3 years ago

Help with my science for brainiest:)

Chemistry

1 answer:

zimovet [89]3 years ago

3 0

Answer:

Hereeeee

Explanation:

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Which is the outmost layer of the atmosphere

ikadub [295]

Answer: Exosphere

Explanation: Exosphere. This is the outermost layer of the atmosphere. It extends from the top of the thermosphere to 6,200 miles (10,000 km ) above the earth.

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3. 79,789kJ = (293k) (377kJ)

KatRina [158]

the anwser would most likely be j=0

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Geologists use the decay of potassium-40 in volcanic rocks to determine their age. Potassium-40 has a half-life of 1.26 109 year

melomori [17]

Answer:

$m_{o} \approx 3.247\times 10^{-7}\,g$

Explanation:

The mass of radioactive isotope at a certain time is given by the following expression:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$

Time constant can be calculed in terms of half-life:

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

$\tau = \frac{1.26\times 10^{9}\,yr}{\ln 2}$

$\tau = 1.818\times 10^{9}\,yr$

The initial mass is:

$m_{o} = \frac{2.73\times 10^{-7}\,g}{e^{-\frac{3.15\times 10^{8}\,yr}{1.818\times 10^{9}\,yr} }}$

$m_{o} \approx 3.247\times 10^{-7}\,g$

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3 years ago

Name the following alkane molecule:

Zina [86]

Answer:

Explanation:

its upside down but I'm 99% sure

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3 years ago

Please help!!! Whoever answers first or has a good answer will be marked Brainiest Answer

Goshia [24]

Explanation:

Its ok you got this. Grab a calculator, divide the first number by the second number for each problem. And then bam, density.

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