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Harlamova29_29 [7]
3 years ago
12

Q3.What did you observe about the wavelengths and frequencies of the different colors of light?

Chemistry
1 answer:
Natalija [7]3 years ago
6 0

Answer:

Explanation:

Q3.What did you observe about the wavelengths and frequencies of the different colors of light?

Q4. Do the frequencies of colors of light increase from red to violet?

Q5. What did you observe about the corresponding energies from red to violet?

wavelength times frequency =c=the speed of light

the higher the frequency, the shorter the wavelength

the different colors of visible  light are our good friend ROY G BIV

RED  ORANGE  YELLOW   GREEN   BLUE   INDIGO   VIOLET

As we go from red to violet, the wavelength decreases and the energy increases because the wave is vibrating at a higher number of vibrations per secomd. This is what "frequency' means, how many vibrations are there per second, how FREQUENT are thee.

the higher the frequency the more energy because the wave is vibrating faster.

the equation that relates this is Energy = h times frequency, where h is

Planck's constant = 6.262 x 10^-27 ERG-SEC

the frequency of vibration and therefor the energy of visible electromagnetic radiation (light) increase as we go across

ROY G BIV

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Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molality of the HCl, if the solution ha
marta [7]

Molality of the solution is defined as the number of moles of a substance dissolved divided by the mass of the solvent:

Molality = number of moles / solvent mass

From the concentration of 39% (by mass) of HCl in water, we construct the following  reasoning:

in 100 g solution we have 39 g hydrochloric acid (HCl)

number of moles  = mass / molecular weight

number of moles of HCl = 39 / 36.5 = 1.07 moles

solvent (water) mass = solution mass - hydrochloric acid mass

solvent (water) mass = 100 - 39 = 61 g

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molality = 1.07 moles / 61 g = 0.018

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3 years ago
Calculate the molarity of an HCl solution if 23.88 mL of it reacts with 6.5287 grams of sodium carbonate (106 g/mol) according t
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Answer:

5.158 mol/L

Explanation:

To find the molarity, you need to use the formula:

Molarity (M) = moles / volume (L)

You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.

<u>Steps 1 - 2:</u>

2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂

6.5287 g Na₂CO₃         1 mole            2 moles HCl
--------------------------  x  -------------  x  -------------------------  =  0.12318 mole HCl
                                      106 g           1 mole Na₂CO₃

<u>Step 3:</u>

23.88 mL / 1,000 = 0.02388 L

<u>Step 4:</u>

Molarity = moles / volume

Molarity = 0.12318 mole / 0.02388 L

Molarity = 5.158 mole/L

**mole/L is equal to M**

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