Which type of change in matter produces one or more new substances?

Which type of change in matter produces one or more new substances?

• A. Physical change
• B. Chemical change
• C. Biological change
• D. Mechanical change

Answer: (B)

A chemical change is characterized by the transformation of one or more substances into entirely new substances that possess different properties. This occurs when chemical bonds are broken and formed, leading to a reconfiguration of atoms. For example, when iron rusts, it reacts with oxygen to form iron oxide, a completely different substance. In contrast, physical changes do not alter the chemical composition of a substance. They may involve changes in state, appearance, or temperature, but the substance remains the same at the molecular level. Examples include melting ice or dissolving sugar in water. Biological change pertains specifically to processes involving living organisms, which can encompass both physical and chemical changes occurring within biological systems. Mechanical changes involve the physical manipulation of materials or objects, which also do not result in the formation of new substances. Examples include cutting, grinding, or reshaping materials. Thus, a chemical change is distinctly recognized for producing new substances, making it the correct choice.

A chemical change is characterized by the transformation of one or more substances into entirely new substances that possess different properties. This occurs when chemical bonds are broken and formed, leading to a reconfiguration of atoms. For example, when iron rusts, it reacts with oxygen to form iron oxide, a completely different substance.

In contrast, physical changes do not alter the chemical composition of a substance. They may involve changes in state, appearance, or temperature, but the substance remains the same at the molecular level. Examples include melting ice or dissolving sugar in water.

Biological change pertains specifically to processes involving living organisms, which can encompass both physical and chemical changes occurring within biological systems.

Mechanical changes involve the physical manipulation of materials or objects, which also do not result in the formation of new substances. Examples include cutting, grinding, or reshaping materials.

Thus, a chemical change is distinctly recognized for producing new substances, making it the correct choice.