Textbook Question
Consider a sample of calcium carbonate in the form of a cubemeasuring 2.005 in. on each edge. If the sample has a densityof 2.71 g>cm3, how many oxygen atoms does it contain?
Ch.2 - Atoms, Molecules, and Ions
Chapter 2, Problem 109a,b,c
Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: (a) BrO4- (b) SeO32- (c) arsenate ion
Verified step by step guidance1
Identify the group in the periodic table where selenium (Se) is located. Selenium is in Group 16, also known as the chalcogens.
Recognize that elements in the same group often form similar oxyanions. For example, sulfur (S), which is also in Group 16, forms the oxyanion sulfate, \( \text{SO}_4^{2-} \).
Note that the given ion is \( \text{SeO}_3^{2-} \), which suggests a similar naming pattern to other oxyanions in the same group.
Consider the naming convention for oxyanions: the suffix '-ate' is typically used for the most common or typical oxyanion of an element. Therefore, \( \text{SeO}_3^{2-} \) would be named selenate, following the pattern of sulfate.
Conclude that the chemical name for \( \text{SeO}_3^{2-} \) is selenate, analogous to sulfate for sulfur.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
57sWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxyanions
Oxyanions are negatively charged ions that contain oxygen and another element. They often form when an element from the periodic table combines with oxygen, resulting in a polyatomic ion. The naming convention for oxyanions typically involves the number of oxygen atoms present, with suffixes like '-ate' for more oxygen and '-ite' for fewer. Understanding the structure and naming of oxyanions is crucial for predicting the formulas of related ions.
Recommended video:
Guided course
01:54
Polyatomic Oxyanions
Periodic Table Groups
Elements in the same group of the periodic table share similar chemical properties due to their similar valence electron configurations. This similarity extends to the types of ions they form, including oxyanions. For example, elements in Group 16, such as sulfur and selenium, often form oxyanions with similar structures and formulas, which helps in predicting the behavior of these elements in chemical reactions.
Recommended video:
Guided course
05:33Periodic Table: Group Names
Chemical Formula Representation
A chemical formula represents the composition of a compound or ion, indicating the types and numbers of atoms present. For oxyanions, the formula includes the central atom and the number of oxygen atoms, along with the overall charge of the ion. In the case of SeO3^2-, the formula indicates that selenium is bonded to three oxygen atoms and carries a -2 charge, which is essential for understanding its reactivity and interactions with other substances.
Recommended video:
Guided course
02:08Molecular Formula
Related Practice
Textbook Question
Cyclopropane is an interesting hydrocarbon. Instead of having three carbons in a row, the three carbons form a ring, as shown in this perspective drawing (see Figure 2.18 for a prior example of this kind of drawing):
Cyclopropane was at one time used as an anesthetic, but its use was discontinued, in part because it is highly flammable. (a) How does it differ from that of propane?
2
views
Textbook Question
Cyclopropane is an interesting hydrocarbon. Instead of having three carbons in a row, the three carbons form a ring, as shown in this perspective drawing (see Figure 2.18 for a prior example of this kind of drawing):
Cyclopropane was at one time used as an anesthetic, but its use was discontinued, in part because it is highly flammable. (b) The three carbon atoms are necessarily in a plane. What do the different wedges mean?
Textbook Question
Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: (d) hydrogen tellurate ion.
Textbook Question
Carbonic acid occurs in carbonated beverages. When allowed to react with lithium hydroxide, it produces lithium carbonate. Lithium carbonate is used to treat depression and bipolar disorder. Write chemical formula for carbonic acid, lithium hydroxide, and lithium carbonate.