Summary
Summary Class 10 chemistry chapter 1 notes CBSE
- Course
- Institution
This document contains notes based on science chapter 1 with good prints and good examples
[Show more]
Seller
Follow
yashpurohit
Content preview
Balanced Chemical EquationsIn the reaction Mg + O2 → MgO, the number of atoms of each
element on either side of the arrow is not equal. Therefore, this is an
unbalanced chemical equation. Then what is a balanced equation?
Let’s find out below and learn how to balance a chemical equation.
Balanced Equations
As you have already learned earlier, mass can neither be created nor
destroyed. This law applies to a chemical reaction too. This means that
the total mass of elements in the products of a chemical reaction has to
be equal to the total mass of the elements in the reactants. The number
of atoms of each element remains the same, before and after a
chemical reaction. For example, let’s look at the following chemical
equation –
Zinc + Sulphuric acid → Zinc sulfate + Hydrogen
This is further simplified as –
Zn + H2SO4 → ZnSO4 + H2
,Now, let us look at the number of atoms of each element on LHS and
RHS –
Number of atoms in Number of atoms in
Element
reactants (LHS) products (RHS)
Zn 1 1
H 2 2
S 1 1
O 4 4
As you can see, the number of atoms of each element on LHS and
RHS are the same. Therefore, this chemical equation is a ‘balanced
equation’. Now, look at the following equation –
Fe +H2O → Fe3O4 +H2
, If you notice, the number of atoms of each element are not the same
on both sides of the arrow. Therefore, this is an ‘unbalanced’ equation.
We can balance this equation using the following steps –
Step I
First, draw boxes around each formula without changing anything
inside the boxes.
Step II
List the number of atoms of each element on either side of the arrow
in the equation –
Number of atoms in Number of atoms in
Element
reactants (LHS) products (RHS)
Fe 1 3
H 2 2
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 yashpurohit. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.39. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now