Concepts in Chemistry
Why does matter exists in different phases? Matter exists in different phases (solid, liquid and gas) because of two main reasons. These reasons are changes in Temperature (average speed of …
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What's a Pure substance? A pure substance is a chemical that has definite and constant composition. Definite composition means that the makeup of the chemical is fixed and constant throughout the pure …
What's Matter? Matter is anything that occupies space and has mass. So, what's mass? Mass is the amount of material (stuff) packed in a given substance. What then is material or stuff? …
What's a Mixture? A mixture is when two or more chemicals are intermingled (mixed) with each other. Pay attention to the text in bold: intermingled. When you add salt to sand, you have created a …
What is a Molecule? A molecule is formed when two or more atoms of the same or different type unite to form a bond (a force of attraction between atoms). Notice the text in bold: atoms of same or …
What's a Compound? A compound is formed when at least two different atoms react in specific amounts (fixed-mass ratios) to make a new substance. Pay attention to the text in bold: different …
