safety symbols the following safety symbols are used in bc science connections 9 to alert you to possible danger. be sure that you understand each symbol used in an activity or investigation before you begin. disposal alert this symbol appears when care must be taken to dispose of materials properly. thermal safety this symbol appears as a reminder to be careful when handling hot objects. sharp object safety this symbol appears when there is danger of cuts or punctures caused by the use of sharp objects. electrical safety this symbol appears as a reminder to be careful when using electrical equipment. skin protection safety this symbol appears when the use of caustic chemicals might irritate the skin or when contact with microorganisms might transmit infection. clothing protection safety a lab apron should be worn when this symbol appears. fire safety this symbol appears as a reminder to be careful around open flames. eye safety this symbol appears when there is danger to the eyes and safety glasses should be worn. fume safety this symbol appears when chemicals or chemical reactions could cause dangerous fumes. chemical safety this symbol appears when chemicals could cause burns or are poisons if absorbed through the skin. safety symbols use with textbook page xiv for each description of a procedure in an investigation, identify at least two safety symbols you would expect to see as a reminder of some safety precautions that should be taken. 1. description of procedure: use a razor blade to cut open a sea star. safety symbols: reason why these safety symbols are used: 2. mix hydrochloric acid with some sodium hydroxide in a test tube. 3. heat a test tube containing calcium carbonate over a bunsen burner for 5 minutes. 4. add hydrochloric acid to a piece of magnesium ribbon in a test tube. a gas will be produced. 5. prepare a wet mount slide. then, use a microscope to view plant cells on the slide.

Question

Accepted Answer

To solve this, we analyze each procedure:

### Procedure 1: Use a razor blade to cut open a sea star
- **Safety Symbols**: Sharp Object Safety (due to razor blade, risk of cuts) and Skin Protection Safety (razor can cut skin).
- **Reason**: Razor blades are sharp (Sharp Object Safety reminder to avoid cuts) and can injure skin (Skin Protection Safety to prevent infections from cuts).

### Procedure 2: Mix hydrochloric acid with sodium hydroxide in a test tube
- **Safety Symbols**: Chemical Safety (acids/bases can cause burns), Eye Safety (fumes or splashes harm eyes), and Skin Protection Safety (acids/bases irritate skin).
- **Reason**: Acids and bases are caustic (Chemical Safety for burns), fumes/splashes risk eye injury (Eye Safety for goggles), and contact irritates skin (Skin Protection Safety for gloves).

### Procedure 3: Heat a test tube with calcium carbonate over a burner for 5 minutes
- **Safety Symbols**: Fire Safety (using a burner, fire risk), Clothing Protection Safety (lab apron to protect from spills/fire), and Thermal Safety (hot test tube, burn risk).
- **Reason**: Burners involve fire (Fire Safety reminder), lab aprons protect from flames/spills (Clothing Protection Safety), and hot glass/test tubes cause burns (Thermal Safety reminder).

### Procedure 4: Add hydrochloric acid to magnesium ribbon in a test tube
- **Safety Symbols**: Chemical Safety (acid + metal reaction, fumes/burns), Fume Safety (reaction may produce harmful fumes), and Eye Safety (fumes/splashes harm eyes).
- **Reason**: Acid-metal reactions release fumes (Fume Safety reminder), acids are caustic (Chemical Safety for burns), and fumes/splashes risk eye injury (Eye Safety for goggles).

### Procedure 5: Prepare a wet mount slide, then use a microscope to view paramecia
- **Safety Symbols**: Skin Protection Safety (glass slides can cut skin) and Eye Safety (microscope use, eye strain/protection).
- **Reason**: Glass slides are sharp (Skin Protection Safety to avoid cuts) and microscopes require eye protection (Eye Safety for proper viewing/protection).

### Final Answers (for each procedure):
1. **Safety Symbols**: Sharp Object Safety, Skin Protection Safety
   **Reason**: Razor blades are sharp (cuts) and risk skin injury (infection).

2. **Safety Symbols**: Chemical Safety, Eye Safety, Skin Protection Safety
   **Reason**: Acids/bases are caustic (burns), fumes/splashes harm eyes, and irritate skin.

3. **Safety Symbols**: Fire Safety, Clothing Protection Safety, Thermal Safety
   **Reason**: Burner (fire), lab apron (protection), hot glass (burns).

4. **Safety Symbols**: Chemical Safety, Fume Safety, Eye Safety
   **Reason**: Acid-metal reaction (fumes/burns), fumes (harmful), eye injury risk.

5. **Safety Symbols**: Skin Protection Safety, Eye Safety
   **Reason**: Glass slides (cuts), microscope use (eye protection).

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QUESTION IMAGE

Question

Explanation:

Procedure 1: Use a razor blade to cut open a sea star

Procedure 2: Mix hydrochloric acid with sodium hydroxide in a test tube

Procedure 3: Heat a test tube with calcium carbonate over a burner for 5 minutes

Procedure 4: Add hydrochloric acid to magnesium ribbon in a test tube

Procedure 5: Prepare a wet mount slide, then use a microscope to view paramecia

Final Answers (for each procedure):

Answer: