chemical
"Very reactive" is a chemical property because it describes how likely a substance is to undergo a chemical reaction with other substances. It does not pertain to any physical characteristic of the substance.
Reactivity is a chemical property, not a change.
As with most fluorides, it is extremely reactive.
Cesium is the most chemically reactive metal.
Alkali metals are very reactive.
The reaction of sodium with water is a chemical property because it involves a chemical change where new substances are formed (sodium hydroxide and hydrogen gas) with different properties compared to the original substances (sodium and water). Physical properties, on the other hand, are characteristics of a substance that can be observed without changing its chemical composition.
It is very reactive.
The reactivity of potassium in fireworks is a chemical property. This property describes how potassium interacts with other substances, such as oxygen, during combustion, resulting in a chemical reaction that produces light and sound. Physical properties, on the other hand, pertain to characteristics that do not change the substance's chemical identity, such as color or melting point. Therefore, potassium's reactivity is classified as a chemical property.
Chlorine is a very reactive non-metal. It readily combines with other elements to form compounds and is highly electronegative, meaning it has a strong tendency to gain electrons in chemical reactions.
Reactivity is the property that describes how readily a substance combines chemically with other substances. Reactivity is also referred to as the rate at which a chemical substance tends to undergo a chemical reaction.
Sodium is a very reactive chemical element.
Chemical and physical properties