Which of these properties is a chemical property flammability magnesium melting point hardiness

Flammability is a chemical property.

Out of the properties listed, flammability is a chemical property.

Flammability is the chemical property among the options you provided (flammability, magnesium melting point, and hardiness). To determine this, one can consider the definition of a chemical property.

Chemical properties describe how a substance interacts with other substances, indicating how it can undergo chemical reactions or change in composition. Flammability refers to the ability of a substance to undergo combustion when exposed to a source of ignition, such as heat, flame, or sparks.

To determine the flammability of a substance like magnesium, one can perform experimental tests. These tests involve exposing a small sample of the substance to an ignition source and observing whether it ignites or undergoes combustion. In the case of magnesium, it is well-known for its high flammability, meaning it readily catches fire and burns when exposed to sufficient heat or flame.

In contrast, the melting point is a physical property, indicating the temperature at which a substance changes from a solid to a liquid state. Hardiness is not a specific property commonly mentioned in relation to substances, so it is difficult to determine what it refers to without additional context.