Amylase does not break down into four glucose molecules. Amylase acts on some sugar which is four times larger than glucose, stachyose for example and produces four glucose molecules. The amylase is a catalyst, so it remains unchanged by this reaction.
Looking at the other way, it takes three bonds to holds four glucose molecules together, and the formation of each bond results in the loss of one water molecule, so it take 3 molecules of water to break down whatever-sugar-it-is into four glucose molecules. Trending News.
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Answer Save. Roger the Mole Lv 7. Still have questions? Get your answers by asking now.Water is the common name for dihydrogen monoxide or H 2 O. The molecule is produced from numerous chemical reactions, including the synthesis reaction from its elements, hydrogen, and oxygen.
The balanced chemical equation for the reaction is:. In theory, it's easy to make water from hydrogen gas and oxygen gas. Mix the two gases together, add a spark or sufficient heat to provide the activation energy to start the reaction, and presto—instant water. Merely mixing the two gases at room temperature, however, won't do anything, like hydrogen and oxygen molecules in the air don't spontaneously form water.
The hydrogen cations and oxygen anions are then free to react with each other, which they do because of their electronegativity differences. When the chemical bonds re-form to make water, additional energy is released, which propagates the reaction. The net reaction is highly exothermicmeaning a reaction that is accompanied by the release of heat.
One common chemistry demonstration is to fill a small balloon with hydrogen and oxygen and to touch the balloon—from a distance and behind a safety shield—with a burning splint.
A safer variation is to fill a balloon with hydrogen gas and to ignite the balloon in the air. The limited oxygen in the air reacts to form water but in a more controlled reaction. Yet another easy demonstration is to bubble hydrogen into soapy water to form hydrogen gas bubbles. The bubbles float because they are lighter than air.
A long-handled lighter or burning splint at the end of a meter stick can be used to ignite them to form water. You can use hydrogen from a compressed gas tank or from any of several chemical reactions e. However you do the reaction, it's best to wear ear protection and maintain a safe distance from the reaction. Start small, so that you know what to expect. French chemist Antoine Laurent Lavoisier named hydrogen, Greek for "water-forming," based on its reaction with oxygen, another element Lavoisier named, meaning "acid-producer.
He devised an apparatus to form water from hydrogen and oxygen to observe the reaction. Essentially, his setup employed two bell jars—one for hydrogen and one for oxygen—that fed into a separate container. A sparking mechanism initiated the reaction, forming water.
You can construct an apparatus the same way as long as you are careful to control the flow rate of oxygen and hydrogen so that you don't try to form too much water at once.
You also should use a heat- and shock-resistant container. While other scientists of the time were familiar with the process of forming water from hydrogen and oxygen, Lavoisier discovered the role of oxygen in combustion.
His studies eventually disproved the phlogiston theory, which had proposed that a fire-like element called phlogiston was released from matter during combustion. Lavoisier showed that a gas must have mass for combustion to occur and that the mass was conserved following the reaction.Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen :.
Efficient and economical photochemical water splitting would be a technological breakthrough that could underpin a hydrogen economy.
No industrially practical version of water splitting with pure water has been demonstrated, but the two component reactions H 2 production and O 2 production are well known. The water splitting of seawater and other salt water is used industrially to make chlorinehowever, and the waste hydrogen collected comprises about five percent of the world's supply.
A version of water splitting occurs in photosynthesisbut hydrogen is not produced.Falconry hood makers
The reverse of water splitting is the basis of the hydrogen fuel cell. Electrolysis of water is the decomposition of water H 2 O into oxygen O 2 and hydrogen H 2 due to an electric current being passed through the water. In power to gas production schemes, the excess power or off peak power created by wind generators or solar arrays is used for load balancing of the energy grid by storing and later injecting the hydrogen into the natural gas grid.
Production of hydrogen from water is energy intensive. Potential electrical energy supplies include hydropower, wind turbines, or photovoltaic cells.
Usually, the electricity consumed is more valuable than the hydrogen produced so this method has not been widely used. Because some of the energy in HTE is supplied in the form of heat, less of the energy must be converted twice from heat to electricity, and then to chemical formand so the process is more efficient. A version of water splitting occurs in photosynthesisbut the electrons are shunted, not to protons, but to the electron transport chain in photosystem II. The electrons are used to convert carbon dioxide into sugars.
The oxidized photosystem I captures electrons from photosystem II through a series of steps involving agents like plastoquinone, cytochromes and plastocyanine.
The photosystem II then brings about water oxidation resulting in evolution of oxygen, the reaction being catalyzed by CaMn 4 O 5 clusters embedded in complex protein environment; the complex is known as oxygen evolving complex OEC. In biological hydrogen productionthe electrons produced by the photosystem are shunted not to a chemical synthesis apparatus but to hydrogenasesresulting in formation of H 2. This biohydrogen is produced in a bioreactor.
Using electricity produced by photovoltaic systems potentially offers the cleanest way to produce hydrogen, other than nuclear, wind, geothermal, and hydroelectric. Again, water is broken down into hydrogen and oxygen by electrolysis, but the electrical energy is obtained by a photoelectrochemical cell PEC process. The system is also named artificial photosynthesis.
The conversion of solar energy to hydrogen by means of water splitting process is one of the most interesting ways [ citation needed ] to achieve clean and renewable energy. This process can be more efficient if it is assisted by photocatalysts suspended directly in water rather than a photovoltaic or an electrolytic system, so that the reaction takes place in one step.
Nuclear radiation routinely breaks water bonds, in the Mponeng gold mineSouth Africaresearchers found in a naturally high radiation zonea community dominated by a new phylotype of Desulfotomaculumfeeding on primarily radiolytically produced H 2. An aluminum alloy powder invented by the U.
Army Research Laboratory in was shown to be capable of producing hydrogen gas upon contact with water or any liquid containing water due to its unique nanoscale galvanic microstructure. It reportedly generates hydrogen at percent of the theoretical yield without the need for any catalysts, chemicals, or externally supplied power.
In thermolysiswater molecules split into their atomic components hydrogen and oxygen. Other reaction products like H 2 O 2 or HO 2 remain minor. One side benefit of a nuclear reactor that produces both electricity and hydrogen is that it can shift production between the two. For instance, the plant might produce electricity during the day and hydrogen at night, matching its electrical generation profile to the daily variation in demand.
If the hydrogen can be produced economically, this scheme would compete favorably with existing grid energy storage schemes. What is more, there is sufficient hydrogen demand in the United States that all daily peak generation could be handled by such plants.
The hybrid thermoelectric Copper-chlorine cycle is a cogeneration system using the waste heat from nuclear reactors, specifically the CANDU supercritical water reactor. The high temperatures necessary to split water can be achieved through the use of concentrating solar power.
Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. How do you calculate how much energy is needed to break a water molecule into its constituent atoms?
I just want to know what is required to get hydrogen out of water. Any method thermal,electrolysis etc followed, this much of energy will be always required. Sign up to join this community. The best answers are voted up and rise to the top.
Home Questions Tags Users Unanswered. How much energy is needed to break a water molecule? Ask Question. Asked 6 years, 11 months ago. Active 3 years, 9 months ago. Viewed 25k times.
Properties of water
A Johan. A 1 1 gold badge 1 1 silver badge 5 5 bronze badges. Indicate what work you've done so far in trying to ascertain the answer. To get you started, you might find it useful to read up on bond energies, enthalpy of formation, and Hess's law. Aug 11 '13 at If you don't want to answer, that's ok, maybe someone else will.
I thought the whole idea of stackexchange is that you can ask questions you want to know about, and people help you out. Note that I'm not asking the solution, I want to learn how you do it. A Aug 11 '13 at I don't mean any offense, I simply think your question fits the template of a "homework" question. I won't edit the tags again, but, in my view, it would be very good if you did some research prior to asking.Alternative energy news, and information about renewable energy technologies.
Posted in Fuel Cells Hydrogen Fuel. Plants produce energy with the help of photosynthesis. One of the important steps of photosynthesis is splitting water into hydrogen and oxygen and release of energy in this process. Scientists are trying to duplicate this process in the laboratory for the production of energy i.Mitsubishi dashboard symbols
Hydrogen fuel is a clean and green alternative fuel. Now researchers are observing single oxygen atoms hopping on a metal oxide slab, glowing brighter here and dimmer there. This very process is helping chemists to understand how water splits into oxygen and hydrogen in a better way.
This process is increasing the understanding of the chemical reaction that had previously only been talked about. This reaction will assist us in future to generate hydrogen fuel from water or to clean contaminated water. The scientists are making an effort to determine the basics of how titanium dioxide splits water. This break down of water molecules is a crucial mystery which the scientists have to unravel. We need to be acquainted with the knowhow of splitting of water for many purposeful activities such as hydrogen production, breaking down pollutants, and in solar energy.
Researchers are utilizing a technique called scanning tunneling microscopy to observe the splitting of water into hydrogen and oxygen with the help of titanium dioxide. This scanning tunneling microscopy technique will assist the scientists in watching the chemical reaction. They are drawing a parallel from corn fields. Researchers are imagining the surface of a slab of titanium dioxide as corn field from which rows of oxygen atoms rise from a patch of titanium atoms.
The alternating oxygen and titanium rows look like stripes. Scientists can spot some atoms and molecules that rest on the surface as bright spots.
Scientists can only observe water molecules with one condition, if they drop the temperature dramatically. At ambient temperature, water moves too fast for the method to pick them up. They have taken a surface coated with a few oxygen adatoms, they added water — and the adatoms started to dance. From theory and previous work, we expected to see this along the row. They also bounced out of them and landed in others. How to explain this phenomenon?
Scientists developed an explanation. They are helped by invisible water molecules, some unseen enabler. So the team calculated how much energy it would take to move adatoms with the help of water molecules. They called this pair hydroxyls. They act as thieves, they steal atoms from other molecules and not sparing each other! The water molecule floats off, leaving behind an adatom.
Half the time, that adatom is one spot over — which makes the original appear to have moved.Water intoxication see also Dihydrogen monoxide parody.Properties of Water
Water H 2 O is a polar inorganic compound that is at room temperature a tasteless and odorless liquidwhich is nearly colorless apart from an inherent hint of blue. It is by far the most studied chemical compound and is described as the "universal solvent "   and the "solvent of life". Water molecules form hydrogen bonds with each other and are strongly polar. This polarity allows it to dissociate ions in salts and bond to other polar substances such as alcohols and acids, thus dissolving them.
Water is the chemical substance with chemical formula H 2 O ; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Large ice crystals, as in glaciersalso appear blue. Under standard conditionswater is primarily a liquid, unlike other analogous hydrides of the oxygen familywhich are generally gaseous. This unique property of water is due to hydrogen bonding. Within the Earth's atmosphere and surface, the liquid phase is the most common and is the form that is generally denoted by the word "water".Stock price prediction using r
The solid phase of water is known as ice and commonly takes the structure of hard, amalgamated crystalssuch as ice cubesor loosely accumulated granular crystals, like snow. Aside from common hexagonal crystalline iceother crystalline and amorphous phases of ice are known. The gaseous phase of water is known as water vapor or steam. Visible steam and clouds are formed from minute droplets of water suspended in the air. Water also forms a supercritical fluid. The critical temperature is K and the critical pressure is In nature this only rarely occurs in extremely hostile conditions.
A likely example of naturally occurring supercritical water is in the hottest parts of deep water hydrothermal ventsin which water is heated to the critical temperature by volcanic plumes and the critical pressure is caused by the weight of the ocean at the extreme depths where the vents are located.
This pressure is reached at a depth of about meters: much less than the mean depth of the ocean meters. Water has a very high specific heat capacity of 4. These two unusual properties allow water to moderate Earth's climate by buffering large fluctuations in temperature.
Most of the additional energy stored in the climate system since has accumulated in the oceans. The specific enthalpy of fusion more commonly known as latent heat of water is The only time ATP is spent during cellular respiration is during glycolysis, so in order to break down five glucose molecules you would need 10 ATP molecules.
Mrs Smith has nine children half of them are girls. Have you ever crashed a wedding or had your wedding crashed, if so what happened? How many water molecules are needed to break down an oligosaccharide with ten glucose units?
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Top Answer. Wiki User Related Questions. How many water molecules are needed to break down amylase into 4 glucose molecules?
Amylase is a catalyst enzime.Mirage window smoke 64 tick
Amylose is the polysaccharide. How many ATPs are needed to break down 5 glucose molecules? How many molecules of ATP are needed to break the bonds of a glucose molecule into pyruvate molecule? What must happen to glucose molecules before respiration begins? Why is it important to break down starch to glucose molecules? Trending Questions. Hottest Questions. Previously Viewed. Unanswered Questions.
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