compute the grams of solute as follows:
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A physical change is when the physical properties of an object change, whereas a chemical change is when the chemical properties of an object change. Iron rusting is a result of a chemical change, because the rust was not there before. Silver tarnishing is a chemical change for the same reason. Gasoline burning is also a chemical change, because gasoline changes chemically. Therefore, metal denting is a physical change, because the shape and position of an object is a physical property, and there are no new substances being formed, which are all indications of a physical change.