Sci3nc3 iN mY WoRld

Friday, 19 October 2012

Peka Sains Year 5

Date

20-7-2012

Activity Code

5 /2 / 2.1 / 1

Theme

Investigating Materials

Topic

2. Acid and Alkaline

Learning Outcomes

4.1.1 Pupils identify acidic, alkaline and
neutral substances using litmus paper.

Aim

To investigate the relationship between
the type of solution and the change of
blue and red litmus paper

Apparatus

Solution P(mineral water), solution Q
(salt water), solution R (vinegar),
solution S (panadol solution),

solution T (toothpaste) and
solution U (lime juice)，blue litmus
paper and red litmus paper,beakers
and petri dishes

Method

1. Pour small amaunt of solutions given
in the petri dish.

2. Taste all solutions P,Q,R,S,T and U.
Record your observation.

3.      Then dip a red litmus paper in the
      solution P and observe the colour
      changed.

4. Then use blue litmus paper and
observe the colour change.

5. Record your finding in the table below.

6. Repeat the above activity using solutions
Q,R,S,T and U.

Observation

Solutions	Observations
Solutions	Red litmus paper	Blue litmus paper
P (Mineral water )	Does not change colour	Does not change colour
Q (Salt)	Does not change colour	Does not change colour
R (Vinegar)	Does not change colour	Turn to red
S (Panadol Solution)	Turn to blue	Does not change colour
T (Tooth paste)	Turn to blue	Does not change colour
U (Lime juice)	Does not change colour	Turn to red

Discussion

1. Group the solutions above correctly.

Acidic

Solution R

Solution U

Alkaline

Solution S

Solution T

Neutral

Solution P

Solution Q

2. Which solution have a same properties as a detergent?

Solution S and T

Predict how do the colour of blue and red litmus paper changed

if we test the lemon juice.

Blue litmus paper will change to red and the red litmus paper

does not change its colour.

Conclusion : Acidic substances change the colour of blue litmus paper

to red/ Alkaline substances change the colour of red litmus paper

to blue/ Neutral substances do not change the colour of red or

blue litmus paper.

Thursday, 18 October 2012

Peka Sains Year 6

Date

15-4-2012

Activity Code

6 / 3 / 1.2 / 2

Theme

Investigating Materials

Topic

1 Food Preservation

Learning Outcomes

1.2 Sythesizing the concept of food
preservation

Aim

To collect and display examples of
food using drying method

Method

1. Work in groups to collect
5 dried food specimens.

2. Put each type of specimens
in separate transparent
plastic sachet.

3. Seal each sachet.

4. Paste and label the samples
on the manila card.

5. Present and display the
chart to the class.

Observation

1. List the specimens that you have collected.

	Dried Food
1.	Dried Chilies
2.	Dried Banana
3.	Dried Mango
4.	Fish Crackers
5.	Squid

Discussion

1. What is the condition of the specimens?

Dry, water-free, light .

2. What will happen if the specimens are not dried?

The food will turn bad.

3. Give reason why the dried food will not turns bad?

Microorganism cannot grow in
a water-free environment.

4. What is the conditions for microorganisms to grow?

Microorganisms need air, suitable acidity and
temperature to grow.

Conclusion   :    Microorganisms cannot grow in a
                         water-free environment therefore
                        drying can preserve the food and
                        make the food last longer.