Procedure D – Measuring Mass Electronic Balance 1. Determine the combined mass of the beaker and water and record this mass to the nearest tenth of a gram in Data Table 4. Use the graduated cylinder to place exactly 40 mL of water in the 50 mL beaker. Repeat steps 1 through 6 using the rubber stopper and the coin. Remove the item and reset all pointers to zero. Record the mass of the beaker to the nearest tenth of a gram in Data Table 4. The mass of the object is equal to the sum of the readings on the three beams. Slide the 1g rider to the right until the pointer is at zero. Move the 100g rider to the right one notch at a time until the pointer drops below zero. Place the 50 mL beaker on the pan of the triple beam balance. Be sure that the riders on the balance are moved all the way to the left and that the pointer rests on zero. Procedure C – Measuring Mass Triple Beam Balance 1. Calculate the average volume the test tube can hold.ĭata Table 3 Volume Measurements Object Volume (mL) Water in Test Tube - Trial 1 Water in Test Tube - Trial 2 Water in Test Tube - Trial 3 Average Volume of Test Tube Record the volume of the water from the test tube to the nearest milliliter in Table 3. T measure the volume accurately, your eye must be at the same level as the bottom of the meniscus (see Figure 1). This curved surface is called a meniscus. The surface of the liquid will be slightly curved. Pour the water into the graduated cylinder. 2.įill the test tube to the top with water. Procedure B – Measuring the Volume of a Liquid 1. Convert the measurements from centimeters to millimeters. Record your measurements to the nearest millimeter in Table 2. Use a metric ruler to measure the length of a small test tube and the diameter of its mouth in centimeters (cm). Convert the measurements from centimeters (cm) to meters (m) and then to millimeters (mm). Record your measurements to the nearest tenth of a centimeter in Table 1. Use the meter stick to measure the length, width, and height of your laboratory table or desk in meters. Materials (per group) Meter stick Metric ruler Small test tube Rubber stopperĬoin Triple beam balance 50 mL beaker 100 mL graduated cylinder Name several aspects of everyday life that will change when our country converts to SI units. Why is it difficult to convert miles to yards or feet? What connections can you identify between the metric units for length and volume? Why is it easy to change from one unit to another in the SI system? Why do scientists and other people in most countries use the metric system for measurements? Pre-Lab Discussion Answer the following questions prior to performing this activity. In this activity, you will review SI units for measuring length, liquid volume, and mass. In the SI system it is easy to change one unit into another because all units are related to one another by a power of 10. Like our money system, SI is a metric system. For scientific work, and for everyday measuring in most countries, the International System of Units (SI) is used. For everyday measuring we still use English units such as the inch, quart, and pound. Introduction In many scientific investigations, Forensics included, precise measurements must be made before observations can be interpreted.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |