Lesson: LABORATORY SYMBOL AND SAFETY DEVICES- SUBJECT NAME: INTEGRATED SCIENCE
B.LESSON REFERENCE NUMBER: 6
C. LESSON TITLE: SAFETY PRECAUTIONS IN THE LABORATORY
D. LESSON DESCRIPTION:
At the end of the activities, the students should be able:
1. identify standard safety symbols and devices in the laboratory;
2. explain the significance of the symbols and devices in doing laboratory work.;
3. design laboratory safety symbols;
4. develop creativity in group work;
5. show awareness, vigilance, presence of mind and self-discipline.
E. REVIEW OF PREVIOUS LEARNING LESSON: Sample apparatus, their uses and classification
Apparatus | Uses/Function | Basis of Classification |
1. Balance, set of weights 2. Graduated cylinder 3. Thermometer 4. Alcohol burner/Bunsen burner 5. Flask, beakers, test tubes 6. Reagent bottles | measure mass measure volume measures temperature heat substance/mixture container for liquids container for liquids | measuring measuring measuring heating handling liquids storing solids and liquids |
G. LEARNING PRESENTATION:
H. LEARNING ACTIVITY:
Safety precautions in the laboratory. (adopted from Integrated Science I by Villamil and Science and Technology I by Lianko).
o Think in terms of safe practices at all times.
o Be familiar with every step you do.
o Act promptly and calmly when confronted with an emergency. A first aid kit should always be available.
o Check the apparatus, item and chemical at least twice before use. Glass apparatus should be handled with care.
o Volatile and inflammable liquids should be kept away from open flames so as to avoid burns and fires.
o Valves of heating devices should be properly closed when not in use to avoid over heating.
o Measuring scales should likewise be handled properly so as not to affect their accuracy and equilibrium.
o Handling solid substances, heating test tubes, and filtering substances in the laboratory should also be done properly.
I. LEARNING EVALUATION
1. Locate and encircle some safety devices and materials in the puzzle below:
II.
G | P | A | I | L | O | F | S | A | N | D |
T | O | N | I | C | F | A | L | S | E | O |
P | A | O | S | W | A | T | E | R | V | O |
B | A | R | G | B | U | R | N | S | E | H |
N | A | P | L | L | C | A | C | U | R | E |
R | I | A | O | W | E | A | R | M | O | M |
S | T | O | V | A | T | S | A | A | M | U |
X | I | C | E | I | K | N | I | S | G | F |
F | I | R | S | T | A | I | D | K | I | T |
2. The following are safety devices usually found in laboratories. Fill in the missing letters and identify the device.
- a. __o__gl__s - eye protector
- b. g__ov__s - protect your hands
- c. F__r__E__ti__ __ ui__h__r - put off flame
- d. __ir__t A__d _it - contains medicines
- e. L__b__ __at__r__ A__r__n - body protector
