Section 4 Tools and Techniques Chapter 1 Objectives List the function of each of the major parts of a compound microscope.List the function of each of.

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Presentation transcript:

Section 4 Tools and Techniques Chapter 1 Objectives List the function of each of the major parts of a compound microscope.List the function of each of the major parts of a compound microscope. Compare two kinds of electron microscopes.Compare two kinds of electron microscopes. Describe the importance of having the SI system of measurement.Describe the importance of having the SI system of measurement. State some examples of good laboratory practice.State some examples of good laboratory practice.

Section 4 Tool and Techniques Chapter 1 Microscopes as Tools Light MicroscopesLight Microscopes –A compound light microscope is a microscope that shines light through a specimen and has two lenses to magnify an image. –Four major parts of a compound light microscope are the ocular lens, objective lens, stage, and light source.

Section 4 Tool and Techniques Chapter 1 Microscopes as Tools Light MicroscopesLight Microscopes –The eyepiece magnifies the image. –The objective lens enlarges the specimen. –The stage is a platform that supports slides with specimens. –The light source is a light bulb that provides light for viewing images.

Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Magnification and ResolutionMagnification and Resolution –Magnification is the increase of an object’s apparent size. –Resolution is the power to show details clearly in an image.

Section 4 Tool and Techniques Chapter 1 Object Size and Magnifying Power of Microscopes

Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Electron MicroscopesElectron Microscopes –In an electron microscope, a beam of electrons produces an enlarged image of the specimen. –Electron microscopes provide greater magnification and resolution than light microscopes.

Section 4 Tool and Techniques Chapter 1 Microscopes as Tools, continued Electron MicroscopesElectron Microscopes –Scanning electron microscopes pass a beam of electrons over the specimen’s surface for better viewing the external surface of a specimen. –Transmission electron microscopes transmit a beam of electrons through a thinly sliced specimen for better viewing the internal structures of a specimen.

Section 4 Tool and Techniques Chapter 1 Units of Measurement Base and Other UnitsBase and Other Units –Scientists use a single, standard system of measurement, called the metric system. The official name of the metric system is Système International d’Unités or SI.

Section 4 Tool and Techniques Chapter 1 Units of Measurement Base and Other UnitsBase and Other Units –The metric system has seven base units.

Section 4 Tool and Techniques Chapter 1 Safety Good Laboratory PracticeGood Laboratory Practice –Lab safety involves safe and common-sense habits such as never working alone in a lab or without proper supervision by the teacher.