Chapter 2: Problem 48
Two substances have the same molecular and empirical formulas. Does this mean that they must be the same compound?
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Chapter 2: Problem 48
Two substances have the same molecular and empirical formulas. Does this mean that they must be the same compound?
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How many hydrogen atoms are in each of the following: (a) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH},(\mathbf{b}) \mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COO}\right)_{2},(\mathbf{c})\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} ?\)
(a) Which two of the following are isotopes of the same element: \(\frac{31}{16} \mathrm{X}, \frac{31}{15} \mathrm{X}, \frac{32}{16} \mathrm{X}\) ? (b) What is the identity of the element whose isotopes you have selected?
For each of the following elements, write its chemical symbol, locate it in the periodic table, give its atomic number, and indicate whether it is a metal, metalloid, or nonmetal: (a) chromium, (b) helium, (c) phosphorus, (d) zinc, (e) magnesium, (f) bromine, (g) arsenic.
The elements of group 4 \(\mathrm{A}\) show an interesting change in properties moving down the group. Give the name and chemical symbol of each element in the group and label it as a nonmetal, metalloid, or metal.
Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (a) The nucleus has most of the mass and comprises most of the volume of an atom. (b) Every atom of a given element has the same number of protons.(c) The number of electrons in an atom equals the number of neutrons in the atom. (d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force.
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