Problem:
The quiz question asks:
"Which is the smallest unit of matter?"
#### Options:
- A: Atom
- B: Molecule
- C: Cell
- D: Particle
Solution:
To determine the correct answer, let's analyze each option step by step:
1.
Atom:
- An atom is the basic building block of matter. It is the smallest unit that retains the chemical properties of an element.
- Atoms are composed of subatomic particles (protons, neutrons, and electrons), but they are considered the fundamental unit of matter in chemistry.
2.
Molecule:
- A molecule is formed when two or more atoms chemically bond together.
- For example, a water molecule (H₂O) consists of two hydrogen atoms and one oxygen atom.
- Since molecules are made up of atoms, they are larger than atoms.
3.
Cell:
- A cell is the basic unit of life. It is a complex structure that contains various organelles and is much larger than both atoms and molecules.
- Cells are composed of many molecules, so they are not the smallest unit of matter.
4.
Particle:
- The term "particle" is quite general and can refer to various things, such as subatomic particles (e.g., protons, neutrons, electrons) or even larger entities like molecules or atoms.
- However, in the context of this question, "particle" is not a specific scientific term for the smallest unit of matter. It is too vague compared to the other options.
Conclusion:
Among the given options, the
atom is the smallest unit of matter. It is the fundamental building block of all elements and cannot be divided into smaller units while retaining its chemical identity.
Final Answer:
\boxed{A}
Parent Tip: Review the logic above to help your child master the concept of quiz questions year 5.
