Question

A new substance is formed in a chemical change.

• A. True
• B. False

Answer 1

The correct option is A True

Step 1 Understanding the concept:

When a substance experiences a chemical change, its molecular composition changes completely, resulting in the production of new substances.

A chemical change is accompanied by changes in the substance's physical and chemical properties, as well as its composition.

For Example, Rusting of iron, coal combustion, magnesium ribbon combustion.

Step 2 Explanation: When magnesium ribbon burns in presence of oxygen, it forms a new substance, magnesium oxide which has different physical and chemical properties than magnesium.

Thus a new substance is formed in a chemical change is a true statement.

$$\begin{gathered} 2Mg+O_2\to 2MgO \\ (Whitepowder) \end{gathered}$$