Science Class 8: Atoms and Ions Quiz

Study Notes

Exercise 01: 8P

Classify objects: Zinc, Balloon, PVC, Chair, Stylus, Wood
True/False statements:
- A cation has a positive charge. (True)
- An atom has a negative charge. (False)
- Copper is a reddish-brick color. (True)
- Aluminium is attracted to magnets. (True)
Atom composition:
- Atoms contain a nucleus (with protons and neutrons) and an electron cloud.
- Electrons have a negative charge.
- Protons have a positive charge.

Exercise 02: 8P

Atomic number of calcium (Ca) is 20 (Z = 20).
Calculate electron charge of calcium:
- Calculate electron charge in Coulombs.
Calculate calcium nucleus charge:
- Calculate nucleus charge in Coulombs.
Calcium ion formation:
- Calcium can lose two electrons.
- Determine the charge of calcium ions.
Formula for calcium ion: (Ca2+)
Type of calcium ion: Cation.

Exercise 03

Electric wire is composed of 2 materials (A & B).
Wire structure (Diagram).
Determine material B properties.
- Color of material B (from diagram).
- Family of material B.
- Electrical property of material B.
Material A flame test.
- Color of the flame when material A is heated.
- Identify material A (from flame color).

Description

Test your knowledge on basic atomic structure and ion formation with this quiz designed for 8th-grade science. You will classify objects, determine charges, and understand the properties of different elements. See how well you grasp the concepts of cations and electron charges!