Melting Points of Common Materials

Canola oil is primarily composed of unsaturated fats, which have lower melting points compared to saturated fats. The melting point of canola oil is around 14°C, meaning it remains liquid at room temperature and solidifies at lower temperatures. This characteristic is important for its culinary uses and stability in cooking applications. The other options provided are significantly higher than the actual melting point of canola oil, making 14°C the accurate choice.

Butter has a melting point range of 32–35°C due to its composition of fats, primarily saturated and unsaturated fatty acids. At room temperature, butter remains solid but begins to melt when exposed to heat, transitioning from a solid to a liquid state within this temperature range. This characteristic is what gives butter its creamy texture and ability to blend well in cooking and baking, making it a versatile ingredient in various culinary applications.

Gold has a high melting point due to its metallic bonding, which involves a strong attraction between the positively charged gold ions and the sea of delocalized electrons. This strong bond requires significant energy to overcome, resulting in a melting point of 1945°C. This characteristic makes gold suitable for various applications, including jewelry and electronics, where durability and resistance to heat are essential. The other temperature options provided are far below the actual melting point of gold, highlighting its unique properties among metals.

Iron has the highest melting point among the materials listed due to its strong metallic bonds, which require a significant amount of energy to break. This characteristic is a result of iron's atomic structure, where densely packed atoms create robust interactions, leading to higher thermal stability compared to the other substances mentioned, such as butter, pure gold, and canola oil, which have lower melting points due to their different molecular structures and bonding.

Iron has a high melting point of 2802°C due to its strong metallic bonds, which result from the close packing of iron atoms and the presence of delocalized electrons. This structure requires a significant amount of energy to break the bonds during the melting process. The high melting point is characteristic of metals, particularly transition metals like iron, which exhibit robust interatomic interactions, contributing to their stability and strength at elevated temperatures.

Butter melts at a temperature of around 30 to 35 degrees Celsius, while pure gold has a melting point of approximately 1,064 degrees Celsius. This significant difference indicates that butter melts at a much lower temperature compared to pure gold. Therefore, the statement that butter melts at a higher temperature than pure gold is false.

Canola oil and butter are both fats that remain in a liquid state at room temperature, which is typically around 20-25°C. Canola oil is a vegetable oil that is liquid at room temperature, while butter, though solid when refrigerated, can soften and become spreadable at temperatures above 30°C. In contrast, pure gold and iron are metals that are solid at room temperature. Thus, canola oil and butter are the only materials listed that would be in a liquid state at 37°C.