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A streak of lightning is a form of electric energy.
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Recrystallization is a separating technique in chemistry in which mixtures are dissolve in appropriate solvent, this leads to the separating out of one of the components of the mixture leaving behind the other component. The technique is used to purify solid substances.
In real life, the technique finds application in re-crystallization of metals.
Answer:
9.45 × 10⁻³ M
Explanation:
Step 1: Given data
- Mass of calcium nitrate (solute): 155 mg (0.155 g)
- Volume of solution: 100. mL (0.100 L)
Step 2: Calculate the moles of solute
The molar mass of Ca(NO₃)₂ is 164.09 g/mol.
0.155 g × 1 mol/164.09 g = 9.45 × 10⁻⁴ mol
Step 3: Calculate the molarity of the solution
The molarity is equal to the moles of solute divided by the liters of solution.
M = 9.45 × 10⁻⁴ mol/0.100 L = 9.45 × 10⁻³ M
Answer:
The gas pressure inside the flask is higher than outside the flask ornthe atmospheric pressure.
Explanation:
Given a U-tube manometer with water in between each arm of U-tube. One end is open to the atmosphere while one end is sealed to a flask filled with a gas. The water in the open end of the tube is experiencing a pressure equal to the atmospheric pressure whereas the water at the end sealed of to the flask is experiencing pressure due to the gas in the flask.
If the water level in both arms of the tube are equal, then the pressure due to the gas is equal to atmospheric pressure.
If the water level in the arm sealed to the gas is higher than that of the open end, The gas pressure is less than the atmospheric pressure.
If the water level in the arm sealed to the flask is lower than the open end, the pressure due to the gas is higher than atmospheric pressure.
From the question, when the water level is higher outside the flask than inside, then the gas pressure inside the flask is higher than the atmospheric pressure.
Answer:-
500324 grams
Explanation:-
Heat absorbed Q = M x Cp x T
We are given T = 10 [ The maximum allowed temperature increase]
Plugging in the values
6.70 x 10^ 6 J = M x 30.8 J / (K mol) x 10 K
M = 6.70 x 10 ^6 / (30.8 x 10)
= 21753 moles
Atomic Mass of sodium =23 gram / mol
Grams of liquid sodium required = 21753 moles x 23 grams / mol
= 500324 grams