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What is particulate matter (PM)?

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Particulate matter (PM) refers to tiny solid or liquid particles suspended in the air, which can include dust, dirt, soot, and smoke. PM is classified by size, with PM10 (particles with a diameter of 10 micrometers or smaller) and PM2.5 (particles with a diameter of 2.5 micrometers or smaller) being the most concerning for health.

Front

What is the chemical formula for sodium chloride?

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The chemical formula for sodium chloride is NaCl.

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What happens during the hydration of NaCl in water?

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When NaCl is dissolved in water, the sodium ions (Na+) and chloride ions (Cl-) are surrounded by water molecules, which stabilize the ions in solution. This process is known as hydration.

Front

What is the difference between a mixture and a compound?

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A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means, while a compound is a substance formed when two or more elements chemically bond together, resulting in new properties.

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What is the significance of the reaction between H2 and O2 to form H2O?

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The reaction between hydrogen (H2) and oxygen (O2) to form water (H2O) is a fundamental chemical reaction that demonstrates the conservation of mass, as the number of atoms of each element is the same before and after the reaction.

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What does the term 'g' signify in chemical equations?

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The term 'g' signifies that the substance is in the gaseous state.

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What is a molecular diagram?

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A molecular diagram visually represents the arrangement of atoms within a molecule, showing how they are bonded together.

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What is the role of noble gases like Neon (Ne) in chemical reactions?

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Noble gases like Neon (Ne) are chemically inert due to their full valence electron shell, meaning they do not readily react with other elements.

Front

How can you identify a compound from a diagram?

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A compound can be identified in a diagram by the presence of two or more different types of atoms bonded together in a fixed ratio.

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What is the importance of understanding molecular structures in chemistry?

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Understanding molecular structures is crucial in chemistry as it helps predict the behavior, reactivity, and properties of substances.