Grade 9 Subjects > Chemistry Worksheets

Acids, Bases, and Salts
These compounds have distinct properties and play crucial roles in various chemical processes. Understanding their characteristics and behavior is e...
Atomic and Molecular Masses
The atomic mass of an element is the average mass of the atoms of an element, measured in atomic mass units (amu). It is a weighted average that tak...
Atomic Number and Mass Number
Each atom consists of a nucleus and one or more electrons. The nucleus contains particles known as protons and neutrons...
Atoms and Molecules
At the heart of chemistry are atoms and molecules, the building blocks of the universe. Understanding these fundamental units is crucial for graspin...
Bohr's Model of Atom
Bohr's Model of Atom was introduced in 1913, and it provided a new way to understand atomic structure and spectral lines. This model is specifically...
Centrifugation
The primary principle behind centrifugation is the application of centrifugal force to compel denser substances to migrate outward in the direction o...
Chemical Reactions and Equations
One of the key concepts in chemistry is the idea of a chemical reaction. A chemical reaction involves the transformation of one or more substances i...
Chromatography
It is widely used in various fields such as chemistry, biology, and environmental science. The principle of chromatography is based on the different...
Colloids
Unlike a solution, where the solute is dissolved and cannot be seen, the particles in a colloid are large enough to scatter light. This scattering o...
Crystallization
This process is widely used in various industries, including pharmaceuticals, food, and materials science, to purify substances and obtain solid mate...
Dalton's Atomic Theory
Known as Dalton's Atomic Theory, this concept revolutionized the way scientists understood matter and its composition. According to Dalton, all matt...
Distillation
It is a physical process and one of the oldest methods employed for the purification of liquids. The process of distillation involves heating a liqu...
Diversity in Living Organisms
This diversity is the result of billions of years of evolution, where organisms have adapted in myriad ways to their environments. Studying this div...
Electronic Configuration
An electron's configuration refers to the arrangement of electrons in an atom, which is crucial in determining the atom's chemical properties. Elect...
Elements, Compounds, and Mixtures
It helps us understand the world around us by explaining the interactions between different types of substances. At the core of chemistry are elemen...
Empirical and Molecular Formula
Two important concepts that help in this understanding are the empirical formula and the molecular formula. These formulas provide insights into the...
Evaporation and Condensation
These processes are essential parts of the water cycle and have numerous applications in various fields. Understanding how they work is crucial for ...
Force and Laws of Motion
These laws were first formulated by Sir Isaac Newton and are foundational to the field of physics. Newton's laws of motion describe the relationship...
Gravitation
It is a force that acts between any two bodies in the universe. This force is what keeps planets in orbit around stars, moons in orbit around planet...
Improvement in Food Resources
One method to achieve this is through the improvement in food resources. This involves several strategies, including the use of high-yielding variet...
Is Matter Around Us Pure
But have you ever wondered if these substances are pure? In chemistry, the term pure substance has a specific meaning. A pure substance is made up o...
Isotopes and Isobars
The number of protons in the nucleus of an atom defines its atomic number, which in turn determines the chemical element. However, atoms of a partic...
Laws of Chemical Combination
One of the fundamental aspects of chemistry is understanding how substances combine to form new compounds. This understanding is governed by the Law...
Matter in Our Surroundings
Everything around us is made up of matter, and it comes in various forms. Understanding the concept of matter is essential for comprehending the phy...
Metalloids
They are located along the stair-step line that divides metals and non-metals on the periodic table. This unique position allows metalloids to posse...
Metals and Non-metals
Metals are typically found on the left side and in the middle of the periodic table, whereas non-metals are located on the right side. These element...
Mixtures and Compounds
A mixture is a combination of two or more substances where each substance retains its own chemical identity. In contrast, a compound is a substance ...
Mole Concept and Molar Masses
The mole concept is a fundamental idea that helps chemists measure and quantify substances accurately. A mole is a unit that measures the amount of ...
Motion
Motion refers to the change in position of an object over time. In chemistry, this concept is often related to the movement of molecules and atoms w...
Natural Resources
They are classified into two main categories: _renewable_ and _non-renewable_ resources. Understanding these resources is crucial for sustainable de...
Percentage Composition
The percentage composition refers to the percentage by mass of each element in a compound. It provides insight into the relative amount of each cons...
Physical and Chemical Changes
These changes are broadly classified into two categories: physical changes and chemical changes. Understanding these changes is crucial for grasping...
Rutherford's Model of Atom
The prevailing model at the time was J. J...
Separation Techniques
These methods are known as separation techniques. They are used to isolate specific substances from mixtures, each based on the physical properties ...
Solutions and Suspensions
Both are types of mixtures, but they have distinct characteristics. A solution is a homogeneous mixture where the solute is completely dissolved in ...
Sound
When an object vibrates, it causes the particles of the surrounding medium to vibrate as well. These vibrations travel through the medium as a longi...
States of Matter
Matter is anything that occupies space and has mass. It exists in different physical forms known as states of matter...
Structure of the Atom
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionize...
Sublimation
It is the process where a solid changes directly into a gas without passing through the liquid state. This phenomenon occurs under specific conditio...
The Fundamental Unit of Life
It is the smallest and most basic building block of all living organisms. Everything that a living organism does can be traced back to the functions...
Thomson's Model of Atom
J. Thomson marked a significant milestone in the field of atomic theory...
Tissues
In multicellular organisms, tissues are essential for the organization of life. They ensure that the organism functions efficiently and effectively...
Valency
One of the fundamental concepts in chemistry that helps us understand how elements combine to form compounds is valency. Valency is a measure of the...
Why Do We Fall Ill
Illness can result from a variety of factors, but primarily it occurs due to the presence of pathogens in our environment. These are microorganisms ...
Work and Energy
Understanding these concepts is crucial as they form the basis of many scientific phenomena. Work, in scientific terms, is defined as the product of...