Carbon Hydrogen Count
Carbon Hydrogen Count - Related Videos
06:06
Hydrogenation
0 Views •
2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the hydrogenation of chalcone as an example of an alkene hydrogenation reaction (Figure 1). In this experiment, palladium on carbon (Pd/C) will be used as a heterogeneous catalyst for the process. A balloon will be used to supply the hydrogen atmosphere. Figure 1: Diagram showing the hydrogenation of chalcone to 3-phenylpropiophenone.
10:19
Using a Hemacytometer to Count Cells
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2023
Many biomedical experiments require manipulation of a known quantity of cells, in order to achieve accurate, reproducible, and statistically-relevant data. Therefore, learning how to count cells is a particularly essential technique for any successful biomedical scientist. The most common way to count cells is by using a hemacytometer - an instrument that bears two laser-etched grids, which aid in the enumeration of an aliquot cells under a simple light microscope. This data can then be used to...
08:56
Catalytic Reactor: Hydrogenation of Ethylene
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA The hydrogenation of ethylene (C2H4) to ethane (C2H6) has often been studied as a model reduction reaction in characterizing new metal catalysts.1-2 While supported nickel is not the most active metal catalyst for this reaction, it is active enough that reaction can take place at < 200°C. The reaction typically involves adsorbed, dissociated hydrogen (H2) reacting...
05:47
Counting and Determining the Viability of Cultured Cells
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Cited by 19 •
2008
Determining the number of cells in culture is important in standardization of culture conditions and in performing accurate quantitation experiments. In this video, we demonstrate how cells are counted using a hemacytometer.
08:40
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Cited by 3 •
2021
Here, we present a protocol to synthesize Co nanoparticles supported on carbon nanotubes with Co- and N- dopants for hydrogen productions.
FAQs
Carbon’s typical four-bond valence provides the basis for assigning hydrogens that are not explicitly drawn. After identifying the bonds connected to each carbon, the remaining bonding capacity indicates how many hydrogen atoms are attached. This check helps reveal whether a proposed structural representation is consistent with the molecule’s expected composition.
Read the element symbols and their subscripts separately, then use each subscript as the number of atoms of that element. A missing subscript indicates the basic single-atom count for that symbol. Recording carbon and hydrogen totals independently prevents confusion when comparing formulas or checking whether a proposed structure matches its stated composition.
A similar or identical number of carbon atoms does not guarantee identical composition. Differences in bonding arrangements can change how many hydrogens are attached, so carbon and hydrogen counts together provide more structural information than carbon count alone. Comparing both values helps distinguish compounds and assess whether a proposed structure is plausible.
Begin by identifying the carbon atoms represented in the line-angle drawing, including the relevant endpoints and corners. Then inspect the bonds connected to each carbon and assign enough hydrogen atoms to satisfy carbon’s typical four-bond valence. Finally, total the carbons and hydrogens and compare those totals with any molecular formula provided.
The carbon and hydrogen totals supply essential composition data for broader molecular analysis. Together with the counts of other elements, they contribute to determining molecular mass. Their relationship also helps evaluate saturation, allowing chemists to compare formulas or structures and recognize composition changes that may reflect different bonding patterns.
Comparing counts before and after a reaction helps track whether the proposed products have the expected composition. A change in carbon or hydrogen content can support, challenge, or refine an assigned structure, especially when combined with the reaction’s structural representations. This bookkeeping provides a straightforward way to evaluate molecular changes during synthesis.