Form 3 Science Chapter 4-6

Which of the following exists as a natural compound in the Earth's crust?

• Gold

• Tin

• Marble

• Diamond

Hematite is a natural compound for _______ oxide.

• Iron

• Aluminium

• Calcium

• Zinc

Which of the following metal oxides does not react with carbon?

• Zinc oxide

• Copper oxide

• Ferum oxide

• Aluminium oxide

Which of the following is not the consequences of unplanned mining activities on the environment?

• The carbon cycle remains balanced even after logging activities.

• The extinction of endemic species

• Deposition of silt often cause flash floods in surrounding area

• Transmission of infectious diseases due to improper drainage system.

Which of the following describes exothermic reaction?

• The container becomes cold

• The temperature dropped

• Heat energy is released

• The concentration of chemical substances increases

What type of reaction occurs in the diagram above?

• Neutralisation

• Crystallisation

• Exothermic

• Endothermic

Which of the following statement is true about endothermic reaction?

• Heat releases to the surrounding

• More energy is required

• The temperature of the surrounding is lower than the temperature of reaction

• The temperature of the surrounding is higher than the temperature of the reaction

Which of the following reaction is an example of endothermic reaction?

• Rusting

• Nuclear fission

• Neutralisation of acid and alkali

• Photosynthesis

In every chemical reaction, the temperature of the reactants will become the same as the surrounding temperature when ___________ achieved.

• Thermal equilibrium

• Final point

• Dynamic equilibrium

• Ecosystem balance

Which of the following are the examples of exothermic reaction?

I Bomb explosion

II Respiration

III Photosynthesis

IV Melting of ice

• I and II

• I and III

• II and IV

• III and IV