Chembio Lab Activity 3 PDF

Name: ________________________________ Date: __________________ Section: ____________________ Score: _________________ CHEMBIO184B Activity 3...

Name: ________________________________ Date: __________________ Section: ____________________ Score: _________________ CHEMBIO184B Activity 3 Laboratory Instrumentations Introduction Working safely with hazardous chemicals requires proper use of laboratory equipment. Maintenance and regular inspection of laboratory equipment are essential parts of this activity. Many of the accidents that occur in the laboratory can be attributed to improper use or maintenance of laboratory equipment. This laboratory activity discusses prudent practices for handling equipment used frequently in laboratories. Objectives To measure volume with a graduated cylinder To determine mass with a digital scale To measure temperature with a digital and alcohol thermometer Reading safety labels on chemicals Materials Graduated cylinder, Digital scale, beakers, thermometers, chemical bottles, stirring rod, pipet, foil, glass bead or marble, salt, other laboratory materials Methods Measuring the volume of liquid with a graduated cylinder 1. Fill the graduated cylinder with 100mL of water. 2. Notice that the fluid curves, this is called the meniscus. Measure at the bottom of the curve. 3. The volume of an irregular shaped object can be determined by dropping the object into the graduated cylinder. 4. Drop the glass bead or marble into the graduated cylinder. 5. Determine the volume of the bead by measuring the new volume and subtracting the initial volume. Measuring mass using digital scale 1. Examine the digital scale. Press the button marked unit and cycle through until you see “g” for grams. 2. Place a paper boat or foil on the scale. Record the mass of the paper boat or foil. 3. Press the “tare” button while the boat is still on the scale. The scale will now show a mass of 0. 4. Examine the beaker filled with salt. The marks measure volume in milliliters.  5. Carefully pour the salt from the beaker into the boat. The scale will now show the mass of only the salt in grams. 6. Return the salt to the beaker. Measuring temperature 1. Temperature can be measured with alcohol thermometers or digital thermometers. 2. Remove the alcohol container from its case. Note that the thermometer has both Celsius and Fahrenheit measurements. Most measurements in science uses the Celsius scale. 3. Place the alcohol thermometer in the ice water bath. Let it sit for 1 minute. Record the temperature. 4. Now use the digital thermometer and record the temperature of the ice water. Safety 1. Examine the labels on the chemicals. 2. Find the safety symbols and determine what precautions should be taken if working with the chemical.  Name: ________________________________ Activity number: _________ Group number: ____________________ Score: __________________ LABORATORY ANSWERSHEET A. Measuring the volume of liquid with a graduated cylinder New volume: ____________ Initial volume: ____________ Final volume: ____________ B. Measuring mass using digital scale Trial 1: _________ Trial 2: _________ Trial 3: _________ C. Measuring temperature Trial 1: _________ Trial 2: _________ Trial 3: _________ D. Safety LABELS DEFINITION 1. 2. 3. 4. 5. E. Laboratory materials Lab materials Drawing Uses Erlenmeyer flask Beaker Test tube Vial with cap Volumetric flask Graduated cylinder Pipet Buret Funnel Watch glass Crucible tongs Stirring rod Centrifuge Bunsen burner Dessicator Digital scale