اجابات لاأداء المنزلى 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: Homework
Cross out the odd
word, then write the relation between the remaining words:
- Gold - Silver - Bromine - Mercury
- Odd word: Bromine
(non-metal, while the others are metals).
- Relation: Gold,
Silver, and Mercury are all metals.
- Phosphorus - Bromine - Mercury - Sulfur
- Odd word: Mercury
(metal, while the others are non-metals).
- Relation: Phosphorus,
Bromine, and Sulfur are all non-metals.
- Graphite - Bromine - Phosphorus - Sulfur
- Odd word: Graphite
(good conductor of electricity, while the others are poor conductors).
- Relation: Bromine,
Phosphorus, and Sulfur are all poor conductors of electricity.
- Iodine - Sulfur - Carbon - Hydrogen
- Odd word: Hydrogen
(gas, while the others are solids).
- Relation: Iodine,
Sulfur, and Carbon are all solids.
- Bronze - Chlorine - Copper - Tin
- Odd word: Chlorine
(non-metal, while the others are metals or alloys).
- Relation: Bronze,
Copper, and Tin are all metals or metal alloys.
Give reasons for the
following:
- Calcium (20Ca) is a metal while chlorine (17Cl) is a
non-metal.
- Reason: Calcium
has a metallic bond and loses electrons easily, while chlorine has a
covalent bond and gains electrons easily.
- Carbon is used in the manufacture of dry cells,
although it is a non-metal.
- Reason: Carbon,
in the form of graphite, is a good conductor of electricity, making it
suitable for use in dry cells.
- Calcium (20Ca) is more in hardness than sodium (11Na).
- Reason: Calcium
has a stronger metallic bond due to its higher number of valence
electrons, making it harder than sodium.
- Bronze alloy is used in the manufacture of medals
instead of copper.
- Reason: Bronze
is harder and more resistant to corrosion than pure copper, making it
more suitable for medals.
What is the benefit of
recycling metal wastes?
- Answer: Recycling
metal wastes reduces the need for mining raw materials, conserves natural
resources, reduces energy consumption, and decreases environmental
pollution.
Two elements (A &
B) have melting points of (1538 - 115.21) respectively.
A) What is the type of each one of them? And
why?
- Element A (1538°C): Metal
(high melting point due to strong metallic bonds).
- Element B (115.21°C): Non-metal
(low melting point due to weak covalent bonds).
B) Which one of them is a good conductor of
electricity?
- Answer: Element
A (metal) is a good conductor of electricity.
C) Which one of them is malleable and ductile?
- Answer: Element
A (metal) is malleable and ductile.
What happens in each
of the following:
- Knocking on a piece of graphite.
- Answer: Graphite
will break into layers due to its layered structure, but it will not
shatter like a typical non-metal.
- Increasing the number of valence electrons in metal
atoms according to the metallic bond.
- Answer: The
metallic bond becomes stronger, increasing the metal's hardness and
melting point.
- Mixing molten gold with molten copper.
- Answer: A
homogeneous mixture (alloy) called "rose gold" is formed, which
has properties different from pure gold or copper.
