Tags Chemistry

Chemistry

Get insights from 6.9k questions on Chemistry, answered by students, alumni, and experts. You may also ask and answer any question you like about Chemistry

Follow Ask Question

6.9k

Questions

Discussions

Active Users

Followers

New answer posted

9 months ago

Chemistry Chemistry Organic Chemistry

Consider the following chemical reaction.

$H C \equiv C H \to_{2) C O, H C l, A l C l_{3}}^{1) R e d h o t F e t u b e, 873 K} P r o d u c t$

The number of sp² hybridized carbon atoms (s) present in the product is--------------.

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

0 0

New answer posted

9 months ago

Chemistry Class 12th

Using the provided information in the following paper chromatogram: Fig : Paper chromatography for compounds A and B. The calculated R_f value of A------------* 10^-1.

0 Follower 6 Views

Vishal Baghel

Contributor-Level 10

$R_{f} v a l u e = \frac{D i s t a n c e m o v e d b y s u b s t a n c e f r o m b a s e l i n e}{D i s t a n c e m o v e d b y t h e s o l v e n t f r o m b a s e l i n e} = \frac{2}{5} = 0.4 = 4.0 * 1 0^{- 1}$

0 0

New answer posted

9 months ago

Chemistry Thermodynamics

The ionization enthalpy of Na⁺ formation from Na_(g)is 495.8 kJ mol^-1, while the electron gain enthalpy of Br is - 325.0 kJ mol^-1. Given the lattice enthalpy of NaBr is - 728.4 kJ mol^-1. The energy for the formation of NaBr ionic solid is (-) -------------- * 10^-1kJ mol^-1.

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

0 0

New answer posted

9 months ago

Chemistry Class 11th

A car tyre is filled with nitrogen gas at 35 psi at 27°C. It will burst if pressure exceeds 40 psi. The temperature in °C at which the car tyre will burst is--------------. (Rounded – off to the nearest integer)

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}} \Rightarrow \frac{35}{300} = \frac{40}{T_{2}}$

$∴ T_{2} = \frac{40 * 300}{35} = 342.85 K$

$T_{2} (° C) = 69.707 \approx 70 ° C$

0 0

New answer posted

9 months ago

Chemistry Chemistry Solutions

1 molal aqueous solution of an electrolyte A₂B₃ is 60% ionized. The boiling point of the solution at 1 atm is----------- K. (Rounded – off to the nearest integer)

[Given K_b for (H₂O) = 0.52 K kg mol^-1]

0 Follower 17 Views

Vishal Baghel

Contributor-Level 10

$A_{2} B_{3} ? 2 A^{+ 3} + 3 B^{- 2}$

123

$∴ i = 1 + 4 α = 1 + 4 * 0.6 = 1 + 2.4 = 3.4$

$Δ T_{b} = i k_{b} m = 3.4 * 0.52 * 1 = 1.768 \approx 1.77 K$

$T_{b} = 374.77 K \approx 375 K .$

0 0

New answer posted

9 months ago

Chemistry Thermodynamics

The reaction of cyanamide, NH₂CN_(s) with oxygen was run in a bomb calorimeter and $Δ U$ was found to be -742.24 kJ mol^-1. The magnitude of $Δ H_{298}$ for the reaction

$N H_{2} C N_{(S)} + \frac{3}{2} O_{2 (g)} \to N_{2 (g)} + O_{2 (g)} + H_{2} O_{(I)} i s$ ------------- kJ. (Rounded off to the nearest integer)

[Assume ideal gases and R = 8.314 J mol^-1 K^-1]

0 Follower 6 Views

Vishal Baghel

Contributor-Level 10

$Δ U = - 742.24 k J / m o l e Δ H_{298} = ?$

NH₂CN (s) + $\frac{3}{2}$ O₂ (g) ® N₂ (g) + O₂ (g) + H₂O (l)

= $- 742.24 + \frac{1}{2} * \frac{8.314}{1000} * 298$

$- 742.24 + 1.238 = - 741.002 \approx - 741 k J / m o l$

So, magnitude of $Δ H$ = 741 kJ/mol.

0 0

New answer posted

9 months ago

Chemistry Chemistry Chemical Kinetics

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half – life of 3.33 h at 25°C. After 9h, the fraction of sucrose remaining is f. The value of log_{10
$(\frac{1}{f})$} is………………….* 10^-2. (Rounded off to the nearest integer)

[Assume: In 10 = 2.303, In2 = 0.693]

0 Follower 5 Views

Vishal Baghel

Contributor-Level 10

$C_{12} H_{22} O_{11} + H_{2} O \to \underset{G l u c o s e}{C_{6} H_{12} O_{6}} + \underset{F r u c t o s e}{C_{6} H_{12} O_{6}}$

$K = \frac{2.303}{t} l o g \frac{a}{a - x}$

$\frac{k t}{2.303} = l o g \frac{a}{a - x}$

$\frac{l n 2 * 9}{\frac{10}{3} * 2.303} = l o g (\frac{1}{f})$

$l o g (\frac{1}{f}) = 81.24 * 1 0^{- 2} = 81 * 1 0^{- 2}$

0 0

New answer posted

9 months ago

Chemistry Class 12th

The total number of amines among the following which can be synthesized by Gabriel synthesis is………………

0 Follower 5 Views

Vishal Baghel

Contributor-Level 10

Gabriel phthalimide synthesis is used for 1° Aliphatic /alicyclic amine

0 0

New answer posted

9 months ago

Chemistry Chemistry Chemical Kinetics

Gaseous cyclobutene isomerizes to butadiene in a first order process which has 'k' value of 3.3 * 10^-4 s^-1 at 153°C. The time in minutes it takes for the isomerization to proceed 40% to completion at this temperature is______ (Rounded off the nearest integer)

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

K = 3.3 * 10^-4 s^-1

Time for 40% completion ; t

Using $K = \frac{2.303}{t} l o g_{10} \frac{{[R]}_{0}}{[R]}$

3.3 * 10^-4 = $\frac{2.303}{t} l o g_{10} \frac{{[R]}_{0}}{0.6 {[R]}_{0}}$

$t = \frac{2.303}{3.3} * 1 0^{4} * 0.22 \Rightarrow t = 25.58 m i n s$

so; the nearest integer is 26.

0 0

New answer posted

9 months ago

Chemistry Class 12th

The coordination number of an atom in a body- centred cubic structure is___________.

[Assume that the lattice is made up of atoms]

0 Follower 1 View

Vishal Baghel

Contributor-Level 10

Coordination no. of an atom in BCC is 8.

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
700k Reviews
1850k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Chemistry

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience