The process by which substances are changed into different substances with different properties is called what?

The process by which substances are changed into different substances with different properties is called what?

• A. Phase Change
• B. Reversible Change
• C. Physical Change
• D. Chemical Change

Answer: (D)

This is about when a substance becomes a different substance with new properties. A chemical change happens when bonds between atoms break and new bonds form, giving materials with a different composition and characteristics such as color, odor, reactivity, or texture. You can spot chemical changes by signs like a color change that sticks, gas bubbles forming, a solid precipitating, or an energy change (heat or light) that isn’t just a physical warming or cooling. Physical changes, including phase changes, involve changes in state or appearance without creating a new substance—the same material remains the same chemically. Phase changes are a type of physical change where, for example, ice becomes water or water becomes steam, but the chemical identity stays the same. The term “reversible change” isn’t a defining feature here, since some chemical changes can be reversed and some physical changes are not easily reversible. So the process described—creating a substance with different properties by forming new substances—is a chemical change.

This is about when a substance becomes a different substance with new properties. A chemical change happens when bonds between atoms break and new bonds form, giving materials with a different composition and characteristics such as color, odor, reactivity, or texture. You can spot chemical changes by signs like a color change that sticks, gas bubbles forming, a solid precipitating, or an energy change (heat or light) that isn’t just a physical warming or cooling.

Physical changes, including phase changes, involve changes in state or appearance without creating a new substance—the same material remains the same chemically. Phase changes are a type of physical change where, for example, ice becomes water or water becomes steam, but the chemical identity stays the same. The term “reversible change” isn’t a defining feature here, since some chemical changes can be reversed and some physical changes are not easily reversible.

So the process described—creating a substance with different properties by forming new substances—is a chemical change.