52639 + Interview Questions in Secondary School in Chemistry

1.	Which product obtain when formaldehyde reacts with sodium bisulphate
Answer» ANSWER: SODIUM bisulfite can be prepared by bubbling excess SULFUR dioxide through a SOLUTION of suitable base, such as sodium HYDROXIDE or sodium bicarbonate.

1.

Which product obtain when formaldehyde reacts with sodium bisulphate

Answer»

SODIUM bisulfite can be prepared by bubbling excess SULFUR dioxide through a SOLUTION of suitable base, such as sodium HYDROXIDE or sodium bicarbonate.

Discussion

2.	135 mL of a gas is collected over water at 25°C and 0.993 bar. if the gas weighs 0.160 grams and aqueous tension is is 0.0317 calculate the molar mass of the gas.
Answer» ANSWER: The molar mass of the gas is 30.108 mol/gms. Explanation: We have given that P = 0.993 - 0.0317 P = 0.9613 bar = 0.9487 atm T = 25°C = 273 + 25 = 298K, V =135 ml = 0.135 ltr R is a universal constant. So, R = 0.0821 ltr/mol $No.\ of\ moles(n) = \dfrac{mass\ of\ gas(w)}{molar\ mass\ of\ gas(m)}$ mass of gas = 0.16 We have to find molar mass of gas: We KNOW that PV = NRT $PV = \dfrac wm RT$ $0.9487 \times 0.135 =\dfrac {0.16}m \times 0.0821 \times 298\\\\m = \dfrac {0.16\times 0.0821 \times 298}{0.9487 \times 0.135} = \dfrac{3.914}{0.13}= 30.108 mol/gms$ The molar mass of the gas is 30.108 mol/gms.

2.

135 mL of a gas is collected over water at 25°C and 0.993 bar. if the gas weighs 0.160 grams and aqueous tension is is 0.0317 calculate the molar mass of the gas.

Answer»

ANSWER:

The molar mass of the gas is 30.108 mol/gms.

Explanation:

We have given that

P = 0.993 - 0.0317

P = 0.9613 bar = 0.9487 atm

T = 25°C = 273 + 25 = 298K, V =135 ml = 0.135 ltr

R is a universal constant. So,

R = 0.0821 ltr/mol

$No.\ of\ moles(n) = \dfrac{mass\ of\ gas(w)}{molar\ mass\ of\ gas(m)}$

mass of gas = 0.16

We have to find molar mass of gas:

We KNOW that

PV = NRT

$PV = \dfrac wm RT$

$0.9487 \times 0.135 =\dfrac {0.16}m \times 0.0821 \times 298\\\\m = \dfrac {0.16\times 0.0821 \times 298}{0.9487 \times 0.135} = \dfrac{3.914}{0.13}= 30.108 mol/gms$

The molar mass of the gas is 30.108 mol/gms.

Discussion

3.	Two oxides of an element E containing 10.86% and 19.60% of oxygen respectively are known. A new unstable oxide of the element is reported. one group of workers reports an oxygen content of 13.99% and another group reports a value of 16.67%. which of these values is more likely to be correct?
Answer» Explanation: I THINK element E...... KEEP LOVING....❤❤❤❤✌

3.

Two oxides of an element E containing 10.86% and 19.60% of oxygen respectively are known. A new unstable oxide of the element is reported. one group of workers reports an oxygen content of 13.99% and another group reports a value of 16.67%. which of these values is more likely to be correct?

Answer»

Explanation:

I THINK element E......

KEEP LOVING....❤❤❤❤✌

Discussion

4.	What Is IONIZATION ?Briefly ?
Answer» Answer: IONIZATION is the ENERGY REQUIRED to REMOVE an ELECTRON from a element

4.

What Is IONIZATION ?Briefly ?

Answer»

Answer:

IONIZATION is the ENERGY REQUIRED to REMOVE an ELECTRON from a element

Discussion

5.	A gaseous mixture containing 50g of nitrogen and 10g of oxygen are enclosed in a vessel of 10 L capacity at 27°C. Calculate:- i) number of moles of each gas ii) partial pressure of each gas iii) total pressure of the gaseous mixture
Answer» ANSWER: PLS SEE the ATTACHMENT

5.

A gaseous mixture containing 50g of nitrogen and 10g of oxygen are enclosed in a vessel of 10 L capacity at 27°C. Calculate:- i) number of moles of each gas ii) partial pressure of each gas iii) total pressure of the gaseous mixture

Answer»

ANSWER:

PLS SEE the ATTACHMENT

Discussion

6.	Write the electronic configuration of Li2 and write which is more stable Li2-,Li2+,Li2
Answer» SIGMA 1s^2. sigma* 1s^2. sigma 2s^2 EXPLANATION: STABLE= LI2> Li-2>Li+2

6.

Write the electronic configuration of Li2 and write which is more stable Li2-,Li2+,Li2

Answer»

SIGMA 1s^2. sigma* 1s^2. sigma 2s^2

EXPLANATION:

STABLE= LI2> Li-2>Li+2

Discussion

7.	Define erythre and threo with examples?
Answer» Answer: Erythro 500 MG Tablet is a macrolide antibiotic which is used to treat infections of the LUNGS, THROAT, EAR, etc. caused by bacteria. Two OLDER PREFIXES still commonly used to distinguish diastereomers are threo and erythro.

7.

Define erythre and threo with examples?

Answer»

Answer:

Erythro 500 MG Tablet is a macrolide antibiotic which is used to treat infections of the LUNGS, THROAT, EAR, etc. caused by bacteria.

Two OLDER PREFIXES still commonly used to distinguish diastereomers are threo and erythro.

Discussion

8.	Do molecules always form by sharing of electrons ?
Answer» ANSWER: no , MOLECULES forms by COVALENT BOND, ionic & coordinate bond

8.

Do molecules always form by sharing of electrons ?

Answer»

ANSWER:

no , MOLECULES forms by COVALENT BOND, ionic & coordinate bond

Discussion

9.	Why do metals do not form any molecule??
Answer» ANSWER: because METAL's are NON CORROSIVE

9.

Why do metals do not form any molecule??

Answer»

ANSWER:

because METAL's are NON CORROSIVE

Discussion

10.	आयन इलक्ट्रान विधि द्वारा निम्नालाखत रडाक्स आभाक्रयाआ का सतुालत काजए-(क) MnO (aq) + I (aq) → MnO, (s) + I,(s) (क्षारीय माध्यम)
Answer» ANSWER: bahuth ACHA FO you no to TYPE in ENGLISH

10.

आयन इलक्ट्रान विधि द्वारा निम्नालाखत रडाक्स आभाक्रयाआ का सतुालत काजए-(क) MnO (aq) + I (aq) → MnO, (s) + I,(s) (क्षारीय माध्यम)

Answer»

ANSWER:

bahuth ACHA FO you no to TYPE in ENGLISH

Discussion

11.	Why does hydrogen extinguish lighted splint?
Answer» ANSWER: HYDROGEN is EASILY ignited, as it is flammable over a wide range of concentrations in air, making this test quite ROBUST. If the GAS is non-flammable, the burning splint will be extinguished. Explanation: hope it will help u mate ☺

11.

Why does hydrogen extinguish lighted splint?

Answer»

ANSWER:

HYDROGEN is EASILY ignited, as it is flammable over a wide range of concentrations in air, making this test quite ROBUST. If the GAS is non-flammable, the burning splint will be extinguished.

Explanation:

hope it will help u mate ☺

Discussion

12.	Find the mass of hundred ml of O2 at ntp
Answer» ANSWER: Explanation WE KNOW THAT, 1 mole of O2 weighs 32g i.e 22400 ml weighs 32g They are asking for 100ML So the answer is :- 32×100/22400 = 1/7 g I hope it helps :)

12.

Find the mass of hundred ml of O2 at ntp

Answer»

ANSWER:

Explanation

WE KNOW THAT,

1 mole of O2 weighs 32g

i.e 22400 ml weighs 32g

They are asking for 100ML

So the answer is :-

32×100/22400

= 1/7 g

I hope it helps :)

Discussion

13.	A vessel has 6 gram Oxygen gas at pressure P and temperature 400K. A hole is made in the vessel and Oxygen gas leaked find out how much amount of Oxygen gas leaked out if final pressure is P/2 and temperature is 300K.
Answer» *Answer:* 2g *Explanation: Given* $P_{1} = P \\ P_{2} = \frac{P}{2} \\ V_{1} = V \\ V_{2} = V \\ T_{1} = 400 \: K \\ T_{2} = 300 \: K$ $\bold{Now, \: we \: need \: n_{1} \: and \: n_{2}}$ $n_{1} = \frac{6}{32} \\ n_{2} = \frac{M}{32}$ *We KNOW that* $\frac{P_{1}V_{1}}{n_{1}T_{1}} = \frac{P_{2}V_{2}}{n_{2}T_{2}}$ *On PUTTING* *all* *the VALUES* $= > \frac{P \times V}{400 \times \frac{6}{32} } = \frac{ \frac{P}{2} \times V}{300 \times \frac{M}{32} }$ $= > \frac{ \cancel{P} \times \cancel{V} \times \cancel{32}}{ 400 \times 6} = \frac{ \cancel{P} \times \cancel{V} \times \cancel{32}}{ 2 \times {300} \times M} \\ = > 2400 = 600M \\ = > M = \frac{ \cancel{2400}}{ \cancel{600}} \\ = > \boxed{M = 4g}$ $\bold{Amount \: of \: leaked \: gas = 6g - 4g} \\ \bold{Amount \: of \: leaked \: gas = 2g}$

13.

A vessel has 6 gram Oxygen gas at pressure P and temperature 400K. A hole is made in the vessel and Oxygen gas leaked find out how much amount of Oxygen gas leaked out if final pressure is P/2 and temperature is 300K.

Answer»

Answer:

2g

Explanation:

Given

$P_{1} = P \\ P_{2} = \frac{P}{2} \\ V_{1} = V \\ V_{2} = V \\ T_{1} = 400 \: K \\ T_{2} = 300 \: K$

$\bold{Now, \: we \: need \: n_{1} \: and \: n_{2}}$

$n_{1} = \frac{6}{32} \\ n_{2} = \frac{M}{32}$

We KNOW that

$\frac{P_{1}V_{1}}{n_{1}T_{1}} = \frac{P_{2}V_{2}}{n_{2}T_{2}}$

On PUTTING all the VALUES

$= > \frac{P \times V}{400 \times \frac{6}{32} } = \frac{ \frac{P}{2} \times V}{300 \times \frac{M}{32} }$

$= > \frac{ \cancel{P} \times \cancel{V} \times \cancel{32}}{ 400 \times 6} = \frac{ \cancel{P} \times \cancel{V} \times \cancel{32}}{ 2 \times {300} \times M} \\ = > 2400 = 600M \\ = > M = \frac{ \cancel{2400}}{ \cancel{600}} \\ = > \boxed{M = 4g}$

$\bold{Amount \: of \: leaked \: gas = 6g - 4g} \\ \bold{Amount \: of \: leaked \: gas = 2g}$

Discussion

14.	What is the IUPAC name
Answer» Answer: IUPAC Name Explanation: The International Union of PURE and Applied CHEMISTRY ( IUPAC) has established the rules of NOMENCLATURE of all chemical COMPOUNDS.

14.

What is the IUPAC name

Answer»

Answer:

IUPAC Name

Explanation:

The International Union of PURE and Applied CHEMISTRY ( IUPAC) has established the rules of NOMENCLATURE of all chemical COMPOUNDS.

Discussion

15.	What is pesci cultu.re
Answer» The breeding rearing and transplantation of FISH by ARTICAL MEAN is called pisciculture . hope HELPFUL

15.

What is pesci cultu.re

Answer»

The breeding rearing and transplantation of FISH by ARTICAL MEAN is called pisciculture .

hope HELPFUL

Discussion

16.	calculate total pressure in a mixture of 8 gram Oxygen and 4 gram hydrogen confined in a vessel of of one 1 dm^3 at 27°C. R= 0.083
Answer» ANSWER: 54atm or 54bar Explanation:

16.

calculate total pressure in a mixture of 8 gram Oxygen and 4 gram hydrogen confined in a vessel of of one 1 dm^3 at 27°C. R= 0.083

Answer»

ANSWER: 54atm or 54bar

Explanation:

Discussion

17.	Is compound ions considered as molecules
Answer» Answer: The MOLECULE is the simplest form of the covalent COMPOUND. There are two types of compounds : covalent andionic. ... No, ionic compounds are crystals of infinite cations and anions BOUND together. There is no “molecule” of ionic compounds such as, for EXAMPLE, NaCl, because there are no single UNITS of the compound.....

17.

Is compound ions considered as molecules

Answer»

Answer:

The MOLECULE is the simplest form of the covalent COMPOUND. There are two types of compounds : covalent andionic. ... No, ionic compounds are crystals of infinite cations and anions BOUND together. There is no “molecule” of ionic compounds such as, for EXAMPLE, NaCl, because there are no single UNITS of the compound.....

Discussion

18.	What is the electronic configuration of og and What are noble gases
Answer» Answer: NOBLE GAS- ELEMENTS which are INERT and unreactive

18.

What is the electronic configuration of og and What are noble gases

Answer»

Answer:

NOBLE GAS- ELEMENTS which are INERT and unreactive

Discussion

19.	Calculate the molarity of a solution prepared by dissolving 50 gram NaOH in hundred ml H2O
Answer» ANSWER: M= 50× 1000/40× 100=50/4= 12.5 M

19.

Calculate the molarity of a solution prepared by dissolving 50 gram NaOH in hundred ml H2O

Answer»

ANSWER:

M= 50× 1000/40× 100=50/4= 12.5 M

Discussion

20.	WHEN STATING THE VOLUME OF THE GAS THE PRESSURE AND THE VOLUME SHOULD ALSO BE GIVEN
Answer» ANSWER: PRESSURE is INVERSELY PROPORTIONAL to VOLUME.........

20.

WHEN STATING THE VOLUME OF THE GAS THE PRESSURE AND THE VOLUME SHOULD ALSO BE GIVEN

Answer»

ANSWER:

PRESSURE is INVERSELY PROPORTIONAL to VOLUME.........

Discussion

21.	9. How will you indicate the following effects in a chemical equation ?(@) A solution made in water(b) Exothermic reaction(c) Endothermic reaction
Answer» Answer: a) A + H2O -----> C (s) (L) (aq) B) A + B ----------> C + ∆ C) A + B + ∆ ----------> C EXPLANATION: (s) is the sign of solid substance (l) is sign of liquid substance (aq) is the sign of solid dissolved in water or aqua solution the sign ∆ represents represents heat in any reaction please follow me on brainly and I will help you in more such questions by PROVIDING notes and helping you in questions

21.

9. How will you indicate the following effects in a chemical equation ?(@) A solution made in water(b) Exothermic reaction(c) Endothermic reaction

Answer»

Answer:

a)

A + H2O -----> C

(s) (L) (aq)

B)

A + B ----------> C + ∆

C)

A + B + ∆ ----------> C

EXPLANATION:

(s) is the sign of solid substance

(l) is sign of liquid substance

(aq) is the sign of solid dissolved in water or aqua solution

the sign ∆ represents represents heat in any reaction

please follow me on brainly and I will help you in more such questions by PROVIDING notes and helping you in questions

Discussion

22.	Hybridization of so3 -2 ???(It's urgent please answer )
Answer» Answer: Explanation: To find hybridisation use this Total valency + no. of MONOVALENT atoms ATTACHED to it +(if NEGATIVE CHARGE) -(it positive charge) /2 In, SO3^-2 H= 6+0+2/2 =4 Since 4 hybrid orbitals then the hybridisation should be SP3

22.

Hybridization of so3 -2 ???(It's urgent please answer )

Answer»

Answer:

Explanation:

To find hybridisation use this

Total valency + no. of MONOVALENT atoms ATTACHED to it +(if NEGATIVE CHARGE) -(it positive charge) /2

In, SO3^-2

H= 6+0+2/2

=4

Since 4 hybrid orbitals then the hybridisation should be SP3

Discussion

23.	Calculate the volume of 0.2 Mol of Sulphur dioxide at STP
Answer» Answer: 1 MOLE ........22.4 L 0.2 mole........22.4× 0.2/1= 4.48 L

23.

Calculate the volume of 0.2 Mol of Sulphur dioxide at STP

Answer»

Answer:

1 MOLE ........22.4 L

0.2 mole........22.4× 0.2/1= 4.48 L

Discussion

24.	What is value of dipole moment if covalent bond has 25%ionic character
Answer» Answer: dipole moment is twice the IONIC CHARACTER.. EXPLANATION: Therefore, 50 is the Answer. *MARK* *BRAINLIST* AND FOLL**OW ME...

24.

What is value of dipole moment if covalent bond has 25%ionic character

Answer»

Answer:

dipole moment is twice the IONIC CHARACTER..

EXPLANATION:

Therefore,

50 is the Answer.

MARK BRAINLIST AND FOLLOW ME...

Discussion

25.	DEFINE pH scale.........
Answer» ANSWER: PH scale Explanation: pH is a scale of acidity from 0 to 14. It tells how acidic or alkaline a SUBSTANCE is. More acidic solutions have lower pH.Acids have a pH that is less than 7. hope it helps

25.

DEFINE pH scale.........

Answer»

ANSWER:

PH scale

Explanation:

pH is a scale of acidity from 0 to 14. It tells how acidic or alkaline a SUBSTANCE is. More acidic solutions have lower pH.Acids have a pH that is less than 7.

hope it helps

Discussion

26.	Which acid is used while making crystal of copper sulphate write its formula
Answer» ANSWER: Suphric ACID and its FORMULA is H2SO4

26.

Which acid is used while making crystal of copper sulphate write its formula

Answer»

ANSWER:

Suphric ACID and its FORMULA is H2SO4

Discussion

27.	4. Solve the following problemsA. Express the following quantities inexponential terms.a. 0.0003498
Answer» ANSWER: 3.498×10^-4 is the answer

27.

4. Solve the following problemsA. Express the following quantities inexponential terms.a. 0.0003498

Answer»

ANSWER:

3.498×10^-4 is the answer

Discussion

28.	13. If Ca3(Po4)2 and H3PO3contains same numberof 'P' atoms then the ratio of oxygen atoms in thesecompounds respectively is:(B)2/13
Answer» Explanation: 1mole H3PO3 contains 1mole of P. 1mole Ca3(PO4)2 contains 2 mole P. As the NUMBER of P ATOMS is same, Ca3(PO4)2 must be 1/2mole. Ratio of Oxygen=(4x1/2x2)/3=4/3.

28.

13. If Ca3(Po4)2 and H3PO3contains same numberof 'P' atoms then the ratio of oxygen atoms in thesecompounds respectively is:(B)2/13

Answer»

Explanation:

1mole H3PO3 contains 1mole of P.

1mole Ca3(PO4)2 contains 2 mole P.

As the NUMBER of P ATOMS is same, Ca3(PO4)2 must be 1/2mole.

Ratio of Oxygen=(4x1/2x2)/3=4/3.

Discussion

29.	Why do atomic spectra arise
Answer» Answer: Answer:Emission and absorption SPECTRA. ... The LINES on the atomic spectrum relate to electron transitions between energy levels, if the electron DROPS an energy level a PHOTON is RELEASED resulting in an emission line and if the electron absorbs a photon and rises an energy level an absorption line is observed on the spectrum. *Hope* it *helped* *you* *Mark* it as *brainlieat*

29.

Why do atomic spectra arise

Answer»

Answer:

Answer:Emission and absorption SPECTRA. ... The LINES on the atomic spectrum relate to electron transitions between energy levels, if the electron DROPS an energy level a PHOTON is RELEASED resulting in an emission line and if the electron absorbs a photon and rises an energy level an absorption line is observed on the spectrum.

Hope it helped you Mark it as brainlieat

Discussion

30.	Give the solution step by step
Answer» Answer: EXPLANATION: USE the FORMULAE : KE = H ( f - fnot)

30.

Give the solution step by step

Answer»

Answer:

EXPLANATION:

USE the FORMULAE : KE = H ( f - fnot)

Discussion

31.	Name the salts whose solubility first increase then decreases with increase in temperature.
Answer» ANSWER: The answer is Na2SO4.10H2O or Glauber's SALT

31.

Name the salts whose solubility first increase then decreases with increase in temperature.

Answer»

ANSWER:

The answer is Na2SO4.10H2O or Glauber's SALT

Discussion

32.	I. Which of the following has the largnumber of atoms?a. lg Au (s) b. 1g Na (s)c. 1g Li (s) d. lg Cl, (g)
Answer» ANSWER: 1g LI is your answer MAN

32.

I. Which of the following has the largnumber of atoms?a. lg Au (s) b. 1g Na (s)c. 1g Li (s) d. lg Cl, (g)

Answer»

ANSWER:

1g LI is your answer MAN

Discussion

33.	Energy of one mole of photons of radiation whosefrequency is 1014 Hz is (h = 6 x 10-34 Js)(N = 6 * 1023)(1) 3.6x 10- J (2) 3.6x10-19 J(3) 3.6 x 104 J (4) 3.6% 1014
Answer» EXPLANATION: i THINK this MUST be the ANSWER I hope u LIKE it plz follow

33.

Energy of one mole of photons of radiation whosefrequency is 1014 Hz is (h = 6 x 10-34 Js)(N = 6 * 1023)(1) 3.6x 10- J (2) 3.6x10-19 J(3) 3.6 x 104 J (4) 3.6% 1014

Answer»

EXPLANATION:

i THINK this MUST be the ANSWER

I hope u LIKE it

plz follow

Discussion

34.	Pls ans the ques1. What do you observe when the litmus paper is dipped?2. Name the product formed when sulphur burns in air. Also give the equation for the above reaction .3.What is the nature of the of compound formed on burning sulphur?
Answer» Answer: 1: the solution CHANGES the colour of red LITMUS to blue Explanation: 2: sulphur dioxide ,s+o2 so2 3: if you born sulphur in the presence of air it react with atmospheric OXYGEN and and form Sulphur dioxide in excess of oxygen IT form sulphur trioxide

34.

Pls ans the ques1. What do you observe when the litmus paper is dipped?2. Name the product formed when sulphur burns in air. Also give the equation for the above reaction .3.What is the nature of the of compound formed on burning sulphur?

Answer»

Answer:

1: the solution CHANGES the colour of red LITMUS to blue

Explanation:

2: sulphur dioxide ,s+o2 so2

3: if you born sulphur in the presence of air it react with atmospheric OXYGEN and and form Sulphur dioxide in excess of oxygen IT form sulphur trioxide

Discussion

35.	All of the following elements are liquids around room temperature except which one?GalliumMagnesiumBromineMercury
Answer» Megnessium Mg BELONGS to alkaline EARTH METAL atomic number 12 it is highly reactive are can't convert into liquid . mercury is used in thermometer because it is liquid at room TEMPERATURE. Gallium is easily melt at room temperature

35.

All of the following elements are liquids around room temperature except which one?GalliumMagnesiumBromineMercury

Answer»

Megnessium

Mg BELONGS to alkaline EARTH METAL atomic number 12 it is highly reactive are can't convert into liquid .

mercury is used in thermometer because it is liquid at room TEMPERATURE.

Gallium is easily melt at room temperature

Discussion

36.	Write the balance chemical equation for the reaction between iron and chlorine
Answer» Answer: The balanced chemical EQUATION for this reaction is: 2 Fe(s) + 3 CL2(g) → 2 FeCl3(s)

36.

Write the balance chemical equation for the reaction between iron and chlorine

Answer»

Answer:

The balanced chemical EQUATION for this reaction is: 2 Fe(s) + 3 CL2(g) → 2 FeCl3(s)

Discussion

37.	The threshold frequency vo for a metal is 8 x 1014 s-1. What is the kinetic energy of an eleemitted having frequency v = 1.0 x 1015 s-1.
Answer» Explanation: by using the FORMULA of PE EFFECT w=w°+ KE ,IMPLIES hv=hv°+KE , V and v° are frequency and threshold frequency respectively , we can calculate KE

37.

The threshold frequency vo for a metal is 8 x 1014 s-1. What is the kinetic energy of an eleemitted having frequency v = 1.0 x 1015 s-1.

Answer»

Explanation:

by using the FORMULA of PE EFFECT w=w°+ KE ,IMPLIES hv=hv°+KE , V and

v° are frequency and threshold frequency respectively , we can calculate KE

Discussion

38.	Calculate the number of moles (n) and molecules present in 3.2×10-2 mg of methane.
Answer» Answer: After you have found the NUMBER of moles of methane (CH4), you should multiply this number by avogadro number (6.022 * 10^23) and you GET the number of molecules. Here is the calculation: N = 8.0 GR / 16.043 gr/mol = 0.499 mol. Number of molecules = 0.499 mol * (6.022 * 10^23 1/mol) = 3.005 * 10^23 molecule

38.

Calculate the number of moles (n) and molecules present in 3.2×10-2 mg of methane.

Answer»

Answer:

After you have found the NUMBER of moles of methane (CH4), you should multiply this number by avogadro number (6.022 * 10^23) and you GET the number of molecules. Here is the calculation: N = 8.0 GR / 16.043 gr/mol = 0.499 mol. Number of molecules = 0.499 mol * (6.022 * 10^23 1/mol) = 3.005 * 10^23 molecule

Discussion

39.	D. oh \|CH3 - CH₂ - CH - CH₂
Answer» Can you UPLOAD FULL QUESTION

39.

D. oh |CH3 - CH₂ - CH - CH₂

Answer»

Can you UPLOAD FULL QUESTION

Discussion

40.	Molecular formula of 6 carbon containing compound
Answer» C6H12O6 is the EXAMPLE of COMPOUND having 6 CARBON

Discussion

41.	A drop of food coloring spreading out in a cup of water is an example of which transport process?
Answer» Answer: Diffusion is the right ONE MATE! Explanation: activity for diffusion : 1.Take a beaker and pour half liter of water . 2.From one side of the beaker pour two drops of Kmno4. 3. you will observe as it spreads all over the water. That spreading in the water is CALLED diffusion This is the EXAMPLE for diffusion . Hope it helps you :) Hey mate please mark my answer as BRAINLEST answer

41.

A drop of food coloring spreading out in a cup of water is an example of which transport process?

Answer»

Answer:

Diffusion is the right ONE MATE!

Explanation:

activity for diffusion :

1.Take a beaker and pour half liter of water .

2.From one side of the beaker pour two drops of Kmno4.

3. you will observe as it spreads all over the water.

That spreading in the water is CALLED diffusion

This is the EXAMPLE for diffusion .

Hope it helps you :)

Hey mate please mark my answer as BRAINLEST answer

Discussion

42.	All of the following are amino acids except
Answer» ANSWER: BUT WHERE IS THE FOLLOWING AVAILABLE

42.

All of the following are amino acids except

Answer»

ANSWER:

BUT WHERE IS THE FOLLOWING AVAILABLE

Discussion

43.	Why metals are good coductor of current?
Answer» Hi BUDDY Good morning Here is your answer METALS are good conductor of current because they OFFER ROW resistivity comparing to NON metal. Hope it help you Please mark me please #sibi

43.

Why metals are good coductor of current?

Answer»

Hi BUDDY

Good morning

Here is your answer

METALS are good conductor of current because they OFFER ROW resistivity comparing to NON metal.

Hope it help you

Please mark me please

#sibi

Discussion

44.	What do you call an atom that has more protons than electrons?
Answer» Cation An atom having more number of atom it means it have more POSITIVE CHARGE then electron too it have but in less number .

44.

What do you call an atom that has more protons than electrons?

Answer»

Cation

An atom having more number of atom it means it have more POSITIVE CHARGE then electron too it have but in less number .

Discussion

45.	CH3-C-CH3 tne name of compound
Answer» ANSWER: NAME of CH3CH2CH3 is PROPANE.

45.

CH3-C-CH3 tne name of compound

Answer»

ANSWER:

NAME of CH3CH2CH3 is PROPANE.

Discussion

46.	A mole contains Avogadro's number of items. What is Avogadro's number?
Answer» ANSWER: HII FRND EXPLANATION: here is UR answer .....

46.

A mole contains Avogadro's number of items. What is Avogadro's number?

Answer»

ANSWER:

HII FRND

EXPLANATION:

here is UR answer .....

Discussion

47.	What are coordination compound
Answer» Answer: In CHEMISTRY, a coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or IONS, that are in turn KNOWN as LIGANDS or complexing agents.[1][2][3] MANY metal-containing compounds, especially those of transition metals, are coordination complexes.[4] A coordination complex whose centre is a metal atom is called a metal complex

47.

What are coordination compound

Answer»

Answer:

In CHEMISTRY, a coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or IONS, that are in turn KNOWN as LIGANDS or complexing agents.[1][2][3] MANY metal-containing compounds, especially those of transition metals, are coordination complexes.[4] A coordination complex whose centre is a metal atom is called a metal complex

Discussion

48.	GIVE A LOOONG, NICE ANSWER. QUESTION IS FOR 5 MARKS IN THE EXAM, BUT YOU'LL GET 98:HOW CAN YOU PROVE THAT AIR IS A MIXTURE?
Answer» Answer: SINCE AIR contains many other gases with many PARTICLES with it like dust, smoke, etc. so we can say that air is a mixture. please MARK it as brainiest

48.

GIVE A LOOONG, NICE ANSWER. QUESTION IS FOR 5 MARKS IN THE EXAM, BUT YOU'LL GET 98:HOW CAN YOU PROVE THAT AIR IS A MIXTURE?

Answer»

Answer:

SINCE AIR contains many other gases with many PARTICLES with it like dust, smoke, etc. so we can say that air is a mixture.

please MARK it as brainiest

Discussion

49.	You can't live without iron. Where in the body is most of the iron located?
Answer» iron is ONE of important part it is large AMOUNT used in BLOOD . iron found in Banana ,milk etc

49.

You can't live without iron. Where in the body is most of the iron located?

Answer»

iron is ONE of important part it is large AMOUNT used in BLOOD .

iron found in Banana ,milk etc

Discussion

50.	Three of the most common states of matter are solids, liquids, and gases. A liquid has:
Answer» Explanation: ♥ The three states of matter are MADE up of TINY particles ♥ they have particular mass and can OCCUPY volume LiqUid:::: ♥ it does not have a particular shape but can take the shape of the container ♥ it has a constant volume no matter what shape it may be ♥ slightly compressable ♥ high density ♥ slow diffusion ♥ low expansion on heating hope it helps u.....❣️

50.

Three of the most common states of matter are solids, liquids, and gases. A liquid has:

Answer»

Explanation:

♥ The three states of matter are MADE up of TINY particles

♥ they have particular mass and can OCCUPY volume

LiqUid::::

♥ it does not have a particular shape but can take the shape of the container

♥ it has a constant volume no matter what shape it may be

♥ slightly compressable

♥ high density

♥ slow diffusion

♥ low expansion on heating

hope it helps u.....❣️

Discussion

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What Is IONIZATION ?Briefly ?

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Write the electronic configuration of Li2 and write which is more stable Li2-,Li2+,Li2

Do molecules always form by sharing of electrons ?

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calculate total pressure in a mixture of 8 gram Oxygen and 4 gram hydrogen confined in a vessel of of one 1 dm^3 at 27°C. R= 0.083

Is compound ions considered as molecules

What is the electronic configuration of og and What are noble gases

Calculate the molarity of a solution prepared by dissolving 50 gram NaOH in hundred ml H2O

WHEN STATING THE VOLUME OF THE GAS THE PRESSURE AND THE VOLUME SHOULD ALSO BE GIVEN

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Give the solution step by step

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What do you call an atom that has more protons than electrons?

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