Question

plz help im in test
Several properties of the element magnesium are shown. Which one is a chemical property?
A.
has a density of 1.7 g/cm3
B.
melts at 650°C
C.
conducts electricity
D.
has a silvery-white color
E.
burns when exposed to heat

Answer 1

Answer:

E. Burns when exposed to heat.

Explanation:

A chemical property is a property in which a chemical reaction must occur to know. The rest of the options are physical properties because they do not require a chemical reaction to take place to know.

Answer 2

Answer: Option (E) is the correct answer.

Explanation:

Properties which are unable to bring any change in chemical composition of a substance are known as physical properties.

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

Whereas properties that bring change in chemical composition of a substance are known as chemical properties.

For example, reactivity, toxicity, combustion etc are all chemical properties.

So, when magnesium burns when exposed to heat then it shows its reactivity. Hence, it is a chemical property.

Thus, we can conclude that out of the given options burns when exposed to heat is a chemical property of magnesium.