Not exact matches
Cats give birth to kittens, not woodchucks,
oxygen bonds with
hydrogen to make water
and not alcohol.
Previously, researchers assumed that positively charged
hydrogen could only create
hydrogen bonds with negatively charged elements like
oxygen, fluorine
and nitrogen.
Like water, it is held together by the powerful
bonds between
hydrogen and oxygen atoms, so ethanol can not travel through most petroleum pipelines.
Complex organic molecules, consisting of carbon
bonded with other elements like
oxygen and hydrogen, are common in the Milky Way, but it was uncertain whether they would be produced in certain dwarf galaxies like the neighboring Large Magellanic Cloud.
At altitudes above 50 kilometers, ultraviolet light from the sun easily penetrates the Red Planet's thin atmosphere
and breaks down water's chemical
bonds between
hydrogen and oxygen.
They make good fuels because the energy stored in the
bonds between carbon
and hydrogen is abundant
and easy to release in combustion with
oxygen.
First, the chemists release the
hydrogen from its
bonds with carbon by mixing methane with
oxygen, throwing in a catalyst,
and turning up the heat.
«That's what his advance is pointing towards,» he says, «finding an alternative catalyst that will allow us to do
oxygen evolution (breaking the
bonds of water or H2O
and forming
oxygen) in concert with
hydrogen» on a grand scale.
Atoms of most elements, such as
hydrogen,
oxygen and carbon, form tight chemical
bonds by sharing electrons with their neighbours in order to give each atom a stable configuration of electrons.
Of the two types of atom,
oxygen has more pull on the electrons that they share to form the
bonds between them, so the
oxygen becomes slightly negatively charged
and the
hydrogens slightly positive.
The researchers discovered that these catalysts — copper in the form of a white salt
and the ligand as an oil — can oxidize C - H
bonds in a very efficient way in combination with
hydrogen peroxide, a reduced form of
oxygen that nature uses.
For example, in water (H2O) the sole
oxygen atom is bound to two
hydrogen atoms,
and the two
bonds constantly change in length.
Typically,
and logically, a positively charged
hydrogen atom
bonds to a negatively charged atom of
oxygen, nitrogen or fluorine.
As the water boiled away, the
hydrogen escaped into interstellar space while the
oxygen came back down
and bonded with carbon atoms.
This lack of
oxygen enables them to maintain their
hydrogen - carbon
bonds, a necessary ingredient for the production of oil
and gas.
Meyer, based at Grove City in Ohio, says that these electrically polarised conditions strain
and break the covalent chemical
bond between
hydrogen and oxygen, liberating the two gases.
He knew he needed to find metals that were deft at breaking the carbon -
hydrogen bonds that are at the heart of methane, ethane,
and propane, short hydrocarbons known as alkanes,
and then add in
oxygen atoms that would transform the alkanes into alcohols.
Water, for example, with one
oxygen and two
hydrogen atoms, can form two
hydrogen bonds per molecule.
Inside the AlloSphere, researchers such as Van de Walle use a joystick to maneuver through three - dimensional constellations of the
oxygen,
hydrogen and zinc atoms (linked by a complex lattice of chemical
bonds) that make up these conductors.
Aspirin, for example, contains just 21 atoms (nine carbons, eight
hydrogens and four
oxygens)
bonded together to form a particular shape.
The polymer
and the agent form
hydrogen bonds, weak electrostatic connections between polymer's
hydrogen and an agent's
oxygen atom.
For
hydrogen in Earth's early history to have arrived
and stayed put in great enough amounts to
bond with the
oxygen in Earth's atmosphere, it must have been attached to a «carrier» — another atom that bound it into a molecule.
Water is made of
hydrogen and oxygen,
bonded together into a molecule.
Because it has positive (
hydrogen)
and negative (
oxygen) charges, it sticks or
bonds to other water molecules.
Hydrogen peroxide is water with an extra
oxygen molecule
bonded that reacts with bacteria, viruses
and toxins.
But when their temperature is lowered
and they form a water molecule, the symmetry of the individual atoms is broken as they form a molecule with 105 degrees between the
hydrogen -
oxygen bonds.
The artificial leaf is essentially a silicon solar cell that has different catalytic materials
bonded to each side that allow it to split water molecules into
oxygen and hydrogen, the latter of which could be stored
and used as clean fuel.