Which of the following process has the highest rate of reaction?

Antara yang berikut, proses yang manakah mempunyai kadar tindak balas

yang paling tinggi?

• Rusting

  Pengaratan

• Respiration

  Pernafasan

• Combustion

  Pembakaran

• Photosynthesis

  Fotosintesis

Which of the following is the characteristic of catalyst?

Antara yang berikut yang manakah adalah sifat mangkin?

• Catalyst used only in solid form.

  Mangkin digunakan hanya dalam bentuk pepejal.

• Catalyst increases the quantity of product.

  Mangkin meningkatkan kuantiti hasil tindak balas

• Physical state of catalyst is unchanged during reaction.

  Keadaan fizikal mangkin tidak berubah semasa tindak balas.

• The quantity of catalyst remains the same after the reaction.

  Kuantiti mangkin tetap sama selepas tindak balas.

Diagram shows the energy profile diagram of a reaction.

Rajah menunjukkan gambar rajah profil tenaga bagi suatu tindak balas.

Based on the Collision Theory, which statement explains the changing of curve I to curve II?

Berdasarkan Teori Perlanggaran, pernyataan manakah menerangkan perubahan lengkungan I kepada lengkungan II?

• The total surface area of the solid reactants increases

  Jumlah luas permukaan pepejal bahan tindak balas meningkat

• The kinetic energy of the particles of reactant decreases

  Tenaga kinetik zarah-zarah bahan tindak balas berkurangan

• The number of mole per unit volume of particles increases

  Bilangan mol per unit isipadu zarah-zarah meningkat

• The activation energy of the reaction decreases

  Tenaga pengaktifan tindak balas berkurangan

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions

• it only increases the frequency of particle collisions

• it only increases the energy of particle collisions

• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Grinding a effervescent tablet into powder increases the rate of reaction due to increased

• concentration

• surface area

• temperature

• reactants

Tags

NGSS.HS-PS1-5

Adding a catalyst ___________ the activation energy.

• Raises

• Lowers

• Doesn't affect

• Inreases

Tags

NGSS.HS-PS1-5

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-5

In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulphuric acid. The solid line on the graph shows the volume of gas given off when the 2 g lump is used. Which dotted line is obtained when the zinc is powdered? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5

A slice of meat which has been cut into smaller pieces takes a shorter time to cook if compared to a slice of meat which did not cut to smaller pieces

Sekeping daging yang dipotong kepada kepingan-kepingan kecil akan

mengambil masa yang lebih cepat untuk dimasak berbanding sekeping daging yang tidak dipotong.

Based on the above statement, choose the best explanation.

Berdasarkan pernyataan di atas, pilih penjelasan yang paling sesuai.

• The smaller the size of reactant, the higher the kinetic energy of the particles

  Lebih kecil saiz bahan tindak balas, lebih tinggi tenaga kinetik zarah- zarah.

• The smaller the size of reactant, more particles in reactant will exist

  Lebih kecil saiz bahan tindak balas, semakin banyak jumlah zarah yang wujud.

• The smaller the size of reactant, the lower activation energy needs for a reaction to occur.

  Lebih kecil saiz bahan tindak balas, lebih rendah tenaga pengaktifan yang diperlukan untuk tindak balas.

• The smaller the size of reactant, the bigger the total surface area.

  Lebih kecil saiz bahan tindak balas, lebih besar luas jumlah permukaan bahan tindak balas tersebut

The following diagrams show a reaction between liquid X and solid Y to form a gas.

Rajah-rajah berikut menunjukkan satu tindak balas di antara cecair X dan pepejal Y untuk membentuk gas.

• 1 and 3

  1 dan 3

• 1 and 4

  1 dan 4

• 2 and 3

  2 dan 3

• 2 and 4

  2 dan 4