Grade 9 Exam > Grade 9 Videos > Chemistry for Grade 9 > Molecular Mass and Mole Concept
Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9
|
39 videos|52 docs|29 tests
|
FAQs on Molecular Mass and Mole Concept Video Lecture - Chemistry for Grade 9
| 1. What is molecular mass and how is it calculated? |  |
Ans. Molecular mass is the sum of the atomic masses of all the atoms in a molecule. It is calculated by adding up the atomic masses of each individual atom present in the molecule. The atomic masses can be found on the periodic table of elements. For example, the molecular mass of water (H2O) can be calculated by adding the atomic masses of two hydrogen atoms and one oxygen atom: (2 x atomic mass of hydrogen) + (1 x atomic mass of oxygen).
| 2. How is the mole concept used in chemistry? | |
Ans. The mole concept is used in chemistry to measure the amount of a substance. It relates the mass of a substance to the number of particles (atoms, molecules, or ions) it contains. One mole of any substance contains Avogadro's number (6.022 x 10^23) of particles. By using the mole concept, chemists can convert between mass, moles, and number of particles in chemical reactions and calculations.
| 3. Can you explain the difference between molecular mass and molar mass? | |
Ans. Molecular mass refers to the mass of a single molecule, while molar mass refers to the mass of one mole of a substance. Molecular mass is calculated by adding up the atomic masses of the atoms in a molecule, while molar mass is calculated by multiplying the atomic mass of an element by the number of atoms of that element in one mole of the substance. Molar mass is expressed in grams per mole (g/mol) and is used in stoichiometric calculations.
| 4. How do you convert between grams and moles using molar mass? | |
Ans. To convert between grams and moles using molar mass, you can use the following formula:
moles = mass (in grams) / molar mass (in g/mol)
First, determine the molar mass of the substance by summing up the atomic masses of all the atoms present in the molecule. Then, divide the given mass of the substance by the molar mass to calculate the number of moles.
| 5. Why is the mole concept important in chemical calculations? | |
Ans. The mole concept is important in chemical calculations because it allows chemists to determine the amount of a substance involved in a reaction. It provides a way to convert between mass, moles, and number of particles, which is essential for stoichiometric calculations. The mole concept also helps in determining the empirical and molecular formulas of compounds and in balancing chemical equations.
Related Exams
About this Video
|
4.89/5 Rating |
|
Nov 23, 2024 Last updated |
Video Description: Molecular Mass and Mole Concept for Grade 9 2024 is part of Chemistry for Grade 9 preparation.
The notes and questions for Molecular Mass and Mole Concept have been prepared according to the Grade 9 exam syllabus.
Information about Molecular Mass and Mole Concept covers all important topics for Grade 9 2024 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Molecular Mass and Mole Concept.
Introduction of Molecular Mass and Mole Concept in English is available as part of our Chemistry for Grade 9 for Grade 9 & Molecular Mass and Mole Concept in
Hindi for Chemistry for Grade 9 course. Download more important topics related with notes, lectures and mock test series for
Grade 9 Exam by signing up for free.
Description
Video Lecture & Questions for Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9 - Grade 9 full syllabus preparation | Free video for Grade 9 exam to prepare for Chemistry for Grade 9.
Information about Molecular Mass and Mole Concept
Here you can find the meaning of Molecular Mass and Mole Concept defined & explained in the simplest way possible.
Besides explaining types of Molecular Mass and Mole Concept theory, EduRev gives you an ample number of questions to practice Molecular Mass and Mole Concept tests,
examples and also practice Grade 9 tests.
|
39 videos|52 docs|29 tests
|
|
Explore Courses for Grade 9 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
practice quizzes
,Free
,past year papers
,video lectures
,Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9
,Viva Questions
,mock tests for examination
,Objective type Questions
,ppt
,Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9
,Semester Notes
,Previous Year Questions with Solutions
,Important questions
,MCQs
,Summary
,Extra Questions
,Sample Paper
,shortcuts and tricks
,Exam
,study material
,Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9
;
Study Molecular Mass and Mole Concept on the App
Students of Grade 9 can study Molecular Mass and Mole Concept alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Molecular Mass and Mole Concept,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Molecular Mass and Mole Concept is prepared as per the latest Grade 9 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup