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3 years ago

Choose the correct statement

Chemistry

1 answer:

konstantin123 [22]3 years ago

6 0

Answer:

maybe number b is correct. ...thank you

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group or column The sum of the masses of all the protons and neutrons in an atom. Represents the tendency of the atom to either

NeX [460]

c. protons and neutrons

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4 years ago

The surface area of an object to be gold plated is 49.8 cm2 and the density of gold is 19.3 g/cm-3. A current of 3.15. A is appl

garik1379 [7]

Answer: Time required to deposit an even layer of gold with given thickness is $5.3 \times 10^{2}$ sec.

Explanation:

The given data is as follows.

Surface area = 49.8 $cm^{2}$ ,

Density of gold = 19.3 $g/cm^{3}$ ,

Current = 3.15 A, thickness of gold layer = $1.2 \times 10^{-3} cm$

It is known that relation between volume, area and thickness is as follows.

V = Surface area × Thickness

= $49.8 \times 1.2 \times 10^{-3} cm$

= 0.05988 $cm^{3}$

Therefore, we will calculate the time required to deposit an even layer of gold with given thickness is calculated as follows.

$0.05988 \times cm^{3} \times \frac{19.3 g Au}{1 cm^{3}} \times \frac{1 mol Au}{197 g Au} \times \frac{3 mol e^{-}}{1 mol Au} \times \frac{96485}{1 mol e^{-}} \times \frac{1 As}{1 C} \times \frac{1}{3.20 A}$

= $5.3 \times 10^{2}$ sec

Thus, we can conclude that time required to deposit an even layer of gold with given thickness is $5.3 \times 10^{2}$ sec.

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3 years ago

A small hummingbird flying around beats its wings with a frequency of 170 Hz. If the wavelength of the sound wave produced is 2

bearhunter [10]

The given information in the question is :

Frequency = 170 Hz

1 Hz = $\frac{1}{s}$

Frequency = 170 $\frac{1}{s}$

Wavelength given = 2 m

Speed is unknown which we need to calculate.

Speed can be calculated by using the formula : Speed = wavelength X frequency

By plugging the value of wavelength and frequency in the above formula we get :

Speed = $(2m)\times (170\frac{1}{s})$

Speed = 340 $\frac{m}{s}$

3 0

3 years ago

How many atoms are in 5.5 moles of carbon dioxide

Veronika [31]

Answer: I think the answer is, 3.312177825e+24 atoms

Explanation: I had a problem similar to this, Hope this helps!

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3 years ago

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Is this a correct electron config?

lina2011 [118]

Yes, hope this helped!

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3 years ago