Saliva

In: Science

Submitted By TanXiaoFang
Words 799
Pages 4
a
UNIVERSITI TUNKU ABDUL RAHMAN

|Centre |: |Centre for Foundation Studies (CFS) | |Unit Code |: |FHSP 1014 |
|Course |: |Foundation in Science | |Unit Title |: |Physics I |
|Year/ Trimester |: |Year 1 / Trimester 1 | |Lecturer |: |Ms.Nurfadzilah |
|Session | | | | | |Mr Chin Kong Yew |
| |: |2014/05 | | | | |

Tutorial 1: Introduction

1. How many significant figures do each of the following numbers have: (a) 214, (b) 81.60, (c) 7.03, (d) 0.03, (e) 0.0086, (f) 3236, and (g) 8700?

2. Write the following into scientific notation (a) 165 000 000 (b) 0.0446 (c) 0.0005 (d) 11 000

3. (a) The diameter of the earth is about 1.27 x 107 m. Find its diameter in (i) Millimeters, (ii) Mega-meters [Answer: 1.27(1010 mm; 12.7 Mm]

(b) Express the following sum to the correct number of significant figures/decimal places: 1.80 m + 142.5 cm + 5.34 × 105 (m [Answer: 3.76 m]

(c) Express the following using the prefixes: (i) 1×106 volts, (ii) 2×10−6 meters, (iii) 6×103 days, (iv) 18×102 bucks, (v) 8×10−9 pieces.

4. (a) The volume of a wallet is 8.50 in3. Convert this value to m3, where 1 in. = 2.54 cm. [Answer:[pic]m3]

b) A solid piece of lead has a mass of 23.94 g and…...

Similar Documents

Slug of Saliva

...Last month, it was revealed that levels of a toxic pesticide more than 100 times the EU limit were present in a source of English drinking water. The discovery of record levels of metaldehyde – a chemical used in slug pesticides – was reported by Natural England and the Environment Agency at the River Stour, which supplies water to homes in Essex and Suffolk. There's currently no treatment method available to extract this chemical from drinking water – once it's there, we're drinking it. This isn't a sudden unexpected situation. The same problem occurred in many areas across Britain last autumn – when slug numbers exploded after the wet spring and summer, conditions that we're seeing emerge again. The problem was identified in autumn 2007, when new analytical techniques allowed testing for metaldehyde, and since then a voluntary stewardship programme with guidelines for the use of the chemical has been instituted. Yet this clearly isn't working. The obvious source – and use – of slug pellets is gardens, but what many may not know is that huge quantities of this chemical are being used to grow rape seed oil, winter beans, sugar beet and brassicas such as broccoli. That's reflected in the fact that the NFU offers a briefing on the issue. But one disturbing thing about that briefing is its focus on the chemical's use and alternative chemicals. The idea of integrated pest management does not even get a look in. The main predators of slugs in the UK are hedgehogs, frogs and wild......

Words: 262 - Pages: 2

Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions

...Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Objective : To investigate the action of saliva and 3 hydrochloric acid in two carbohydrate solution Results Table1: Observation Conclusion Solution A Benedict’s test: Blue coloration turned to brick red precipitate. Reducing sugar is present in the solution A. Iodine test: The coloration remained unchanged. Starch is absent in solution A. Solution B Benedict’s test: The blue coloration remained unchanged. Reducing sugar is absent in solution B. Iodine test: The coloration turn into dark blue coloration. Starch is present in solution B. Table 2: Tube Contents Temperature(°C) Benedict's Test-Colour Observation After min 5th min (from tubes 1 - 4 into 1' - 4') After 35th min (from tubes 1 - 4 into 1' - 4') 1 10 ml solution B 1 ml saliva 37 Blue coloration turned into translucent green. Blue coloration turned to green and finally moderate amount of brick red precipitate suspended in solution. The solution was opaque. 2 10 ml solution B 3 M HCI 37 The blue coloured solution remains unchanged. The blue coloured solution remains unchanged. 3 10 ml solution B 3 M HCI 95 White coloured translucent suspension formed in moderate amount. A very big amount of white suspension formed which is very opaque. Turned back into translucent and remaining solution was blue which is translucent. 4 10 ml solution B 1 ml saliva ......

Words: 587 - Pages: 3

Investigation of Action of Saliva and Hydrochloric Acid in Two Carbohydrate Solutions

...Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Title : Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Objective : To investigate the action of saliva and 3 hydrochloric acid in two carbohydrate solution Results Table1: Observation Conclusion Solution A Benedict’s test: Blue coloration turned to brick red precipitate. Reducing sugar is present in the solution A. Iodine test: The coloration remained unchanged. Starch is absent in solution A. Solution B Benedict’s test: The blue coloration remained unchanged. Reducing sugar is absent in solution B. Iodine test: The coloration turn into dark blue coloration. Starch is present in solution B. Table 2: Tube Contents Temperature(°C) Benedict's Test-Colour Observation After min 5th min (from tubes 1 - 4 into 1' - 4') After 35th min (from tubes 1 - 4 into 1' - 4') 1 10 ml solution B 1 ml saliva 37 Blue coloration turned into translucent green. Blue coloration turned to green and finally moderate amount of brick red precipitate suspended in solution. The solution was opaque. 2 10 ml solution B 3 M HCI 37 The blue coloured solution remains unchanged. The blue coloured solution remains unchanged. 3 10 ml solution B 3 M HCI 95 White coloured translucent suspension formed in moderate amount. A very big amount of white suspension formed which is very opaque. Turned......

Words: 321 - Pages: 2

The Action of Saliva on Starch

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Saliva Experiment

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Investigation of Action of Saliva and 2m Hydrochloric Acid in Two Carbohydrate Solutions

...Practical 3 Investigation of Action of Saliva and Hydrochloric Acid in Two Carbohydrate Solution | Objective: 1. To show the action of saliva in two carbohydrate solutions. 2. To show the action of hydrochloric acid in two carbohydrate solutions. Apparatus & Equipment’s: Boiling tubes Metal test tube racks Beaker Graduated plastic dropper Water bath,~37°C Water bath,~95°C Stop watch Test tube holder Materials: Carbohydrate solution A Carbohydrate solution B Benedict’s solution 3M Hydrochloric acid 3M Sodium hydroxide Procedures: 1. Prepared two boiling tubes with containing 1 ml solution A and 1 ml solution B respectively. 1 ml Benedict’s solution was added to each tube and heated both tubes together in the (~95°C) water bath for two minutes. Then, recorded the results in table 1. 2. Added a few drops of fresh solution A and B separately spaced on a white tile. On each solution, added 1-2 drops of iodine solution and mixed with pen cover. Recorded your observations in the table 1. 3. Pipetted 2 ml solution B into each of four boiling tubes. The tubes were labelled 1, 2, 3 and 4 respectively near mouth of tube. Labelled your group name. 4. Placed tubes 1 and 2 in a water bath of ~37°C. 5. Salivated into a small beaker until it reached about 5 ml. 6. At the same time, step (6) and (7) was to be done approximately. Measured out 4 ml of the saliva prepared in step (4) and pipetted 2 ml each into tubes 1 and 4. The contents of the tubes shook well to......

Words: 321 - Pages: 2

Action of Saliva

...nvestigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Title : Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Objective : To investigate the action of saliva and 3 hydrochloric acid in two carbohydrate solution Results Table1: Observation Conclusion Solution A Benedict’s test: Blue coloration turned to brick red precipitate. Reducing sugar is present in the solution A. Iodine test: The coloration remained unchanged. Starch is absent in solution A. Solution B Benedict’s test: The blue coloration remained unchanged. Reducing sugar is absent in solution B. Iodine test: The coloration turn into dark blue coloration. Starch is present in solution B. Table 2: Tube Contents Temperature(°C) Benedict's Test-Colour Observation After min 5th min (from tubes 1 - 4 into 1' - 4') After 35th min (from tubes 1 - 4 into 1' - 4') 1 10 ml solution B 1 ml saliva 37 Blue coloration turned into translucent green. Blue coloration turned to green and finally moderate amount of brick red precipitate suspended in solution. The solution was opaque. 2 10 ml solution B 3 M HCI 37 The blue coloured solution remains unchanged. The blue coloured solution remains unchanged. 3 10 ml solution B 3 M HCI 95 White coloured translucent suspension formed in moderate amount. A very big amount of white suspension formed which is very opaque. Turned back......

Words: 321 - Pages: 2

Starch on Saliva

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Saliva on Starch

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Saliva

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Investigation of Action of Saliva and Hydrochloric Acid in Two Carbohydrate Solutions

...Practical 3 Investigation of Action of Saliva and Hydrochloric Acid in Two Carbohydrate Solutions ____________________________________________________________________________________ Objective: Students are expected to state the objective of this experiment. Apparatus & Equipments: Boiling tubes Metal test tube racks Beaker Graduated plastic dropper Water bath, ~ 37 oC Water bath, ~ 95oC Materials: Carbohydrate solution A Carbohydrate solution B Benedict’s solution 3 M Hydrochloric acid 3 M Sodium hydroxide Procedures: 1. Prepare two boiling tubes containing 1 ml solution A and 1 ml solution B respectively. Add 1 ml Benedict’s solution to each tube. Heat both tubes together in the (~95oC) water bath for two minutes. Record the results in table 1. 2. Add a few drops of fresh solution A and B separately spaced on a white tile. On each solution, add 1-2 drops of iodine solution. Mix with pen cover. Record your observations in the table 1. 3. Pipette 2 ml solution B into each of four boiling tubes. Label the tubes 1, 2, 3 and 4 respectively near mouth of tube. Label your group name. 4. Place tubes 1 and 2 in a water bath of ~37oC. (It doesn’t matter how long you put it in at this stage as no saliva or HCl have been added yet). 5. Salivate into a small beaker till it reaches about 5 ml. 6. Step (6) and (7) is to be done approximately at the same time. Measure out 4 ml of the saliva prepared in step (4) and pipette 2 ml each into......

Words: 898 - Pages: 4

Investigation of Action of Saliva and Hcl

...Practical 5 Investigation of Action of Saliva and Hydrochloric Acid in Two Carbohydrate Solutions __________________________________________________________________________ Objective: Students are expected to state the objective of this experiment. Apparatus & Equipments: Boiling tubes Graduated plastic dropper Metal test tube racks o Water bath, ~ 37 C Beaker o Water bath, ~ 95 C Materials: Carbohydrate solution A 3 M Hydrochloric acid Carbohydrate solution B 3 M Sodium hydroxide Benedict’s solution Procedures: 1. Prepare two boiling tubes containing 1 ml solution A and 1 ml solution B respectively. Add 1 ml o Benedict’s solution to each tube. Heat both tubes together in the (~95 C) water bath for two minutes. Record the results in table 1. 2. Add a few drops of fresh solution A and B separately spaced on a white tile. On each solution, add 1-2 drops of iodine solution. Mix with pen cover. Record your observations in the table 1. 3. Pipette 2 ml solution B into each of four boiling tubes. Label the tubes 1, 2, 3 and 4 respectively near mouth of tube. Label your group name. 4. Place tubes 1 and 2 in a water bath of ~37 C. (It doesn’t matter how long you put it in at this stage as no saliva or HCl have been added yet). 5. Salivate into a small beaker till it reaches about 5 ml. 6. Step (6) and (7) is to be done approximately at the same time. Measure out 4 ml of the saliva prepared in step (4) and pipette......

Words: 930 - Pages: 4

Enzyme and Saliva Action

... The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with water to remove food residues (ii) Collect about 50 mm saliva. (c) Pour half the saliva into tube 2 and place the tube in the boiling water bath for 3 minutes. (d) Using a graduated pipette or syringe, add 5 cm3 2% starch solution to tubes 3,4 and 7. (e) Rinse the pipette or syringe and use it to transfer 5 cm3 boiled saliva from tube 2 to tube 3. Shake the tube sideways to mix the contents. (f) Use the graduated pipette or syringe to transfer 5 cm3 unboiled saliva from tube 1 to tube 4. Shake the tube to mix the contents. (g) Leave tubes 3 and 4 to stand for five minutes and copy the table below into your notebook. (h) After five minutes, pour half the contents of tube 3 (the boiled saliva and starch) into tube 5 and add three drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3, add about 20 mm Benedict's solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6......

Words: 1107 - Pages: 5

Identification of Unknown Carbohydrate Solution and Investigation of Action of Saliva and Hydrochloric Acid in Carbohydrate Solution at Two Different Temperatures

...Table of Contents: FHSB 1214 FHSC 1214 Biology I Cell Biology Introduction Practical 1 Practical 1 Cell Biology Biological Studies I molecules I Practical 2 Practical 2 Cell Biology Biological Studies II molecules II Practical 3 Cell Biology Studies III Practical 4 Cell Biology Studies IV Practical 8 Cell Biology Studies VIII Practical 5 Cell Biology Studies V Practical 6 Cell Biology Studies VI Practical 7 Cell Biology Studies VII Practical 9 Cell Biology Studies IX Practical 10 Cell Biology Studies X - Experiment Description Page Writing of Lab Reports Identification of Biomolecules 5 13 Identification of Unknown Carbohydrate Solutions and Investigation of Action of Saliva and HCl in Carbohydrate Solution at Two Different Temperatures Investigation of the Effects of Catalase Concentration on Hydrogen Peroxide Decomposition 20 Synthesis of Starch Using an Enzyme Extracted from Potato Tuber Investigation of the Effects of Different Catalytic Conditions on Hydrogen Peroxide Decomposition Microscopy 27 Practical 6 Cell studies II Practical 7 Cell studies III Extraction of Cell Organelles by Cell Fractionation Determination of Solute Potential of Potato Cell Sap 47 Practical 8 Cell studies IV Effects of Different Treatments on Stained Potato Cells 64 Practical 9 Energetics I Respiration of Germinating Beans 67 Microscopic Examination of Cells at Various Stages...

Words: 22060 - Pages: 89

Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions

...Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Title : Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Objective : To investigate the action of saliva and 3 hydrochloric acid in two carbohydrate solution Results Table1: Observation Conclusion Solution A Benedict’s test: Blue coloration turned to brick red precipitate. Reducing sugar is present in the solution A. Iodine test: The coloration remained unchanged. Starch is absent in solution A. Solution B Benedict’s test: The blue coloration remained unchanged. Reducing sugar is absent in solution B. Iodine test: The coloration turn into dark blue coloration. Starch is present in solution B. Table 2: Tube Contents Temperature(°C) Benedict's Test-Colour Observation After min 5th min (from tubes 1 - 4 into 1' - 4') After 35th min (from tubes 1 - 4 into 1' - 4') 1 10 ml solution B 1 ml saliva 37 Blue coloration turned into translucent green. Blue coloration turned to green and finally moderate amount of brick red precipitate suspended in solution. The solution was opaque. 2 10 ml solution B 3 M HCI 37 The blue coloured solution remains unchanged. The blue coloured solution remains unchanged. 3 10 ml solution B 3 M HCI 95 White coloured translucent suspension formed in moderate amount. A very big amount of white suspension formed which is very opaque. Turned......

Words: 321 - Pages: 2