Significant Figures Exercises. Expect These Chemistry Topics on Your AP Exam, Find out How to Write an Abstract for a Scientific Paper, How To Calculate the Osmotic Pressure of a Solution, Why Whole Milk Is White and Skim Milk Is Blue, See How to Calculate Enthalpy Change from a Sample Problem, Use Avogadro's Number To Calculate Mass of a Single Atom, Practice Using the Nernst Equation with This Chemistry Sample Problem, How to Calculate the Molarity of Ions in an Aqueous Solution, Review Heat of Fusion Calculations for Melting Ice Into Water, Practice Calculating Electrochemical Cell EMF With This Sample Problem. The decimal number 0.04013 is rounded down to 0.0401 when written to 3 significant figures. More Examples: But if the digit next to the rounding off digit is greater than 5, then we have to add 1 to the rounding off digit and exclude the other numbers on the right side. When more than one digit is left, rounding off should be done as a whole instead of one digit at a time. Not Just for Wine: What Is Decanting in Chemistry? What Type of Salt Is the Most Abundant in the Ocean? When you have completed every question that you desire, click the "MARK TEST" button after the last exercise. You will note that an answer given to three digits is based on input good to at least three digits, for example. The significant figures of a given number are those significant or important digits, which convey the meaning according to its accuracy. Donate or volunteer today! All the zeros that are on the right of the last non-zero digit, after the decimal point, are significant. Site Navigation. This means that everything after that place needs to go away. Do You Know How To Make a Sulfuric Acid Solution? For example, pi has an infinite number of significant figures but is often rounded to just three, i. E., 3. So I can only have three significant figures in my product. What Boiling Point Elevation Is and How It Works, Learn the Major Events in Chemistry History with This Timeline, Find the Wavelength of Light from Frequency, Here's What Happens When You Smoke Near an Oxygen Tank, Review This Sample Problem To Calculate Simplest Formula. Exact numbers can be considered as having an unlimited number of significant figures. Do You Understand the Metric System of Measurement and Units? … These substantial figures provide precision to the numbers. For example, 12.45 has four significant digits. Click ‘Start Quiz’ to begin! example: any measurement. Then I count to the right from there. Zeros trailing to the right of the rightmost non-zero digit may or may not be significant For example, the number 100 may have one sig. Learn The Chemistry Behind Salt Formation, Converting Millimeters to Centimeters Example Problem, The History of the Invention of Fireworks, The Difference Between Hard and Soft Water, Learn What Is Oxidized and What Is Reduced in Redox Reactions, Use the Clausius-Clapeyron Equation To Predict Vapor Pressure, Use Avogadro's Number to Find Number of Molecules in a Snowflake. What Really Happens If You Put Sugar in a Gas Tank? Practice Calculating Heat Capacity With an Example Problem, Difference Between Strong and Weak Electrolytes, Review Important Temperature Conversion Formulas. Trailing zeros are significant if they are at the end of a number and to the right of the decimal point. These digits carry a meaningful representation of numbers. For example, 5.20 g/mL has three significant figures, while 5.214 mL has four significant figures. Write 45.378212 correct to 3 significant digits/figures. The zeros are all between significant digits. So for this example, you would enter 15.23 * 3.600 into the calculator. All zeroes occurring in between two non zero digits are significant. Here Is the Recipe for a 0.5 M EDTA Solution, Calculate Number of Moles in a Balanced Chemical Equation, Practice Converting Milliliters To Liters With a Sample Problem, Test Yourself with These Unit Conversions Test Questions, Here's Why Dead Fish Float (and Why They Are Upside Down), Water Is a Much Weirder Molecule Than You Think, Determine Molarity From a Known Mass of Solute, Practice Using Dalton's Law With This Chemistry Sample Problem, See How To Determine Molecular Formula from Simplest Formula, Here's How to Find the Frequency of Light From the Wavelength, A Sample Problem on How to Calculate Boiling Point Elevation Temperature, Use the Half-Reaction Method to Balance a Redox Reaction. Have You Experienced the 9 Worst Lab Smells? Rules for rounding off numbers (1) If the digit to be dropped is greater than 5, the last retained digit is increased by one. Scientist vs Engineer - What's the Difference? 202 contains three significant figures ⎫ In these examples, the zeros 450.5 contains four significant figures ⎬ are part of a measurement.