(i) BaCl₂(aq)+Na2SO₄(aq) → BaSO₄(s) +2NaCl(aq) (ii) NaOH(aq) + HCl(aq) → NaCl(aq)+H₂O(l) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
Magnesium is very reactive metal like (Na, Ca, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (MgO) on its surface. 𝑀𝑔⏟𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚+𝑂₂⏟𝑂𝑥𝑖𝑔𝑒𝑛 → 2𝑀𝑔𝑂⏟ 𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚 𝑂𝑥𝑖𝑑𝑒 This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen.Read more
Magnesium is very reactive metal like (Na, Ca, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (MgO) on its surface.
𝑀𝑔⏟𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚+𝑂₂⏟𝑂𝑥𝑖𝑔𝑒𝑛 → 2𝑀𝑔𝑂⏟ 𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚 𝑂𝑥𝑖𝑑𝑒
This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be used for the reaction.
(a) Corrosion: Corrosion is defined as a process where materials, usually metals, deteriorate as a result of a chemical reaction with air, moisture, chemicals, etc. • Iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide (a brown flaky substance) called rust. • Silver artRead more
(a) Corrosion: Corrosion is defined as a process where materials, usually metals, deteriorate as a result of a chemical reaction with air, moisture, chemicals, etc.
• Iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide (a brown flaky substance) called rust.
• Silver articles become black after some time when exposed to air. This is because it reacts with sulphur in the air to form a coating of silver sulphide.
• Copper reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is copper carbonate.
(b) Rancidity: The process of oxidation of fats and oils that can be easily noticed by the change in taste and smell is known as rancidity.
For example, the taste and smell of butter changes when kept for long. Rancidity can be avoided by:
• Storing food in air tight containers
• Adding antioxidants
• Storing food in an environment of nitrogen
Nitrogen is an inert gas (at room temperature) and does not easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. When oxygen iRead more
Nitrogen is an inert gas (at room temperature) and does not easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided.
Write a balanced chemical equation with state symbols for the following reactions.
(i) BaCl₂(aq)+Na2SO₄(aq) → BaSO₄(s) +2NaCl(aq) (ii) NaOH(aq) + HCl(aq) → NaCl(aq)+H₂O(l) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
(i) BaCl₂(aq)+Na2SO₄(aq) → BaSO₄(s) +2NaCl(aq)
(ii) NaOH(aq) + HCl(aq) → NaCl(aq)+H₂O(l)
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
Write the balanced equation for the following chemical reactions.
(i) 𝐻₂ + 𝐶𝑙₂ → 2𝐻𝐶𝑙 (ii) 3𝐵𝑎𝐶𝑙₂ +𝐴𝑙₂(𝑆𝑂₄) ₃ → 3𝐵𝑎𝑆𝑂₄ +2𝐴𝑙𝐶𝑙3 (iii) 2𝑁𝑎 +2𝐻₂𝑂→ 2𝑁𝑎𝑂𝐻+𝐻₂ For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
(i) 𝐻₂ + 𝐶𝑙₂ → 2𝐻𝐶𝑙
(ii) 3𝐵𝑎𝐶𝑙₂ +𝐴𝑙₂(𝑆𝑂₄) ₃ → 3𝐵𝑎𝑆𝑂₄ +2𝐴𝑙𝐶𝑙3
(iii) 2𝑁𝑎 +2𝐻₂𝑂→ 2𝑁𝑎𝑂𝐻+𝐻₂
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
Why Should a magnesium ribbon be cleaned before burning in air?
Magnesium is very reactive metal like (Na, Ca, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (MgO) on its surface. 𝑀𝑔⏟𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚+𝑂₂⏟𝑂𝑥𝑖𝑔𝑒𝑛 → 2𝑀𝑔𝑂⏟ 𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚 𝑂𝑥𝑖𝑑𝑒 This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen.Read more
Magnesium is very reactive metal like (Na, Ca, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (MgO) on its surface.
See less𝑀𝑔⏟𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚+𝑂₂⏟𝑂𝑥𝑖𝑔𝑒𝑛 → 2𝑀𝑔𝑂⏟ 𝑀𝑎𝑔𝑛𝑒𝑠𝑖𝑢𝑚 𝑂𝑥𝑖𝑑𝑒
This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be used for the reaction.
Explain the following terms with one example each.
(a) Corrosion: Corrosion is defined as a process where materials, usually metals, deteriorate as a result of a chemical reaction with air, moisture, chemicals, etc. • Iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide (a brown flaky substance) called rust. • Silver artRead more
(a) Corrosion: Corrosion is defined as a process where materials, usually metals, deteriorate as a result of a chemical reaction with air, moisture, chemicals, etc.
• Iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide (a brown flaky substance) called rust.
• Silver articles become black after some time when exposed to air. This is because it reacts with sulphur in the air to form a coating of silver sulphide.
• Copper reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is copper carbonate.
(b) Rancidity: The process of oxidation of fats and oils that can be easily noticed by the change in taste and smell is known as rancidity.
For example, the taste and smell of butter changes when kept for long. Rancidity can be avoided by:
• Storing food in air tight containers
• Adding antioxidants
• Storing food in an environment of nitrogen
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/
Oil and fat containing food items are flushed with nitrogen. Why?
Nitrogen is an inert gas (at room temperature) and does not easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. When oxygen iRead more
Nitrogen is an inert gas (at room temperature) and does not easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-1/