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In World War 2, people thought there was going to be a dairy shortage (which is a main source of calcium), so they started to put calcium in the white flour (which was, and still is, something consumed by many people) so that people always got enough calcium in their diet. It has been carried on ever since.
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What volume of hydrogen gas is produced at STP as sulfuric acid reacts with 120 g of solid metallic calcium in a single-replacement reaction?
Using the molar mass of calcium, convert 120 g to moles. Write the balanced chemical equation for the reaction, determining the mole ratio of hydrogen gas to calcium. Finally, apply Avogadro's Law to convert moles of hydrogen gas to volume at STP (22.4 L/mol).
What is wrong with this word equation calcium chloride plus magnesium sulfate barium chloride plus magnesium sulfate?
This word equation is incorrect because it does not follow the law of conservation of mass. The equation should be: calcium chloride plus magnesium sulfate yields barium sulfate plus magnesium chloride.
How may grams of calcium carbonate will be needed to form 4.29 liters of carbon dioxide?
To calculate the grams of calcium carbonate needed, you first need to determine the moles of carbon dioxide produced (using the ideal gas law). Then, since 1 mole of CO2 is produced for every mole of CaCO3 consumed, you can convert moles of CO2 to moles of CaCO3. Finally, use the molar mass of CaCO3 to convert moles to grams.
Is it legal to use white phosphorus as a weapon?
White phosphorus can be used legally for certain purposes such as creating smoke screens or for illumination in military operations. However, its use as a weapon to directly target humans is regulated under international humanitarian law. The use of white phosphorus in populated areas or against civilian targets is prohibited.
How is Hess's law used to measure enthalpy of desired reaction?
Hess's law is used to measure the enthalpy of a desired reaction by comparing it to a series of known reactions with known enthalpy values. By manipulating these known reactions and applying Hess's law, the overall enthalpy change for the desired reaction can be calculated. This allows for the determination of the enthalpy of the desired reaction indirectly, using information from related reactions.
