Let's go through each question one by one and solve them step by step.
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Q.2: Label the parts of an atom on the diagram below.
The diagram shows a simplified model of an atom with:
- A central core (nucleus) made up of
protons (red, with + sign) and
neutrons (green, no charge).
- Electrons (blue, with – sign) orbiting around the nucleus in shells.
####
Correct Labels:
- The
central cluster (red and green particles) is the
Nucleus.
- The
red particles inside the nucleus are
Protons.
- The
green particles inside the nucleus are
Neutrons.
- The
blue particles outside the nucleus are
Electrons.
✔ So the labels are already correctly placed:
- Nucleus → center
- Proton → red (+)
- Neutron → green (no charge)
- Electron → blue (–), orbiting
✔️ This part is
correctly labeled.
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Q.3: _______ is a pure substance containing only one kind of atom, and it cannot be broken down into a simpler substance.
Let’s analyze the options:
a)
Molecule – A group of atoms bonded together. Can be made of same or different atoms. Not necessarily pure or unbreakable.
✘
b)
Element – A pure substance made of only one type of atom. Cannot be broken down into simpler substances by chemical means.
✔
c)
Ion – A charged atom or molecule. Not a pure substance classification.
✘
d)
Compound – Made of two or more different elements chemically bonded.
✘
✔ Correct answer: b) Element
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Q.4: Which of the following molecules is composed of one type of atom?
Look at each option:
a)
H₂ – Two hydrogen atoms bonded together. Only
hydrogen atoms present.
✔
b)
H₂O – Two hydrogen and one oxygen → two types of atoms
✘
c)
NH₃ – One nitrogen and three hydrogens → two types
✘
d)
CH₄ – One carbon and four hydrogens → two types
✘
Only
H₂ consists of
one type of atom (hydrogen).
✔ Correct answer: a)
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✔ Final Answers:
-
Q.2: Diagram is correctly labeled.
-
Q.3: b) Element
-
Q.4: a) H₂
Let me know if you'd like a visual explanation or further details!
Parent Tip: Review the logic above to help your child master the concept of atoms and molecules worksheet.
