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4 years ago

Is filling up beakers with 200ml of water bad

Chemistry

1 answer:

iogann1982 [59]4 years ago

6 0

Answer:

Explanation:

Filling a beaker 200ml of water is not bad because Each beaker's capacity may vary according to the size of different beaker.

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Bacteria that can make food using chemicals are called

Naddik [55]

False because I think it’s supposed to be photoheteroterotrophs

4 0

3 years ago

A 0.020 M solution of niacin has a pH of 3.26. (a) What percentage of the acid is ionized in this solution

mariarad [96]

Answer: 2.75%

Explanation:

$pH=-log [H+]$

$3.26 = -log [H+]$

$[H+] = 5.495\times 10^{-4} M$

$HA\rightleftharpoons H^++A^-$

initial 0.020 0 0

eqm 0.020 -x x x

$K_a=\frac{[H+][A-]}{[HA]}$

$K_a=\frac{[x][x]}{[0.020-x]}$

$x=5.495\times 10^{-4}$

$K_a=\frac{[5.495\times 10^{-4}]^2}{[0.020-5.495\times 10^{-4}]}$

$K_a =1.553\times 10^{-5}$

percent dissociation = $\frac{[H^+_eqm]}{[Acid_{initial}]}\times 100$

percent dissociation= $\frac{5.495\times 10^{-4}}{0.020}\times 100$

Thus percent dissociation= 2.75 %

5 0

3 years ago

1b<br>Describe the terms below:<br>2. adiabatic process

Ugo [173]

Answer:

defined as a process in which mo heat transfer take place

Explanation:

is a process which occurs without transferring heat /mass between the system and it's surrounding.

8 0

3 years ago

!!!10 POINTS!!! Which of these is an example of an engineering solution?

lutik1710 [3]

Answer:

Explanation:

Because it will not cause much harm to the environment.

I hope it's right (best of luck).

8 0

3 years ago

The pH of a solution is 9.63 ± 0.03 . What is the concentration of H + in the solution and its absolute uncertainty?

Helga [31]

Explanation:

The pH of the solution is 9.63 ± 0.03.

we know that

pH= -log[H+]

⇒[H+] = $10^{-pH}$

= $10^{-9.63}$ = $2.34\times10^{-10}$

Now to find absolute error we use the formula

Absolute error/[H+] =ln10(uncertainity)

Absolute error = ln10×[H+] ×0.03

$=ln10\times2.34\times10^{-10}\times0.03$

= $9.45\times10^{-12}$

8 0

3 years ago