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tresset_1 [31]
2 years ago
4

A system proposed by the U.S. Navy for underwater submarine communication, called ELF (for extremely low frequency, operates wit

h a frequency of 76 Hz. What is the wavelength of this radiation in meters? In miles? (I mile=1.61 km) What is the energy in joules of the frequency?
Chemistry
1 answer:
Akimi4 [234]2 years ago
4 0

Explanation:

Frequency = 76 Hz

Wavelength =?

The parameters are related by;

FREQUENCY OF OSCILLATION x WAVELENGTH = SPEED OF LIGHT

Wavelength = Speed of light / Frequency

Wavelength = 299,792,458 / 76

Wavelength = 3944637.61m

Wavelength = 3944.63761 km

Wavelength = 2450.09 miles (Upon conversion to miles by division by 1.61)

Energy = ?

E = h · f

where h = planks constant

Energy = 6.626 * 10^-34 * 76

Energy = 503.576 * 10^-34

Energy = 5.03576 * 10^-32 J

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If 3.491 grams of the precipitate was formed, how many moles of strontium bromide were reacted
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The balanced chemical equation that represents the reaction is as follows:
 <span>SrBr2(aq) + 2AgNO3(aq) → Sr(NO3)2(aq) + 2AgBr(s) 
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molar mass of silver bromide = 108 + 80 = 188 grams

number of moles = mass / molar mass
number of moles of produced precipitate = 3.491/188 = 0.018 moles

From the balanced equation:
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2 years ago
How many grams are in 2.5 pound sample
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5 0
2 years ago
Be sure to answer all parts. There are three different dichloroethylenes (molecular formula C2H2Cl2), which we can designate X,
sertanlavr [38]

Answer:

Explanation:Since the compound X has no net-dipole moment so we can ascertain that this compound is not associated with any polarity.

hence the compound must be overall non-polar. The net dipole moment of compound is zero means that the vector sum of individual dipoles are zero and hence the two individual bond dipoles associated with C-Cl bond  must be oriented in  the opposite directions with respect to each other.]

So we can propose that compound X must be trans alkene as only in trans compounds the individual bond dipoles cancel each other.

If one isomer of the alkene is trans then the other two isomers may be cis .

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The two possibility of cis structures are possible:

in the first way it is possible the one carbon has two chlorine substituents and the carbon has two hydrogens.

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7 0
2 years ago
93.2 mL of a 2.03 M potassium fluoride (KF) solution
Marrrta [24]

Answer:

1.98 M

Explanation:

Given data

  • Initial volume (V₁): 93.2 mL
  • Initial concentration (C₁): 2.03 M
  • Volume of water added: 3.92 L

Step 1: Convert V₁ to liters

We will use the relationship 1 L = 1000 mL.

93.2mL \times \frac{1L}{1000mL} = 0.0932 L

Step 2: Calculate the final volume (V₂)

The final volume is the sum of the initial volume and the volume of water.

V_2 = 0.0932L + 3.92 L = 4.01L

Step 3: Calculate the final concentration (C₂)

We will use the dilution rule.

C_1 \times V_1 = C_2 \times V_2\\C_2 = \frac{C_1 \times V_1}{V_2} = \frac{2.03 M \times 3.92L}{4.01L} = 1.98 M

3 0
2 years ago
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