6.
calcium and its compounds, have properties typical of group 2 in the periodic table.
calcium carbonate, caco3, reacts with acids such as nitric acid.
a student neutralised 2.68 g of caco3 with 2.50 mol dm
nitric acid, hno3.
the equation for this reaction is shown below.
caco3(s) + 2hno3(aq) - ca(no3)2(aq) + co2(g) + h2o(1)
the student left the solution of calcium nitrate formed to crystallise. crystals of
hydrated calcium nitrate formed containing 30.50% of h2o, by mass.
calculate the formula of the hydrated calcium nitrate.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

What are the first three quantum numbers for the electrons located in subshell 2s?

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.