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3 years ago

10.Give an example of an adaptation in birds, where shape of beak is related to the eating habits of that bird.

Chemistry

1 answer:

iVinArrow [24]3 years ago

4 0

Answer:

It isn't only for the eating habits but also for building nests, hunting small insects, birds, other creatures including defence. Birds have a narrow small throat so the beak helps ripping off small peices of a big animal l(small bird) and for insects they crush and swallow it, they se their beak for feeding their children by grinding food in their beak and transferring it to the youngsters mouth

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What occurs when energy is removed from a liquid-vapor system in equilibrium

yulyashka [42]

The answer is that the number of water molecules increases and that of vapor decreases. When energy is removed from the system it would do so mostly as heat. Therefore the energy in the system would decrease and the molecules would vibrate at lower energies. Therefore, several water vapor molecules would turn back to water.

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3 years ago

14. As the moles of salt added are increased, what happens to the melting point of the water?

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3 years ago

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4 years ago

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Calculate the pH after 10 mL of 1.0 M sodium hydroxide is added to 60 mL of 0.5M acetic acid.

baherus [9]

Explanation:

It is given that the total volume is (10 mL + 60 mL) = 70 mL.

Also, it is known that $M_{1}V_{1}$ = $M_{2}V_{2}$

Where, $V_{1}$ = total volume

$V_{2}$ = initial volume

Therefore, new concentration of $CH_{3}COOH$ = $\frac{M_{2}V_{2}}{V_{1}}$

= $\frac{60 \times 0.5}{70}$

= 0.43 M

New concentration of NaOH = $\frac{M_{2}V_{2}}{V_{1}}$

= $\frac{10 \times 1.0}{70}$

= 0.14 M

So, the given reaction will be as follows.

$CH_{3}COOH + OH^{-} \rightarrow CH_{3}COO^{-} + H_{2}O$

Initial: 0.43 0.14 0

Change: -0.14 -0.14 0.14

Equilibrium: 0.29 0 0.14

As it is known that value of $pK_{a}$ = 4.74

Therefore, according to Henderson-Hasselbalch equation calculate the pH as follows.

pH = $pK_{a} + log \frac{[CH_{3}COO^{-}]}{[CH_{3}COOH]}$

= $4.74 + log \frac{0.14}{0.29}$

= 4.74 + (-0.316)

= 4.42

Therefore, we can conclude that the pH of given reaction is 4.42.

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3 years ago

Which polyatomic ion has a charge of 3-?

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3 years ago