Concept explainers
Interpretation:
Using the given bond energy values check whether the hydrogen really a good fuel or not and also check the calculated value of hydrogen matches to the given equation or not.
Concept Introduction:
Energy of Combustion: The energy released in the form of heat when given substance undergoes combustion reaction.
A Fuel is a substance that releases energy when it gets burnt in presence of Oxygen. The phenomenon a substance getting burnt in presence of Oxygen is termed as combustion and it is exothermic process. The larger the amount of heat released per gram of a substance, greater the potential it has to be a fuel.
Exothermic reaction: Exothermic reactions are those in which evolution of heat takes place during any
Endothermic reaction: Endothermic reactions are those in which heat is absorbed during any chemical reaction. In such type of reactions, external energy is needed
Want to see the full answer?
Check out a sample textbook solutionChapter 7 Solutions
Chemistry In Context
- Write the Lewis structures and give the electron-region geometry, molecular geometry, and bond angles, and the hybridization of the central atom of these polyatomic ions and molecules. (a) BrF2+ (b) OCCl2 (c) CH3+ (d) SeCS (e) CH3arrow_forwardCreate the Lewis structure of CF4. NOTE: do only the step asked for in each part and then click Check–don't work ahead to solve the final structure.arrow_forwardBoth SO2 and CO2 have the same number of atoms, but one is polar and one is non polar. Draw the geometries, identify which is polar and which is nonpolar, and explain why they are different. Please provide only typed answer solution no handwritten solution needed allowedarrow_forward
- What is the best reason for the observation that carbon can form four bonds and not two as expected from its electron configuration? * a) Carbon is in main group 4 of the periodic table. b) Carbon has four valence electrons in the n = 2 energy level. c) An electron is transferred from the filled 2s orbital to an unoccupied 2p orbital. d) The energy gap between the n = 1 and n = 2 is large and no further electrons can, therefore, be promoted from lower energy levels to facilitate more bonds. e) All of the reasons given above explain the observationarrow_forwardWhat is one way that cars release carbon into the atmosphere? Group of answer choices a. ice b. combustion c. photosynthesis d. cellular respirationarrow_forward3. Carbon atoms will bond with each other to form a chain, often with the peripheral atoms being hydrogen. These compounds, hydrocarbons, are organic compounds composed only of carbon and hydrogen. However, when hydrogen atoms are substituted with other elements, such as fluorine, this changes the properties of the molecule. Methylfluoride (CH3F), a substituted hydrocarbon, is used in semiconductor processing. Figure 1 depicts an incorrect Lewis structure for CH3F. (QUestion shown in photo) Which reason best explains why this structure is incorrect? a) Hydrogen lacks an octet. b) Too few electrons are used. c) Carbon cannot exceed an octet. d) Fluorine atom has too many electrons.arrow_forward
- Identify if the statement is true or false. If false, explain why the statement is false. a. H for the formation of a bond is always a negative number. b. Because the presence of pi bonds does not influence the geometry of a molecule, the presence of pi bonds does not affect the value of the bond enthalpy between two atoms. c. A hot metal is placed in a calorimeter. The temperature of the water increases. The q value for the metal will be positive and the q value for the water will be negative.arrow_forward(A) Write the balanced chemical equation for the formation of butane (C4H10). How does the potential energy change between the reactants and products in this reaction? (B) draw a potential energy diagram for this chemical reaction. (C) what is the relationship between energy changes and the breakdown and/or formation of covalent bonds? Explain your ideas in at least two sentences and remember to use vocabulary terms.arrow_forwardWhich of the following atoms do NOT have 5 valence electrons? Select all that applyarrow_forward
- Rewrite the Equations and show work HSiCl3 +H2O −→H10 Si10 O15 + HClarrow_forwardExplain how the choices consumers make can help limit greenhouse gas emissions and therefore offset the effects of climate change.arrow_forward3. A. Draw and label an energy diagram for a slow endothermic reaction B. A weather balloon contains 222 L of helium gas at 20.8 °C and 754 mm Hg. What is the volume in liters of the balloon when it rises to an altitude where the pressure is 552 mm Hg and the temperature is -40.0 °C C. Draw two different Lewis structures for C2H4O2, connecting the atoms differently in your two structures. Label the shape of each carbon atom in both structures.arrow_forward
- Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry by OpenStax (2015-05-04)ChemistryISBN:9781938168390Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark BlaserPublisher:OpenStaxChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning