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3 years ago

What is the energy of a 4.66 x 1014 Hz wave?

Chemistry

1 answer:

docker41 [41]3 years ago

4 0

I attached the working and the answer to both questions below.

Please note that E = energy, ν = frequency, h = Plank's Constant

The energy of a 4.66 x 10¹⁴ Hz wave is 3.088 × 10⁻¹⁷ J

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What type of bond is formed between hydrogen and nitrogen in ammonia (NH3)? A. polar covalent B. ionic C. nonpolar covalent D. m

cricket20 [7]

The answer is A polar covalent

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4 years ago

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The acid dissociation constant Ka of boric acid (H3BO3) is 5.8 times 10^-10. Calculate the pH of a 4.4 M solution of boric acid.

madam [21]

Answer: The pH of a 4.4 M solution of boric acid is 4.3

Explanation:

$H_3BO_3\rightarrow H^+H_2BO_3^-$

at t=0 cM 0 0

at eqm $c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 4.4 M and $\alpha$ = ?

$K_a=5.8\times 10^{-10}$

Putting in the values we get:

$5.8\times 10^{-10}=\frac{(4.4\times \alpha)^2}{(4.4-4.4\times \alpha)}$

$(\alpha)=0.000011$

$[H^+]=c\times \alpha$

$[H^+]=4.4\times 0.000011=4.8\times 10^{-5}M$

Also $pH=-log[H^+]$

$pH=-log[4.8\times 10^{-5}]=4.3$

Thus pH of a 4.4 M $H_3BO_3$ solution is 4.3

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4 years ago

All of the following are solutions except?

Vaselesa [24]

Answer:

fruit cake is the right ans

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3 years ago

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A/an bonds allows metals to conduct electricity

dalvyx [7]

If I understand you correctly, you should fill the gap and decide which kind og bonds allows metals to conduct electricity. If so, without any doubt I can say that the metalic bonds allows metals to conduct electricity. I'm pretty sure it will help you! Regards.

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3 years ago

Arbon dioxide is dissolved in blood (ph 7.5) to form a mixture of carbonic acid and bicarbonate. Part a neglecting free co2, wha

Aleks04 [339]

Answer : The fraction of carbonic acid present in the blood is 5.95%

Explanation :

The mixture consists of carbonic acid ( H₂CO₃) and bicarbonate ion ( HCO₃⁻). This represents a mixture of weak acid and its conjugate which is a buffer.

The pH of a buffer is calculated using Henderson equation which is given below.

$pH = pKa + log \frac{[Base]}{[Acid]}$