The process by which a substance becomes a different substance?

The process by which a substance becomes a different substance?

• A. Physical property
• B. Chemical change
• C. Physical change
• D. Chemical property

Answer: (B)

A chemical change is when a substance becomes a different substance. This happens because the bonds between atoms break and new bonds form, creating substances with new properties. You can tell a chemical change is occurring when you see signs like a color change, the production of gas, a precipitate forming, or an accompanying energy change (felt as heat or cold). For example, rust forming on iron or burning wood both produce new materials rather than just altering how the original material looks or feels. By contrast, a physical change keeps the same substance; it just changes form or appearance, like ice melting or paper tearing. Physical properties describe how a material behaves without changing what it is, while chemical properties describe how it reacts to form new substances.

A chemical change is when a substance becomes a different substance. This happens because the bonds between atoms break and new bonds form, creating substances with new properties. You can tell a chemical change is occurring when you see signs like a color change, the production of gas, a precipitate forming, or an accompanying energy change (felt as heat or cold). For example, rust forming on iron or burning wood both produce new materials rather than just altering how the original material looks or feels.

By contrast, a physical change keeps the same substance; it just changes form or appearance, like ice melting or paper tearing. Physical properties describe how a material behaves without changing what it is, while chemical properties describe how it reacts to form new substances.