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Chemistry

1 answer:

Monica [59]3 years ago

6 0

In the first image the fourth box(change) in distance) goes with the first box in the second image (what is speed). The acceleration definition is a change in velocity
You can calculate speed by dividing distance and time
And you can solve acceleration by dividing time by distance

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7. Phosphorus 32 ( 32), a radioactive isotope of phosphorus, has a half-life of 14.2 days. a. If the amount of radioactivity of

Wittaler [7]

Explanation:

(a) Given that:

Half life = 14.2 days

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{14.2}\ days^{-1}$

<u>The rate constant, k = 0.0488 days⁻¹ </u>

(b)Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration = 100 g

So,

$[A_t]=100\times e^{-0.0488\times t}\ g$

So,

$[A_t]=100\times e^{-0.0488\times 6}\ g$

<u>Amount left = 74.6171 g</u>

4 0

4 years ago

Use the changes in oxidation numbers to identify which atoms are oxidized and which are reduced in each reaction.

krok68 [10]

You didn't include much information as to what you were referring too, however I answered a similar question recently to a friend so I'm hoping this is the same question in complete as to yours, if not I apologize.

a.) 2Na(s) + Cl2(g) -----> 2NaCl(s)
Na --> Na+1 is oxidized
Cl2 --> Cl- is reduced

b.) 2HNO3(aq) + 6HI(aq) ----> 2NO(g) + 3I2(s) + 4H2O(l)
N+5 --> N+2 is reduced
I-1 --> I2 is oxidized

5 0

3 years ago

Nitrogen oxide is a gas that is injected into potatoes chip bags right before they are sealed. How

Ugo [173]

Explanation:

$pressure = 760mm \: of \: mercury \\ = 101325 \: pascals \\ from \: PV = nRT \\ 101325 \times 1 = n \times 8.314 \times 273 \\ n = 44.6 \: moles$