2 years ago

Complete the given equation and mention whether heat is absorbed or evolved during the chemical reaction.

Chemistry

1 answer:

DaniilM [7]2 years ago

5 0

Answer:

NaCI + H2O

this is answer

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The frequency of an x-ray wave is 3.0 x 1012MHz. Its wave speed is 3.0x 108m/s. Calculate the wavelength of the x-ray wave below

jasenka [17]

Answer: The wavelength of the x-ray wave is $10^{-10}m$

Explanation:

To calculate the wavelength of light, we use the equation:

$\lambda=\frac{c}{\nu}$

where,

$\lambda$ = wavelength of the light = ?

c = speed of x-ray= $3.0\times 10^8m/s$

$\nu$ = frequency of x-ray = $3.0\times 10^{12}MHz=3.0\times 10^{18}Hz= 3.0\times 10^{18}s^{-1}$ $(1Hz=1s^{-1})$

Putting in the values:

$\lambda=\frac{3.0\times 10^8m/s}{3.0\times 10^{18}s^{-1}}=10^{-10}m$

Thus the wavelength of the x-ray wave is $10^{-10}m$

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3 years ago

How many molecular does 36.0 grams of water represent?

rewona [7]

Answer: <span>1.20 x 10^24 molecules

Hope this helps!</span>

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3 years ago

iodide-131 decays with half life of 8.02 d. In a Sample initially containing 5.00 mg of I 131, what mass remains after 6.01 d?

Genrish500 [490]

You can use the equation f(t) = 5*(1/2)^(t/8.02)

Then plug in 6.01 for time.There remains 2.97 mg in the sample.

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3 years ago

Iobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample?

melamori03 [73]

$A=A_{0}*( \frac{1}{2})^{ \frac{t}{h}} 
\\ \\A - final\ amount 
\\ \\A_{0} - initial\ amount
\\ \\ t - time
\\ \\ h - half\ life
\\ \\ A=300.0 g*( \frac{1}{2})^{ \frac{2040}{680}} 
\\ A = 37.50 g
$

7 0

3 years ago

Read 2 more answers

What does it mean if an element has no subscript in a chemical formula?

bulgar [2K]

Answer:

The letter or letters that represent an element are called its atomic symbol. The numbers appearing as subscripts in the chemical formula indicate the number of atoms of the element immediately before the subscript. If no subscript appears, one atom of that element is present

Explanation:

Have a GR8 day (:

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3 years ago