الفصل الثاني

ملخص درس المركبات والتغيرات الكيميائية علوم منهج إنجليزي صف خامس فصل ثاني

ملخص درس المركبات والتغيرات الكيميائية علوم منهج إنجليزي صف خامس فصل ثاني

مرفق لكم ملخص درس المركبات والتغيرات الكيميائية علوم منهج إنجليزي صف خامس فصل ثاني مناهج الامارات

معلومات المذكرة

  • نوع الملف: ملخص
  • المادة: علوم
  • الصف: الخامس
  • الفصل الدراسي: الفصل الثاني
  • صيغة الملف: pdf متاح للتحميل

 صندوق تحميل الملف

Chapter6:physical and chemical changes Lesson2:Compounds and Chemical changes
what is Compounds? Page330
Name and Formulas

Matter
mind map
review

Recap of
Element Atom

molecule

Introduce of
compound

Compounds

A substance that is formed by chemical

 combination of two or more elements

And act like single substance

Example: sodium and chlorine

is combined to form salt

Carbon Dioxide CO2

One atom of carbon

And

Two atoms of oxygen

Sodium Chloride NaCl

One atom of sodium

One atom of chlorine 

Quick Check
What is the minimum number of
atoms in a compound? Why?

Two atoms of two different elements, because two atoms of same element is molecule, and one atom of one element is atom it self

The chemical formula is made of the element symbols.

It tells us how many of each atom are in the compound.

  • Example: Carbon dioxide

Carbon is C

Oxygen is O

    Carbon dioxide is made of

    1 carbon and 2 oxygen.

Example: water as H2O

!? Draw Fe2O

potassium hydroxide (KOH)

Lithium chloride (LiCl)

Uses of prefixes with compounds

Mon- means one

Example:  Carbon monoxide

CO

Di- or Bi- means two, Carbon Dioxide CO2

Tri- means three

Phosphorus trichloride-PCl3

Chemical Changes/reaction

A change of matter that occurs when

Atoms link together in a new way,

Creating new substance

Example: the fiery reaction of sodium and

 chlorine is combined to form salt

Chemical Equation

Products                                                                Reactants

Sodium chloride                                                    One atom of sodium

   One atom of chlorine                                             Compound

Math analogy

2+5 = 4+3

Chemical Equation

                                       2H2        +       O2            ⇒                 2H2O

 

 

Chemical Equations

•Chemists write equations to show chemical changes.

Reactants 

The chemical on the left side of a

Chemical equation

                               

Reactants

K : potassium

H2O : water

products

The chemical on the right side of a

Chemical equation

                               

products

KOH: potassium hydroxide

H2 : hydrogen

Example

………………………………… ? What we call this equation

   Reactants                                               products 

                               …………………..…… : Li …………………..……                      LiOH: 

                               …………………..…… : H2O …………………..……                      H2 

Signs of chemical changes or reaction

Remember : Sodium and chlorine react to make salt

 ! What is the sign of this reaction

It’s fiery reaction, so heat of the fire

Light of the fire

The final shape of products

? How can you spot a chemical change

Chemical changes make products that have new properties

. like a new look, sound, or smell

SIGNS OF  CHEMICAL CHANGE

Quick check/ page333

4 atom of hydrogen+2 atoms of oxygen will form 2 water molecule

8 molecule of water

Since we have 32 atom hydrogen so

32/4=8

And 16 atom of oxygen

16/2=8

So 8 molecule of water will be formed

Remember : Sodium and chlorine react to make salt

 !What is the sign of this reaction

How can you use chemical changes?/page336

Photosynthesis

Cellular respiration

Energy for machines

Fossil fuels

Plastic

Lesson 2 review/page338

Compound: A substance that is formed by chemical

 combination of two or more elements

And act like single substance

Chemical reaction: A change of matter that occurs when

Atoms link together in a new way,

Creating new substance

Signs of chemical change: such as Changes color, Releases odor

Releases gas, Forms a solid that doesn’t dissolve, Changes temperature

Lesson 2 review/page339

1-Vocabulary:
substances on the left side of a chemical equation are called Reactants

4-Test Prep
which processes release carbon dioxide?  Wood burning

Essential Question

By chemical reaction which is change of matter that occurs when

Atoms link together in a new way, Creating new substance

تصفح أيضا:
زر الذهاب إلى الأعلى