★ Must-know
📌 A chemical change alters a substance’s composition and produces a substance that is no longer the same, whereas a physical change alters energy or aggregate state without changing composition.
Further detail
Physics studies the state of substances, energy, and energy transformations, while chemistry and physics overlap because chemical reactions involve energy changes.
Heating platinum wire makes it glow and emit light without changing platinum’s characteristic properties, so the change is physical.
1. Which set of subjects falls within the scope of chemistry?
2. A material changes from a solid to a liquid while keeping the same chemical composition; how should this change be classified?
3. Which statement correctly describes mass and its standard unit of measurement?
What does chemistry study about substances and their reactions?
Their composition, properties, internal structure, changes, and reaction mechanisms.
What distinguishes a chemical change from a physical change?
A chemical change alters composition, while a physical change alters energy or aggregate state without changing composition.
What happens to a substance’s composition during a chemical change?
It changes, producing a substance that is no longer the same.
What property of matter is measured in kilograms?
Mass.
What equation relates weight force, mass, and gravitational acceleration?
According to Isak Newton, what is the gravitational force between two bodies?
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