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LABORATORY SAFETY RULES

LABORATORY SAFETY RULES. Understand the instructions before you start the investigation . Do not eat or drink in a laboratory Do not enter a laboratory without the teacher’ permission. Wash all the apparatus after use. Do not run about or play in a laboratory.

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LABORATORY SAFETY RULES

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  1. LABORATORY SAFETY RULES • Understand the instructions before you start the investigation. • Do not eat or drink in a laboratory • Do not enter a laboratory without the teacher’ permission. • Wash all the apparatus after use. • Do not run about or play in a laboratory. • Do not test anything without the teacher’s instruction • Report any breakage of apparatus or accident to the teacher immediately. • Check the label on the container to make sure that you are using the • correct chemical

  2. Laboratory apparatus Test tube holder Test tube Test tube rack Filter Funnel measuring cylinder Gas jar Beaker Conical flask Clamp Wire gauze Bunsen burner Burette Pippete Retort stand Tripod stand Evaporating dish spatula

  3. PMR 2012

  4. Vernier caliper Micrometer screw gauge

  5. Burette - Volume 50 cm3 Pipette - volume 5, 15, 20,25 ml

  6. HAZARD WARNING SYMBOLS poisonous • Alcohol Concentrated acid or alkali • Mercury • Uranium, • plutonium • Chlorofom , • bromine vapour Sodium , hydrogen

  7. Scientific investigation

  8. Continue……

  9. iii. State the relationship between the time taken for the Blanket to dry and the surface area of the blanket. …………………………………………………………………………………………. ………………………………………………………………………………………….

  10. Investigation what affects the swing of a pendulumApparatus and MaterialsMetal bob, string, Meter rule, retot stand and stopwatch.DeterminingDoes the length of pendulum affect the swing of the pendulum.Planning the experiment1.Displace the metal bob through the small angel and let it go and start • the stop watch.2. Stop the stopwatch after 20 complete swing3.Record the time. 4.Repeat steps above by using different length • Observation Y X One complete swing Conclusion 1.Pendulum has takes a longer time when the string is longer and takes a short times when string is shorter 2.Pendulum is faster when string is shorter

  11. DAY DATE PHYSICAL QUANTITIES AND THEIR UNITS1. We measure these quantities in SI units. SI means International of system2. Five basic quantities and their SI unitsTemperature units0 C = 273 K37 C = 310K100 C = 373K Meter (m) Kilogram (kg) Weight Newton (N) Second (s) Kelvin (K) Ampere ( A )

  12. DAY DATE THE CONCEPT OF WEIGHT AND MASS What is the different between weight and mass Pull of the Earth / gravity Quantity of matter Newton (N) Kilogram (Kg) Spring balance Electronik balance level balance Triple beam balance

  13. DAY DATE Activity Measuring the weight and the mass of some objects Appratus and Materials : Triple –beam balance, Spring balance, weight of 10 g,20 g, and any object in laboratory. Procedure : 1.Put a 10 g weight on a triple –beam balance to measure its mass.2. Repeat step 1 with other weight and object 3. Measure the weight of all the weight and object with spring balance . Precaution : Use only suitable objects so that you do not damage the spring balance Record your result in the table level balance Conclution :

  14. DATE : MEASURING LENGTHS A. Investigating the relationship between units of length B. Learning the correct method of taking reading from the scale of a meter rule straight line Apparatus and materials: Meter rule figure 1.11 Figure 1.10 Procedure 1. Look at your meter rule a. How many centimeters(cm) in 1 meter (m) b. How many milimeters (mm) are there in 1 centimeters (cm) C.How many milimeters (mm) are there in 1meter (m) figure 1.12 • How long is PQ in cm and mm ( Figure 1.11 ) • a. PQ in cm • b. PQ in mm 3. Which Eye position gives you an accurate reading (figure 1.12)

  15. DATE : Measuring the lengths of straight lines by using a rulerApparatus and Materials : Meter rulePerocedure :1.Mesure the length of straight line in figure 1.13. 2.Record your measurements in the table below B A C Figure 1.13

  16. DAY DATE 3.Measuring the length and the width of your table , length and width of the blackboard 4.Repeat your measurement and get the average reading . Why do you need the average reading?

  17. DATE : Activity:Measure the length of a curved lineApparatus and materials :20 cm thread and rulerProcedure1. Make a knot at one of the thread2. Put the knot on one end of the curved line.3. Trace the thread on the curved until it reaches the other end of the line4. Measure the length of the thread5.Record the measurement in a table

  18. DAY DATE

  19. DAY: DATE: Activity:Measuring diameter by using calipers and rulerApparatus and Materials : Internal calipers, external calipers , ruler, test tube ,beakers 100 ml and 200 ml.Procedure : 1. Open the arms of external calipers. Then close the arms until touch the wall of the test tube. 2.Remove the calipers slowly and measure using the ruler. 3. By the using the same method. Measure the external diameter beakers 100ml and 250ml 4. Repeat your measurement using the internal calipers 5. Record all of your measurement internal calipers externalcalipers

  20. DAY DATE

  21. DAY MEASURING AREA a. Measuring the area of a regular shape b. Measuring the area of an irregular shapeProcedure:1.Look at the square ABCD and PQRS and the rectangle WXYZ ( figure 1.21 in teks book) a. What is area, in square milimeter (mm ) , of a small square in ABCD?b.What is the total area of all the small square inside ABCD in i. Square milimeter (mm ) ? ii. Square centimeter (cm )?c.How many square of ABCD can we put into PQRS?d.What is the area of PQRS in i. Square milimeter (mm )? ii. Square centimeter (cm )?e. How many square of ABCD can we put into WXYZ?f. What is the area of WXYZ in i.Square milimeter (mm )? Ii.Square centimeter (cm )? 2

  22. 2.Put the leaf on a piece of graph paper. Trace its shape onto the graph paper.3.Tick ( ) each square that is shape of the leaf. And also tick ( ) the square half covered by the leafi. How many tick ( ) did you make? Ii. Can you estimate the area of the leaf?

  23. DAY DATE: C. MEASURING VOLUME 1. We use measuring cylinders, burettes and pipettes to measure volume 2. Volume of liquid in millimeter (ml) and centimeter (cm )Measuring the volume of liquid with a measuring cylindersApparatus and materialsMeasuring cylinders, test tube, white paper and beakers of different volumesProcedure1. pour some water into measuring cylinders and look at the surface of the water a. if the surface of the water curved or flat? b. Which is the correct eye position when taking a reading c. what is the volume of the water2. Pour the water in the test tube into the measuring cylinders. Record you result3. Repeat step 2 using water in the beakers.4. Record all the reading in the table 3 Activity white paper

  24. DAY DATE

  25. DAY: DATE Measuring the volume of liquid with a pipetteApparatus pipette, conical flask, suction pump , coloured water and beakersProcedure1.Look at scale on a pipettei. What is the maximun volume that the pipette can measure? ii. Where is the position of the zero mark?2.Fill a conical flask with some coloured water. Dip the tip of the pipette into the coloured water.3. Using the suction pump, suck out the coloured water until it reached it the zero mark.Place the tip of the pipette into empty beakers. Let the coloured water flow out of the pipette suction pump

  26. HOW TO USE TE SUCTION PUMP Press Press Press Press Press Water out

  27. DAY: Measuring the volume of liquid with a buretteapparatusBurette, retort stand, beaker, filter funnelProcedure1.Look at the burettei. What the maximun volume that the burette can measure? ii. Where is the zero mark?2.Clamp the burette to the retort stand.3.Put the filter funnel into the mouth of the burette.4.Pour some water until the water level to the zero mark5.Place the empty beaker below the burette6.Turn the burette tap to release the water.When the water nears a level 20ml turn of the tap7.Turn on the tap slowly to let the water drop by drop . Turn off the tap when the water level reaches 20ml8.Repeat to get 15ml, 10ml, 5ml of water. clamp

  28. DAY Teusday DATE: Measuring the volume of an irregular and regular shaped solid by the water displacement method Apparatus100ml measuring cylinder, thread, a small stone, big stone, Procedure a. Volume of an irregular shaped solid 1. Pour 50 ml of water into measuring cylinder. 2.Tie a small stone with a thread and lower into measuring cylinder 3.record the new water leveli. What is the volume of the water displaced by the stone? Ii. What is the volume of the stone 4.Find out the volume of other irregular shape 5.Record your result

  29. Ingat Mu Pondan Cantik Comel Aku Minat weh

  30. Penutup 1. Baca Surah Al-`Ashr 2. Tasbih Kifarah.

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