Match the following scnarios to physical or chemical changes.
Column A
1.
cutting paper:
cutting paper
2.
rusting bike:
rusting bike
3.
spoiling milk:
spoiling milk
4.
boiling water:
boiling water
5.
breaking glass:
breaking glass
6.
popping popcorn:
popping popcorn
7.
burning wood:
burning wood
8.
breaking an egg:
breaking an egg
Column B
a.chemical change
b.physical change
1. b.physical change
2. a.chemical change
3. a.chemical change
4. b.physical change
5. b.physical change
6. a.chemical change
7. a.chemical change
8. b.physical change
Column A Column B
1. cutting paper: b. physical change
2. rusting bike: a. chemical change
3. spoiling milk: a. chemical change
4. boiling water: b. physical change
5. breaking glass: b. physical change
6. popping popcorn: b. physical change
7. burning wood: a. chemical change
8. breaking an egg: b. physical change
To match the scenarios to physical or chemical changes, we need to understand the difference between these types of changes.
Physical changes involve a change in the appearance or form of a substance without creating a new substance. Examples of physical changes include changes in size, shape, state of matter (solid, liquid, gas), or dissolving.
Chemical changes, on the other hand, involve the formation of new substances with different properties. These changes are often irreversible. Examples of chemical changes include burning, rusting, or decomposition.
Now, let's match the scenarios from Column A to their corresponding change types in Column B:
1. cutting paper: physical change (b)
When we cut paper, the substance maintains its chemical composition. It is only the physical form of the paper that is altered.
2. rusting bike: chemical change (a)
Rusting involves a chemical reaction between iron in the bike and oxygen in the air, resulting in the formation of iron oxide (rust), which is a different substance from the original metal.
3. spoiling milk: chemical change (a)
Spoiling milk is caused by the growth of microorganisms (bacteria, fungi) that break down the milk's components, leading to the formation of new substances with different properties.
4. boiling water: physical change (b)
Boiling water is a physical change because it only causes a change in the state of matter, from a liquid to a gas, without altering the chemical composition of water.
5. breaking glass: physical change (b)
Breaking glass is a physical change since the chemical structure of glass remains the same. Though the shape changes, no new substances are formed.
6. popping popcorn: physical change (b)
Popping popcorn involves the conversion of kernel water to steam, resulting in the rapid expansion of the internal moisture and starch. It is considered a physical change as no new substances are formed.
7. burning wood: chemical change (a)
Burning wood is a chemical change because it involves a combustion reaction. The wood reacts with oxygen, releasing heat and light while forming new substances like carbon dioxide, water vapor, and ash.
8. breaking an egg: physical change (b)
Breaking an egg is a physical change since the chemical composition of the egg remains the same. The only change that occurs is the physical separation of the shell from the contents.
Therefore, the matches are as follows:
1. cutting paper: physical change (b)
2. rusting bike: chemical change (a)
3. spoiling milk: chemical change (a)
4. boiling water: physical change (b)
5. breaking glass: physical change (b)
6. popping popcorn: physical change (b)
7. burning wood: chemical change (a)
8. breaking an egg: physical change (b)