Measuring Mass with a Quadruple-beam Balance 1. Adjust all masses on the balance to point to 0 g. 2. Place an object whose mass you want to find on the pan. 3. Adjust the mass on the back beam until you find the notch where the pointer dips below the balance mark. When the pointer dips below the balance mark, the mass on the beam is heavier than the object being weighed. 4.Bring the mass back one notch to the left. 5. Adjust the mass on the middle beams in the same manner as the back beam. 6. Adjust the mass on the front beam until the pointer lines up with the 0 mark.
READING LIQUID LEVELS • Why do the scales of graduated cylinders increase from bottom to top? • Graduated cylinders are designed to measure the desired volume of a liquid before pouring it into another container.
READING LIQUID LEVELS • Why do the scales of pipets increase from top to bottom? • Pipets are used to deliver or measure relatively small volumes of liquids. • Pipets are filled completely (until the bottom of the meniscus is at the 0 mark). • As the liquid is released from the pipet, the scale will allow you to measure the volume of the liquid delivered.
READING LIQUID LEVELS • When taking a reading, it is important to have the meniscus at eye level. • Hold a piece of white paper behind the graduated cylinder to help you see the meniscus of clear liquids clearly. • You can estimate the level of the meniscus between graduations. • The last digit in your measurement reading is therefore uncertain.
What is the liquid volume in each of the following graduated cylinders? 88.5 mL 13.2 mL 5.7 mL 44.2 mL
What is the liquid volume in each of the following? 5.6 mL 43.5 mL 39.5 mL
What is the liquid volume in each of the following? 7.60 mL 62.5 mL 43.5 mL 19.3 mL
Write the temperature reading for each of these thermometers. 25.0 0C 38.5 0C 4.0 0C 107.5 0C
Write the temperature reading for each of these thermometers. 41.10 0C 38.50 0C 36.00 0C 39.30 0C