A nonmetal element in the third row of the periodic table exists as two allotropes (two different physical forms of the same element). One allotrope exists as an extended network while the other exists as discrete molecules. In the lab, you gather the following evidence about two allotropes of this element: Physical Form of Element Melting Point Allotrope 1 Allotrope 2 Which allotrope do you predict likely exists as an extended network and why? 1. Allotrope 2 because strong covalent bonds within the molecule require a lot of energy to break when melting a substance from a solid to a liquid. 2. Allotrope 1 because small molecules require less energy due to the weaker interactions to overcome compared to breaking strong covalent bonds when an extended network melts (essentially disintegrating). 3. Allotrope 1 because its lower melting point suggests that it makes a good liquid. 4. The data is wrong as all allotropes of the same element must have the same properties. 5. It is impossible to tell from the given data whether the substance exists as an extended network or discrete molecules. 1 O 3 0 388 K 4 1687 K 2

A nonmetal element in the third row of the periodic table exists as two allotropes (two different physical forms of the same element). One allotrope exists as an extended network while the other exists as discrete molecules. In the lab, you gather the following evidence about two allotropes of this element: Physical Form of Element Melting Point Allotrope 1 Allotrope 2 Which allotrope do you predict likely exists as an extended network and why? 1. Allotrope 2 because strong covalent bonds within the molecule require a lot of energy to break when melting a substance from a solid to a liquid. 2. Allotrope 1 because small molecules require less energy due to the weaker interactions to overcome compared to breaking strong covalent bonds when an extended network melts (essentially disintegrating). 3. Allotrope 1 because its lower melting point suggests that it makes a good liquid. 4. The data is wrong as all allotropes of the same element must have the same properties. 5. It is impossible to tell from the given data whether the substance exists as an extended network or discrete molecules. 1 O 3 0 388 K 4 1687 K 2

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter20: The Representative Elements

Section: Chapter Questions

Problem 10RQ

See similar textbooks

Similar questions

a) What are the chemical properties of the element cobalt in battery technology? b)What are the physical properties of the element cobalt in battery technology ? c)Is the element cobalt a compound or a complex compound in battery technology? d) What is the structure of the element cobalt in battery technology? e) What is the allotropy of the element cobalt in battery technology? Please give correct answers, no dislike, please answer pleaseeeeee
In 1995, Mario Molina, Paul Crutzen, and F. SherwoodRowland shared the Nobel Prize in chemistry for their work onatmospheric chemistry. One of several reaction sequences pro-posed for the role of chlorine in the decomposition of strato-spheric ozone is (1) Cl(g) +O3(g)→ ClO(g) +O₂(g) (2) ClO(g) +ClO(g)→ Cl₂O₂(g) (3) Cl₂O₂→ (g)2Cl(g)+ O₂(g).Over the tropics, O atoms are more common in the stratosphere:(4) ClO(g) +O(g)→ Cl(g) +O₂(g).(a) Which, if any, of these are oxidation-reduction reactions?(b) Write an overall equation combining reactions 1–3
How does the ground temperature in sunlight with CO2 compare with ground temperature in sunlight without CO2?
The name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. Suppose you had 300.g of ordinary table sugar, which chemists call sucrose, and which has the chemical formula C12H22O11 . Calculate the maximum mass of water you could theoretically extract. Be sure your answer has a unit symbol, and round it to the correct number of significant digits.
Explain the Jahn-Teller effect and provide an example. (Inorganic Chemistry)
1. Calculate the heat evolved when 13.56g of oxygen gas (O2) is used to burn white phosphorus at standard temperature and pressure according to the equation: P4(s) + 5O2(g) → P4O10(s), ΔH = -3013 kJ/mol2. Calculate the ΔH for the reaction: B2H6(g) + 6Cl2(g) → 2BCl3(g) + 6HCl(g)The following are given:a. BCl3(g) + 3H2O(l) → H3BO3(g) + 3HCl(g) ΔH = -112.5 kJb. B2H6(g) + 6H2O(l) → 2H3BO3(g) + 6H2(g) ΔH = -493.4 kJc. 1/2H2(g) + 1/2Cl2(g) → HCl(g) ΔH = -92.3 kJ
Tungsten is usually produced by the reduction of WO3 with hydrogen: WO3(s)+3H2(g)W(s)+3H2O(g) Consider the following data: WO3(s) H2O(g) Hf(kJ/mol) 839.9 241.8 Gf(kJ/mol) 7631 228.6 a It K 1 or 1 at 25C? Explain your answer. b What is the value of S at 25C? c What is the temperature at which G equals zero for this reaction at 1 atm pressure? d What is the driving force of this reaction?
When boron hydrides burn in air, the reactions are very exothermic (a) Write a balanced equation for the combustion of B5H9(g) in air to give B2O3(s) and H2O(g). (b) Calculate the enthalpy of combustion for B5H9(g) (fH = 73.2 kJ/mol), and compare it with the enthalpy of combustion of B2H6 (2038 kJ/mol). (The enthalpy of formation of B2O3(s) is 1271.9 kJ/mol.) (c) Compare the enthalpy of combustion of C2H6(g) with that of B2H6(g). Which transfers more energy as heat per gram?