Problem 4
Give the charge each atom takes when it forms an ion. If more than one charge is possible, list both. a) \(\mathrm{Ca}\) b) I c) \(\mathrm{Fe}\)
Problem 4
Name each acid. a) \(\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq})\) b) \(\mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{aq})\) c) \(\mathrm{HCl}(\mathrm{aq})\)
Problem 4
How are atoms of the same element the same? How are atoms of the same element different?
Problem 4
What is the difference between \(\mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{H}_{2} \mathrm{O}_{2}\) (hydrogen peroxide)?
Problem 4
Estimate the mass, in whole numbers, of each isotope. a) phosphorus- 31 b) carbon-14 c) americium- 241
Problem 5
Give the charge each atom takes when it forms an ion. If more than one charge is possible, list both. a) \(\mathrm{Ag}\) b) \(\mathrm{Au}\) c) \(\mathrm{Br}\)
Problem 5
Determine the atomic mass of each element, given the isotopic composition. a) lithium, which is \(92.4 \%\) lithium- 7 (mass \(7.016 \mathrm{u}\) ) and \(7.60 \%\) lithium- 6 (mass \(6.015 \mathrm{u}\) ) b) oxygen, which is \(99.76 \%\) oxygen- 16 (mass \(15.995 \mathrm{u}\) ), \(0.038 \%\) oxygen-17 (mass \(16.999 \mathrm{u}\) ), and \(0.205 \%\) oxygen \(-18(\operatorname{mass} 17.999 \mathrm{u})\)
Problem 5
Name an acid found in food.
Problem 5
Give complete atomic symbols for the three known isotopes of hydrogen.
Problem 6
In 1986 , when Halley's comet last passed the earth, astronomers detected the presence of \(\mathrm{S}_{2}\) in their telescopes. Why is sulfur not considered a diatomic element?
