1.Provide a concrete example of a metal.
Is a liquid piping hot enough to consume?
(ii) Easily cut with a knife?
(iii) is the best heat conductor?
(iv) Is a poor heat conductor?
1.Provide a concrete example of a metal.
Is a liquid piping hot enough to consume?
(ii) Easily cut with a knife?
(iii) is the best heat conductor?
(iv) Is a poor heat conductor?
Explanation :
(I)Mercury is the metal that is liquid at room temperature.
(ii) Sodium and potassium are the only metals that can be cut with a knife.
(iii) Silver is the ideal heat conductor .
(iv) Mercury and lead do not conduct heat well
2.conductor what the terms malleable and ductile mean.
2.conductor what the terms malleable and ductile mean.
Explanation:
Metals are deemed malleable if they can be formed into sheets by being pounded.
The ability to be drawn into fine wires makes a metal ductile.
3.In kerosene oil, why is sodium maintained submerged?
3.In kerosene oil, why is sodium maintained submerged?
Explanation:
the answer is that sodium is a reactive metal. If left wide open, it will react with the oxygen and expand, then ignite. To stop reactions between sodium metal and air’s oxygen, moisture, and carbon dioxide, the metal is kept submerged in kerosene.
4.describe the reactions of in equations
using a steam iron
(ii)Calcium and potassium dissolved in water
4.describe the reactions of in equations
using a steam iron
(ii)Calcium and potassium dissolved in water
Explanation :
(i) Iron and steam react, releasing H2 and creating a magnetic oxide of iron.
3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2 (g)
(ii) Calcium and water undergo a reaction that produces calcium hydroxide and hydrogen.
Ca(s)+2H2O(I) = Ca(OH)2(aq)+H2 (g)
(iii) Potassium strongly and instantly combines with cold water, producing H2 that ignites.
K(s) + H(I) KOH(aq) + H2 (g)
5.Which gas results from the reaction of a reactive metal with diluted hydrochloric acid? When iron and weak H2SO4 react chemically, describe the process in writing.
5.Which gas results from the reaction of a reactive metal with diluted hydrochloric acid? When iron and weak H2SO4 react chemically, describe the process in writing.
Explanation :
When weak HCl is added to a reactive metal, hydrogen gas is released.
H2SO4(aq) + Fe(s) FeSO4(aq) + H2 (g)
6.you see if you added zinc to an iron (II) sulphate solution? Provide a written account of the chemical reaction.
6.you see if you added zinc to an iron (II) sulphate solution? Provide a written account of the chemical reaction.
Explanation :
Because zinc is more electro positive than iron, it is more reactive. Therefore, in its salt solution, zinc takes the role of iron. Iron sulphate first has a light green hue that eventually fades to colorlessness.
Zn + FeSO4 = ZnSO4 + Fe (s)
Sulphate of zinc, which is pale green (Colourless).
7.The high melting points of ionic compounds are for what reason?
7.The high melting points of ionic compounds are for what reason?
Explanation :
The compounds with both positive and negative charges are known as ionic compounds. The attraction between them will therefore be very intense. Because it takes a lot of energy to overcome this force of attraction, ionic compounds have high melting points.
8.Please explain the following terms.
1.the Mineral
2.Ore
3.Gangue
8.Please explain the following terms.
1.the Mineral
2.Ore
3.Gangue
Explanation:
Compounds, or elements, are what are referred to as minerals and are naturally present in the crust of the planet. such as K2SO4 and alums. Al2(SO4)3, 24H2O, etc.
Minerals called ores can be used to extract metal. Example: Bauxite Al2O3. Copper pyrite, or 2H2O, serves as a resource for aluminium. Although not all minerals are regarded as ores, all ores are also minerals.
Sand and rocky elements are naturally present in the earth's ore deposits. The ore contains gangue, which are impure substances.
9.Name two metals that occur naturally in their free states.
Explanation :
10.What chemistry is employed to separate a metal from its oxide?
Explanation :
To separate metal from its oxide, utilise the reduction technique. Ex: Heating with carbon reduces zinc oxide to metallic zinc.
Zn + CO Zn + ZnO + C
Ex: Heating with carbon converts lead oxide to lead.
Pb + CO = PbO + C
11.Which metals are resistant to corrosion?
11.Which metals are resistant to corrosion?
Explanation :
Gold and platinum are two metals that resist corrosion well.
12.Describe alloys.
12.Describe alloys.
Explanation :
That homogenous blend of two or more metals, or a metal and a non-metal, is what is known as an alloy.
13.Which of the following pairs of particles will react by displacing others?
(a)Copper metal and NaCl solution.
(b)MgCl2 solution with metal aluminium.
©Silver metal with FeSO4 solution
(d) Copper metal and an AgNO3 solution
13.Which of the following pairs of particles will react by displacing others?
(a)Copper metal and NaCl solution.
(b)MgCl2 solution with metal aluminium.
©Silver metal with FeSO4 solution
(d) Copper metal and an AgNO3 solution
Explanation :
with right response is option d,
Explanation :
which calls for copper and an AgNO3 solution. Silver cations are replaced by copper, which causes them to oxidise into Copper II cations (Cu2+) and dissolve in solution. This process reduces the silver cations to the elemental metal. As a result, silver metal can be seen precipitating off, leaving behind a copper II nitrate solution.
Cu(s) Cu(NO3)2 (aq) 2AgNO3 (aq) (s)
14.Which of the following techniques is best for preventing rust on an iron frying pan?
Putting grease on.
(ii) Putting paint on.
(iii) Applying a zinc coating.
(iv) All the aforementioned Solutions.
14.Which of the following techniques is best for preventing rust on an iron frying pan?
Putting grease on.
(ii) Putting paint on.
(iii) Applying a zinc coating.
(iv) All the aforementioned Solutions.
Explanation :
Putting a zinc coat on is option ©.
Explanation :
Despite the fact that applying grease and painting iron prevents corrosion, we cannot use these techniques on frying pans. So, the best way to stop an iron pan from rusting is to apply a coat of zinc.
15.Oxygen and an element combine to form a compound with a high melting point. Moreover, this substance dissolves in water. The component is most likely to
1.) Calcium
Carbon
Silicon
Iron
15.Oxygen and an element combine to form a compound with a high melting point. Moreover, this substance dissolves in water. The component is most likely to
1.) Calcium
Carbon
Silicon
Iron
Explanation :
- Option (a) Calcium is the appropriate response.
Explanation :
Calcium oxide is produced when oxygen and calcium react. Water can dissolve calcium oxide to produce calcium hydroxide.
Option B is incorrect since carbon-oxide is formed when oxygen and carbon interact.
Silicon dioxide is created when silicon and oxygen react. Water cannot dissolve this. Thus, option C is incorrect.
Iron dioxide is created when iron combines with oxygen. Water cannot dissolve this. Thus, option D is incorrect.
16.Tin, not zinc, is used as the coating on food cans.
(I).Tin costs less than zinc.
(ii).Zinc melts at a higher temperature than tin.
(iii).In comparison to tin, zinc is more reactive.
(iv).Tin and zinc are both less reactive.
16.Tin, not zinc, is used as the coating on food cans.
(I).Tin costs less than zinc.
(ii).Zinc melts at a higher temperature than tin.
(iii).In comparison to tin, zinc is more reactive.
(iv).Tin and zinc are both less reactive.
Explanation :
C is the solution.
Explanation :
Tin, not zinc, is used to cover food cans becauseelectrically positive, more electro reactive than tin.
17.You are given a switch, wires, a bulb, a battery, and a hammer.
(a).How could you utilise them to tell apart metal samples from non-metal samples?
(b).Evaluate how effective these tests are at differentiating between metals and non-metals
17.You are given a switch, wires, a bulb, a battery, and a hammer.
(a).How could you utilise them to tell apart metal samples from non-metal samples?
(b).Evaluate how effective these tests are at differentiating between metals and non-metals
Explanation :
Metals are easily formed into sheets and can be easily hammered into shape. Non-metals, on the other hand, are non-malleable, and if we beat them, they decompose and cannot be pulled into sheets. When you connect metals with a battery, wire, and bulb, they act as good electrical conductors and light up the bulb. Similar to metals, non-metals that are poor electrical conductors do not light bulbs when connected to wires and battery.
These tests can be used to show how malleable and electrically conductive both metals and non-metals are.
18.How do amphoteric oxides work? Name two amphoteric oxide.
18.How do amphoteric oxides work? Name two amphoteric oxide.
Explanation :
Amphoteric oxides are defined as oxides that react with both acids and bases to produce salt and water. Al2O3 and PbO are two examples.
Salt and water are created when amphoteric oxides combine with both acids and bases. Examples include aluminium oxide (Al2O3) and lead oxide (PbO)
19.List two metals that will remove hydrogen from weak acids and two that won’t.
19.List two metals that will remove hydrogen from weak acids and two that won’t.
Explanation :
Because zinc (Zn) and magnesium (Mg) are very reactive metals, they will both displace hydrogen from weak acids. Due to their lower reactivity, gold (Au) and silver (Ag) cannot replace the hydrogen from diluted acids.
20.What would you use as the anode, cathode, and electrolyte in the electrolytic refining of a metal M?
20.What would you use as the anode, cathode, and electrolyte in the electrolytic refining of a metal M?
Explanation :
A thick, impure block of metal termed “M” is used as the anode in the electrolytic process of purifying it, while a thin strip or wire of pure metal M is used as the cathode. An appropriate metal salt solution
21.On a spatula, Pratyush heated some sulphur powder. He did this by placing a test tube upside down above the developed gas, as seen in the image below.
( A ) .What will the effects of gas on
Is it dry litmus paper?
( ii ) Litmus paper that is wet?
( B ). Create a chemical equation for the reaction that is occurring that is balanced.
21.On a spatula, Pratyush heated some sulphur powder. He did this by placing a test tube upside down above the developed gas, as seen in the image below.
( A ) .What will the effects of gas on
Is it dry litmus paper?
( ii ) Litmus paper that is wet?
( B ). Create a chemical equation for the reaction that is occurring that is balanced.
Explanation :
( A ) .Sulphur-di-oxide is produced when sulphur powder is burned in the air, which is a solution.
Sulfur dioxide has no impact on dry litmus paper.
(ii). Sulfur dioxide, second As SO2 and water come into contact, sulfuric acid is produced, turning moist litmus paper from blue to red.
(b) O2(g) + S(s) = SO2 (g)
H2SO3 is created by adding SO2(g) and water
22.Provide two strategies for preventing iron from rusting.
22.Provide two strategies for preventing iron from rusting.
Explanation:
Applying oil or grease to the surface of iron objects will keep the metal from coming into touch with wet air.
23.What kind of oxides are created when oxygen and non-metals combination
23.What kind of oxides are created when oxygen and non-metals combination
Explanation :
Acidic or neutral oxides are created when non-metals react with oxygen. For instance, CO is a neutral oxide while N2O5 or N2O3 are acidic oxides.
24.Provide explanations
( a ). Jewelry is made from platinum, gold, and silver.
( b ). Oil is used to store lithium, potassium, and sodium.
( c ). Despite being a highly reactive metal, aluminium is utilised to create cooking utensils.
( d ). During the extraction process, oxides are typically formed from carbonate and sulfuric ores.
24.Provide explanations
( a ). Jewelry is made from platinum, gold, and silver.
( b ). Oil is used to store lithium, potassium, and sodium.
( c ). Despite being a highly reactive metal, aluminium is utilised to create cooking utensils.
( d ). During the extraction process, oxides are typically formed from carbonate and sulfuric ores.
Explanation :
(a).Jewelry is made from platinum, gold, and silver since these metals have a very low level of reactivity. They are therefore unaffected by air, water, or the majority of chemicals. These metals are highly corrosion resistant, malleable, and lustrous in addition to being malleable and ductile in nature.
(b). Lithium, sodium, and potassium easily combine with water to generate a lot of heat. Therefore, hydrogen developed in theThey respond to moisture (water droplets) in the air when exposed to water, preventing contact with water. Hence, these metals are kept under oil.
(c). Aluminum develops an oxide-coated, nonreactive surface on its surface. Some substances are prevented from interacting with aluminium by such a coating. Thus, aluminium is employed to create cooking equipment.
(d). The conversion of metal oxide into free metal is simple. Moreover, the carbonate and sulphide ores are first converted to oxides in order to obtain the metals because doing so is easier than getting them directly from their carbonates or sulphides.
25.You've probably seen people using lemon or tamarind juice to clean tarnished copper objects. Why do these acidic substances work so well to clean the vessels?
25.You've probably seen people using lemon or tamarind juice to clean tarnished copper objects. Why do these acidic substances work so well to clean the vessels?
Explanation :
Lemon or tamarind is used to clean tarnished copper vessels because these acidic foods contain coatings of copper oxide or basic copper carbonate that are present on the surface of tarnished copper vessels. They once more shine red-brown as a result. As a result, they work wonders to clean tarnished copper vessels.
26.A man pretended to be a goldsmith and went door to door. He pledged to restore the shiny finish of worn-out, dull gold jewellery. He received a set of gold bangles from an unassuming woman, which he then immersed in a specific liquid. The bangles still sparkled like fresh but were significantly lighter. The woman was outraged, but after a pointless debate, the male hastily left. Can you play detective to determine what kind of remedy he applied?
26.A man pretended to be a goldsmith and went door to door. He pledged to restore the shiny finish of worn-out, dull gold jewellery. He received a set of gold bangles from an unassuming woman, which he then immersed in a specific liquid. The bangles still sparkled like fresh but were significantly lighter. The woman was outraged, but after a pointless debate, the male hastily left. Can you play detective to determine what kind of remedy he applied?
Explanation :
Aqua regia, often known as royal water in Latin, was employed by the goldsmith. It is a 3:1 blend of concentrated nitric acid and concentrated hydrochloric acid. Aqua regia has the ability to dissolveThe upper layer of worn-out gold ornaments dissolves and loses weight.
27.Justify the use of copper rather than steel in the manufacture of hot water tanks (an alloy of iron).
27.Justify the use of copper rather than steel in the manufacture of hot water tanks (an alloy of iron).
Explanation :
Because copper does not react with either water or steam, hot water tanks made of copper are used instead of steel (an alloy of iron), which can corrode the tank when it reacts with steal.
