Course Chapters

Calculator Fundamentals

Mathematics Review

• Numbers and their Properties
  
• Numbers in Science
  
• Ratios and Proportions
  
• Units, Dimensions and Conversions
  
• Percents
  
• Simple Statistics
  
• Logarithms
  

Basic Concepts

Advanced Concepts

Pre-test

Post-test

Redox Calculator

Kinetics Arrhenius Calculator

Thermodynamics Calculator

Nuclear Decay Calculator

Linear Least Squares Regression

Newton's Method Equation Solver

Compressibility Calculator

Units Conversion Calculator

Nomenclature Calculator

Texas Instruments Calculators

Casio Calculators

Sharp Calculators

Hewlett Packard Calculators

Solution Steps:

Don't let the technical terms get in the way! We are given a ratio:

Substituting in gives:

To finish this problem, we need to multiply these scientific notation numbers. Using the EE key:

The calculator prints:

So we'll state the final answer as:

Why only 3 digits? Look at the number of significant digits in the given measurements. The smallest is 3, so we can hope for no more than 3 digits in the answer.

Why put kilograms with this answer? In the last two problems, we were looking at whole atoms. Here we are looking at mass and charge, which are measurements and have units associated with them. Charge was given coulombs and the mass to charge ratio was given in kilograms per coulomb, and so we know mass : charge must have corresponding units kilogram : coulomb. In the next topic we review units and dimensions and address these issues.

Try another problem like this one.

Next Topic.