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Is sand in water a suspension? What is the process sand casting used for? What element has atomic number 16? What is the trend in electronegativity and ionization energy as you go down a row or across a period? What are the elements present in every organic compand is? How can one determine the number of valence electrons for an element on the periodic table? How can compounds be separated effectively? What elements has the lowest electronegativity cessium helium calcium fluorine? What is the word equation for the extraction of iron from the ore iron oxide? How do you neutralise sulfuric acid? A 250.0mL sample of oxygen gas was collected over water at a temperature of 25C and 750.0 nm Hg How many moles of oxygen gas were there in this sample if the vapor pressure of water at 25C is 23.8 mm? What causes water to change from a liquid to a gas? How many electrons will hydrogen gain or lose when it forms an ion? Why care must be taken to store hydrogen paraoxide in laboratery? The gases in a mixture have the following partial pressures at the same volume and temperature 10.13 kPa nitrogen 720 mm argon 1.25 ATM of helium 780 torr oxygen and 0.92 ATM of carbon dioxide What? Who found actinium? Why is water unique among the other compound? What types of chemicals required for the analysis of nanopaticles in animal cell by absorption spectroscopy? What is the process by which water vapor changes directly to a solid is called? Which pollutants are used by plants and dissolve in sea water?