Class 7 Science - UP
Exploring Substances: Acidic, Basic and Neutral
In the Class 7 UP Board Science chapter 'Exploring Substances: Acidic, Basic and Neutral', students learn to identify different materials based on their chemical nature. The chapter covers the taste and properties of acids and bases found in everyday life, such as lemon juice, vinegar, and soap. Students will discover how to use natural indicators like turmeric, litmus, and China rose to test these substances safely. Understanding neutralization reactions helps students see how acids and bases interact to form salt and water, a concept crucial for both daily life applications and scoring well in UP Board exams.
Start Learning FreeKey Concepts
Acids
Substances that are sour in taste and turn blue litmus paper red. Examples include lemon juice, tamarind, and vinegar.
Bases
Substances that are bitter in taste, feel soapy to touch, and turn red litmus paper blue. Examples include baking soda and soap.
Indicators
Special substances used to test whether a substance is acidic or basic by changing their color in different solutions.
Neutralization
A chemical reaction between an acid and a base that results in the formation of salt, water, and heat.
Neutral Substances
Substances that are neither acidic nor basic and do not change the color of litmus paper, such as pure water and common salt.
Important Formulas
Board Exam Info
In the UP Board Class 7 Science examinations, this chapter generally carries around 4 to 6 marks. Common question types include short answer questions, fill-in-the-blanks, matching natural indicators with their color changes, and explaining daily life applications like treating ant bites or soil treatment.
Frequently Asked Questions
What is an indicator and how does it work?
An indicator is a special chemical or natural substance that shows different colors when added to an acidic or a basic solution, helping us identify their nature.
Why does a turmeric stain on a white shirt turn reddish-brown when washed with soap?
Soap is basic in nature. When soap reacts with turmeric (which is a natural indicator), it changes its yellow color to reddish-brown.
What happens during a neutralization reaction?
During a neutralization reaction, an acid and a base mix to cancel each other's effects, producing salt, water, and heat.
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