52639 + Interview Questions in Secondary School in Chemistry

1.	How many litres of oxygen at STP at required to burn completely 2.2 gram of propane
Answer» Answer: 5.4 GRAM of OXYGEN at ASTP OS REQUITED

1.

How many litres of oxygen at STP at required to burn completely 2.2 gram of propane

Answer»

Answer:

5.4 GRAM of OXYGEN at ASTP OS REQUITED

Discussion

2.	Suppose it rained in your area and u remove your shoes and hold them in your hands and fold your drees .Are these changes reversible?
Answer» YES,of COURSE these CHANGES are REVERSIBLE

2.

Suppose it rained in your area and u remove your shoes and hold them in your hands and fold your drees .Are these changes reversible?

Answer»

YES,of COURSE these CHANGES are REVERSIBLE

Discussion

3.	Does atmospheric pressure affect boiling point of liquid?explain.
Answer» Answer: As ELEVATION increases, atmospheric pressure decreases because air is less dense at HIGHER altitudes. Because the atmospheric pressure is lower, the VAPOUR pressure of the liquid needs to be lower to reach boiling point. Therefore, less heat is REQUIRED to make the vapour pressure equal to the atmospheric

3.

Does atmospheric pressure affect boiling point of liquid?explain.

Answer»

Answer:

As ELEVATION increases, atmospheric pressure decreases because air is less dense at HIGHER altitudes. Because the atmospheric pressure is lower, the VAPOUR pressure of the liquid needs to be lower to reach boiling point. Therefore, less heat is REQUIRED to make the vapour pressure equal to the atmospheric

Discussion

4.	How are sublimable solids seperated from non-sublimable solids
Answer» ANSWER: EXPLANATION: They are separated by the process of Sublimation Cover the mixture with a funnel and HEAT it. The sublimable solid will sublimate and GET COLLECTED on the funnel

4.

How are sublimable solids seperated from non-sublimable solids

Answer»

ANSWER:

EXPLANATION:

They are separated by the process of Sublimation

Cover the mixture with a funnel and HEAT it.

The sublimable solid will sublimate and GET COLLECTED on the funnel

Discussion

5.	What are the latest compounds created using periodical table of elements which are useful to mankind
Answer» Answer: CALLED Atom2Vec, the program LEARNED to DISTINGUISH between different atoms after analysing a list of CHEMICAL compound names from an ONLINE database.

5.

What are the latest compounds created using periodical table of elements which are useful to mankind

Answer»

Answer:

CALLED Atom2Vec, the program LEARNED to DISTINGUISH between different atoms after analysing a list of CHEMICAL compound names from an ONLINE database.

Discussion

6.	How chemistry improves the world?background
Answer» Answer: CHEMISTRY improve the world BYE it helps in chemical formulas chemical equations and MANY TYPES of experiments developed our country ALSO

6.

How chemistry improves the world?background

Answer»

Answer:

CHEMISTRY improve the world BYE it helps in chemical formulas chemical equations and MANY TYPES of experiments developed our country ALSO

Discussion

7.	Why an atom combines with an other atoms or molecules
Answer» Answer: They WANT to ATTACH with each other because they want a perfect STRUCTURE by FULL filing their outermost shell by ELECTRONS.

7.

Why an atom combines with an other atoms or molecules

Answer»

Answer:

They WANT to ATTACH with each other because they want a perfect STRUCTURE by FULL filing their outermost shell by ELECTRONS.

Discussion

8.	Write the name and molecular formula of an alkyne having four carbon atoms
Answer» C4H6 is a alkyne CONTAINING 4 CARBON ATOMS

8.

Write the name and molecular formula of an alkyne having four carbon atoms

Answer»

C4H6 is a alkyne CONTAINING 4 CARBON ATOMS

Discussion

9.	Iupac name of [Co(NH3)5Cl]No3
Answer» ANSWER: hii your answer is here ! EXPLANATION: pentaamminechlor idocobalt (\|\|\|) DICHLORIDE ! FOLLOW me !

9.

Iupac name of [Co(NH3)5Cl]No3

Answer»

ANSWER:

hii

your answer is here !

EXPLANATION:

pentaamminechlor idocobalt (|||) DICHLORIDE !

FOLLOW me !

Discussion

10.	Anhydrous HCL is for conductor while aqueous HCL is excellent conductor
Answer» ANSWER: HEAT is a CONDUCTOR of ELECTRICITY

10.

Anhydrous HCL is for conductor while aqueous HCL is excellent conductor

Answer»

ANSWER:

HEAT is a CONDUCTOR of ELECTRICITY

Discussion

11.	Give two examples each of an insoluble base and a soluble base.dicestive system
Answer» Explanation: They are INSOLUBLE and POLYMERIC in NATURE. During digestion different ENZYMES helps in breakdown of these complex POLYMERS into soluble monomers which.

11.

Give two examples each of an insoluble base and a soluble base.dicestive system

Answer»

Explanation:

They are INSOLUBLE and POLYMERIC in NATURE. During digestion different ENZYMES helps in breakdown of these complex POLYMERS into soluble monomers which.

Discussion

12.	oxygen helps in burning and hydrogen burns but when we add hydrogen and oxygen they forms H2o how can it stops burning
Answer» Answer:O2 has different CHEMICAL properties that support burning and HYDROGEN has properties due to which it burns. Explanation:But water is a NEW compound that is H2O. When 2 substances react to form a new compound they loose their chemical properties. Hence water does not support burning

12.

oxygen helps in burning and hydrogen burns but when we add hydrogen and oxygen they forms H2o how can it stops burning

Answer»

Answer:O2 has different CHEMICAL properties that support burning and HYDROGEN has properties due to which it burns.

Explanation:But water is a NEW compound that is H2O. When 2 substances react to form a new compound they loose their chemical properties. Hence water does not support burning

Discussion

13.	Why an atom combines with other atoms or molecules?
Answer» Answer: They have ELECTROSTATIC ATTRACTION between them. Explanation: We know that they'll COMBINE together to get various COMPOUNDS.. EVERY atom wants to get stable.

13.

Why an atom combines with other atoms or molecules?

Answer»

Answer:

They have ELECTROSTATIC ATTRACTION between them.

Explanation:

We know that they'll COMBINE together to get various COMPOUNDS..

EVERY atom wants to get stable.

Discussion

14.	Why did Mendlesham leave some gap in his periodic table
Answer» ANSWER: Because of DISCOVERIES of some NEW elements will happen in future.

14.

Why did Mendlesham leave some gap in his periodic table

Answer»

ANSWER:

Because of DISCOVERIES of some NEW elements will happen in future.

Discussion

15.	Iupac name of [Co(NH3)3No3]Cl2
Answer» aquachlorobis(ethylenediamine)cobalt(III) dichloride Explanation: the metal CO is cobalt. the ligands are “en” (ethylenediamine), H2O (aqua), and Cl- (chloro) Put the ligands in alphabetical order, then the metal name: aqua-chloro-ethylenediamine-cobalt There are two ethylenediamine ligands “(en)2” so use the prefix bis to indicate two of them (not di, SINCE “ethylenediamine” already contains a NUMERICAL prefix). So we have aquachlorobis(ethylenediamine)cobalt… The oxidation number of cobalt is +3, so use the Stock number (III), which is the corresponding ROMAN numeral. The overall charge of the complex is +2: positive, so do not add “ate” to the metal name. Then, using the name of the complex cation, name the ionic compound: aquachlorobis(ethylenediamine)cobalt(III) dichloride. The “di” in “dichloride” is not strictly necessary, since (as in CALCIUM chloride) it is implied by the charge of the cation.

15.

Iupac name of [Co(NH3)3No3]Cl2

Answer»

aquachlorobis(ethylenediamine)cobalt(III) dichloride

Explanation:

the metal CO is cobalt.

the ligands are “en” (ethylenediamine), H2O (aqua), and Cl- (chloro)

Put the ligands in alphabetical order, then the metal name: aqua-chloro-ethylenediamine-cobalt

There are two ethylenediamine ligands “(en)2” so use the prefix bis to indicate two of them (not di, SINCE “ethylenediamine” already contains a NUMERICAL prefix).

So we have aquachlorobis(ethylenediamine)cobalt…

The oxidation number of cobalt is +3, so use the Stock number (III), which is the corresponding ROMAN numeral.

The overall charge of the complex is +2: positive, so do not add “ate” to the metal name.

Then, using the name of the complex cation, name the ionic compound: aquachlorobis(ethylenediamine)cobalt(III) dichloride. The “di” in “dichloride” is not strictly necessary, since (as in CALCIUM chloride) it is implied by the charge of the cation.

Discussion

16.	Write a formula of salt.. I need quick answer plz plz plz
Answer» Answer: LEASE MARK AS BRAINLIEST. The molecular formula of table salt, which is SODIUM chloride, is NaCl. Table salt is an ionic compound, which BREAKS into its component ions or dissociates in water. These ions are Na+ and Cl-. The sodium and chlorine atoms are present in equal AMOUNTS (1:1 RATIO), arranged to form a cubic crystal lattice. HOPE IT HELPS YOU

16.

Write a formula of salt.. I need quick answer plz plz plz

Answer»

Answer:

LEASE MARK AS BRAINLIEST.

The molecular formula of table salt, which is SODIUM chloride, is NaCl. Table salt is an ionic compound, which BREAKS into its component ions or dissociates in water. These ions are Na+ and Cl-. The sodium and chlorine atoms are present in equal AMOUNTS (1:1 RATIO), arranged to form a cubic crystal lattice.

HOPE IT HELPS YOU

Discussion

17.	Calculate number of moles of hydrogen in 0.448 litre of hydrogen gas at STP
Answer» No. of MOLES = (GIVEN VOLUME)/22.4 = 0.448/22.4 = 0.02moles

17.

Calculate number of moles of hydrogen in 0.448 litre of hydrogen gas at STP

Answer»

No. of MOLES = (GIVEN VOLUME)/22.4

= 0.448/22.4 = 0.02moles

Discussion

18.	WHY DOES HEAT INCREASE THE RATE OF A REACTION
Answer» ANSWER: heat INCREASES the rate of reaction as it increases the SPEED at which the ATOMS move Explanation:

18.

WHY DOES HEAT INCREASE THE RATE OF A REACTION

Answer»

ANSWER:

heat INCREASES the rate of reaction as it increases the SPEED at which the ATOMS move

Explanation:

Discussion

19.	Express the following sum to appropriate number of significant figures:a.2.3× 103 ML+4.22×104ML+9.04×103ML+8.71×105MLb.319.5g - 20460g -0.0639 g -45.645g -4.173g
Answer» Answer : $9.2\times 10^5mL$ (a) The answer will be $-20190g$ (b) The answer will be Explanation : Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific DEGREE of accuracy is KNOWN as significant digits. The rule apply for the addition and subtraction is : The LEAST precise number present after the DECIMAL point determines the number of significant figures in the answer. (a) The sum of the measured values are, $(2.3\times 10^3mL)+(4.22\times 10^4mL)+(9.04\times 10^3mL)+(8.71\times 10^5mL)$ $\Rightarrow 9.2\times 10^5mL$ In the given expression, $(2.3\times 10^3)$ has 2 significant figures, $(4.22\times 10^4)$ has 3 significant figures, $(9.04\times 10^3)$ has 3 significant figures and $(8.71\times 10^<klux>5</klux>)$ has 3 significant figures. From this we conclude that least precise number present after the decimal point is 1. Thus, the answer will be $9.2\times 10^5mL$ (a) The sum of the measured values are, $319.5g-20460g-0.0639g-45.645g-4.173g$ $\Rightarrow -20190g$ In the given expression, 319.5 has 4 significant figures, 20460 has 5 significant figures, 0.0639 has 3 significant figures, 45.645 has 5 significant figures and 4.173 has 4 significant figures. From this we conclude that least precise number present after the decimal point is 0. Thus, the answer will be $-20190g$

19.

Express the following sum to appropriate number of significant figures:a.2.3× 103 ML+4.22×104ML+9.04×103ML+8.71×105MLb.319.5g - 20460g -0.0639 g -45.645g -4.173g

Answer»

Answer :

$9.2\times 10^5mL$ (a) The answer will be

$-20190g$ (b) The answer will be

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific DEGREE of accuracy is KNOWN as significant digits.

The rule apply for the addition and subtraction is :

The LEAST precise number present after the DECIMAL point determines the number of significant figures in the answer.

(a) The sum of the measured values are,

$(2.3\times 10^3mL)+(4.22\times 10^4mL)+(9.04\times 10^3mL)+(8.71\times 10^5mL)$

$\Rightarrow 9.2\times 10^5mL$

In the given expression, $(2.3\times 10^3)$ has 2 significant figures, $(4.22\times 10^4)$ has 3 significant figures, $(9.04\times 10^3)$ has 3 significant figures and $(8.71\times 10^<klux>5</klux>)$ has 3 significant figures. From this we conclude that least precise number present after the decimal point is 1.

Thus, the answer will be $9.2\times 10^5mL$

(a) The sum of the measured values are,

$319.5g-20460g-0.0639g-45.645g-4.173g$

$\Rightarrow -20190g$

In the given expression, 319.5 has 4 significant figures, 20460 has 5 significant figures, 0.0639 has 3 significant figures, 45.645 has 5 significant figures and 4.173 has 4 significant figures. From this we conclude that least precise number present after the decimal point is 0.

Thus, the answer will be $-20190g$

Discussion

20.	Resonance structure of acetate ion
Answer» Explanation: RESONANCE occurs when the electrons are transferred through neighboring -systems. The GIVEN ion is ACETATE ion and it has TWO resonance structures. The resonance structures of the acetate ion is given below in the IMAGE attached.

20.

Resonance structure of acetate ion

Answer»

Explanation:

RESONANCE occurs when the electrons are transferred through neighboring -systems. The GIVEN ion is ACETATE ion and it has TWO resonance structures. The resonance structures of the acetate ion is given below in the IMAGE attached.

Discussion

21.	. Calculate the molecular mass of of NH3 in g and amu...plz help...
Answer» Answer: MASS is AMU = 14+1+1+1 = 17amu mass in gram = 17 × 1.67 × 10^(-24) gram

21.

. Calculate the molecular mass of of NH3 in g and amu...plz help...

Answer»

Answer:

MASS is AMU = 14+1+1+1 = 17amu

mass in gram = 17 × 1.67 × 10^(-24) gram

Discussion

22.	What is the ratio of molecules in 1 mole of NH3 and 1mole of NHO3?
Answer» ANSWER: 17:63 is the answer...............

22.

What is the ratio of molecules in 1 mole of NH3 and 1mole of NHO3?

Answer»

ANSWER:

17:63 is the answer...............

Discussion

23.	Mass And Weigh Differences
Answer» ANSWER:To understand the differences we need to COMPARE a few points: 1) MASS is a measurement of the AMOUNT of matter something contains, while WEIGHT is the measurement of the pull of gravity on an object. 2) Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Explanation:

23.

Mass And Weigh Differences

Answer»

ANSWER:To understand the differences we need to COMPARE a few points: 1) MASS is a measurement of the AMOUNT of matter something contains, while WEIGHT is the measurement of the pull of gravity on an object. 2) Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter.

Explanation:

Discussion

24.	Why concentrated h2so4 has high boiling point
Answer» Answer: because it exists in nature LIKE that only .we cannot DEFINE or explained

24.

Why concentrated h2so4 has high boiling point

Answer»

Answer:

because it exists in nature LIKE that only .we cannot DEFINE or explained

Discussion

25.	Writ down the limination of soaps
Answer» Answer: you can FIND your answer BRAINLY APP is useless of time LIST is useless of timers or whatever it does

25.

Writ down the limination of soaps

Answer»

Answer:

you can FIND your answer BRAINLY APP is useless of time LIST is useless of timers or whatever it does

Discussion

26.	Write a balanced chemical equation for the formation of nitric oxide during a thunderstorm
Answer» ANSWER: PLEASE MARK as BRAINLIST answer please..

26.

Write a balanced chemical equation for the formation of nitric oxide during a thunderstorm

Answer»

ANSWER:

PLEASE MARK as BRAINLIST answer please..

Discussion

27.	What is term used to describe the phase change of a liquid to gas
Answer» ANSWER: EVAPORATION or VAPORISATION

27.

What is term used to describe the phase change of a liquid to gas

Answer»

ANSWER:

EVAPORATION or VAPORISATION

Discussion

28.	- 12. Give reasons(a) Platinum, gold and silver areused to make jewellery.(b) Sodium, potassium andlithium are stored under oil.Aluminium is a highly reactivemetal, yet it is used to makeutensils for cooking.(d) Carbonate and sulphide oresare usually converted intooxides during the process ofextraction.
Answer» Answer: (a)Because they all have property of malleablity,DUCTILITY and lustrous by which they can be beaten and molded according to us. (b)Because they are HIGHLY reactive metals which will react vigorously with air and water. so they2are kept in oil (c)Because aluminium is light in weight and when it react with air it FORMS layer of oxides around it which prevents aluminium and utensil from getting corroded (d)Because it is easier to obtain metals from it's oxides as COMPARED to carbonate and sulphide ores HOPE YOU LIKE MY ANSWER!!

28.

- 12. Give reasons(a) Platinum, gold and silver areused to make jewellery.(b) Sodium, potassium andlithium are stored under oil.Aluminium is a highly reactivemetal, yet it is used to makeutensils for cooking.(d) Carbonate and sulphide oresare usually converted intooxides during the process ofextraction.

Answer»

Answer:

(a)Because they all have property of malleablity,DUCTILITY and lustrous by which they can be beaten and molded according to us.

(b)Because they are HIGHLY reactive metals which will react vigorously with air and water. so they2are kept in oil

(c)Because aluminium is light in weight and when it react with air it FORMS layer of oxides around it which prevents aluminium and utensil from getting corroded

(d)Because it is easier to obtain metals from it's oxides as COMPARED to carbonate and sulphide ores

HOPE YOU LIKE MY ANSWER!!

Discussion

29.	Explain the formation of a chemical bond
Answer» ANSWER: I HOPE this answer is HELPFUL for you

29.

Explain the formation of a chemical bond

Answer»

ANSWER:

I HOPE this answer is HELPFUL for you

Discussion

30.	After electrolysis, the width of two electrodes change. why?
Answer» Answer: because, of the displacement of particles of one eledrode to another or ADDITION of ions of the electrolytes to either electrode. EXPLANATION: hope it will help you

30.

After electrolysis, the width of two electrodes change. why?

Answer»

Answer:

because, of the displacement of particles of one eledrode to another or ADDITION of ions of the electrolytes to either electrode.

EXPLANATION:

hope it will help you

Discussion

31.	Explain how art and craft was an important industry in the indus valley civilization
Answer» ANSWER: Art and craft was an IMPORTANT industry in the Indus valley civilization because enough evidences are present which suggest the presence of SPECIALISED groups of ARTISANS such as bronze smiths, gold-smiths, brick-makers , stone-cutters, weavers ETC. Objects of gold are reasonably common .

31.

Explain how art and craft was an important industry in the indus valley civilization

Answer»

ANSWER:

Art and craft was an IMPORTANT industry in the Indus valley civilization because enough evidences are present which suggest the presence of SPECIALISED groups of ARTISANS such as bronze smiths, gold-smiths, brick-makers , stone-cutters, weavers ETC. Objects of gold are reasonably common .

Discussion

32.	Which of the following pair is not isoelectronic---
Answer» ANSWER: (d) is the answer.... PLEASE MARK me as a BRAINLEIST...

32.

Which of the following pair is not isoelectronic---

Answer»

ANSWER:

(d) is the answer....

PLEASE MARK me as a BRAINLEIST...

Discussion

33.	D. If the valence shell electronicconfiguration is ns2np5, the element willbelong toa. alkali metalsb. halogensc. alkaline earth metalsd. actinides
Answer» If the VALENCE shell electronic configuration is ns2np5, the element will belong to HALOGENS.

33.

D. If the valence shell electronicconfiguration is ns2np5, the element willbelong toa. alkali metalsb. halogensc. alkaline earth metalsd. actinides

Answer»

If the VALENCE shell electronic

configuration is ns2np5, the element will belong to HALOGENS.

Discussion

34.	16. Write the IUPAC name of:i) CH3-CH2-CH-CH2-CH2-CH3CH3
Answer» ANSWER: The IUPAC NAME of the GIVEN COMPOUND is 3-methylhexane.

34.

16. Write the IUPAC name of:i) CH3-CH2-CH-CH2-CH2-CH3CH3

Answer»

ANSWER: The IUPAC NAME of the GIVEN COMPOUND is 3-methylhexane.

Discussion

35.	5..Nsk)In the equation A=sp. cond. XV, If V is the volumein cc containing 1 equivalent of the electrolyte thenCubicentimetreV for a io solution will be :(1) 10 c.c.(2) 100 c.c.(3) 1000 c.c.(4) 10,000 c.c.
Answer» Answer: 3) HOPE it will HELP you PLEASE FOLLOW me

35.

5..Nsk)In the equation A=sp. cond. XV, If V is the volumein cc containing 1 equivalent of the electrolyte thenCubicentimetreV for a io solution will be :(1) 10 c.c.(2) 100 c.c.(3) 1000 c.c.(4) 10,000 c.c.

Answer»

Answer:

3)

HOPE it will HELP you PLEASE FOLLOW me

Discussion

36.	Color of dil.hcl in universal indicator
Answer» $\text{[math]}$ $\text{[math]}$ $\huge{\boxed{\boxed{HEY}}}$ $\text{[math]}$ $\bold\<klux>RED</klux>{♡FollowMe♡}$ $\text{[math]}$ $\huge\underline\mathscr{Answer}$ $\text{[math]}$ Red The colour of dilute HCL is red on ph PAPER(universal INDICATOR) Ph-0 Acidic in nature. $\text{[math]}$ ♡♡H●P£.. ¡T.. H£LP$ ♡♡

36.

Color of dil.hcl in universal indicator

Answer»

$\text{[math]}$

$\huge{\boxed{\boxed{HEY}}}$

$\text{[math]}$

$\bold\<klux>RED</klux>{♡FollowMe♡}$

$\text{[math]}$

$\huge\underline\mathscr{Answer}$

$\text{[math]}$

Red

The colour of dilute HCL is red on ph PAPER(universal INDICATOR)

Ph-0

Acidic in nature.

$\text{[math]}$

♡♡H●P£.. ¡T.. H£LP$ ♡♡

Discussion

37.	The physical state of a substance which has melting point below room temperature
Answer» Answer: Gas or vapour. Hope it helps If the answer is helpful please MARK it as the BRAINLIEST

37.

The physical state of a substance which has melting point below room temperature

Answer»

Answer:

Gas or vapour.

Hope it helps

If the answer is helpful please MARK it as the BRAINLIEST

Discussion

38.	The oxidation number of Pt in (Pt(C2H4)CI3)- is :
Answer» Answer: +2 Explanation: Let the oxidation state pt is x C2H4 is a neutral ligand x+0+(-3)=-1 x-3=-1 x=-1+3 x=+2

38.

The oxidation number of Pt in (Pt(C2H4)CI3)- is :

Answer»

Answer:

+2

Explanation:

Let the oxidation state pt is x

C2H4 is a neutral ligand

x+0+(-3)=-1

x-3=-1

x=-1+3

x=+2

Discussion

39.	Define ionization energy. Name thefactors on which ionisation energydepends? How does it vary down thegroup and across a period?
Answer» EXPLANATION: The energy needed to remove ONE or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the CHEMICAL behavior of the atom. By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the GAS phase.

39.

Define ionization energy. Name thefactors on which ionisation energydepends? How does it vary down thegroup and across a period?

Answer»

EXPLANATION:

The energy needed to remove ONE or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the CHEMICAL behavior of the atom. By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the GAS phase.

Discussion

40.	What is a supersaturated solution
Answer» Answer: A *solution* in which no more solute can be dissolved at the TEMPERATURE , is called SATURATED solution... for ex saturated solution of idoine chloride..... fallow me plzz KOI fallow** kr do!!!!!!!;

40.

What is a supersaturated solution

Answer»

Answer:

A solution in which no more solute can be dissolved at the TEMPERATURE , is called SATURATED solution... for ex saturated solution of idoine chloride.....

fallow me plzz KOI fallow kr do!!!!!!!;

Discussion

41.	Is iron nails combustible or non combustible
Answer» ANSWER: IRON nails REACT with oxygen and follow slow COMBUSTION.

41.

Is iron nails combustible or non combustible

Answer»

ANSWER:

IRON nails REACT with oxygen and follow slow COMBUSTION.

Discussion

42.	What are three type of transfering heat and write their definition? Give some examples of each type. Answer write please
Answer» Answer: conduction convection radiation Explanation: CONDUCTION: Conduction occurs when two object at different TEMPERATURES are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. example:A radiator is a good example of conduction. CONVECTION: the MOVEMENT CAUSED within a fluid by the tendency of hotter and therefore less dense MATERIAL to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. example:ICE melting - Heat moves to the ice from the air. RADIATION : radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. example:ultraviolet light from the sun.

42.

What are three type of transfering heat and write their definition? Give some examples of each type. Answer write please

Answer»

Answer:

conduction

convection

radiation

Explanation:

CONDUCTION:

Conduction occurs when two object at different TEMPERATURES are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.

example:A radiator is a good example of conduction.

CONVECTION:

the MOVEMENT CAUSED within a fluid by the tendency of hotter and therefore less dense MATERIAL to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

example:ICE melting - Heat moves to the ice from the air.

RADIATION :

radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.

example:ultraviolet light from the sun.

Discussion

43.	Which of the following has max no. of molecules?7g N22g H28g O2
Answer» 7g of N2 COZ, molecular mass of 1 g O2 = 16amu H2 = 1amu N2 = 14amu... THEREFORE , 7g of N2 will have more mass #sumedhian❤❤

43.

Which of the following has max no. of molecules?7g N22g H28g O2

Answer»

7g of N2

COZ,

molecular mass of 1 g O2 = 16amu

H2 = 1amu

N2 = 14amu...

THEREFORE , 7g of N2 will have more mass

#sumedhian❤❤

Discussion

44.	Which of the following has smallest radius - cationor parent atom
Answer» ANSWER: cation Explanation: bcz cation is formed after REMOVING ELECTRON from patent atom. thus attraction between electron and nucleus (effective nuclear charge)increases . so atom SHRINK

44.

Which of the following has smallest radius - cationor parent atom

Answer»

ANSWER:

cation

Explanation:

bcz cation is formed after REMOVING ELECTRON from patent atom.

thus attraction between electron and nucleus (effective nuclear charge)increases .

so atom SHRINK

Discussion

45.	6. Orthouitropnenol is
Answer» It is centrifation swer: EXPLANATION:

45.

6. Orthouitropnenol is

Answer»

It is centrifation

swer:

EXPLANATION:

Discussion

46.	3Calculate the a total noa nutson in IngbloftatalCanmuss1.
Answer» ANSWER: don't KNOW ANSWERS PLEASE

46.

3Calculate the a total noa nutson in IngbloftatalCanmuss1.

Answer»

ANSWER:

don't KNOW ANSWERS PLEASE

Discussion

47.	How can we conserve fossil fuels
Answer» ANSWER: To conserve fossil fuels , reduce your use of plastic items and recycle or REPURPOSE the plastic items you do use . you can easily conserve energy by replacing the in candescent LIGHT bulbs in your home with energy - EFFICIENT LED bulbs and by turning off lights and small appliances when you ' re not using them.

47.

How can we conserve fossil fuels

Answer»

ANSWER:

To conserve fossil fuels , reduce your use of plastic items and recycle or REPURPOSE the plastic items you do use . you can easily conserve energy by replacing the in candescent LIGHT bulbs in your home with energy - EFFICIENT LED bulbs and by turning off lights and small appliances when you ' re not using them.

Discussion

48.	How many elements are in f-block
Answer» Answer: there are maximum 14 ELEMENT in F block . BASICALLY, it contain element having ATOMIC number 57-70 and 89-102. which are transition metals .. HOPE u got.

48.

How many elements are in f-block

Answer»

Answer:

there are maximum 14 ELEMENT in F block .

BASICALLY, it contain element having ATOMIC number 57-70 and 89-102.

which are transition metals

..

HOPE u got.

Discussion

49.	Find the percentage composition of each element in Glucose (C6 H12 O6).
Answer» Answer: %Composition of Carbon = 40%, of oxygen = 53.33% , of HYDROGEN = 6.67% EXPLANATION: To find the percentage composition of each element, we need the masses of each individual element and the mass of glucose itself. Mass of carbon = 12g Mass of Hydrogen = 1g Mass of Oxygen = 16g Mass of glucose, is therefore = 126 + 112 + 166 (6 carbons 12g + 12 hydrogens * 1g + 6 oxygens * 16g) = 180g Now, to find percentage composition, we use this formula Percentage composition = (Total weight of element / Weight of compound)100. For carbon, %composition = (72/180)100 = 40% (72 because 126) For hydrogen %composition = (12/180)100 = 6.67% (12 because 112) For oxygen %composition = (96/180)100 = 53.33% (96 because 16*6) Adding them up, we see 40+6.67+53.33 = 100.

49.

Find the percentage composition of each element in Glucose (C6 H12 O6).

Answer»

Answer:

%Composition of Carbon = 40%, of oxygen = 53.33% , of HYDROGEN = 6.67%

EXPLANATION:

To find the percentage composition of each element, we need the masses of each individual element and the mass of glucose itself.

Mass of carbon = 12g

Mass of Hydrogen = 1g

Mass of Oxygen = 16g

Mass of glucose, is therefore = 12*6 + 1*12 + 16*6 (6 carbons * 12g + 12 hydrogens * 1g + 6 oxygens * 16g) = 180g

Now, to find percentage composition, we use this formula

Percentage composition = (Total weight of element / Weight of compound)*100.

For carbon,

%composition = (72/180)*100 = 40% (72 because 12*6)

For hydrogen

%composition = (12/180)*100 = 6.67% (12 because 1*12)

For oxygen

%composition = (96/180)*100 = 53.33% (96 because 16*6)

Adding them up, we see 40+6.67+53.33 = 100.

Discussion

50.	Now a days what replaced coal tar
Answer» BITUMEN, a PETROLEUM PRODUCT.

50.

Now a days what replaced coal tar

Answer»

BITUMEN, a PETROLEUM PRODUCT.

Discussion

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