Class 9 Exam > Class 9 Videos > Introduction to Atoms and Molecules - Atoms & Molecules
Introduction to Atoms and Molecules - Atoms & Molecules Video Lecture - Class 9
FAQs on Introduction to Atoms and Molecules - Atoms & Molecules Video Lecture - Class 9
| 1. What is an atom and how is it different from a molecule? |  |
Atoms are the building blocks of matter, consisting of a nucleus containing protons and neutrons, surrounded by electrons. Molecules, on the other hand, are formed when two or more atoms chemically combine. The main difference is that atoms are individual particles, while molecules are made up of multiple atoms bonded together.
| 2. How are atoms and molecules related to chemistry? | |
Atoms and molecules are fundamental to the study of chemistry. Chemistry focuses on the interactions and transformations of these particles, exploring how atoms combine to form molecules and how molecules interact to create new substances. Understanding the behavior of atoms and molecules is crucial in explaining chemical reactions and the properties of different substances.
| 3. Can atoms and molecules be seen with the naked eye? | |
No, atoms and molecules cannot be seen with the naked eye due to their incredibly small size. Atoms are typically on the scale of picometers (10^-12 meters), while molecules can range in size depending on the number and types of atoms they contain. Specialized instruments such as electron microscopes are needed to visualize atoms and molecules.
| 4. How do atoms and molecules form different substances? | |
Atoms and molecules combine through chemical reactions to form different substances. When atoms bond together, they create molecules with unique properties. The type and arrangement of atoms in a molecule determine its chemical behavior and characteristics. By rearranging and bonding different atoms, a wide variety of substances can be formed, each with its own distinct properties.
| 5. Can atoms and molecules be destroyed or created? | |
In a chemical reaction, atoms and molecules can neither be created nor destroyed. This is known as the law of conservation of mass. During a reaction, atoms are rearranged and bonds are broken or formed, but the total number of atoms remains the same. This means that atoms and molecules are conserved throughout any chemical process, only changing in their arrangement and combinations.
Text Transcript from Video
as early as the 6th century BC the Greek
philosophers stated that all matter
could be broken down into four basic
substances fire air water and earth in
the fifth century
Democritus pondered further the nature
of these primitive elements and thought
there must be things that are still
smaller something which is common in
every substance this made him think
deeper and postulate the existence of
the ultimate smallest particles the
atoms these ultimate particles are so
small that they are not visible by naked
eyes fire air water and earth also have
their individual atoms which are
connected with each other after the
atoms a term for a slightly bigger
entity was coined that term we know as
the molecules let's start a journey of
atoms and molecules through this chapter
here we will be studying about Dalton's
theory laws of chemical combinations
atoms molecules and ions writing
chemical formula of compounds
determining molecular mass and formula
unit mass mole concept let's set out on
the voyage of exploring the atoms and
molecules further
philosophers stated that all matter
could be broken down into four basic
substances fire air water and earth in
the fifth century
Democritus pondered further the nature
of these primitive elements and thought
there must be things that are still
smaller something which is common in
every substance this made him think
deeper and postulate the existence of
the ultimate smallest particles the
atoms these ultimate particles are so
small that they are not visible by naked
eyes fire air water and earth also have
their individual atoms which are
connected with each other after the
atoms a term for a slightly bigger
entity was coined that term we know as
the molecules let's start a journey of
atoms and molecules through this chapter
here we will be studying about Dalton's
theory laws of chemical combinations
atoms molecules and ions writing
chemical formula of compounds
determining molecular mass and formula
unit mass mole concept let's set out on
the voyage of exploring the atoms and
molecules further
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Nov 29, 2024 Last updated |
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