Introduction to Science Lesson 5: Lab Equipment

Bell Work Name and describe 2 of branches of Science. What are the 4 step to the Technological Design? How does Technological Design differ from the Scientific Method?

Today’s Agenda Bell Work Guided Notes Exit Slip

Review Lab Safety

Lab Safety One of the first things a scientist learns is how a lab operates. This includes being safe in the lab. While working in the lab can be very exciting, it can also be very dangerous if proper safety rules are not followed correctly. The next few slides will discuss some of the safety precautions for this science lab.

General Lab Procedures Know where all safety equipment and the first aid kit are located. Tell the teacher IMMEDIATELY of any injury. Read all directions BEFORE conducting the lab. Follow only the directions in the lab. Do not begin any lab until you are instructed to do so. Follow all rules set for the lab. Any deviation from the rules will result in your removal from the lab. No one leaves the classroom until the lab is all cleaned up. Everyone is responsible for cleaning up before they leave.

Dress Code Wear safety goggles whenever you are working with any substance which can get into your eye. Wear a laboratory apron or coat whenever you are working with materials which can get onto your clothing. Tie back long hair. Remove necklaces and bracelets which can hang down and touch the materials being used.

Glassware and Sharp Objects Use only clean glassware that is instructed per the procedures of the lab. If you break glass, tell the teacher IMMEDIATELY. Do NOT try to clean it up yourself. When using sharp objects, point them away from yourself and wear goggles at all times. After using glassware, clean it according to the teacher’s instructions.

Lab Equipment

Lab Equipment When working in any lab, it is important to be familiar with the equipment.

Test Tubes Used to Do Not use: Use a test tube rack to hold test tubes Transfer liquids Mix liquids Heat liquids Do Not use: Measuring Use a test tube rack to hold test tubes Use a test to clamp to move test tubes

Beaker & Erlenmeyer Flask Use: To hold large amounts of liquid Mixing chemicals Heating chemicals Not Used Measuring exact quantities of liquids Drinking and eating out of

Graduated Cylinders Use Do not use Measure precise liquids Do not use For mixing liquids Determine the volume contained in a graduated cylinder by reading the bottom of the meniscus at eye level. meniscus

Triple Beam Balance / Digital Scale Use To measure the mass of a solid Will measure in grams Do Not Use For large objects

MICROSCOPES

Microscopy Microscopes – produce an enlarged image of an object Used to study organisms, cells, and cell parts Increase in apparent size is called magnification The ability to show details clearly is called resolution Microscopes vary in both magnification and resolution

Dissecting Microscope Low Power Cannot produce 3D images nor look through a specimen Used to view living specimens mainly.

Compound Light Microscopes Specimen mounted on a glass slide Must be thinly sliced or very small Pair of lenses Ocular lens (eye piece) Objective lens (nose piece) Can be used to study LIVE specimens

Transmission Electron Microscope Transmission EM (TEM) Uses a beam of electrons to produce an enlarged image of very thinly sliced specimen on screen or photographic plate Image focused by magnetic lenses 200,000X magnification Cannot be used to view living specimens

Scanning Electron Microscope Scanning EM (SEM) 3D image Specimens not sliced for viewing Surface sprayed with fine metal coating Also uses electron beam and fluorescent screen or photographic plates 100,000X magnification Cannot be used to view living specimens

Electron Microscopes SEM TEM

Exit Slip What is a hypothesis? What is a scientific theory? What are the different types of microscopes? What is the dress code for the lab?