Chemistry and Physics

Scientific notation, constants, units, significant figures and formulas.

• Enter very big and very small numbersType numbers like 6.022 × 10²³ with the exponent key and read answers shown in scientific notation.
• Show answers in engineering notationDisplay results with powers of ten that are multiples of three, like 47 × 10³ for 47 kilo-units.
• Round an answer to significant figuresShow a result with the right number of significant figures, and see how to count them.
• Use a physical constant in a formulaEnter constants such as the speed of light correctly, store them for reuse, and see them in the Units lab.
• Convert between unitsChange miles per hour to metres per second (or any unit) by multiplying by conversion factors.
• Calculate molar massAdd up the atomic masses of every atom in a formula, like glucose C₆H₁₂O₆, to get grams per mole.
• Use the ideal gas lawFind the volume of a gas from PV = nRT, with moles, temperature and pressure.
• Solve a constant-acceleration motion problemUse s = ut + ½at² and v² = u² + 2as to find distance and final speed.
• Calculate pH and hydrogen-ion concentrationUse the log key for pH = -log[H⁺] and the 10ˣ key to go back from pH to concentration.
• Work out radioactive decay with half-lifeFind how much of a sample is left after some time, using N = N₀ × (1/2)^(t/T).
• Use Ohm's law and parallel resistorsFind the combined resistance of two resistors in parallel and then the current from V = IR.
• Calculate kinetic and potential energyFind kinetic energy with ½mv² and gravitational potential energy with mgh.