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3 years ago

Tick the correct statement and cross the incorrect one.

Chemistry

1 answer:

geniusboy [140]3 years ago

6 0

Answer:

First ine is true and the second one is False because rhinoceros is found mostly in Chitwan national park in terai region .

1 . plants and animals

2 . plants and animals (primary consumers on plants and secondary consumers on both )

3 . sustainable and balanced environment ( exceptional if it has been written in your science book )

4 . ?? flora or fauna is your question been asked ?

5 . climate variation

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aleksklad [387]

Tough question, I would suggest using Google maybe, or just plain out asking your science teacher.

8 0

3 years ago

True or false???????????

Leni [432]

Answer:

false

Explanation:

longer the wave length less frequency

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3 years ago

What is the % dissociation of a solution of acetic acid if at equilibrium the solution has a pH = 4.74 and a pKa = 4.74?

Ymorist [56]

Answer:

$\% diss = 50\%$

Explanation:

Hello there!

In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:

$HA\rightleftharpoons H^++A^-\\\\Ka=\frac{[H^+][A^-]}{[HA]}$

Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:

$Ka=\frac{x^2}{[HA]_0-x} =10^{-4.74}=1.82x10^{-5}$

Thus, it is possible to find x given the pH as shown below:

$x=10^{-pH}=10^{-4.74}=1.82x10^{-5}M$

So that we can calculate the initial concentration of the acid:

$\frac{(1.82x10^{-5})^2}{[HA]_0-1.82x10^{-5}} =1.82x10^{-5}\\\\\frac{1.82x10^{-5}}{[HA]_0-1.82x10^{-5}} =1\\\\$

$[HA]_0=3.64x10^{-5}M$

Therefore, the percent dissociation turns out to be:

$\% diss=\frac{x}{[HA]_0}*100\% \\\\\% diss=\frac{1.82x10^{-5}M}{3.64x10^{-5}M}*100\% \\\\\% diss = 50\%$

Best regards!

6 0

3 years ago

Wich of the following is a unit of volume in the english system of mesurement

ch4aika [34]

Answer:

uhh its gallon

Explanation:

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4 years ago

What is a major difference between a chemical reaction and a nuclear reaction? A) Only chemical reactions release light. B) Only

zhuklara [117]

I think it is C. its the only one that makes sense

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3 years ago

Read 2 more answers