Class 11 Chemistry NCERT Solutions | Gyanam Tuition

[00:00:00]Hello students.

[00:00:12]Some basic concept of chemistry.

[00:00:24]Exercise 1.12 1.12 question if the density of methanol is 0.793 kg per liter what is its volume needed for making 2.5 liter of it 0.25 25 solution 0.25 solution capital Mity Mity 0.2 of moles of solute divided by volume of solution in liter of moles of solute divided by volume of solution.

[00:01:37]0.2 Number of moles of solute number of moles of mass mass mix.

[00:02:22]Number of solute given mass mass Number of moles of solute for number of moles of solute mass mass.

[00:03:47]CH3 CH3 CH3 32 g per CH32 g per mole Fore [clears throat] 2.5 volume of solution.5 solution.5.2.2 25 x 32 x 32.5 by 2.5.2 25 x 32 1 by 2.5.2 sorry 2.5 0.2 multiplication 0.25 252.5.25 into 32.5= X 0.25 into 32 into 2.5 cross multiplication= X into X 0.25 25 into 32 into 2.5 g 0.793 kg per liter 0.73 You dity by volume 0.79 by volume 0.79 93 kass divided by density mass divided by 0.79 volume 0.792 Volume mass divided by 0.793 kg divided by 0.793 kid 0.793 k 0.7 0.7 7 9300.793 into 100,00300 0.02522 02522 L 02522 L 25.2.2.22 is force as force per unit area of the surface. The SI unit of pressure pascal is as shown below. 1 pascal is equal to 1 newton per meter squared of mass of air at sea level is 1,34 g per cm squared. Calculate the pressure ince area.

[00:11:39]134 g per cm squ34 g per cm square 134 g per cm cime square 1 cm square.

[00:12:24]1,34 Guess 134 g cm force area by Are second Masselation due to gravity.

[00:14:03]Gravitational acceleration due to gravity.

[00:14:21]Gravitational acceleration.

[00:14:33]9.8 second square 9.8 second square 9.8 8/ cm.

[00:15:20]Next formula area 134 due to gravity.

[00:15:59]9.8 m 9.8 8 m per second. M second square inverse inverse 1 cm square.

[00:16:33]134.8 m/ second square 9.8 8 square cm square 34 cancel out 134 cancel 134 9.84 into 9.8 1 cm square into second square into square.

[00:17:56]Foreign speech. Foreign speech. Foreign speech.

[00:18:18]One pump.

[00:18:28]for 134 cancel out cancel Gramm square cime 1 cm square 1 cm 10,000 10,000 cm 10,000 cm 1,000 cm square 1 square 1 m square 1 m square 1000 cm square 8 square mem square.

[00:20:37]Same way square cime 1.34 into 9.8 9.8 9.8 into 1 into 1 into 1 into 1 second square into 9.8 8 into 1 3 1 0 1 32 inverse second inverse clear.

[00:22:10]Next question.

[00:22:16]Next question. What is the SI unit of mass? How How is it?

[00:23:29]Simple question.

[00:23:44]Next question. Match the following prefix with their multiples.

[00:23:56]Fore number 10 power 1 10us 15 10 number 10us 15 simple simple Next question.

[00:25:23]What do you mean by significant figures?

[00:25:36]All the certain digits in a measured value together with the plus uncertain digits. Significant figures are all the certain digits in a measured value together with the uncertain.

[00:25:51]Next question.

[00:25:55]Reliable digits uncertain figure 2.62.2.62 CM6 2.6 2.62 62% 2.6 2.6 2.6%.

[00:27:12]100% 2.6 2.6 2.62.6 2.6 Uncertain 2.6 2.62 Reliable 2.6 2.6 2.6.

[00:28:29]Exactly.

[00:28:36]2.6 uncertain digits.

[00:28:57]2.62 2.62 6 26 2.62 62 fig.

[00:29:58]Second 2.6.6.

[00:30:20]Exactly. Exactly.

[00:30:29]2.6.

[00:30:53]Reliable digits plus uncertain digit reliable digit figure 2.6 Clear.

[00:31:20]Next question.

[00:31:57]Express the following in the scientific notation.

[00:32:01]Question number two 0.004 04 0.04 0.04.8 10 power.

[00:33:04]into 10^us 3. Next 2 3 4 2.3 2.34 the power 5 2.34 into 10 2.34 into the power 2.38.8.8 8 right 800 number 5 0.0 into 10 square.

[00:35:09]Number two 6.0012 1 2 6 612 612 612 the 10 Next 1.2 figure.

[00:36:09]significant figure.

[00:36:14]How many significant figures are present in the Significant figure.

[00:36:51]figure number 0.0025 025 025 decimal number First figure number First nonitzig 05 Number 126 0 0 1 2600 0 Nonimal number non-zero digit last non-zero digit first non-zero digit 1 0 5 number decimal Number 0 2.34 34 23 number two last four