Question

the lab burner

1. never leave a lit burner __________________________!
2. heated and cooled glass look __________________________!

use caution and handle ____________ glassware with ________________________

1. do not place hot glassware ________________________ or in ________________________.
2. never heat a __________________________.
3. keep __________________________ away from open flames.
4. don’t look directly into a __________________________ that is being heated.
5. point the end of a test tube being heated __________________________

electricity

1. don’t let electrical cords __________________________.
2. keep all electrical cords, wires, and appliances away from ______________.

end of lab

1. clean and put away all __________________________ at the end of the lab period.
2. dispose of waste products __________________________.
3. always __________________________.

Explanation:

To solve these lab safety fill - in - the - blank questions, we rely on standard laboratory safety knowledge:

The Lab Burner

1. Step 1: Analyze the first blank

In a laboratory, a lit burner should never be left unattended. So the answer is "unattended".

1. Step 2: Analyze the second and third blanks (Heated and cooled glass)

Heated and cooled glass look the same. We should handle hot glassware with care (for example, using tongs or a cloth). So the blanks are "the same" and "hot" and "care (or tongs, a cloth etc.)".

1. Step 3: Analyze the third question (Hot glassware placement)

Hot glassware should not be placed on a cold surface or in cold water (as it can crack). So the blanks are "on a cold surface" and "cold water".

1. Step 4: Analyze the fourth question (Heating a closed container)

Never heat a closed container (it can explode due to pressure build - up). So the blank is "closed container".

1. Step 5: Analyze the fifth question (Flammable materials and open flames)

Keep flammable materials (like alcohol, paper) away from open flames. So the blank is "flammable materials".

1. Step 6: Analyze the sixth question (Looking into a heated container)

Don't look directly into a test tube (or other container) that is being heated. So the blank is "test tube (or other container)".

1. Step 7: Analyze the seventh question (Test tube heating direction)

Point the end of a test tube being heated away from people (to prevent injury from splashing chemicals). So the blank is "away from people".

Electricity

1. Step 1: Analyze the first blank (Electrical cords)

Don't let electrical cords be frayed or damaged (to prevent electric shock). Also, they should not be in water or under objects that can damage them. A common answer is "be frayed (or in water, under objects)".

1. Step 2: Analyze the second blank (Electrical equipment and water)

Keep all electrical cords, wires, and appliances away from water (to prevent electric shock). So the blank is "water".

End of Lab

1. Step 1: Analyze the first blank (Cleaning at the end of lab)

Clean and put away all equipment (like glassware, tools) at the end of the lab period. So the blank is "equipment (or glassware, tools)".

1. Step 2: Analyze the second blank (Waste disposal)

Dispose of waste products according to lab instructions (in the correct waste containers). So the blank is "according to lab instructions (or in the correct waste containers)".

1. Step 3: Analyze the third blank (End of lab procedure)

Always wash your hands (to remove any chemicals) at the end of the lab. So the blank is "wash your hands".

Answer:

s (selected key blanks as examples, full answers depend on standard lab safety teachings):

1. (The Lab Burner - 1) unattended
2. (The Lab Burner - 2) the same; hot; care
3. (The Lab Burner - 3) on a cold surface; cold water
4. (The Lab Burner - 4) closed container
5. (The Lab Burner - 5) flammable materials
6. (The Lab Burner - 6) test tube
7. (The Lab Burner - 7) away from people
8. (Electricity - 1) be frayed
9. (Electricity - 2) water
10. (End of Lab - 1) equipment
11. (End of Lab - 2) according to lab instructions
12. (End of Lab - 3) wash your hands