REVISION SCIENCE FORM 2 (CHAPTER 6)

What is the properties of acid based on the activities below?

Apakah ciri bagi sifat asid berdasarkan aktiviti di bawah?

• Acid tastes sour.

  Asid mempunyai rasa masam.

• Acid is corrosive.

  Asid bersifat mengakis.

• Acid has a pH value lower than 7.

  Asid mempunyai nilai pH kurang daripada 7.

• Hydrogen gas is released when an acid reacts with a metal.

  Gas hidrogen terbebas apabila asid bertindak balas dengan logam.

The following shows general equation of reaction between metal and acid.

zinc + hydrochloric acid > ?

Yang berikut merupakan persamaan umum tentang tindak balas logam dan asid.

zink + asid hidroklorik > ?

• zinc hydrochloric/zink hidroklorik + hydrogen/hidrogen

• zinc chloric/zink klorik + hydrogen/hidrogen

• zinc chloride/zink klorida + hydrogen/hidrogen

Mark TWO fruits that have acidic properties.

Tandakan DUA buah yang bersifat asid.

• pineapple/nanas

• starfruit/belimbing

• bitter gourd/peria

State the relationship between the strength of acids and alkalis and pH values.

Nyatakan perkaitan antara kekuatan asid dan alkali dengan nilai pH.

• The stronger an acid, the smaller its pH value, while the stronger an alkali, the smaller its pH value.

  Semakin kuat suatu asid, semakin kecil nilai pH manakala semakin kuat suatu alkali, semakin kecil nilai pH.

• The stronger an acid, the greater its pH value, while the stronger an alkali, the greater its pH value.

  Semakin kuat suatu asid, semakin besar nilai pH manakala semakin kuat suatu alkali, semakin besar nilai pH.

• The stronger an acid, the smaller its pH value, while the stronger an alkali, the greater its pH value.

  Semakin kuat suatu asid, semakin kecil nilai pH manakala semakin kuat suatu alkali, semakin besar nilai pH.

What can be observed on the red litmus paper?

Apakah yang dapat diperhatikan pada kertas litmus merah?

• Red litmus paper change to blue

  Kertas litmus merah bertukar biru

• No change

  Tiada perubahan

Name the process that takes place when an acid reacts with an alkali.

Namakan proses yang berlaku apabila asid bertindak balas dengan alkali.

• neutralisation/peneutralan

• filtration/penapisan

• flotation/pengapungan

• titration/pentitratan

Predict the colour change at the end point (neutral point) of the phenolphthalein.

Ramalkan perubahan warna pada takat akhir (takat neutral) fenolftalein.

• colourless/tidak berwarna > pink/merah jambu

• purple/ungu > green/hijau

• pink/merah jambu > colourless/tidak berwarna

• green/hijau > purple/ungu

What is the volume of hydrochloric acid required to neutralise 25 ml of sodium hydroxide solution?

Berapakah isi padu asid hidroklorik yang diperlukan untuk meneutralkan 25 ml larutan natrium hidroksida?

• 15 ml

• 25 ml

• 30 ml

• 50 ml

What will happen if the solution in the conical flask is heated until all the water are evaporated?

Apakah yang akan terbentuk sekiranya larutan di dalam kelalang kon dipanaskan sehingga semua air tersejat?

• pink powder is produced/serbuk merah jambu terhasil.

• white powder is produced/serbuk putih terhasil.

Predict the taste for the powder formed.

Ramalkan rasa bagi serbuk yang terbentuk.

• sweet/manis

• sour/masam

• salty/masin

• bitter/pahit