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vredina [299]
3 years ago
11

Can someone help me with this chem homework??!! Please

Chemistry
1 answer:
mrs_skeptik [129]3 years ago
6 0

Answer:

do it your self

Explanation:

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PLEASE ANSWER I NEED THE ANSWER ASAP!!!!!!!!!The table shows the amount of radioactive element remaining in a sample over a peri
qaws [65]

Answer:

pt1

The half-life of the element is 1,600 years.

pt2

k = ln(2)/(t1/2) = 0.693/(t1/2).

Where, k is the rate constant of the reaction.

t1/2 is the half-life of the reaction.

∴ k =0.693/(t1/2) = 0.693/(1,600 years) = 4.33 x 10⁻⁴ year⁻¹.

kt = ln([A₀]/[A]),

where, k is the rate constant of the reaction (k = 4.33 x 10⁻⁴ year⁻¹).

t is the time of the reaction (t = ??? year).

[A₀] is the initial concentration of the sample ([A₀] = 312.0 g).

[A] is the remaining concentration of the sample ([A] = 9.75 g).

∴ t = (1/k) ln([A₀]/[A]) = (1/4.33 x 10⁻⁴ year⁻¹) ln(312.0 g/9.75 g) = [8,000 year].

-Hops

3 0
4 years ago
Help me, please
Finger [1]
Put the marked magnet up to each side of the unmarked one. if they attract they are opposite -north attracts south, south attracts north- if they repel -forcefully push away- from each other they are the same -north and north, or south and south. once you have done that you can label the poles correctly.
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3 years ago
The speed of light through clear rock salt is 1.98 × 108 m/s. Calculate its index of refraction. The speed of light in air (vacu
pantera1 [17]

Answer:

1.52

Explanation:

speed of light through clear rock salt = speed of light in air (vacuum)/index of refraction

index of refraction of clear rock salt = speed of light in air (vacuum) / speed of light through clear rock salt

index of refraction of clear rock salt= 3.00 x 10^8 m/s / 1.98 × 10^8 m/s

index of refraction of clear rock salt= 3.00 x 10^8/1.98 × 10^8 ( the × 10^8 cancels out)

index of refraction of clear rock salt= 3.00/1.98

index of refraction of clear rock salt= 1.52

3 0
2 years ago
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