SCIENCE FORM 5 CHAP 4

Which reaction has the highest rate of reaction?

Tindak balas yang manakah mempunyai kadar tindak balas yang paling tinggi?

• rusting of iron fence

  pengaratan pagar besi

• burning of candle

  pembakaran lilin

• photosynthesis in green plants

  fotosintesis dalam tumbuhan hijau

• digestion of protein

  pencernaan protein

Which reaction has the lowest rate of reaction?

Tindak balas yang manakah mempunyai kadar tindak balas yang paling rendah?

• combustion of small pieces of charcoal in air

  pembakaran ketulan kecil arang kayu dalam udara

• reaction between dilute hydrochloric acid

  tindak balas antara asid hidroklorik cair dengan larutan natrium hidroksida

• formation of stalactite and stalagmite

  pembentukan stalaktit dan stalagmit

• dissolving of sodium in water

  pelarutan natrium dalam air

Which unit is used to measure rate of reaction?

Unit yang manakah digunakan untuk mengukur kadar tindak balas?

• g mol^-1

• mol g^-1

• mol s^-1

• mol dm^-3

0.5 mol of zinc powder reacts with excess dilute hydchloric acid.After 20s,0.3 mol of zinc is left.What is the average rate of this reaction?

0.5 mol serbuk zink bertindak balas dengan asid hidroklorik cair berlebihan.Selepas 20s,didapati 0.3 mol zink tertinggal sebagai baki.Berapakah kadar purata bagi tindak balas ini?

• 0.2 mol s^-1

• 0.1 mol s^-1

• 0.02 mol s^-1

• 0.01 mol s^-1

What is the meaning of rate of reaction?

Apakah maksud kadar tindak balas?

• increase in quantity of reactants

  peningkatan kuantiti bahan tindak balas

• increase in quantity of reactants with time

  peningkatan kuantiti bahan tindak balas dengan masa

• increase in quantity of products of reaction

  peningkatan kuantiti hasil tindak balas

• increase in quantity of products of reaction with time

  peningkatan kuantiti hasil tindak balas dengan masa

What is the yellow precipitate formed when sodium thiosulphate solution reacts with dilute sulphuric acid?

Apakah mendakan kuning yang terbentuk apabila larutan natrium tiosulfat bertindak balas dengan asid sulfurik cair?

• sodium

  natrium

• sulphur

  sulfur

• sodium sulphate

  natrium sulfat

• sulphur dioxide

  sulfur dioksida

Which of the following factors affect the rate of reaction,involving reactants in gaseous form only?

Antara faktor yang mempengaruhi kadar tindak balas berikut,yang manakah melibatkan bahan tindak balas berbentuk gas sahaja?

• pressure

  tekanan

• temperature

  suhu

• concentration of reactants

  kepekatan bahan tindak balas

• use of catalyst

  penggunaan mangkin

How can the rate of food spoilage be reduced by keeping food in the refrigerator?

Bagaimanakah kadar kerosakan suatu makanan dapat dikurangkan dengan menyimpan makanan tersebut di dalam peti sejuk?

• reduction of oxygen

  pengurangan oksigen

• drop in temperature

  penurunan suhu

• absence of light

  ketiadaan cahaya

• absence of catalyst

  ketiadaan mangkin

Which product of reaction is produced in the Haber process?

Hasil tindak balas yang manakah dihasilkan dalam proses Haber?

• nitrogen

• hydrogen

  hidrogen

• nitric acid

  asid nitrik

• ammonia

What is used as a catalyst in the Contact process?

Apakah mangkin yang digunakan dalam proses Sentuh?

• iron fillings

  serbuk besi

• vanadium (V) oxide

  vanadium (V) oksida

• sulphur

  sulfur

• water

  air