Which statement best describes chemical properties of matter?
a)chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
b)chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
c)chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.
d)chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

Option (C) is the correct answer.

Explanation:

A property that changes chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

A chemical property or reaction will always lead to the formation of a new product.

So, chemical properties such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

On the other hand, a property that does not bring any change in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, etc of a substance are all physical properties.

Thus, we can conclude that the statement chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form, best describes chemical properties of matter.

asking the goog might u get an answer

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).