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Shtirlitz [24]
4 years ago
7

When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although

Chemistry
1 answer:
Oduvanchick [21]4 years ago
4 0
Its. a c but im not sure. ??.?
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What is ozone ? A) dissolved oxygen B) the main catalyst in photosynthesis C) a type of oxygen D) a form of calcium carbonate
kykrilka [37]

Answer:

C)

Explanation:

ozone is a type of oxygen. It's chemical compound is 03. Just 1 more molecule than regualr oxygen.

Glad I was able to help!!

7 0
3 years ago
Read 2 more answers
Calculate the percent ionization of nitrous acid in a solution that is 0.230 M in nitrous acid. The acid dissociation constant o
djyliett [7]
Ok first, we have to create a balanced equation for the dissolution of nitrous acid.

HNO2 <-> H(+) + NO2(-)

Next, create an ICE table

           HNO2   <-->  H+        NO2-
[]i        0.230M          0M       0M
Δ[]      -x                   +x         +x
[]f        0.230-x          x           x

Then, using the concentration equation, you get

4.5x10^-4 = [H+][NO2-]/[HNO2]

4.5x10^-4 = x*x / .230 - x

However, because the Ka value for nitrous acid is lower than 10^-3, we can assume the amount it dissociates is negligable, 

assume 0.230-x ≈ 0.230

4.5x10^-4 = x^2/0.230

Then, we solve for x by first multiplying both sides by 0.230 and then taking the square root of both sides.

We get the final concentrations of [H+] and [NO2-] to be x, which equals 0.01M.

Then to find percent dissociation, you do final concentration/initial concentration.

0.01M/0.230M = .0434 or 

≈4.34% dissociation.
8 0
3 years ago
9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?<br>with steps pls​
ryzh [129]

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

5 0
3 years ago
Which description best characterizes the motion of particles in a solid?
antoniya [11.8K]

The particles in a solid are tightly packed and locked in place. Although we cannot see it or feel it, the particles are vibrating in place.

As these molecules heat up, they will vibrate more vigorously, and will eventually turn to water, then gas.

5 0
3 years ago
Read 2 more answers
Geothermal energy is possible where there is <br><br>a.wind<br>b.oil<br>c.coal<br>d.magma
Leviafan [203]

D magma hope this helps

8 0
4 years ago
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