U is the internal energy, which is the amount of energy a system holds in both kinetic and potential energy. H is the enthalpy, which is the amount of heat released or absorbed by a system at constant pressure. Thus, U is the total energy held by a system while H is specifically the energy that is transferred to/from a system in the form of heat.
What is the difference between H+ and H2?
The H+ hydrogen ion is the basis of the pH scale that runs from 0 to 14. This scale is measuring the proton or acid concentration of any liquid. The molecular form of hydrogen is more common. H2 is a gas which forms when two hydrogen atoms H+ bond together and become a hydrogen molecule.
What is the difference between H and H+ hydride ion?
The H + hydrogen ion is the basis of the pH scale. Hydride is a hydrogen atom which has an extra electron. This means that it is a negatively charged ion, or anion. That is why Hydride ion (H-) has the minus sign distinguishing it from a regular Hydrogen atom (H).
What is the relationship between H+ and pH?
More H + = more acidic. Less H + = more alkaline. Because H+ immediately associates with H 2 O to form H 3 O + (Hydronium), pH can also be said to be a measurement of the concentration of H 3 O + in a solution. The pH scale is logarithmic.
Why does the H+ ion not exist on its own?
The H + ion is a lone proton with a powerful charge. It does not exist on its own in an aqueous solution because it is immediately attracted to the unshared electrons in the oxygen atom of H 2 O.
What is the difference of H and H?
H2 is molecular hydrogen, which is mostly gaseous and extremely flammable. It is a molecule consisting two hydrogen atoms. Whereas H is hydrogen, neutral and an atom.
What is the difference between H 2H and H2?
H is one atom of hydrogen . H2 is two atoms of hydrogen that is one molecule of hydrogen. 2H is two molecules of hydrogen.
What do H and H+ represent?
hydrogen ion, strictly, the nucleus of a hydrogen atom separated from its accompanying electron. The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton. The isolated hydrogen ion, represented by the symbol H+, is therefore customarily used to represent a proton.
Is hydrogen H2 or H?
Hydrogen, H, is the lightest element with the atomic number 1. It is a colorless, odorless, tasteless, and highly flammable gas with the molecular formula H2.
What does H2 and 2H means?
H2 is Molecular hydrogen. It is a molecule of hydrogen that consists of two hydrogen atoms bonded together by one single bond (also known as a sigma bond). A subscript also denotes how many of a particular atom is in a molecule, thus H2 has two hydrogens. 2H, on the other hand, denotes two moles of elemental hydrogen.
Which is dark H or 2H?
The more H's, the harder a pencil is. This means that a 4H pencil is harder than a 2H and therefore also lighter. The 9H is typically the hardest and lightest graphite pencil available. An HB pencil falls in the middle of the scale.
What is the difference between H+ and H?
H+ = Proton The H+ hydrogen ion is the basis of the pH scale. Hydride is a hydrogen atom which has an extra electron. This means that it is a negatively charged ion, or anion. That is why Hydride ion (H-) has the minus sign distinguishing it from a regular Hydrogen atom (H).
What is the difference between hydrogen ions and molecular hydrogen?
The key difference between hydrogen atom and hydrogen ion is that the hydrogen atom is neutral whereas hydrogen ion carries a charge.
What is H in chemistry?
hydrogen (H), a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements.
Why is hydrogen H2 and not H?
In other words, two hydrogen atoms (H) are covalently bonded (a type of chemical bond) together as H-H. Because there are two hydrogen atoms, we call this diatomic hydrogen, di meaning two. Because the hydrogen atoms are covalently bonded together they form a molecule; so H2 is also referred to as molecular hydrogen.
Why can hydrogen form both H+ and H ions?
Hydrogen forms both H+ ion and H- ion. Explain. Hydrogen can easily lose the only electron present in the valence shell (1s1) and can exist as H+ ion. It can also take up one electron from outside to attain a stable configuration and therefore it exists as H-.
Which is more stable H+ or H?
H is more stable because H+ has charge..and its is replaceable...
Atomic hydrogen is number 1 on the Periodic Table of Elements. It consists of a single proton and is an oxidant or acid
However an atom of hydrogen rarely exists on its own because its unpaired proton eagerly seeks to join up with an electron stealing life-force energy from the body.
The pH scale
The pH scale is logarithmic. Increasing by 1 on the pH scale results in a 10 times decrease in the proton ion concentration and increasing by 3 on the pH scale results in a 1,000 times decrease in the proton ion concentration.
Foods are Either Proton Donors and Electron Acceptors or Electron Donors and Proton Acceptors!
The foods and liquids you ingest (see pictures below) are either proton donors poisoning your body and making you sick or electron donors providing you with energy and base protection.
Some of the most acidic, proton donating foods, drinks and supplements are
1) Eggs 2) Pork 3) Chicken 4) Beef 5) Turkey 6) Vinegar 7) HCL found in all drugs and supplements 8) Enzymes 9) Alcohol 10) Cheese 11) Ice Cream 12) Black tea 13) Coffee 15) Corn 16) Peanuts 17) All fermented foods like soy sauce 18) All the "ose" like fructose, sucrose, maltose, lactose, etc 19) Carbonated water or sodas 20) Chocolate
Some of the most alkaline, electron donating foods, drinks and supplements are
1) Alkaline water at a pH of 9.5 with an electrical potential of -250 Mv.
H1 Chemistry Scheme of Assessment
After covering the H1 chemistry syllabus, you sit for two exam papers.
H2 Chemistry Scheme of Assessment
A-level H2 is broader than H1 because it has more topics that are more complex. Therefore, when you choose to take it, you will sit for four papers.
H3 Scheme of Assessment
A-Level H3 chemistry is not for the faint-hearted. It is taken by H2 students who want to have a deeper understanding of chemistry. This paper takes one year to complete, that is, in the second year at Junior college. Also, the syllabus is an extension of H2 chemistry.
What is H3 Chemistry?
What about H3 Chemistry. H3 Chemistry is only available to students who have scored good grades during their first year in JC. The purpose of the subject is to further develop the top 10-15% of students within the cohort. As such, it is not a subject that is pursued when you first enter JC.
What is the second H2 science subject?
The second H2 science subject can either be biology or physics. In addition, you should expect to undergo entrance interviews.
What is the most common combination of subjects taken at A level?
Statistically, the most common combination of subjects taken at ‘A’ levels is the PCME combination . PCME refers to the subjects of Physics, Chemistry, Mathematics and Economics. Many students aspiring to work in chemistry or related fields of science or engineering do tend to choose this combination of subjects.
What courses are required for H2 Chemistry?
3 courses under the NUS Faculty of Science have H2 Chemistry as a pre-requisite. These are Life Sciences, Pharmacy and Food Science & Technology. In all 3 cases, you must have a pass in H2 Chemistry, H2 Biology and either Mathematics or Physics.
What do you need to do well at H1 or H2?
To do well at either H1 or H2 levels, students will need to demonstrate: An understanding of the nature of scientific knowledge. Ability to apply science inquiry skills.
Is H3 a subject in JC?
As such, it is not a subject that is pursued when you first enter JC. Unlike H1 or H2 Chemistry, H3 Chemistry does not have a specified syllabus. Instead, students have a selection of different programmes to pick from. This includes either university undergrad modules or extended in-depth research.
Is there lab work in H1?
However, the depth of content in H1 for these topics is noticeably less. It should also be noted that there is no lab work and thus no SPA exam for H1 students. In contrast, H2 students have frequent practical sessions throughout their school calendar year.
Is heat a differential?
Heat, on the other hand, is an inexact differential. Knowing the initial and final states of a process is not enough information to tell you the heat transfer. Instead, the heat transfer depends on the particular path taken between the states. For a simple example of why this is important, consider a heat engine.
Is heat a function of enthalpy?
Enthalpy and heat are entirely different things. Enthalpy is a function of state. If you know the state of a system, you know its enthalpy. If you know the starting and ending states of a process, you can find the enthalpy change. Heat, on the other hand, is an inexact differential.
Is a heat engine a cycle?
The process is a cycle, meaning the initial and final states are the same, so a cycle of a heat engine has zero enthalpy change. However, the entire point is that the heat engine converts heat into work, so the heat exchange during a cycle is not zero.
Difference between U and H?
Could someone please explain, in detail, the difference between U (internal energy) and H (enthalpy). Why does the equation for Cv use U while the equation for Cp use H?
Re: Difference between U and H?
U is the internal energy, which is the amount of energy a system holds in both kinetic and potential energy.
Re: Difference between U and H?
Also, don't forget that U= q+ w (and any other substitutions for q and w)! So, U is the overall internal energy due to heat and work, whereas q only reflects energy due to heat.
Difference between E and H?
What is the difference between E and H? Are they like related, the same?
Re: Difference between E and H?
H = E + PV, so they are related, however they are not the same. Energy, E, is more convienent to use in constant volume processes because at constant volume it is just the heat. Enthalpy, H, is more convienent to use in constant pressure processes since at constant pressure, H is just the heat.
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