Chemical Substance and Process
Chemical substances are forms of matter that have constant composition and distinct properties. These substances undergo various processes to transform into different forms. Understanding chemical substances and processes is crucial in the field of science.

Chemical Substance
- A chemical substance is a form of matter that has a specific composition and distinct properties.
- Examples of chemical substances include water (H2O), salt (NaCl), and oxygen (O2).
- Chemical substances can be classified as elements, compounds, or mixtures based on their composition.

Chemical Process
- A chemical process involves the transformation of one or more chemical substances into new substances.
- Chemical processes can be physical changes (such as melting or boiling) or chemical changes (such as combustion or rusting).
- Understanding chemical processes is essential in various industries, including pharmaceuticals, agriculture, and manufacturing.

Science for Class 7 (VII) - CBSE & NCERT Curriculum
- In Class 7, students learn about the basic concepts of chemistry, including chemical substances and processes.
- The CBSE and NCERT curriculum for Class 7 covers topics such as atoms and molecules, acids and bases, and chemical reactions.
- Students also learn about the properties of different chemical substances and the various processes involved in chemical reactions.
In conclusion, understanding chemical substances and processes is essential in the field of science. By studying these concepts in Class 7 as per the CBSE and NCERT curriculum, students can develop a strong foundation in chemistry.