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mihalych1998 [28]
3 years ago
13

jai was measuring the radioactivity of different radioactive isotopes. isotope a had a starting radioactive level of 50 g, and a

fter 4 days it measured at 30 g. isotope b had a starting radioactive level of 75 g, and after 4 days it measured at 25 g. which best explains the isotopes?
Chemistry
2 answers:
riadik2000 [5.3K]3 years ago
6 0
Try b im pretty sure its right 
poizon [28]3 years ago
6 0

it sure i B i got i checked

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He equilibrium constant (KP) is 0.21 at a particular temperature for the reaction:
lorasvet [3.4K]

Explanation:

We will use the following equation,  

     Q_{p} = \frac{(P^{2}_{NO_{2}}{P_{N_{2}O_{4}}

(a) Now, we will calculate the value of Q_{p} as follows.

          Q_{p} = \frac{(0.225)^{2}}{0.134}

                      = 0.377

As, the K_{p} is 0.21 (which is smaller than the value) this means that equilibrium will shift to the left .

(b)   Q_{p} = \frac{(0.086)^{2}}{0.064}

                  = 0.1155

Here, Q_{p} is smaller than k_{p} which means that the equilibrium will shift to the right.

(c)   Q_{p} = \frac{(0.13)^{2}}{0.142}

                   = 0.119

Here, Q_{p} is smaller than k_{p} which means that the equilibrium will shift to the right .

(d)    Q_{p} = \frac{(0.173)^{2}}{0.142}

                  = 0.21  

Since, here the value of Q_{p} comes out to be equal to the given value. Therefore, this reaction is at equilibrium.

(e)  Q_{p} = \frac{(0.151)^{2}}{0.062}

                  = 0.36

Here, Q_{p} is higher than k_{p} the reaction will shift to the left.

6 0
3 years ago
Who was one of the first people to suggest that matter is made up of particles that cannot be divided? A. Democritus B. Thomson
Dominik [7]

(A). Democritus is the answer

5 0
3 years ago
I know the correct answer is either a or d. Can anyone explain which one it is and why? CH3C ≡ CCH2CH2Cl is named: a. 1-chloro-3
lara31 [8.8K]

Answer:

D.

Explanation:

CH₃C≡ CCH₂CH₂Cl

Since there are 5 carbons so the suffix used is "pent"

There is a triple bond so its alkyne

So the compound becomes 2-pentyne (2 because the triple bond is with the 2nd carbon)

Then,

The functional group of chlorine is attached with 5th carbon So the compound becomes

5-chloro,2-pentyne

8 0
3 years ago
A balloon has a pressure of 3.1 atm at a volume of 155 ml. if the temperature is held constant, what is the volume (ml) if the p
GarryVolchara [31]

Answer:

45.8 mL

Explanation:

If all variables are held constant, the new volume can be found using the Boyle's Law equation. The equation looks like this:

P₁V₁ = P₂V₂

In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the new volume by plugging the given values into the equation and simplifying.

P₁ = 3.1 atm                        P₂ = 10.5 atm

V₁ = 155 mL                       V₂ = ? mL

P₁V₁ = P₂V₂                                                 <----- Boyle's Law equation

(3.1 atm)(155 mL) = (10.5 atm)V₂                <----- Insert values

480.5 = (10.5 atm)V₂                                  <----- Multiply 3.1 and 155

45.8 = V₂                                                    <----- Divide both sides by 10.5

4 0
2 years ago
Materials that have high resistance to electric current are called ____________.
yaroslaw [1]
Electrical insulators.
3 0
3 years ago
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