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

Option (E) is the correct answer.

Explanation:

A property which brings change in chemical composition of a substance is known as chemical property.

For example, reactivity, acidic nature etc are chemical properties.

Whereas when there occurs no change in chemical composition of a substance then it is known as physical property.

For example, mass, density, melting point are all physical properties.

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

is a chemical property.

A characteristic feature of any substance that makes it different from the others is known as property.

Types of properties:

1. Physical properties

These are the properties that are measured without changing the chemical composition of the matter. These are used to describe and observe and matter. These can also be classified as physical and chemical properties, varying on their dependence. Some examples of physical properties are mass, volume, density, melting and boiling points.

2. Chemical properties:

These are the properties that come into account when any chemical reaction takes place. These cannot be observed by simple viewing or touching the substance. Some examples of chemical properties are toxicity, flammability, enthalpy of combustion, and chemical reactivity.

A. Density is defined as mass per unit volume. It can be measured without altering the chemical composition of matter so it is a physical property.

B. Melting point can be measured without altering the chemical composition of matter so it is a physical property.

C. Electrical Conductance is a physical property as it can be measured without changing the chemical composition of matter.

D. Color can be observed simply by just looking at the substance so it is a physical property.

E. When magnesium is exposed to heat, it burns and some new substances will be formed with the help of chemical reaction. The chemical composition of magnesium is changed so it is a chemical property.

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Answer details:

Grade: High School

Chapter: Physical and chemical properties

Subject: Chemistry

Keywords: chemical property, physical property, color, density, electrical conductance, heat, chemical composition, matter.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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