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seraphim [82]
3 years ago
8

I WILL GIVE YOU 20 PTS which of the following is true? A.water is an impact to an organisms. B.Some substances must be dissolved

in water before they can be used. C.all organisms obtain water though only their food.D. plant cells are unaffected when water is scare.
Chemistry
2 answers:
Effectus [21]3 years ago
5 0
<span>B.Some substances must be dissolved in water before they can be used!
Have a nice day!
:D</span>
timurjin [86]3 years ago
5 0
I'm not entirely sure. But I know the answer isn't D or C. My best guess is <span>B.Some substances must be dissolved in water before they can be used. </span>
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Determine the ph of a 0.500 m hno2 solution. Ka of hno2 is 4.6 × 10−4.
Mumz [18]

Answer: pH of a 0.500 M HNO_2 solution is 1.82

Explanation:

HNO_2\rightarrow H^++NO_2^-

 cM              0             0

c-c\alpha        c\alpha     c\alpha     

So dissociation constant will be:

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

Give c= 0.500 M and \alpha = ?

K_a=4.6\times 10^{-4}

Putting in the values we get:

4.6\times 10^{-4}=\frac{(0.500\times \alpha)^2}{(0.500-0.500\times \alpha)}

(\alpha)=0.030

[H^+]=c\times \alpha

[H^+]=0.500\times 0.030=0.015

Also pH=-log[H^+]

pH=-log[0.015]=1.82

Thus pH of a 0.500 M HNO_2 solution is 1.82

3 0
3 years ago
The following equation represents the type of reaction called
Mazyrski [523]

Answer:

Reduction

Explanation:

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Mn⁺⁷ +3e⁻    →    Mn⁴⁺

Mn gets three electrons , its oxidation state reduced from +7 to +4 so Mn gets reduced.

Examples:

Consider the following reactions.

4KI + 2CuCl₂  →   2CuI  + I₂  + 4KCl

the oxidation state of copper is changed from +2 to +1 so copper get reduced.

CO + H₂O   →  CO₂ + H₂

the oxidation state of carbon is +2 on reactant  side and on product side it becomes  +4 so carbon get oxidized.

H₂S + 2NaOH → Na₂S + 2H₂O

The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.

6 0
3 years ago
What is the volume in milliliters of 7.66 g of acetone
frosja888 [35]
In order to solve this, we have to know the density of acetone because it is the ratio of mass to volume. At a certain temperature and pressure, the density of a specific substance does not change. It is an intrinsic property of a substance with temperature and pressure dependence.  Assuming this is in normal conditions, the density is equal to 0.784 g/mL. So, the volume would be equal to

Volume = Mass/Density
Volume = 7.66 g/0.784 g/mL = 9.77 mL
3 0
3 years ago
In this project, you will research the harm that can be done to your health by environmental factors. Using the resources of you
umka21 [38]
Wooahhhh pollution can affect the environment and urself pollited water can affect marine animals and can result them in extinction global warmning melts Antarctica and can cause floodigs and extinction there. This probably wont help but i just free styled lol
Goodluck
3 0
3 years ago
Does The nucleus of an atom contain all of the protons in the atom
Rina8888 [55]

i think so.

i learned this recently and my textbook says that neutrons and protons are in the nucleus and electrons orbit around the nucleus. :)

i hope i was able to help

6 0
3 years ago
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