What to Put Into Calculator for Ap Chem

Preparing for the AP Chemistry exam requires careful planning, especially regarding your calculator. This guide explains what to put into your calculator to maximize your score and avoid common mistakes.

Allowed Calculators for AP Chemistry

The College Board specifies that only certain calculators are permitted during the AP Chemistry exam. These are typically graphing calculators with specific features. Common approved models include:

Texas Instruments TI-84 Plus CE
Texas Instruments TI-83 Premium CE
Texas Instruments TI-89
Texas Instruments TI-Nspire CX

Before the exam, verify the most current list of approved calculators on the College Board's website. Using an unapproved calculator can result in disqualification.

What to Put in Your Calculator

Your calculator should contain essential formulas, constants, and unit conversions that you'll need frequently during the exam. Here's what to include:

Essential Formulas

Program the most commonly used formulas into your calculator's memory. This includes:

Ideal Gas Law (PV = nRT)
Molarity formula (M = moles/liters)
pH formula (pH = -log[H⁺])
Ksp expression
Gibbs Free Energy equation (ΔG = ΔH - TΔS)
Rate Law expressions

Physical Constants

Store key physical constants that appear frequently in problems:

Avogadro's number (6.022 × 10²³ mol^-1)
Gas constant (R = 0.0821 L·atm·K^-1·mol^-1)
Faraday's constant (96,485 C/mol)
Standard temperature and pressure (STP) values

Unit Conversions

Include common unit conversion factors for time, length, mass, and energy:

1 atm = 760 mmHg
1 L = 1000 mL
1 mol = 6.022 × 10²³ particles
1 calorie = 4.184 joules

Essential Formulas to Program

Programming these formulas into your calculator will save you time during the exam. Here are the most important ones:

Ideal Gas Law

PV = nRT

Where:

P = pressure (atm)
V = volume (L)
n = moles (mol)
R = gas constant (0.0821 L·atm·K^-1·mol^-1)
T = temperature (K)

Molarity

M = moles / liters

Where:

M = molarity (mol/L)
moles = amount of solute
liters = volume of solution

pH

pH = -log[H⁺]

Where:

H⁺ = hydrogen ion concentration (mol/L)

Programming these formulas into your calculator's memory will allow you to recall them quickly during the exam.

Unit Conversions to Include

Having these unit conversions programmed will help you solve problems more efficiently:

Conversion	Factor
1 atm to mmHg	760
1 L to mL	1000
1 mol to particles	6.022 × 10²³
1 calorie to joules	4.184
1 hour to seconds	3600

These conversions will be essential for solving a wide range of AP Chemistry problems.

Practical Tips for AP Chem Calculations

Organize Your Calculator

Use your calculator's memory functions to store formulas and constants in logical categories. For example:

Store gas law formulas in one category
Store thermodynamic formulas in another
Store unit conversions in a separate category

Double-Check Your Work

During the exam, take the time to verify your calculations. Common mistakes include:

Incorrect unit conversions
Misapplying formulas
Calculation errors

Practice with Past Exams

Familiarize yourself with the types of problems that appear on the AP Chemistry exam. Practice using your calculator to solve these problems under timed conditions.

Frequently Asked Questions

Can I use a scientific calculator for AP Chemistry?: No, only graphing calculators are permitted. Scientific calculators without graphing capabilities are not allowed.
Do I need to program all formulas into my calculator?: Program the most frequently used formulas and constants. You can also write them down on scratch paper during the exam.
What if I forget a formula during the exam?: If you're unsure of a formula, try to recall it from memory or use the process of elimination to determine which formula applies to the problem.
Can I use my calculator for all sections of the exam?: Yes, your calculator is permitted for both the multiple-choice and free-response sections of the exam.
What should I do if my calculator malfunctions during the exam?: If your calculator malfunctions, notify the proctor immediately. You may be allowed to use a backup calculator if one is available.