Sains dan Alam Sekitar

Sejauh manakah kesedaran kita kepada alam sekitar. Hayati video ini.

Acids and Bases - Part 1

Definitions of acids and bases

• Arrhenius
  acid: generates [H⁺] in solution
  base: generates [OH^-] in solution
  normal Arrhenius equation: acid + base <---> salt + water
  example: HCl + NaOH <---> NaCl + H₂O 
• Bronsted-Lowery:
  acid: anything that donates a [H⁺] (proton donor)
  base: anything that accepts a [H⁺] (proton acceptor)
  normal Bronsted-Lowery equation: acid + base <---> acid + base
  example: HNO₂ + H₂O <---> NO₂^- + H₃O⁺
  Each acid has a conjugate base and each base has a conjugate acid. These conjugate pairs only differ by a proton. In this example: HNO₂ is the acid, H₂O is the base, NO₂^- is the conj. base, and H₃O⁺ is the conj. acid.
• Lewis:
  acid: accepts an electron pair
  base: donates an electron pair
  The advantage of this theory is that many more reactions can be considered acid-base reactions because they do not have to occur in solution.

nota chemistry -asid based titration

get your acid based titration

power point  slide here

Pengumuman

Dear to my Form 1 students,

Lawatan ke Galeri Sains Sabah

Pelajar-pelajar tingkatan 1 yang berminat mengikuti lawatan sambil belajar ke Galeri Sains Sabah, sila daftarkan diri anda berserta membawa duit RM10              

Pengumuman

Perhatian kepada semua pelajar tingkatan 3, kelas tambahan yang dijadualkan pada hari Sabtu ini (18/2/2012) akan ditunda ke tarikh yang akan diberitahu kelak. 

Sekian, terima kasih.

nota chemistry bab 2

Dear my beloved form 4 student, your lovely chapter 2 notes here

nota chemistry bab 1

To my form 4 class, please click here to get your first notes

Forum 1: Kepentingan sains dalam kehidupan harian

Berdasarkan paparan video, Bincangkan apakah kaitan sains dengan solat?

Tutorial Form 3

 

TOPIC     :    REPRODUCTION SYSTEM IN FLOWERING PLANT

SECTION B

1.    Diagram 1.1 shows a longitudinal section of a flower.

                                                        Figure 1.1

     (a)  State the function of the structure labeled P in Diagram 1.1.

Structure	Function
P

  [1 mark]

( b )

Diagram 1.2

(b)   Mark Diagram 1.2 with letters:

(i)            T  :  the structure that contains male gametes.

(1 mark)

(ii)           U  :  the place where fertilisation occurs.

(1 mark)

(c)   Mark using an arrow to show the movement of male gametes in the process of fertilization in  Diagram 1.2

(1 mark)

(d)   Based on your observation in Diagram 1.2:

(i)   Identify the pollinating agent that needed to transfer the pollen grain.

       __________________________________________________________

(1mark)

(ii)  Give a reason to support your answer in (d) (i)

      ___________________________________________________________

(1 mark)    

(e)   Give two reasons how cross-pollination is useful in the field of agriculture.

1.  __________________________________________________________

2.  _________________________________________________________

                                                                                                             (2 marks)

2.       Diagram 2.1 shows the different types of pollination that occurs in flowering

          plants.

                                                  P                                                        Q

                                                

 Diagram 2.1

(a)   (i)  Based on Diagram 2.1, state the types of pollination of P ?

     P  :  _____________________________________________________

(1 marks)

           (ii)  Give one reason for your answer in (a) (i).

                 __________________________________________________________

                 __________________________________________________________

(2 mark)

          (iii)  Which type of pollination is beneficial to agriculture.

                ___________________________________________________________

  (1 mark)

     (b)  (i)  Why do insects visit the flowers?

                 ___________________________________________________________

(1 mark)

           (ii)  How do the insect help in  the reproduction of plants?

                 __________________________________________________________

                 __________________________________________________________

(2 marks)

     (c)  Table 2.2 shows the characteristics of fruits by two papaya trees M and N.

           

Plant M	Plant N
Small Less Sweet Thick flesh	Big Sweet Thin Flesh

                                                 Table 2.2

            (i)  Give two characteristics of the fruit obtained from cross pollination of plant

                 M and N.

                 _________________________________________________________

                 _________________________________________________________

(2 marks)

           (ii)  Name one example other than the papaya plant that is used in the same

                 type of pollination  as mentioned in (b) (i) above.

                 _________________________________________________________

                 (1 mark)

ANNOUNCEMENT

Dear my beloved students Form 4S...


    Please make sure that you've already finish your homework. It'll discuss on our next class this Monday.


   Hopefully all notes properly done and well prepared for any pop quiz that'll be held anytime during the class.

          TQ.