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Thursday, February 23, 2017

Last Blog in M.5

This year was my favourite year because Kru Gary taught us Biology and Chemistry clearly. You made me understand and love Biology and Chemistry. I really like ice cream lab so much because we learn how to make our own flavour of ice cream by yourself.

Titration Lab

Apparatus : 1) Beaker
                   2) Pipette
                   3) Funnel
                   4) Burette
                   5) Phenolphthalein indicator
                   6) Flask
                   7) Clamp stand
Methods : 
1. Set up the clamp stand, Burette, Flask, and Beaker.
2. Pour the 50 cm of alkali into the burette and tighten the valve.
3. Pour 10 cm of acid into the beaker, then mix it with the phenolphthalein indicator.
4. Pour the acid until the indicator turns pink, record the volume.
5. Repeat different concentration of acid samples.

Sunday, February 19, 2017

Leaf Test

Apparatus
                 1. 2 Leaves
                 2. Test tube
                 3. Tweezer
                 4. Tripod
                 5. Beaker
                 6. Pipet
                 7. Iodine
                 8. Bunzen Burner
                 9. Flake and Clamp stand

Methods
1) Set up the flake and clamp stand. Add 100 ml of water in the beaker and then boil it

2) Add 2 Leaves into the beaker which has the boiled water and wait for 1-2 minutes

3) Then Kru Gary will add the ethanol into the test tube.

4) Put the leaves into the test tube


5) Put the test tube in the beaker with boiled water and wait until the ethanol turn green.


6) Keep the leaves out from the test tube and lay on the paper

7) Drop the iodine around 1-3 drops and observe


Questions
1) Why do we boil the leaves?
Ans To get rid of the cuticle

2)What the leaves texture like after boiling?
Ans

3)Why do we use ethanol on the leaf after boiling?
Ans

4)What is the color of the water after boiling the leaf?  why?  Why did some people get pink brown water?
Ans

5)When you test for starch with the iodine, why does the paper turn black?
Ans

6)What happens to the iodine test on the unboiled leaf?  why?
Ans

Thursday, February 2, 2017

Plant Lab

1. You find a plant that has leaves with parallel venation. Considering what you know, what type of root system would you expect this plant to have? Also, how many petals would you expect to find on the flowers?

Ans The leaf with parallel venation will be a monocot which have a fibrous root and 3 factors of petal.

2. What structure do you look for at the base of the petiole to help determine if a leaf is simple or compound?

Ans  Simple : no separate part at the base of petiole 
         Compound : many tiny leaves in one leaf

3.What two vascular tissues are located within the vein? What does each transport?
Ans Phloem : Food
       Xylem : Water and Minerals

4.What is the primary function of the leaf?
Ans Photosynthesis and Transpiration








Plant Graft :)



Materials
1.Clay
2.Scissors 
3.Scalpel 
4.rope
Procedure
1. Cut the node of the stem
2. put the node of the first plant into another plant
3. Attach them together by the clay
4. Observe

Question
1. Please discuss why KK/Boss/Mobiles' plant graft worked while others failed.Ans The others may bind the node too tight so that can damage the plant.

2. What do you think are three keys to a successful graft
Ans 2.1 Water
        2.2 How tight of the clay
        2.3 Mineral


Thursday, December 1, 2016

Bunsen Burner Lab Question :))

Question

1.) Table and graph of the temperature of both beaker before start boiling.


Time taken (Minutes)
Water (Degree Celcius)
Salt solution (Degree Celcius)
0
6
11
1
6
10
2
5
9
3
4.5
9
Time taken (Minutes)Water (Degree Celcius)Salt solution (Degree Celcius)
04.59
1107
21728
32640
43255
54166
64974
75381
86686
97490
108197
118698
1291
1396
1496
1596
1696
1797
1897
1997
2097
2197

2) Why did your graph not quite start at 0 C?
Ans Because the temperature of ice are combined with water.

3) Where there any level sections in your graph? Why did they occur?
Ans Yes, because they change the state from liquid to gas and the temperature is not changed.

4) Imagine you were able to capture all the steam produced when the water evaporated and measure its temperature as you continued to heat it. What do you think the temperature graph would look like?
Ans The graph will continue increasing until they reach the saturate point