The h-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times. For instance, an h-index of 17 means that the scientist has published at least 17 papers that have each been cited at least 17 times.
Full Answer
How do you calculate H?
Once you have m, the mass of your reactants, s, the specific heat of your product, and ∆T, the temperature change from your reaction, you are prepared to find the enthalpy of reaction. Simply plug your values into the formula ∆H = m x s x ∆T and multiply to solve. Your answer will be in the unit of energy Joules (J).
How do you find H+ from OH?
1:003:00Given OH- concentration | pH pOH [H+] calculations - Dr K - YouTubeYouTubeStart of suggested clipEnd of suggested clipUsing the relationship formula where pH plus Poh is 14 we plug in the value of Poh do theMoreUsing the relationship formula where pH plus Poh is 14 we plug in the value of Poh do the subtraction. And we get pH is three point five seven now that we have pH.
How do you find H when given pH?
0:082:44Calculate [H+] from pH - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt is easy when we are given a pH that is an integer such as 3.0. All we have to do is say hydroniumMoreIt is easy when we are given a pH that is an integer such as 3.0. All we have to do is say hydronium ion is equal to 10 to the negative 3 or 1 times 10 to the negative 3 molar.
What is pH =- log H+?
pH is defined by the following equation, pH = −log [H+] , where [H+] denotes the molar hydrogen ion concentration. Notice that we are required to take the common (base 10) logarithm of the hydrogen ion concentration in order to calculate pH.
How is H+ calculated?
[H+] = 10−pH, by exponentiating both sides with base 10 to "undo" the common logarithm. The hydrogen ion concentration of "Solution A" is, [H+] = 10−5.6 ≈ 0.0000025 = 2.51 × 10−6 M.
What is H+ in a reaction?
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.
How do you find H+ from pH and OH?
6:348:37Given pH & pOH, Solve for [H+] & [OH-] Practice Problems - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut i can use the inverse log. Function which is 10 to the in this case we'll call it the negativeMoreBut i can use the inverse log. Function which is 10 to the in this case we'll call it the negative ph equals the hydrogen ion concentration.
How do you find H+ from pH and volume?
Key ConceptsThe hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+] ... [H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pHMore items...
What is H in acid?
An acid is a substance or compound that releases hydrogen ions (H+) when in solution. In a strong acid, such as hydrochloric acid (HCl), all hydrogen ions (H+), and chloride ions (Cl-) dissociate (separate) when placed in water and these ions are no longer held together by ionic bonding.
Is H+ and pH the same?
Thus, we measure only [H+] and use it as the standard for pH. In this way, pH is determined by hydrogen-ion concentration. In the case of a neutral solution, [H+]=10-7 , which we call a pH of 7.
What is the H+ of pH 9?
Answer: If pH of solution is 9 , then its concentration is 10 ^-9 mol/l, or 0.000000001 mol of hydrogen ions.
What is the H+ of pH 3?
So, as you can see, the hydrogen ion concentration can be written as a positive power of 10. And since, by definition, [H+] = 1 x 10–pH, so if [H+] = 1 x 10-3, then pH = 3.
How do you find H+ from pH and OH?
6:348:37Given pH & pOH, Solve for [H+] & [OH-] Practice Problems - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut i can use the inverse log. Function which is 10 to the in this case we'll call it the negativeMoreBut i can use the inverse log. Function which is 10 to the in this case we'll call it the negative ph equals the hydrogen ion concentration.
Is H+ equal to OH?
In pure water, the hydrogen ion concentration, [H+], equals the hydroxide ion concentration, [OH-]. These concentrations can be calculated from the equation for the ionization of water.
Is H+ The same as OH?
Pure water (H20) will dissociate (come apart into H+ ions and OH- ions). This forms equal numbers of hydrogen ions (H+) and hydroxide ions (OH-). When the number of hydrogen ions (H+)equals the number of hydroxide ions (OH-), a solution is said to be neutral.
How are H+ and OH related to pH?
The more [H+] ions that are in solution, the more acidic the solution is. The more [OH-] ions in solution, the more basic the solution is. There is a special property of water that makes it act like an acid or base, depending on what is dissolved in it.
How Does the H-1B Process Work?
The H-1B employment-based visa allows a U.S. employer to hire foreign workers who are highly skilled in a job position in specialty occupations.
Establishing an Employer-Employee Relationship
To establish a legitimate employer/employee relationship for an H-1B visa:
Salary Issues
The employer must not pay the H-1B visa candidate any less than he would have paid a U.S. citizen employee.
The Labor Condition Application (LCA)
Employment in the U.S. under H-1B status requires Labor certification. Prospective petitioners follow same procedures when filing the Labor Certification Application with the U.S. Department of Labor (DOL) before the H-1B petition is sent to the USCIS. The application must be submitted online through the DOL iCert website on Form ETA-9035.
Filing the H-1B petition
H-1B employers cannot file a petition or a request for an extension for their candidate more than six months before the candidate’s projected start date (typically October 1).
Required Documents
Form G-28 (if the employer is represented by an immigration lawyer or an accredited representative).
H-1B Visa if you live outside the United States
Supporting documents will be required if the petitioner is located outside of the U.S. and therefore requires consular processing to have a visa stamped onto his passport so that he can enter the US.
How to tell if a reaction is endothermic or exothermic?
You can deduce whether a reaction is endothermic or exothermic by observation of the enthalpy change. A positive enthalpy change means that the reaction is endothermic, as heat is absorbed by the system from the environment. The other way round, the enthalpy change is negative, which means that the system has lost some part of thermal energy, and by this very fact, you may deduce that the reaction is exothermic.
What is the summation of E and P?
In a thermodynamic system, we may typically define enthalpy as the summation of E (internal energy) and the product of the V (volume) and P (pressure).
How to observe enthalpy change?
Change of enthalpy in a chemical reaction is generally observed by observing the difference of enthalpy between products and reactants. This change of enthalpy on both sides of the arrow of the chemical reaction is the enthalpy change.
Why is the pressure constant during a chemical reaction?
To observe the enthalpy change of a specific reaction, the pressure is generally kept constant to understand the results better. We may also say that to get a better understanding of change of enthalpy. We may refer to it as the overall flow of heat during a chemical reaction.
What is chemical reaction?
By Umair Iftikhar 13 Min Read. A chemical reaction is generally accompanied by an exchange of heat energy with the environment. This exchange may be either absorption of thermal energy from the atmosphere or emission of thermal energy into the atmosphere. This change of thermal energy in the thermodynamic system is known as change ...
Why is a chemical reaction considered endothermic?
A chemical reaction is said to be endothermic if there is absorption of thermal energy or heat from the environment. In all such reactions, there is an apparent or negligible amount of increase in the enthalpy.
What element has a specific heat?
Every element has a specific heat that you may use to figure out what the specific heat of your product is.
What is the most common cause of peptic ulcer disease?
H. pylori (Helicobacter pylori) is a bacteria that can cause an infection in the stomach or duodenum (first part of the small intestine). It’s the most common cause of peptic ulcer disease. H. pylori can also inflame and irritate the stomach lining ( gastritis ).
What test is used to determine if a child has a peptic ulcer?
If your healthcare provider suspects H. pylori bacteria may be the cause of a peptic ulcer, one or more of the following tests that may be ordered: A breath test: In this test, you or your child exhales into a bag before and after drinking a solution. The test measures the amount of carbon dioxide released in you or your child’s breath before ...
How to treat H pylori?
You can lower your risk of H. pylori infection if you: 1 Drink clean water and use clean water during food preparation. (Especially important if you live in areas of the world known to have a contaminated water supply.) 2 Wash your hands thoroughly (20 seconds) with soap and water before eating and after using the bathroom.
Where does H. pylori multiply?
H. pylori multiply in the mucus layer of the stomach lining and duodenum. The bacteria secrete an enzyme called urease that converts urea to ammonia. This ammonia protects the bacteria from stomach acid. As H. pylori multiply, it eats into stomach tissue, which leads to gastritis and/or peptic ulcer.
How to lower the risk of H. pylori?
You can lower your risk of H. pylori infection if you: Drink clean water and use clean water during food preparation. (Especially important if you live in areas of the world known to have a contaminated water supply.) Wash your hands thoroughly (20 seconds) with soap and water before eating and after using the bathroom.
How many people have H. pylori?
H. pylori bacteria is present in some 50% to 75% of the world’s population. It does not cause illness in most people. H. pylori infection mostly occurs in children. It’s more common in developing countries. In the U.S., H. pylori bacteria is found in about 5% of children under the age of 10.
How long does it take for a stomach ulcer to heal?
In addition, treatment may heal stomach ulcers. It can takes weeks to months for symptoms to completely go away.