(a)
Interpretation:
The balanced chemical equation for the reaction of phosphorus with chlorine to form
Concept Introduction:
In a balanced equation the number of atoms of each element as a reactant is equal to the number of atoms of that element as a product.
Coefficient is a number placed before a formula in a chemical equation.
A balanced equation should be obeying the law of conservation of mass. Law of conservation of mass states that, the number of atoms remains constant throughout the reaction, simply it can be stated as follows, “during a
(b)
Interpretation:
The enthalpy change of the reaction of
Concept Introduction:
Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.
Enthalpy of formation:
(c)
Interpretation:
The bond dissociation enthalpy for
Concept Introduction:
Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.
Enthalpy of formation:
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Chapter 8 Solutions
Chemistry & Chemical Reactivity
- The reaction of quicklime, CaO, with water produces slaked lime, Ca(OH)2, which is widely used in the construction industry to make mortar and plaster. The reaction of quicklime and water is highly exothermic: CaO(s)+H2O(l)Ca(OH)2(s)H=350kJmol1 (a) What is the enthalpy of reaction per gram of quicklime that reacts?. (b) How much heat, in kilojoules, is associated with the production of 1 ton of slaked lime?arrow_forward(a) Which poisonous gas is evolved when white phosphorus is heated with Cone. NaOH solution? Write the chemical equation. (b) Write the formula of first noble gas compound prepared by N. Bartlett. What inspired N. Bartlett to prepare this compound? (c) Fluorine is a stronger oxidising agent than chlorine. Why? (d)Write one use of chlorine gas.arrow_forwardAnswer the questions in the table below about the shape of the borane (BH3) molecule. How many electron groups are around the central boron atom? Note: one "electron group" means one lone pair, one single bond, one double bond, or one triple bond. What phrase best describes the arrangement of these electron groups around the central boron atom? (You may need to use the scrollbar to see all the choices.) (choose one) X G <arrow_forward
- (A) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction. kJ/mol(B) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction. kJ/mol(C) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction kJ/molarrow_forwardUse heat of formation data from Appendix E to calculate ∆H ° for the following reaction:ClO2 (g) + O(g) → ClO(g) + O2(g)arrow_forwardIn the mountains, water in an open container will boil when(a) its critical temperature exceeds room temperature.(b) its vapor pressure equals atmospheric pressure.(c) its temperature is 100 °C.(d) enough energy is supplied to break covalent bonds.(e) none of these is correct.arrow_forward
- 4. The common oxidation number for an alkaline earth metal is +2. (a) Using the Born-Mayer equation (for determining the lattice enthalpy) and a Born-Haber cycle (draw it), show that CaCl is an exothermic compound (negative AHf). Make a reasonable prediction to estimate the ionic radius of Ca (explain your reasoning). The sublimation (atomization) enthalpy for Ca(s) is 178 kJ/mol. (b) Show that an explanation for the non-existence of CaCl can be found in the enthalpy change for the reaction below. The AHf for CaCl2(s) is -190.2 kcal/mol. 2 CaCl(s) → Ca(s) + CaCl2(s)arrow_forward(a) (i) (ii) (iii) With the aid of a simple schematic, explain what covalent bonding is and how it is formed. What are the differences between a covalent bond and an ionic bond? Which type of bond is found in crystalline silicon? At room temperature do you expect an ionic crystal to be a good electrical conductor or a good electrical insulator? Explain why.arrow_forwardCompounds such as NaBH4, Al(BH4)3, and LiAlH4 are complex hydrides used as reducing agents in many syntheses. (a) Give the oxidation state of each element in these compounds. (b) Write a Lewis structure for the polyatomic anion in NaBH4, and predict its shape.arrow_forward
- The elements sodium, aluminum, and chlorine are in the same period. (a) Which has the greatest electronegativity? (b) Which of the atoms is smallest? (c) Which is the largest possible oxidation state for each of these elements? (d) Will the oxide of each element in the highest oxidation state (write its formula) be acidic, basic, or amphoteric?arrow_forwardUse principles of atomic structure to answer each of the following: (1] (a) The radius of the Ca atom is 197 pm; the radius of the Ca2* ion is 99 pm. Account for the difference. (b) The lattice energy of CaO(s) is –3460 kJ/mol; the lattice energy of K20 is –2240 kJ/mol. Account for the difference. (c) Given these ionization values, explain the difference between Ca and K with regard to their first and second ionization energies. Element First lonization Energy (kJ/mol) Second lonization Energy (kJ/mol) K 419 3050 Ca 590 1140 (d) The first ionization energy of Mg is 738 kJ/mol and that of Al is 578 kJ/mol. Account for this difference.arrow_forwardUsing Lewis symbols and Lewis structures, diagram the formation of SiCl4 from Si and Cl atoms.arrow_forward
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