Malleable Substances that can be converted into thin sheets by beating are called malleable. Most of the metals are malleable. Gold and Silver are most malleable metals. Ductile Substances that can be drawn into thin wires are called ductile. Most of the metals are ductile. Gold is the most ductileRead more
Malleable
Substances that can be converted into thin sheets by beating are called malleable. Most of the metals are malleable. Gold and Silver are most malleable metals.
Ductile
Substances that can be drawn into thin wires are called ductile. Most of the metals are ductile. Gold is the most ductile metal.
(i) Metal that exists in liquid state at room temperature ¨ Mercury (ii) Metal that can be easily cut with a knife ¨ Sodium, Potassium (iii) Metal that is the best conductor of heat ¨ Silver, Gold (iv) Metals that are poor conductors of heat ¨ Mercury and lead For more answers visit to website:Read more
(i) Metal that exists in liquid state at room temperature ¨ Mercury
(ii) Metal that can be easily cut with a knife ¨ Sodium, Potassium
(iii) Metal that is the best conductor of heat ¨ Silver, Gold
(iv) Metals that are poor conductors of heat ¨ Mercury and lead
Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. 3Fe+4H₂o → Fe₃O₄ + 4H₂ That is why copper is used to make hot water tanks,Read more
Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.
3Fe+4H₂o → Fe₃O₄ + 4H₂
That is why copper is used to make hot water tanks, and not steel.
He must have dipped the gold metal in the solution of aqua regia - a 3:1 mixture of conc. HCl and conc. HNO3. Aqua regia is a fuming, highly corrosive liquid. It dissolves gold in it. After dipping the gold ornaments in aqua regia, the outer layer of gold gets dissolved and the inner shiny layer appRead more
He must have dipped the gold metal in the solution of aqua regia – a 3:1 mixture of conc. HCl and conc. HNO3. Aqua regia is a fuming, highly corrosive liquid. It dissolves gold in it. After dipping the gold ornaments in aqua regia, the outer layer of gold gets dissolved and the inner shiny layer appears. That is why the weight of gold ornament reduced.
Metal: 1. Metals are electropositive. 2. They react with oxygen to form basic oxides. 4Na + O₂ → 2Na₂ 0 These have ionic bonds. 3. They react with water to form oxides and hydroxides. Some metals react with cold water, some with hot water, and some with steam. 2𝑁𝑎+2𝐻₂𝑂 → 2𝑁𝑎𝑂𝐻+𝐻₂↑ 3. They react withRead more
Metal:
1. Metals are electropositive.
2. They react with oxygen to form basic oxides. 4Na + O₂ → 2Na₂ 0 These have ionic bonds.
3. They react with water to form oxides and hydroxides. Some metals react with cold water, some with hot water, and some with steam.
2𝑁𝑎+2𝐻₂𝑂 → 2𝑁𝑎𝑂𝐻+𝐻₂↑
3. They react with dilute acids to form a salt and evolve hydrogen gas. However, Cu, Ag, Au, Pt, Hg do not react.
2𝑁𝑎+2𝐻𝐶𝑙 → 2𝑁𝑎𝐶𝑙+𝐻₂↑
4.They react with the salt solution of metals. Depending on their reactivity, displacement reaction can occur.
2𝐶𝑢𝑆𝑂₄+𝑍𝑛 → 𝑍𝑛𝑆𝑂₄+𝐶𝑢
5. They act as reducing agents (as they can easily lose electrons).
Na → Na⁺+e⁻
Non-metals:
1. Non-metals are electronegative.
2. They react with oxygen to form acidic or neutral oxides.
𝐶+𝑂₂ → C0₂ These have covalent bonds.
3. They do not react with water.
4. They do not react with dilute acids. These are not capable of replacing hydrogen.
5. These react with the salt solution of non-metals.
6. These act as oxidising agents (as they can gain electrons).
Cl₂+2e ⁻ →Cl
Explain the meanings of malleable and ductile.
Malleable Substances that can be converted into thin sheets by beating are called malleable. Most of the metals are malleable. Gold and Silver are most malleable metals. Ductile Substances that can be drawn into thin wires are called ductile. Most of the metals are ductile. Gold is the most ductileRead more
Malleable
Substances that can be converted into thin sheets by beating are called malleable. Most of the metals are malleable. Gold and Silver are most malleable metals.
Ductile
Substances that can be drawn into thin wires are called ductile. Most of the metals are ductile. Gold is the most ductile metal.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Give an example of a metal which
(i) Metal that exists in liquid state at room temperature ¨ Mercury (ii) Metal that can be easily cut with a knife ¨ Sodium, Potassium (iii) Metal that is the best conductor of heat ¨ Silver, Gold (iv) Metals that are poor conductors of heat ¨ Mercury and lead For more answers visit to website:Read more
(i) Metal that exists in liquid state at room temperature ¨ Mercury
(ii) Metal that can be easily cut with a knife ¨ Sodium, Potassium
(iii) Metal that is the best conductor of heat ¨ Silver, Gold
(iv) Metals that are poor conductors of heat ¨ Mercury and lead
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. 3Fe+4H₂o → Fe₃O₄ + 4H₂ That is why copper is used to make hot water tanks,Read more
Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.
3Fe+4H₂o → Fe₃O₄ + 4H₂
See lessThat is why copper is used to make hot water tanks, and not steel.
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
He must have dipped the gold metal in the solution of aqua regia - a 3:1 mixture of conc. HCl and conc. HNO3. Aqua regia is a fuming, highly corrosive liquid. It dissolves gold in it. After dipping the gold ornaments in aqua regia, the outer layer of gold gets dissolved and the inner shiny layer appRead more
He must have dipped the gold metal in the solution of aqua regia – a 3:1 mixture of conc. HCl and conc. HNO3. Aqua regia is a fuming, highly corrosive liquid. It dissolves gold in it. After dipping the gold ornaments in aqua regia, the outer layer of gold gets dissolved and the inner shiny layer appears. That is why the weight of gold ornament reduced.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Differentiate between metal and non-metal on the basis of their chemical properties.
Metal: 1. Metals are electropositive. 2. They react with oxygen to form basic oxides. 4Na + O₂ → 2Na₂ 0 These have ionic bonds. 3. They react with water to form oxides and hydroxides. Some metals react with cold water, some with hot water, and some with steam. 2𝑁𝑎+2𝐻₂𝑂 → 2𝑁𝑎𝑂𝐻+𝐻₂↑ 3. They react withRead more
Metal:
1. Metals are electropositive.
2. They react with oxygen to form basic oxides. 4Na + O₂ → 2Na₂ 0 These have ionic bonds.
3. They react with water to form oxides and hydroxides. Some metals react with cold water, some with hot water, and some with steam.
2𝑁𝑎+2𝐻₂𝑂 → 2𝑁𝑎𝑂𝐻+𝐻₂↑
3. They react with dilute acids to form a salt and evolve hydrogen gas. However, Cu, Ag, Au, Pt, Hg do not react.
2𝑁𝑎+2𝐻𝐶𝑙 → 2𝑁𝑎𝐶𝑙+𝐻₂↑
4.They react with the salt solution of metals. Depending on their reactivity, displacement reaction can occur.
2𝐶𝑢𝑆𝑂₄+𝑍𝑛 → 𝑍𝑛𝑆𝑂₄+𝐶𝑢
5. They act as reducing agents (as they can easily lose electrons).
Na → Na⁺+e⁻
Non-metals:
See less1. Non-metals are electronegative.
2. They react with oxygen to form acidic or neutral oxides.
𝐶+𝑂₂ → C0₂ These have covalent bonds.
3. They do not react with water.
4. They do not react with dilute acids. These are not capable of replacing hydrogen.
5. These react with the salt solution of non-metals.
6. These act as oxidising agents (as they can gain electrons).
Cl₂+2e ⁻ →Cl