اجابات لاأداء الصفى الاسبوع الاول فى الساينس لغات للصف الاول الاعدادى الترم الثانى 2025
تحميل الاجابات pdf
الاجابات بدون تحميل
Ministry of Education
Central Administration
for Curriculum Development
Science Consultant
Office
First Year of Middle
School
First Term 2024/2025
Science
Unit One: Elements and
Chemical Bonds
Lesson One: Classroom
Performance
The following table
shows some materials and their properties:
A) Choose from columns B, C, D what matches
column A.
B) Then determine which one is a metal and which one is a non-metal.
|
Element |
Physical State |
Electric Conductivity |
Color |
|
1- Oxygen |
Gas |
Poor conductor |
Colorless |
|
2- Gold |
Solid |
Good conductor |
Yellow |
|
3- Carbon |
Solid |
Poor conductor |
Black |
|
4- Bromine |
Liquid |
Poor conductor |
Red |
|
5- Nitrogen |
Gas |
Poor conductor |
Colorless |
|
6- Mercury |
Liquid |
Good conductor |
Silver |
|
7- Phosphorus |
Solid |
Poor conductor |
White waxy |
Answers:
- Metals: Gold,
Mercury (good conductors of electricity and heat, shiny).
- Non-metals: Oxygen,
Carbon, Bromine, Nitrogen, Phosphorus (poor conductors of electricity and
heat, not shiny).
The following figure
shows a bond between two different elements:
1) What are the types of the two elements in
the figure? And why?
- Element 1: Metal
(contains cations and a cloud of free electrons).
- Element 2: Non-metal
(has few valence electrons).
2) What is the valency of each?
- Metal: Low
valency (easily loses electrons).
- Non-metal: High
valency (easily gains electrons).
3) What is the type of bond in both of them?
- Metal: Metallic
bond (between metal atoms).
- Non-metal: Covalent
bond (between non-metal atoms).
4) Which is stronger in terms of bond? And
why?
- Metallic bond is stronger: Due to the strong attraction between cations and
the cloud of free electrons.
