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ปัญหา 1
เลือกประเภท
Which of the following is an example of a physical change?
- Burning wood
- Baking a cake
- Dissolving sugar in water
- Rusting of iron
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มัธยมต้น 7
วิทยาศาสตร์
Physical & Chemical Change
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ปัญหา 2
เลือกประเภท
What is a key indicator that a chemical change has occurred?
- The substance changes shape.
- The substance changes state (e.g., solid to liquid).
- A new substance with different properties is formed.
- The substance gets smaller.
ปัญหา 3
เลือกประเภท
When an ice cube melts into water, this is a:
- Chemical change because it looks different.
- Physical change because it's still water (H₂O).
- Chemical change because heat was added.
- Physical change because a gas is produced.
ปัญหา 4
เลือกประเภท
Which of these is a sign of a chemical change?
- A puddle of water evaporating.
- A piece of paper being torn.
- Milk turning sour.
- A glass breaking.
ปัญหา 5
เลือกประเภท
Grinding a piece of chalk into powder is an example of a:
- Chemical change
- Physical change
- Change in state
- Formation of a new substance
ปัญหา 6
เลือกประเภท
When you light a match, the burning of the matchstick is primarily a:
- Physical change, because the match gets smaller.
- Chemical change, because light and smoke are produced.
- Physical change, because the ash looks similar to wood.
- Both a physical and chemical change with no clear primary.
ปัญหา 7
เลือกประเภท
Which of the following actions will not result in a chemical change?
- Digesting food
- Photosynthesis in plants
- Mixing sand and water
- An explosion of fireworks
ปัญหา 8
เลือกประเภท
What happens to the particles of a substance during a physical change?
- The particles themselves change into new types of particles.
- The arrangement of the particles changes, but the particles themselves stay the same.
- The particles are destroyed.
- New particles are created from nothing.
ปัญหา 9
เลือกประเภท
When iron reacts with oxygen to form rust, this is a chemical change because:
- The iron changes color.
- The iron becomes weaker.
- Rust is a new substance with different properties than iron or oxygen.
- The iron gets wet.
ปัญหา 10
เลือกประเภท
Which statement best describes the difference between physical and chemical changes?
- Physical changes are always reversible, while chemical changes are not.
- Chemical changes always involve a change in state, while physical changes do not.
- Physical changes alter the form of a substance but not its chemical identity; chemical changes result in new substances.
- Chemical changes are always more dramatic than physical changes.
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