PhySyCalc

価格	610円
ｼﾞｬﾝﾙ	ユーティリティ
サイズ	3.6MB
開発者	PhySy Ltd
順位	ｼﾞｬﾝﾙ別： --- 総合： ---
ﾘﾘｰｽ日	2013-08-24 16:00:00
評価	評価が取得できませんでした。
互換性	iOS 12.0以降が必要です。 iPhone、iPad および iPod touch 対応。

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 every fundamental physical constant. It even knows physical properties for elements and isotopes in the periodic table and can calculate formula weights. 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.
Not only does PhySyCalc save you time, it also saves you from mistakes. A conventional calculator will also give you a numerical answer, even if you accidentally multiplied instead of dividing. With PhySyCalc you’ll know right away that you entered the calculation wrong because the result will have the wrong units.
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.
Below are some sample inputs and outputs of progressive complexity.
Add 2 centimeters and 2 inches and give the answer in centimenters
Input: “2 cm + 2 in .. cm”
Output: “7.08 cm”
Add 2 centimeters and 2 inches and give the answer in inches
Input: “2 cm + 2 in .. in”
Output: “2.78740157480315 in”
Note: Swipe two fingers across the display to reduce the number of significant figures.
Multiply 3 teaspoons by 10 and give the answer in fluid ounces
Input: “3 tsp • 10 .. floz”
Output: “5 floz”
Calculate the rest mass energy of the electron in kiloelectronvolts
Input: “m_e•c_0^2 .. keV”
Output: “510.99894631902 keV”
Calculate the area in acres of a circle that has a radius of 1 mile. Recall Area = π•r^2
Input: “π•(1 mi)^2..ac”
Output: “2010.619298297468 ac”
Calculate the height in yards of a kite on 200 feet of string and flying at an angle of 40° with the ground. Recall right triangle relationship y = r•sin(angle).
Input: “200 ft • sin(40°) .. yd”
Output: “42.85250731243595 yd”
Calculate the volume in milliliters of 5 grams of carbon dioxide gas at 300 K and 989 mbar. Recall gas law: V = nRT/p.
Input: “(5 g/fw[CO2]•R•300 K)/(989 mbar)..mL”
Output: “2856.382301275785 mL”
PhySyCalc features include:
• Quantity units supported in all calculations
• Natural infix notation for entering calculations in full before evaluating
• Intuitive interface for appending units unto numbers so you can enter your calculation quickly
• Minimal buttons in portrait display for ease and speed of use
• Complex number support
• Press and hold delete button to clear entire display
• Left swipe display for unlimited undo makes it easy to find mistakes and correct them
• Right swipe display for redo
• Swipe up for keyboard
• Swipe down and navigate to the right unit for quantity (for iPhone)
• Swipe two fingers down on screen for full list of quantities and units
• Double-touch slide on display to reduce the number of significant figures
• Rotate to landscape for more units and scientific functions
• Press and hold any math function to apply to entire display
• Press and hold = button to retrieve value stored in memory
• Saves and recalls results to memory
• Universal app, supporting both iPhone and iPad displays
更新履歴
Minor Bug Fixes

‹ Lewis Dot Structures up Resonance Structures › These tutorials are sponsored by PhySy, the maker of PhySyCalc on iPhone, iPad, or Mac OS, and RMN on Mac OS. PhySyCalc is the only calculator app that let's you use units directly in calculations. Lewis Dot Structure Calculator This smart calculator is provided by wolfram alpha. Stoichiometry is hard to spell and even harder to. Stoichiometry is hard to spell and even harder to do.But with our free stoichiometry videos, worksheets, and reference materials, it's easy to review what you've learned in class and lock in the skills you'll need for more advanced chemistry topics.

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In 1916, ten years before the Schrodinger wave equation, G. N. Lewis suggested that a chemical bond involved sharing of electrons. He described what he called the cubical atom, because a cube has 8 corners, to represent the outer valence shell electrons which can be shared to create a bond. This was his octet rule.

Count the number of valence e^- each atom brings into the molecule.For ions, the charge must be taken into account.
How many valence electrons in BeCl₂?
How many valence electrons in NO₂^- and NO₂⁺?
Put electron pairs about each atom such that there are 8 electrons around each atom (octet rule), with the exception of H, which is only surrounded by 2 electrons. Sometimes it's necessary to form double and triple bonds. Only C, N, O, P and S (rarely Cl) will form multiple bonds.
Draw the Lewis dot structure for CF₄.
The number of valence electrons is 4 + 4 ( 7 ) = 32 electrons.
So, we obtain:
Draw the Lewis dot structure for CO.
The number of valence electrons is 4 + 6 = 10 electrons or 5 pairs. Since both C and O allow multiple bonds we can still follow the octet and write:
If there is not enough electrons to follow the octet rule, then the least electronegative atom is left short of electrons.
Draw the Lewis dot structure for BeF₂.
In BeF₂ number of valence e^- = 2+ 2(7) = 16 e^- or 8 pairs. Since neither Be or F form multiple bonds readily and Be is least electronegative we obtain:
If there are too many electrons to follow the octet rule, then the extra electrons are placed on the central atom.
Draw the Lewis dot structure for SF₄.
In SF₄ the number of valence electrons is 6 + 4 ( 7 ) = 34 electrons or 17 pairs. Placing the extra electrons on S we obtain:

How can the octet rule be violated in this last example? The octet rule arises because the s and p orbitals can take on up to 8 electrons. However, once we reach the third row of elements in the periodic table we also have d-orbitals, and these orbitals help take the extra electrons. Note that you still need to know how the atoms are connected in a polyatomic molecule before using the Lewis-Dot structure rules.

Physical Characteristics

Homework from Chemisty, The Central Science, 10th Ed.

Physical Change

8.45, 8.47, 8.49, 8.51, 8.53, 8.55, 8.57, 8.59, 8.61, 8.63