GSEB Solutions for Class 7 Science and Technology – Element, Compound and Mixture (English Medium)
GSEB SolutionsMathsScience
Exercise 76:
Solution 1(a):
When a strip of magnesium is burnt in candle flame, it burns with a dazzaling light and white coloured ash of magnesium oxide is formed.
Exercise 79:
Solution 1(a):
Common salt is not attracted by the magnet.
Solution 1(b):
Iron filings get attracted by the magnet.
Solution 1(c):
Common salt does not get attracted to the magnet while iron filings get attracted to the magnet. Thus, the individual properties of salt and iron filings retain their properties.
Exercise 80:
Solution 1.1:
c. Oxygen
Solution 1.2:
b. Water
Solution 1.3:
d. Gold
Solution 2:
Element: oxygen, iron, silver
Compound: carbon dioxide, sugar, water
Mixture: air, soil
Solution 3.1:
| Element | Compound |
| Elements are made up of one kind of atoms. | Compounds are made up of two or more kinds of atoms. |
| Elements cannot be broken down into simpler substances by any physical or chemical method. | Compounds can be broken down into simpler substances by chemical methods. |
| Elements have their own set of properties. | Properties of a compound differ from those of their elements. |
| Example: Hydrogen, Oxygen | Example: Water |
Solution 3.2:
| Compound | Mixture |
| Components of a compound lose their individual properties. | Components of a mixture retain their individual properties. |
| Simple physical separating processes cannot be used to separate individual components. | Simple physical separating processes can be used to separate individual components. |
| Component proportion is fixed. | Component proportion is not fixed. |
Solution 3.3:
| Element | Mixture |
| It consists of only one type of atoms. | It consists of more than one type of atoms. |
| No other component can be obtained as it is made up of the same type of atoms. | Simple physical separating processes can be used to separate individual components. |