Question

1. which safety rule is most important when working with chemicals? a. never wear gloves b. wear safety goggles c. taste all substances d. work without supervision 9. the microscope lens closest to your eye is called the: a. objective lens b. eyepiece c. diaphragm d. stage clip 10. when using a microscope, always start focusing with: a. high power lens b. oil immersion lens c. low power lens d. 100x lens

Explanation:

• Question 8: When working with chemicals, wearing safety goggles is crucial to protect the eyes from potential splashes or fumes. Wearing gloves is often necessary (so A is wrong), tasting substances is extremely dangerous (C is wrong), and working without supervision is unsafe (D is wrong).
• Question 9: The eyepiece is the lens closest to the eye in a microscope. The objective lens is near the specimen, the diaphragm controls light, and the stage clip holds the slide.
• Question 10: When using a microscope, it is standard practice to start focusing with the low - power lens. This allows for a wider field of view and easier initial focusing compared to high - power or oil - immersion lenses.

Answer:

1. B. Wear safety goggles
2. B. Eyepiece
3. C. Low power lens