T2V T5 C5 Carbon Compounds

Front

Which of the following is an organic carbon compound? Sucrose, Lime Stone, Diamond, Carbon dioxide

Back

Which of the following is an organic carbon 有机碳compound化合物? Sucrose蔗糖, Lime Stone石灰石, Diamond钻石, Carbon dioxide二氧化碳

Answer 答案： Sucrose

Front

What is process P in the carbon cycle?

Back

Decomposition 分解

Front

Which of the following is a saturated hydrocarbon? Ethane, Ethena, Ethanol, Ethanoic acid

Back

Answer explanation

The correct answer is: A. Ethane

Explanation:

• Saturated hydrocarbons are hydrocarbons that contain only single bonds between carbon atoms. These are also known as alkanes.

• Ethane (C₂H₆) is a saturated hydrocarbon because it contains only single bonds between carbon atoms.

Why not the others?

1. Ethanol (C₂H₅OH):

   • This is an alcohol, not a hydrocarbon.

2. Ethene (C₂H₄):

   • This is an unsaturated hydrocarbon because it contains a double bond between carbon atoms.

3. Ethanoic acid (CH₃COOH):

   • This is a carboxylic acid, not a hydrocarbon.

Front

Which food, when taken in excess, can cause the deposition of substance X on the artery wall?

Back

Beef

Answer explanation

Explanation:

• Substance X refers to deposits like cholesterol or fats that can accumulate on the walls of arteries, leading to atherosclerosis. These deposits are often caused by excessive consumption of saturated fats and cholesterol-rich foods.

• Beef contains a high level of saturated fats compared to the other options. When consumed in excess, it can raise LDL (bad cholesterol) levels, contributing to fatty deposits on arterial walls.

Front

What is the final product of process X?

Back

Ethanol and carbon dioxide

Answer explanation

Process X likely refers to fermentation, which is a biological process where sugars (e.g., glucose) are converted into ethanol and carbon dioxide by the action of yeast or certain bacteria.

Front

Physical properties of ethanol?

Back

Dissolve in water

Answer explanation

Ethanol (C₂H₅OH) has several notable physical properties, and one of the most significant is its ability to dissolve in water. This is due to the polar hydroxyl (-OH) group in ethanol, which forms hydrogen bonds with water molecules.

Why not the others?

1. A. Berwarna putih (White in color):

   • Ethanol is a colorless liquid, not white.

2. B. Gas pada suhu bilik (Gaseous at room temperature):

   • Ethanol is a liquid at room temperature, with a boiling point of 78.37°C.

3. C. Mempunyai takat didih yang tinggi (Has high boiling point):

   • Ethanol’s boiling point is moderate compared to water, not considered "high." For comparison, water boils at 100°C, which is higher than ethanol.

Front

What is X in the chemical reaction shown in the word equation?

Back

Pottasium hydoxide

Answer explanation

The reaction described in the word equation is saponification. Saponification is the process where a fat or oil (like palm oil) reacts with a strong alkali (base) to produce glycerol and fatty acid salts (commonly known as soap).

The equation is as follows:

Fat/Oil+Strong base (e.g., KOH or NaOH)→Glycerol+Soap (Fatty acid salt)

Front

Which of the following is correct about X gas?

• It can be used to generate electricity.
• It can reduce the greenhouse effect.
• It is an alkene compound.
• It has high boiling point.

Back

methane gas : It can be used to generate electricity.

Answer explanation

Biomass Methane refers to methane produced from organic matter through the process of anaerobic digestion. This process breaks down biomass—like agricultural waste, manure, food scraps, or sewage—into biogas, which primarily consists of methane (CH₄) and carbon dioxide (CO₂).

Front

Which of the following is a renewable energy resource? Natural gas, Coal, Geothermal, Petroleum

Back

Geothermal

Front

Diagram 5 shows an organic carbon compound. What is the compound?

Back

Butene

Answer explanation

The structural formula shown in the image is a representation of 2-butene,

Key Features:

1. Molecular Formula: C₄H₈

2. Functional Group: The compound has a carbon-carbon double bond (C=C), making it an alkene.