Chemical and Physical Changes

What is the definition of a chemical change?

• A chemical change is a process in which substances remain the same with no change in properties.

• A chemical change is a process in which substances are converted into different substances with opposite properties.

• A chemical change is a process in which one or more substances are converted into different substances with different properties.

• A chemical change is a process in which substances are converted into different substances with the same properties.

Give an example of a physical change.

• Melting of ice

• Boiling water

• Burning wood

• Cutting paper

What are the indicators of a chemical change?

• Change in density

• Change in volume

• Change in texture

• Formation of a precipitate, change in color, release of gas, and absorption or release of heat

What are the properties of a physical change?

• Physical changes always result in the formation of a new substance.

• Physical changes only occur at extremely high temperatures.

• Physical changes can only occur in liquids.

• Physical changes do not change the chemical composition of a substance.

What are the phase transitions involved in physical changes?

• Melting, freezing, vaporization, condensation, sublimation, and deposition

• Evaporation, precipitation, crystallization

• Expansion, contraction, dissolution

• Solidification, liquefaction, gasification

Define chemical change.

• A chemical change is a process in which substances are converted into different substances through physical means.

• A chemical change is a process in which substances remain the same but change color.

• A chemical change is a process in which one or more substances are converted into different substances with different properties.

• A chemical change is a process in which substances are converted into different substances with the same properties.

Provide another example of a physical change.

• Boiling water

• Mixing salt and water

• Melting ice cream

• Cutting a piece of paper into smaller pieces

List three indicators of a chemical change.

• Change in state of matter

• Production of gas, formation of a precipitate, change in color or temperature

• Formation of a new element

• Change in density

Explain the properties of a physical change.

• Change in temperature

• Change in density

• Change in chemical composition

• The properties of a physical change include changes in form, state, or appearance of matter without any change in its chemical composition.

Describe the phase transitions in physical changes.

• Phase transitions in physical changes refer to the process of a substance changing from one state of matter to another, such as from solid to liquid (melting) or from liquid to gas (vaporization).

• Phase transitions in physical changes refer to the process of a substance changing from solid to energy

• Phase transitions in physical changes refer to the process of a substance changing from gas to solid

• Phase transitions in physical changes refer to the process of a substance changing from liquid to plasma