Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
Atoms of a given element are identical
(b) in mass and chemical properties. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(b) in mass and chemical properties.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
See lessMagnesium and sulphur combine to form magnesium sulphide with the masses of magnesium and sulphur in the ratio of
(C) Mg + S → MgS 24 g 32 g Ratio by mass in which Mg and S combine = 24:32 or 3:4 https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(C) Mg + S → MgS
24 g 32 g
Ratio by mass in which Mg and S combine = 24:32 or 3:4
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
See lessWhich of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal
(c) Changes (i), (iii) and (iv) are physical in nature because we can get back to the original form by physical methods. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(c) Changes (i), (iii) and (iv) are physical in nature because we can get back to the original form by physical methods.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessValencies of aluminium and phosphate are
(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
See lessTwo chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning the species X, Y and P correct? (i) P is a compound. (ii) X and Y are compounds. (iii) X and Y are elements. (iv) P has a fixed composition.
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See less