Answer:
c) There are sharp emission lines demonstrating discrete energy levels.
Explanation:
When an element emits energy in the form of radiation, it produces a spectrum of colors on a photographic plate. This spectrum can either be continuous or discrete. In continuous spectrum the spectrum continues without any discrimination between two regions. This represents the continuous emission of radiation, and thus the continuous emission of energy without any break.
On the other hand, the line spectrum consists of discrete and sharp lines, which shows the emission of radiation in a certain amount in a certain time, with a break between emission. Hence, the line spectra supports the quantization of energy.
The correct option is:
<u>c) There are sharp emission lines demonstrating discrete energy levels.</u>
Answer:
497 ml
Explanation:
(678 ml) x (273 / (25 + 273)) x (0.8 atm / 1 atm) = 497 ml
Number of millimoles of NaOH consumed in present titration =<span>33.23 X 0.09892
= 3.287
Thus, number of millimoles of vinegar present in sample = 3.287
Now, Molarity of vinegar solution = </span>
<span> = </span>
<span> = 0.1222 mol/dm3
Molar concentration of vinegar present in sample solution is 0.1222 M </span>
Answer:
The solution can be prepared by adding 150.0 mL of isopropyl alcohol to 350.0 mL of water to make 30.0% isopropyl alcohol aqueous solution.
Explanation:
∵ The volume% of a solution = [(volume of the solute(isopropy)/(volume of the solution)] x 100.
The volume % = 30.0%, volume of the solution = 500.0 mL.
∴ Volume of the solute = (the volume% of a solution)(volume of the solution)/100 = (30.0%)(500.0 mL)/100 = 150.0 mL.
∵ The volume of solution = volume of the solute + volume of water
∴ Volume of water = volume of the solution - volume of the solute = (500.0 mL) - (350.0 mL) = 150.0 mL.
- <em>So, the solution can be prepared by adding 150.0 mL of isopropyl alcohol to 350.0 mL of water to make 30.0% isopropyl alcohol aqueous solution.</em>
To answer this question, you should first find the volume:7.28 g/ mL x .655 g / v = 0.08997 mL
volume = L x W x H, but thickness is the width. So rearranging the formula, the formula is v / l x h.
The thickness is found after dividing the volume by its length and width:
.08997 / (5.70) (4.25) = .004 cm is the thickness.
