Class 7 Exam > Class 7 Videos > Chemical Substances and Process - Science, Class-7
Chemical Substances and Process - Science, Class-7 Video Lecture - Class 7
FAQs on Chemical Substances and Process - Science, Class-7 Video Lecture - Class 7
| 1. What are chemical substances? |  |
Ans. Chemical substances are forms of matter that have a definite chemical composition and distinct properties. They are made up of elements or compounds and can exist as solids, liquids, or gases. Examples of chemical substances include water, salt, oxygen, and carbon dioxide.
| 2. What is the role of chemical substances in processes? | |
Ans. Chemical substances play a crucial role in various processes. For example, in chemical reactions, substances interact and combine to form new substances with different properties. In industrial processes, chemicals are used to produce goods and materials. Additionally, chemical substances are also involved in natural processes such as photosynthesis, respiration, and digestion.
| 3. How are chemical substances classified? | |
Ans. Chemical substances can be classified based on various criteria. One common classification is based on their composition, where substances are categorized as elements or compounds. Elements are pure substances that cannot be broken down into simpler substances, while compounds are composed of two or more elements chemically combined. Another classification is based on their physical state, where substances are classified as solids, liquids, or gases.
| 4. What are some examples of chemical processes? | |
Ans. Chemical processes are diverse and occur in everyday life, industry, and nature. Some examples include combustion (burning of fuel), rusting of iron, cooking, fermentation, and photosynthesis. Industrial chemical processes include the production of fertilizers, plastics, medicines, and various other products.
| 5. How do chemical substances affect the environment? | |
Ans. Chemical substances can have both positive and negative effects on the environment. Some chemicals, such as fertilizers and pesticides, can enhance agricultural productivity. However, improper use or disposal of chemicals can lead to pollution of air, water, and soil. Chemical substances can also contribute to climate change and the depletion of ozone layer if they are greenhouse gases or ozone-depleting substances. It is important to handle and manage chemical substances responsibly to minimize their negative impact on the environment.
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