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- PhySyCalc is the only calculator app that let's you use units directly in calculations. ‹ Ionic Bonds up Naming Covalent Compounds › These tutorials are sponsored by PhySy, the maker of PhySyCalc on iPhone, iPad, or Mac OS, and RMN on Mac OS. The Lewis dot structure for H2 molecule is shown below. Home; Equine Feed.
- As a teaching tool PhySyCalc offers students better insights in the concepts of physical quantity, dimensionality, and units. A student using PhySyCalc soon understands the connections between the base SI quantities and all the derived quantities. PhySyCalc's sole ambition is to be the world's best scientific 'pocket' calculator.
Lewis structure calculator Lewis structure calculator. Ponder the deep, existential mysteries of the universe. The story of creation is told by Dr. Day earned his Ph.D. At the University of California, San Diego for research in cosmology.
PhySyCalc is a calculator to help students in the physical sciences get the right answer faster. Have you ever been faced with a problem like this on an exam:
Www.physicalcompany.co.uk
What pressure in atmospheres does 0.078 moles of hydrogen exert on the walls of a 42.0 mL container at 25.0 °C?
If you're clever you already know that you need to use the ideal gas equation of state,
So, you identify the variables
n is the # of moles = 0.078 mol
T is the temperature in Kelvin = 273.15 K+25.0 K = 298.15 K
V is the volume = 42.0 mL
R is the gas constant = 8.314510 J/(K • mol)
Psycalc Online
and know that you can get the pressure using p = nRT/V. You pull out your calculator and plug in the numbers
0.078 * 8.314510 * 298.15 / 42.0 = 4.60380357635714
and write down 4.6 on the exam. Time to move on to the next problem, right? Not so fast: don't you need units on that number? Oh yeah, the question asked for the pressure in atmospheres. So, it's 4.6 atmospheres, right? Guess again! Maybe you should write out the calculation on paper with units:
0.078 mol * 8.314510 J/(K*mol) * 298.15 K / 42.0 mL
Rats! Now you have to do two calculations. Do the number calculation on the calculator (and get 4.6), and work out the final units calculation by hand on paper.
mol * J/(K • mol) * K / mL = J/(mol * mL)
OK, the answer is 4.6 J/(mol * mL). But wait, you need the answer in atmospheres! Gosh, this seems like a lot more work than it needs to be.
We agree!
With PhySyCalc you can enter the entire calulation with numbers and units and get the numerical answer with the correct units. Try it.
And there is the answer with the correct units.
Wait! You need the answer in atmospheres. No problem. Simply right-click (or control-click) the mouse and up pops a menu of all possible units.
Select 'atmospheres' and there is your answer.
To help you save even more time we've added some fundamental physical constants so you don't have to always keep looking them up. For example, instead of typing in the full gas constant with units you can use the symbol R. Additionally you can get the answer directly in the desired unit by appending two dots followed by the desired unit.
Fundamental constants:
| Constant | Shortcut |
| π | π |
| alpha particle mass | m_a |
| alpha particle mass energy | m_a•c_0^2 |
| atomic unit of charge density | l_p |
| Avogadro Constant | N_A |
| Planck Constant | h_P |
| Planck Constant/2 π | &hbar |
| Planck length | l_p |
| Planck time | t_p |
| Boltzmann Constant | k_B |
| Faraday Constant | &F |
| speed of light | c_0 |
| Acceleration due to gravity (at sea level) | g_0 |
| electron charge | q_e |
| nuclear magneton | µ_N |
| bohr magneton | µ_B |
| electron mass | m_e |
| proton mass | m_p |
| Gas Constant | R |
| neutron mass | m_n |
| electron magnetic dipole moment | µ_e |
| proton magnetic dipole moment | µ_p |
| neutron magnetic dipole moment | µ_n |
| electric constant | ε_0 |
| magnetic constant | µ_0 |
| conductance quantum | G_0 |
| magnetic quantum flux | Φ_0 |
| Fine Structure Constant | α |
| Rydberg Energy | Ry |
| Rydberg Constant | R_H |
| Stefan-Boltzmann Constant | σ |
| formula weight | fw[Chemical Formula] |
| atomic weight | aw[Element Symbol] |
| isotope weight | aw[Isotope Symbol] |
| isotope abundance | abundance[Isotope Symbol] |
| isotope nuclear spin | spin[Isotope Symbol] |
| isotope nuclear magnetic moment | µ_I[Isotope Symbol] |
| isotope nuclear electric quadrupole moment | Q_I[Isotope Symbol] |
| isotope nuclear gyromagnetic ratio | γ_I[Isotope Symbol] |
Notice, there is a shortcut for the atomic weight of any element or isotope in the periodic table using the element symbol. For example, you can get the atomic weight of carbon with aw[C], then calculate the grams of carbon in 3 moles by entering
If you need the mass of 16O isotope you can use
Physical.com
If you need the natural abundance of 10B use
If you have any other fundamental physical constants you'd like us to add drop us a line, we'd love to hear from you.
I've just been sent details of a couple of useful applicationsThis app displays a simple interactive table of properties for the NMR active isotopes. Properties displayed are element and isotope symbol, nuclear spin, natural abundance, gyromagnetic ratio, electric quadrupole moment, Larmor frequency, and dipolar coupling. Table can be sorted on any column. The magnetic field strength can be adjusted to determine the Larmor frequency. Dipolar couplings can be adjusted for different isotopes and internuclear distances. Additional filtering for even and odd atomic number isotopes, and for nuclear spin values.
RMN is a multi-dimensional signal processing application capable of handling uniformly sampled signals in an arbitrary number of dimensions. Provides a number of signal processing operations on real, complex, or multi-channel signals, such as Fourier Transform, apodization, data filling, interactive phase corrections, complex conjugate, 2D affine (translate, shear, rotate, scale) transformations. Signals can be added, subtracted, or multiplied. Two-dimensional signals can be displayed as intensity, contour, or stacked plots. RMN imports most NMR datasets from Bruker, Tecmag, JEOL, Spinsight, Varian/Agilent, and JCAMP (XYDATA only). Additionally, RMN imports image formats jpg and png, and audio format wav.
How is PhySyCalc different from other calculators? It allows you to include unit symbols in your calculations, obtaining the answer in the desired unit without those extra unit conversion steps. On top of this great simplification, PhySyCalc knows practically every fundamental physical constant. It even knows physical properties for elements and isotopes in the periodic table. This allows you to get numerical answers in the desired unit in a fraction of the time you'd spend on a conventional calculator. PhySyCalc is quick to learn and easy to use. Can't remember a unit symbol? PhySyCalc helps you find and append commonly used units onto a number. PhySyCalc uses a natural infix notation for calculations. This means you can enter and read through the entire expression in full before calculating the result, helping you quickly identify and fix any input errors.