Physical or Chemical Change/Phases
Flashcard
•
Chemistry
•
8th Grade - University
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling), shape, or size.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the breaking and forming of bonds. Examples include rusting of iron and burning of wood.
3.
FLASHCARD QUESTION
Front
What happens to the temperature of water during a phase change?
Back
The temperature of water remains constant during a phase change, even when heat is added. This is because the energy is used to change the state of the water rather than increase its temperature.
4.
FLASHCARD QUESTION
Front
What is an example of a physical change involving water?
Back
Boiling water is an example of a physical change, as it changes from liquid to gas without altering its chemical composition.
5.
FLASHCARD QUESTION
Front
What is an example of a chemical change involving water?
Back
The decomposition of water (H2O) into hydrogen (H2) and oxygen (O2) is a chemical change, as it results in the formation of new substances.
6.
FLASHCARD QUESTION
Front
What occurs when salt is dissolved in water?
Back
When salt is dissolved in water, it undergoes a physical change. The salt dissociates into its ions, but no new substances are formed.
7.
FLASHCARD QUESTION
Front
What is the effect of adding heat to a solid?
Back
Adding heat to a solid can cause it to melt and change into a liquid, which is a physical change.
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