State two reasons to justify that air is a mixture and water is compound. -Chemistry

State two reasons to justify that air is a mixture and water is compound. -Chemistry
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Answer :

  Air is a mixture because: 1. It contains two or more pure substances. 2. By physical processes, it can be separated into a simpler substance. 3. Its composition is not fixed. Water is a compound because: 1. Its composition is fixed and inseparable. 2. It has a definite formula and present in a proportion by mass.
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Give reasons for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. -Chemistry

Description : Give reasons for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. -Chemistry

Last Answer : Answer. (a) Carbon forms large number of compounds since carbon is small in size and can form stable covalent bonds (catenation) and it shows tetravalency. (b) Air holes of gas burner are ... not get blackened. (c) Some synthetic detergents are non-biodegradable, therefore, cause pollution of water.

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Description : 12.Few iron filings and a pinch of sulphur powder are taken in a china dish and mixed properly. Justify the change, giving two points as physical/chemical change. -Chemistry

Last Answer : It is a physical change as if we will bring the magnet near it all the iron fillings will attract towards it. Hence it shows the properties of it constituents are present so, no new substance is formed. Therefore, it is a physical change .

“We need to balance a skeltal chemical equation.” Give reason to justify the statement. -Chemistry

Description : “We need to balance a skeltal chemical equation.” Give reason to justify the statement. -Chemistry

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State the condition for using the method of centrifugation to separate contents of a mixture.State the principle involved in this process. -Chemistry

Description : State the condition for using the method of centrifugation to separate contents of a mixture.State the principle involved in this process. -Chemistry

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Description : 8.Distinguish among soda water, milk and muddy water in a tabular form under the following heads : (i)Stability (ii)Filterability (iii)Type of mixture (iv) Tyndall effect -Chemistry

Last Answer : Here is the answer ..Sorry for bad handwriting...Hope it helps....They contain different types of minerals To achieve different tastes, club soda, sparkling, and tonic water cont A) homogeneity: ... . ... The main difference between the two is that tonic water also contains quinine and sweeteners.

Air is - (1) Compound (2) Element (3) Mixture (4) Solution

Description : Air is - (1) Compound (2) Element (3) Mixture (4) Solution

Last Answer : (3) Mixture Explanation: Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.

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Description : Distinguish between homogeneous and heterogeneous mixture. -Chemistry

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State any three reasons to justify that LPG is considered as an ideal fuel. -Science

Description : State any three reasons to justify that LPG is considered as an ideal fuel. -Science

Last Answer : LPG is considered as an ideal fuel because It is easy to store, handle and transport. It produces large amount of heat on burning. It does not leave any residue on burning,

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Description : When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex (ii) IUPAC name of the complex -Chemistry

Last Answer : i) Complex so formed is: CoCl3.6NH3 + AgNO3 → [Co(NH3)6]Cl3 (ii) IUPAC name of complex is: Hexaamminecobalt (III) chloride

When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex. (ii) IUPAC name of the complex. -Chemistry

Description : When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex. (ii) IUPAC name of the complex. -Chemistry

Last Answer : (i) The complex formed on mixing a coordination compound CrCl3.6H2O with AgNO3 is as follows CrCl3.6H2O + AgNO3 → [Cr(H2O5)Cl]Cl2. H2O (ii) Pentaaquachloridochromium (III) chloride monohydrate

How is the stability of a co-ordination compound in solution decided ? How is the dissociation constant of a complex defined? -Chemistry

Description : How is the stability of a co-ordination compound in solution decided ? How is the dissociation constant of a complex defined? -Chemistry

Last Answer : Stability of a complex in solution means the measure of resistance to the replacement of a ligand by some other ligand. This stablility can be expressed in terms of equilibrium constant. Let the ... is its tendency to donate electron pair and therefore, more is the stability of the complex.

Write the IUPAC name of the following coordination compound [NiCl4]2-. -Chemistry

Description : Write the IUPAC name of the following coordination compound [NiCl4]2-. -Chemistry

Last Answer : Tetrachloridonickelate (II) ion.

(a) Explain the formation of ionic compound CaO with electron dot structure. Atomic number of calcium and oxygen are 20 and 8 respectively. (b) Name the constituent metals of bronze. -Chemistry

Description : (a) Explain the formation of ionic compound CaO with electron dot structure. Atomic number of calcium and oxygen are 20 and 8 respectively. (b) Name the constituent metals of bronze. -Chemistry

Last Answer : (b) Bronze is made up of copper and tin

(a) Write electron dot diagram for chlorine (At No. 17) and calcium (At No. 20). Show the formation of calcium chloride by transfer of electrons. (b) Identify the nature of above compound’and explain three physical properties of such compound. -Chemistry

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Last Answer : (b) It is ionic compound. Physical properties 1.It is hard and solid. 2.It has high melting and boiling point. 3.It soluble in water.

Give three reasons to justify the need to conserve water. -Geography

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why air is a mixture and water is a compound?

Description : why air is a mixture and water is a compound?

Last Answer : Air is composed of many different gases that are not chemicallycombined and retain their individual properties. Water is acompound because it is composed of two hydrogen atoms chemicallybonded to an ... and the properties of water are differentfrom the properties of the elements hydrogen and oxygen.

India’s position in the Indian Ocean is paramount. Give two reasons to justify the given statement. -Geography

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Last Answer : Indian Ocean is the only ocean in the world which has been named after a country (India), this is the biggest proof of the prominence enjoyed by India in early days when oceans were given their names. ... via Indian Ocean, no other country has as a long a coast line on this ocean as India has.

“The modem means of irrigation are gaining popularity.” Give two reasons to justify this statement. -Geography

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“Roadways are an important means of transport in India”. Give two reasons to justify the statement. -Geography

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‘The Iron and Steel industry constitutes the backbone of modem industrial economy.’ Give two reasons to justify the statement. -Geography

Description : ‘The Iron and Steel industry constitutes the backbone of modem industrial economy.’ Give two reasons to justify the statement. -Geography

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Bio gas is an excellent fuel. Justify the statement by giving two reasons. Mention the main constituents of bio gas along with its percentage. -Biology

Description : Bio gas is an excellent fuel. Justify the statement by giving two reasons. Mention the main constituents of bio gas along with its percentage. -Biology

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While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.

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What is majoritarianism? Is it wrong if a majority community in a country rules? Give reasons to justify your answer -Democratic 10th

Description : What is majoritarianism? Is it wrong if a majority community in a country rules? Give reasons to justify your answer -Democratic 10th

Last Answer : A belief that the majority community should be able to rule a country in whichever way it wants, by disregarding the wishes and needs of the minority is majoritarianism. Yes, it is wrong if ... such inequalities sometimes takes the path of conflict and defiance of State power as in Sri Lanka.

“Planning of resources is very important for a country like India”. Justify by giving three reasons. -SST 10th

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“The diverse flora and fauna of India is under threat”. Justify by giving reasons. -SST 10th

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“Multipurpose projects have failed to achieve the purpose for which they were built”. Justify by giving reasons. -SST 10th

Description : “Multipurpose projects have failed to achieve the purpose for which they were built”. Justify by giving reasons. -SST 10th

Last Answer : (i) These dams were constructed to control floods but they have triggered floods due to sedimentation in the reservoir. (ii) Moreover, the big dams have mostly been unsuccessful in controlling floods ... . (iii) Many a time authorities are forced to release water from dams during heavy rainfall.

Three reasons to justify why the Lok Sabha -SST 10th

Description : Three reasons to justify why the Lok Sabha -SST 10th

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The Legal Framework Order of August 2002 in Pakistan was non- democratic in nature.'Justify by giving suitable reasons. -Civics 9th

Description : The Legal Framework Order of August 2002 in Pakistan was non- democratic in nature.'Justify by giving suitable reasons. -Civics 9th

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The Legal Framework Order of August 2002 in Pakistan was non- democratic in nature.'Justify by giving suitable reasons. -Civics 9th

Description : The Legal Framework Order of August 2002 in Pakistan was non- democratic in nature.'Justify by giving suitable reasons. -Civics 9th

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What reasons were used by Monroe to justify this foreign policy pronouncement and how do they relate to arguments made during the revolutionary and early republic periods?

Description : What reasons were used by Monroe to justify this foreign policy pronouncement and how do they relate to arguments made during the revolutionary and early republic periods?

Last Answer : You need to do this question.We don't do homework and yourteacher is looking for your critical thinking skills and how wellyou understood the lesson.

Is one of the reasons the terrorist group Alleged uses to justify committing acts of terrorism against the US?

Description : Is one of the reasons the terrorist group Alleged uses to justify committing acts of terrorism against the US?

Last Answer : Need answer

Justify the reasons for using current sources in integrated circuits.

Description : Justify the reasons for using current sources in integrated circuits.

Last Answer : (i) Superior insensitivity of circuit performance to power supply variations and temperature.  (ii) More economical than resistors in terms of die area required to provide bias currents of ... the high incremental resistance of current source results in high voltage gain at low supply voltages.

Statement: Valve Cooling is necessary in some I. C. Engine. Justify the statement by giving reasons and explain its working with sketch.

Description : Statement: Valve Cooling is necessary in some I. C. Engine. Justify the statement by giving reasons and explain its working with sketch.

Last Answer : Reasons: Exhaust valve temperature in modern engine is as high as 750˚C. Thus cooling of exhaust gas becomes very important. Cooling water jackets are arranged near the valves for valve cooling. In many ... given to cooler stem as it falls back to stem again. This keeps the valve head cool.  

(3) prevents freezing of petrol Explanation: Ethylene glycol (IUPAC name: ethane-1,2-diol) is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is an odorless, colourless, syrupy, sweettasting liquid. Ethylene glycol is toxic, and ingestion can result in death. Due to its low freezing point ethylene glycol resists freezing. A mixture of 60% ethylene glycol and 40% water freezes at -45 degree C (- 49 degree F).

Description : (3) prevents freezing of petrol Explanation: Ethylene glycol (IUPAC name: ethane-1,2-diol) is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is ... A mixture of 60% ethylene glycol and 40% water freezes at -45 degree C (- 49 degree F).

Last Answer : Rust is - (1) A mixture of Fe₂O₃ and Fe(OH) ₂ (2) A mixture of FeO and Fe(OH)₂ (3) FeO only (4) A mixture of Fe₂O₃, 3H₂O and FeO

State the type of chemical reactions and chemical equations that take place in the following: (i) Magnesium wire is burnt in air. (ii) Electric current is passed through water. (iii) Ammonia and hydrogen chloride gases’are mixed. -Chemistry

Description : State the type of chemical reactions and chemical equations that take place in the following: (i) Magnesium wire is burnt in air. (ii) Electric current is passed through water. (iii) Ammonia and hydrogen chloride gases’are mixed. -Chemistry

Last Answer : This is the Answer:

Why a mixture is an impure substance? -Chemistry 9th

Description : Why a mixture is an impure substance? -Chemistry 9th

Last Answer : A mixture is an impure substance. It consists of different elements and substances combined together physically in an unknown ratio. Mostly mixtures are heterogenous. Their constituents are not combined chemically ... freezing point. All these properties of a mixture make it an "Impure substance".

Which of the following is/are optically inactive? (a) a 50-50 mixture of R and S enantiomers (b) a meso compound (c) a racemic mixture (d) all the above

Description : Which of the following is/are optically inactive? (a) a 50-50 mixture of R and S enantiomers (b) a meso compound (c) a racemic mixture (d) all the above

Last Answer : all the above

Which one of the folling is also khow as solution ? (1) A compound (2) A homogeneous mixture (3) A heterogeneous mixture (4) A suspension

Description : Which one of the folling is also khow as solution ? (1) A compound (2) A homogeneous mixture (3) A heterogeneous mixture (4) A suspension

Last Answer : A homogeneous mixture

.Identify the physical and chemical changes from the following (i)Burning of magnesium in air (ii)Electrolysis of water (iii)Tarnishing of silver spoon (iv)Sublimation of iodine -Chemistry

Description : .Identify the physical and chemical changes from the following (i)Burning of magnesium in air (ii)Electrolysis of water (iii)Tarnishing of silver spoon (iv)Sublimation of iodine -Chemistry

Last Answer : (i) Burning of magnesium in air : Chemical change (ii) Tarnishing of silver spoon : Chemical change (iii) Sublimation of iodine : Physical change (iv) Electrolysis of water to form hydrogen and oxygen is also a chemical change.

Write balanced equations for the reaction of: (i) aluminium when heated in air. Write the name of the product. (ii) iron with steam. Name the product obtained. (iii) calcium with water. Why does calcium start floating in water? -Chemistry

Description : Write balanced equations for the reaction of: (i) aluminium when heated in air. Write the name of the product. (ii) iron with steam. Name the product obtained. (iii) calcium with water. Why does calcium start floating in water? -Chemistry

Last Answer : The bubbles of hydrogen stick to the surface of metal that is why it floats.

what- houston is using a balance in his chemistry class. There are ten 1-gram weights and an unknown weight of a solid compound on the left side. There are twelve 1-gram weights on the right side.?

Description : what- houston is using a balance in his chemistry class. There are ten 1-gram weights and an unknown weight of a solid compound on the left side. There are twelve 1-gram weights on the right side.?

Last Answer : houston writes the following equation to represent this situation:10 + q = 12Houston takes ten 1-gram weights off each side.Which property of equality does this represent?answer: subtraction property of equality

Give scientific reasons (in not more than four lines each) for the following: (i) Meat takes longer to cook on the mountains (ii) Water remains cool in earthen pitchers (iii) Ice and salt mixture is used as a freezing agent by manual ice cream makers. (iv) It is not advisable to sleep under trees during the night. (v) Greenhouse operators paint their glass roofs white in summer.

Description : Give scientific reasons (in not more than four lines each) for the following: (i) Meat takes longer to cook on the mountains (ii) Water remains cool in earthen pitchers (iii) Ice and salt ... to sleep under trees during the night. (v) Greenhouse operators paint their glass roofs white in summer.

Last Answer : (i) Meat takes longer to cook on the mountains: The atmospheric pressure decreases as the altitude increases. The boiling point of water is 100 c at standard atmospheric pressure. At the mountains this ... of light to a maximum. And therefore white colour is painted on the roofs in the summer.

A metal ‘X’ acquires a green colour coating on its surface on exposure to air. (i) Identify the metal ‘X’ and name the process responsible for this change. (ii)Name and write chemical formula of the green coating formed on the metal. (iii) List two important methods to prevent the process. -Chemistry

Description : A metal X' acquires a green colour coating on its surface on exposure to air. (i) Identify the metal X' and name the process responsible for this change. (ii)Name and write chemical ... the green coating formed on the metal. (iii) List two important methods to prevent the process. -Chemistry

Last Answer : (i) Metal is copper. The process is corrosion. (ii)Basic copper carbonate [CuCO3.Cu(0H)2]. (iii) • It should be coated with tin • It should be mixed with other metals to form alloys.

Write chemical equation reactions taking place when carried out with the help of (a) Iron reacts with steam (b) Magnesium reacts with dil HCl (c) Copper is heated in air. -Chemistry

Description : Write chemical equation reactions taking place when carried out with the help of (a) Iron reacts with steam (b) Magnesium reacts with dil HCl (c) Copper is heated in air. -Chemistry

Last Answer : This is the Answer.

Is water a compound or heterogeneous mixture or homogeneous mixture?

Description : Is water a compound or heterogeneous mixture or homogeneous mixture?

Last Answer : It is a homogenous mixture

Select the one which is not a mixture – (1) Air (2) Gasoline (3) LPG (4) Distilled water

Description : Select the one which is not a mixture – (1) Air (2) Gasoline (3) LPG (4) Distilled water

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Select the one which is not a mixture : (1) Air (2) Gasoline (3) LPG (4) Distilled water

Description : Select the one which is not a mixture : (1) Air (2) Gasoline (3) LPG (4) Distilled water

Last Answer : Distilled water

A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by

Description : A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by

Last Answer : A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating ... mixture contains : A. B. C. D.