An atom is the smallest particle of an element that keeps the chemical properties of that element. Atoms are the basic building blocks of all matter. What Are Atoms Made Of? Atoms contain three main subatomic particles: These particles have different charges and positions inside the atom. Structure of an Atom Atoms have: The nucleus…
A physical change changes the appearance or state of a substance without creating a new substance, while a chemical change forms one or more new substances with different properties. What Is a Physical Change? A physical change changes the form or state of a substance without changing its chemical composition. No new substance forms during…
A chemical reaction is a process where substances change into new substances by rearranging atoms and forming new bonds. Chemical reactions happen in everyday life, from rusting iron to burning fuel and digestion. Example of a Chemical Reaction 2Mg+O2→2MgO2Mg + O_2 \rightarrow 2MgO In this reaction: The atoms rearrange to form a new substance. Signs…
Reactants are substances that take part in a chemical reaction. Products are the new substances formed after the reaction. What Are Reactants? Reactants are substances that take part in a chemical reaction. They are the starting materials before the reaction happens. In chemical equations, reactants appear on the left side of the arrow. Example of…
The Law of Conservation of Mass states that mass cannot be created or destroyed during a chemical reaction. This means: Because of this, the total mass stays the same. Examples You can see this law in daily life. Burning Wood When wood burns, it changes into: The total mass still remains the same. Melting Ice…
You can balance a chemical equation by adjusting coefficients so that the number of atoms on both sides becomes equal. Balancing chemical equations can feel confusing at first. Many students struggle to make both sides equal. But once you learn a clear method, it becomes simple and logical. In this guide, you will also see…
As the academic year reaches its crescendo, students across Australia are deep in exam mode. The HSC exam season has been running since Thursday 16 October and finishes Friday 7 November 2025; the VCE written exams kick off on Tuesday 28 October (English/EAL) and run through Wednesday 19 November 2025; and the IB November session spans late October…
As the academic year reaches its crescendo, students across Australia are deep in exam mode. The HSC exam season has been running since Thursday 16 October and finishes Friday 7 November 2025; the VCE written exams kick off on Tuesday 28 October (English/EAL) and run through Wednesday 19 November 2025; and the IB November session spans late October…
As the academic year reaches its crescendo, students across Australia are deep in exam mode. The HSC exam season has been running since Thursday 16 October and finishes Friday 7 November 2025; the VCE written exams kick off on Tuesday 28 October (English/EAL) and run through Wednesday 19 November 2025; and the IB November session spans late October…
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