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ivolga24 [154]
3 years ago
9

All of the following chemical chanes except

Chemistry
1 answer:
ser-zykov [4K]3 years ago
4 0
Water being boiled, because for a chemical change to occur there needs to be at least one new substance formed.
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3) A certain reaction has the following general form: A + B à AB At a particular temperature the concentration versus time were
seropon [69]

Answer:

a. First order.

b. k=3.7x10^{-3}s ^{-1}

c. t_{1/2}=187.3s

d. [A]=0.111M

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

ln[A]=-kt+ln[A]_0

Which is also:

y=mx+b

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}

c. For first-order reactions, the half-life is:

t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s

d. In this case, since the integrated first-order rate law is:

[A]=[A]_0exp(-kt)

The concentration once 220 seconds have passed is:

[A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\

[A]=0.111M

Regards.

7 0
3 years ago
4 Na + O2 → 2 Na2O<br><br> 6.79 moles of O2 will react to form how many moles of Na2O?
Nataly_w [17]

Answer:

13.94moles of Na₂O

Explanation:

The balanced reaction expression is given as:

        4Na  +  O₂  →   2Na₂O

Given parameters:

Number of moles of O₂ = 6.97moles

Unknown:

Number of moles of Na₂O

Solution:

 To solve this problem;

            1 mole of O₂  will produce 2 moles of Na₂O ;

            6.97 moles of O₂ will produce 6.97 x 2  = 13.94moles of Na₂O

6 0
3 years ago
Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at l
Vesnalui [34]
Isn't that Hund's rule????

5 0
3 years ago
What are three ways that we can identify when a chemical reaction is occurring?
Nina [5.8K]
Three ways (out of the many) are:

Change of temperature
Color change
Formation of gas

Hope this helps!! (:
6 0
3 years ago
GUYS, PLEASE HELP ME I'M ON THE LAST QUESTION AND I GET IT WRONG I HAVE TO START OVER. no links
KiRa [710]

Answer:

its actually experimental this time

Explanation:

sorry bout the last one i just wanna help:(

6 0
3 years ago
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