Atomic hydrogen reacting with

Then atomic hydrogen reacts with SiH4 ... 

The surface reduction proceeds probably by hydrogen spillover. H2 is dissociated onto the very small metal particules on the silicagel surface and atomic hydrogen reacts with oxygen of siloxane bridges producing traces of water and Si-H groups. 

Atomic hydrogen reacts with OF2 even at 77 K and 0.4 to 1.0 Torr to form HF, HgO, HgOg (and N2O4) [7]. Estimations from flow experiments gave k <10 ° cm mol" -s at room temperature. However, the reaction path could not be evaluated [18]. Vibrationally excited HF molecules, as shown by IR emission, are formed in a flow system [8] according to the reaction... 

Some of the atomic hydrogen reacts with chromium carbide precipitated at the grain boundaries. 

Hydrogen atoms also react -with a graphite surface at elevated temperatures to produce methane and acetylene (124,125). 

We see that each oxygen atom has residual bonding capacity. Each atom could, for example, react with a hydrogen atom to form hydrogen peroxide, as shown in electron dot representation (26). Each oxygen atom could react with a fluorine atom to form F2O2. In short, each oxygen atom is in need of another atom with mi electron in a half-filled valence orbital so that it can act as a divalent atom. 

Hydrogen atoms also react with the O—O bond of any peroxide, for example with hydrogen peroxide [59-61] ... 

Triphenylmethyl reacts with atomic hydrogen and with methyl free radicals when a solution of it is exposed to a gas stream containing the other radicals.82... 

In the reduction of a carbonyl group, there is an initial transfer of a hydride ion by an SN2 mechanism when the complex (1) is formed. Since it has still three more hydrogen atoms, it reacts with three more molecules of ketone to give the alkoxide (2) Hydrolysis of the latter gives secondary alcohol, along with aluminium and lithium hydroxides. 

A chemical reaction Is the result of competition It Is a race that Is won by the fastest runner. A collection of molecules tend to do, by and large, what Is easiest for them. An alkyl halide with p-hydrogen atoms when reacted with a base or a nucleophile has two competing routes substitution (Sj,jl and Sj,j2) and elimination. Which route will be taken up depends upon the nature of alkyl halide, strength and size of base/nucleophile and reaction conditions. Thus, a bulkier nucleophile will prefer to act as a base and abstracts a proton rather than approach a tetravalent carbon atom (steric reasons) and vice versa. 

Because HC(0)CFC12 has an abstractable hydrogen atom, it reacts with OH in the troposphere ... 

Manufacturing processes and equipment are similar to those employed for alcohol ethoxylate preparation. In the absence of steric hindrance, ethylene oxide reacts with both hydrogens of primary amines at relatively low temperatures (90—120°C) without added catalysts (105). When the nitrogen atom is hindered, as it is in the Triton RW products, only one of the amino hydrogens reacts with ethylene oxide. Once this reaction is complete, a basic catalyst is added and ethoxylation proceeds in the manner of the alcohol-based nonionics. In IV-alkyl-l,3-propanediamine, all three amino hydrogens are available for reaction with ethylene oxide. N-Alkyl-1,3-propanediamines are prepared from fatty monoamines and acrylonitrile, followed by reduction of the resulting 3-cyanoethylalkyl amine. 

Besides the oxygen atom reactions discussed earlier, we studied those involving I.2-C2H4CI2,66 NH3,66 and acetylene, cyclohexane, and benzene. At first attempts were made to find an O atom reaction that would be similar and at the same time essential for all substances. This is the ease, for example, for hydrogen atoms and hydroxyl. Hydrogen reacts with saturated hydrocarbons by abstraction of the H atom, and with unsaturated hydrocarbons by addition as well. Hydroxyl is believed to react with hydrocarbons by abstraction of the H atom and formation of water. 

From this equation, a chemist would be able to tell that two joined atoms of hydrogen react with two joined atoms of oxygen to produce water. 

Chemical reactions make new substances by taking the atoms that already exist in the reactants and rearranging them into different combinations to form the products—no new element can suddenly be created. For instance, in the earlier example, where hydrogen reacts with oxygen, carbon dioxide (C02) could never be a product of the reaction, because carbon is not one of the reactants. If an element is not present in the reactants, it will never appear in the products of a chemical reaction. 

Atomic oxygen reacts with saturated organic compounds and abstracts hydrogen 6 10). Unsaturated compounds add oxygen atoms to form epoxides,... 

In the first propagation step of the Wohl-Ziegler bromination, the bromine atom abstracts a hydrogen atom from the allylic position of the alkene and thereby initiates a substitution. This is not the only reaction mode conceivable under these conditions. As an alternative, the bromine atom could react with the C=C double bond and thereby start a radical addition to it (Figure 1.27). Such an addition is indeed observed when cyclohexene is reacted with a Br2/AIBN mixture. 

In the troposphere ozone is produced by photodissociation (equation 3) not of 02 but of N02, initiated with wavelengths <410 nm, followed by recombination (equation 2) with 02. In the upper troposphere and lower stratosphere the photolysis of ozone (equation 4) yields excited-state oxygen atoms which react with water to produce hydroxyl radicals (equation 5). These are crucial to the removal of organic compounds from the troposphere, since they readily abstract hydrogen atoms (equation 6) to yield organic radicals which subsequently undergo further oxidative degradation. 

In a chemical reaction the molecules (or the atoms) of the reaction partners react with each other and not their masses. Their number (amount) results from the mass of the respective substance according to its molecular mass. One mole (SI unit mole) of a chemically pure compound consists of NA = 6.022 x 1023 entities (molecules, atoms). The information about the amount of substance is obtained by dividing the mass of the chemically pure substance by its molecular mass. To put it even more precisely In the reaction between gaseous hydrogen and chlorine one mole of hydrogen reacts with one mole of chlorine according to the equation... 

Thus, generated nitrogen atoms can react with methane yielding the NH radicals, whereas reactions with carbene (CH2) and methyl radicals yield hydrogen cyanide. 

If you use the Woodward—Hoffmann rules, you need to note that the hydrogen atom must react with retention. The Is orbital is spherically symmetrical and has no node, so wherever you draw the dotted line from that orbital it always means retention. Choosing the components is easy—the diene is a n4 and the C-H bond a c2 component. 

In a similar fashion, a urea hydrogen atom can react with an additional isocyanate group to produce a biuret. 

---