CHEMISTRY NOTES (Chemical reactions and equations) CBSE, ICSE, NEET PREP
4 views 0 purchase
Course
Institution
Book
Science
these are the notes from the chemical reactions and equations, notes are fully elaborated with definitions and examples. just the right concept is covered.
thankyou!
To provide an in-depth review of the latest developments and research in public health, focusing on emerging trends, challenges, and innovations in disease prevention, health promotion, and global hea...
All for this textbook (49)
Written for
Secondary school
Unknown
5
Seller
Follow
aayushigosain
Content preview
CHEMICAL REACTIONS AND EQUATIONS
Thursday, August 17, 2023 8:35 PM
• CHEMICAL REATIONS AND EQUATIONS
○ PHYSICAL CHANGE : the changes in which no new substances
are formed. eg- melting of wax, tearing paper etc.
○ CHEMICAL CHANGE : the change in which a new substance
with different properties and nature is formed. eg- making of
curd from milk, rusting of iron. etc.
Characteristics of chemical change: chemical changes can be
confirmed by one or all of these characteristics of a chemical
change-
○ evolution of heat
○ change in color
○ change in temperature
○ change in state
○ CHEMICAL REACTION
chemical changes in which the substances react to form
entirely new substances with different properties.
REACTANTS : the original substances that take part in a
chemical reaction.
example- 2Ag + Cl2 = 2AgCl (here, Ag is the reactant)
CHEMICAL EQUATION
the symbolic representation of a chemical equation using
symbols and formulas.
BALANCED CHEMICAL EQUATION
an equation in which the elements have same number of
atoms on both the sides of an equation.
example-
CHARACTERSTICS OF CHEMICAL REACTION
, FORMATION OF PRECIPITATE ( in some reactions )
a solid substance that is formed after a chemical reaction.
example- yellow precipitate is formed when lead nitrate reacts
with potassium iodide.
CHANGE IN COLOR
there is a change in color of the reacting species of a chemical reaction.
example- change of the anklet's color rom silver to black.
CHANGE IN STATE
some chemical changes are accompanied by change in state of the
reactant. example- burning of magnesium ribbon, here, magnesium
ribbon changes into ashes from solid state after burning.
CHANGE IN TEMPERATURE
changes in temperature are often seen during a chemical reaction.
example- reaction between quick lime (CaO) and water H2O
EVOLUTION OF GAS
evolution of gas is seen in some chemical reactions. example- Zinc
reacts with hydrochloric acid and produces zinc chloride and hydrogen
gas.
TYPES OF CHEMICAL REACTION
COMBINATION DECOMPOSITIO DISPLACEMENT DOUBLE
REACTION N REACTION REACTION DISPLACEMENT
REACTION
COMBINATION REACTION
a reaction in which two or more than two elements or compounds
combine to form a new product.
example- 2Mg+O2 = 2MgO + heat
note- combination reaction is an exothermic reaction as it releases
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller aayushigosain. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.79. You're not tied to anything after your purchase.
