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CCHS CHEMISTRY LAB PROCEDURES THINGS YOU SHOULD AND SHOULDN’T DO IN LAB.

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Presentation on theme: "CCHS CHEMISTRY LAB PROCEDURES THINGS YOU SHOULD AND SHOULDN’T DO IN LAB."— Presentation transcript:

1 CCHS CHEMISTRY LAB PROCEDURES THINGS YOU SHOULD AND SHOULDN’T DO IN LAB.

2 CCHS CHEMISTRY LAB BOTTLES RETURN stock bottles to side shelf as quickly as possible. RETURN stock bottles to side shelf as quickly as possible. - Do not dispense chemicals at the side shelf. - Do not dispense chemicals at the side shelf. Replace CAP immediately and securely. Replace CAP immediately and securely. - do not leave caps on table or put on different bottle. - do not leave caps on table or put on different bottle.

3 CCHS CHEMISTRY LAB BOTTLES Never dip SPATULA or PIPETTE into stock bottle. Never dip SPATULA or PIPETTE into stock bottle. Never return EXCESS MATERIAL to stock bottle. Never return EXCESS MATERIAL to stock bottle. Use a ROLLING MOTION to get a small amount of solid from a stock bottle. Use a ROLLING MOTION to get a small amount of solid from a stock bottle.

4 CCHS CHEMISTRY LAB BOTTLES Take SMALL AMOUNTS of chemicals - don’t waste. Take SMALL AMOUNTS of chemicals - don’t waste.

5 CCHS CHEMISTRY DISPOSAL OF WASTE SOLUBLE, HARMLESS substs. - wash down the drain with lots of water. SOLUBLE, HARMLESS substs. - wash down the drain with lots of water. ACIDS - neutralize in washing soda soln. and put down drain. ACIDS - neutralize in washing soda soln. and put down drain. HARMFUL CHEMICALS - put in special, marked containers provided. HARMFUL CHEMICALS - put in special, marked containers provided.

6 CCHS CHEMISTRY DISPOSAL OF WASTE BROKEN GLASS and HARMLESS INSOLUBLE SOLIDS - in waste bucket - no paper. BROKEN GLASS and HARMLESS INSOLUBLE SOLIDS - in waste bucket - no paper. PAPER - in proper trash can - NO GLASS in trash can. PAPER - in proper trash can - NO GLASS in trash can. MATCHES - in soda (pop) cans. MATCHES - in soda (pop) cans.

7 CCHS CHEMISTRY LEARN PROPER NAMES OF ALL APPARATUS.

8 CCHS CHEMISTRY BUNSEN BURNERS Learn to LIGHT AND ADJUST different burners properly. Learn to LIGHT AND ADJUST different burners properly. - Blue flame with 2 cones cm, little or no roaring. Use FISHER BURNERS only where high temp. is needed. Use FISHER BURNERS only where high temp. is needed. Become familiar with aVARIETY OF BURNERS. Become familiar with a VARIETY OF BURNERS.

9 CCHS CHEMISTRY MANIPULATION OF GLASS TUBING A. Cutting Make 1 scratch with a triangular file.Make 1 scratch with a triangular file. Protect your hands with paper towel.Protect your hands with paper towel. Point scratch away from yourself and others.Point scratch away from yourself and others. Pull ends toward you in a quick snapping motion.Pull ends toward you in a quick snapping motion. Fire polish both ends.Fire polish both ends.

10 CCHS CHEMISTRY MANIPULATION OF GLASS TUBING B. BENDING Use wing tip (flame spreader).Use wing tip (flame spreader). Heat evenly entire area to be bent.Heat evenly entire area to be bent. Remove from flame and bend slowly.Remove from flame and bend slowly. Place hot glass on ceramic tile.Place hot glass on ceramic tile.

11 CCHS CHEMISTRY MANIPULATION OF GLASS TUBING HOT GLASS AND COLD GLASS LOOK THE SAME!! HOT GLASS AND COLD GLASS LOOK THE SAME!!

12 CCHS CHEMISTRY HEATING A TEST TUBE HOLD near the top with a test tube holder. HOLD near the top with a test tube holder. Don’t allow the FLAME to touch the holder. Don’t allow the FLAME to touch the holder. FILL test tube less than half full. FILL test tube less than half full.

13 CCHS CHEMISTRY HEATING A TEST TUBE SLANT test tube. SLANT test tube. POINT test tube away from others. POINT test tube away from others. MOVE test tube in flame - Constant Motion. MOVE test tube in flame - Constant Motion. Heat BELOW the surface of the liquid. Heat BELOW the surface of the liquid.

14 CCHS CHEMISTRY HEATING A TEST TUBE Know the difference between BOIL and HEAT. Know the difference between BOIL and HEAT.

15 CCHS CHEMISTRY POURING LIQUIDS Hold at ARMS LENGTH. Hold at ARMS LENGTH. Pour OVER SINK. Pour OVER SINK. RINSE outside of bottle when finished. RINSE outside of bottle when finished. Pouring from REAGENT BOTTLE, hold lip to lip. Pouring from REAGENT BOTTLE, hold lip to lip.

16 CCHS CHEMISTRY POURING LIQUIDS Pouring from TEST TUBES, hold lip to lip. Pouring from TEST TUBES, hold lip to lip. Use a STIRRING ROD when pouring from a beaker. Use a STIRRING ROD when pouring from a beaker.

17 CCHS CHEMISTRY USING FILTER PAPER WITH FUNNEL Fold paper in fourths. Fold paper in fourths. Open so paper resembles a cone. Open so paper resembles a cone. Place paper in funnel so that 1 cm of funnel is exposed. Place paper in funnel so that 1 cm of funnel is exposed. Wet paper with solvent (usually water). Wet paper with solvent (usually water).

18 CCHS CHEMISTRY USING A FUNNEL Use funnelaire, filter rack, or iron ring to support funnel. Use funnelaire, filter rack, or iron ring to support funnel. Make sure stem of funnel is touching side of beaker. Make sure stem of funnel is touching side of beaker.

19 CCHS CHEMISTRY USING A FUNNEL Keep filter filled to about 1cm from top of filter paper. Keep filter filled to about 1cm from top of filter paper.

20 CCHS CHEMISTRY TRANSFERRING SOLIDS If transferring a small amount, use a spatula. If transferring a small amount, use a spatula. Remember never dip into stock bottle.Remember never dip into stock bottle.

21 CCHS CHEMISTRY TRANSFERRING SOLIDS If transferring larger amounts use a small piece of paper. If transferring larger amounts use a small piece of paper. Put solid on paper. Put solid on paper. Roll paper or fold in half to pour solid.Roll paper or fold in half to pour solid.

22 CCHS CHEMISTRY DETECTING ODORS Use a wafting motion to detect odors. Use a wafting motion to detect odors. Never deeply inhale fumes. Never deeply inhale fumes. Never put your face directly over chemicals to detect odors. Never put your face directly over chemicals to detect odors.

23 CCHS CHEMISTRY INSERTING GLASS TUBING INTO RUBBER STOPPER Find stopper with proper size hole. Find stopper with proper size hole. Should fit snugly.Should fit snugly. Lubricate tubing and stopper with glycerin or water. Lubricate tubing and stopper with glycerin or water. Don’t use too much.Don’t use too much.

24 CCHS CHEMISTRY INSERTING GLASS TUBING INTO RUBBER STOPPER Insert with twisting motion. Insert with twisting motion. Don’t push too hard.Don’t push too hard. End of tubing should be below the level of the liquid. End of tubing should be below the level of the liquid.

25 CCHS CHEMISTRY DECANTING Decanting - Pouring a liquid off of a settled solid. Decanting - Pouring a liquid off of a settled solid. Use a stirring rod. Use a stirring rod. Pour slowly. Pour slowly.

26 CCHS CHEMISTRY USING TEST PAPERS Never dip test papers into liquid. Never dip test papers into liquid. Place test paper on glass square. Place test paper on glass square. Using a clean stirring rod, place a drop of liquid to be tested on paper. Using a clean stirring rod, place a drop of liquid to be tested on paper.

27 CCHS CHEMISTRY USING TEST PAPERS Litmus paper is used to test for acid or base. Litmus paper is used to test for acid or base. Cobalt chloride paper is used to test for the presence of water. Cobalt chloride paper is used to test for the presence of water. Must be dry (blue) before use.Must be dry (blue) before use.

28 CCHS CHEMISTRY HEATING CRUCIBLES, EVAPORATING DISHES, and any other porcelain or ceramic apparatus should be heated using a pipe- stem triangle as a support. CRUCIBLES, EVAPORATING DISHES, and any other porcelain or ceramic apparatus should be heated using a pipe- stem triangle as a support.

29 CCHS CHEMISTRY HEATING BEAKERS, FLASKS, and other glassware should be heated using a wire gauze as a support. BEAKERS, FLASKS, and other glassware should be heated using a wire gauze as a support.

30 CCHS CHEMISTRY CLEAN UP SEE “Good Housekeeping” HANDOUT. SEE “Good Housekeeping” HANDOUT. Keeping your area clean is your responsibility. Keeping your area clean is your responsibility. Always WASH HANDS before leaving lab. Always WASH HANDS before leaving lab.

31 CCHS CHEMISTRY ALWAYS BE SAFE!!!

32 CCHS CHEMISTRY


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