Questions and Answers
What is an indicator?
A dye that changes to different colors in acids and alkalis.
What is meant by a neutral substance?
A substance that is neither an acid nor an alkali, with a pH of 7.
What does the pH scale represent?
A numerical scale from 1 to 14 showing how acidic or alkaline a substance is.
What is a chemical reaction?
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What is neutralization?
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What are products in a chemical reaction?
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What are reactants?
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What is salt in a chemical context?
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What is an antacid?
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What is a base?
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A neutral substance has a pH of ___
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A substance with a pH of 2 is classified as an ___
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A substance with a pH of 10 is classified as a ___
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A substance with a pH of 4 is classified as an ___
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A substance with a pH of 5 is classified as an ___
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A substance with a pH of 12 is classified as a ___
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A substance with a pH of 7.4 is classified as ___
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Study Notes
Acid and Alkali Concepts
- Indicator: A dye that changes color in the presence of acids or alkalis.
- Neutral: Refers to a substance with a pH of 7, indicating it is neither acidic nor alkaline.
pH Scale
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pH Scale: Ranges from 1 to 14, measuring acidity or alkalinity.
- Acids: pH below 7.
- Neutral substances: pH of 7.
- Alkalis: pH greater than 7.
Chemical Processes
- Chemical Reaction: Involves a transformation where new substances are created.
- Neutralisation: A reaction between an acid and an alkali (or base) resulting in the formation of salt and water.
Chemical Entities
- Products: New substances formed during a chemical reaction, located on the right side of a word equation.
- Reactants: The starting substances in a chemical reaction, noted on the left side of a word equation.
- Salt: The substance produced (apart from water) when an acid reacts with an alkali or base.
Practical Applications
- Antacid: A remedy for indigestion, containing a base that neutralises excess stomach acid.
- Base: Any substance that can neutralize an acid, yielding a salt and water in the process.
pH Values
- pH 2: Highly acidic.
- pH 4: Mildly acidic.
- pH 5: Slightly acidic.
- pH 7: Neutral.
- pH 7.4: Slightly basic, typical for bodily fluids.
- pH 10: Mildly basic.
- pH 12: Strongly basic.
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Description
Test your knowledge on important concepts related to acids and alkalis with this quiz. Explore definitions such as Indicator, Neutral, and the pH scale, which are crucial to understanding chemical properties. Perfect for students learning about chemistry fundamentals!
