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3 years ago

Where is the air pressure greater-- at sea level or on a mountaintop? Explain

Chemistry

1 answer:

Nady [450]3 years ago

8 0

Answer:

Air pressure is greater at sea level than at the top of a mountain. The amount of air at sea level is greater than that on top of a mountain.

Explanation:

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The fraction of a radioactive isotope remaining at time t is (1/2)^t/t1/2 where t1/2 is the half-life. If the half-life of carbo

Katena32 [7]

Answer:

a) $1.065\times 10^{-8}$ fraction of carbon−14 in a piece of charcoal remains after 14.0 years.

b) $0.000\times 10^{-3}$ fraction of carbon−14 in a piece of charcoal remains after $1.900\times 10^4 years$

c) $0.0000\times 10^{-4}$ fraction of carbon−14 in a piece of charcoal remains after $1.0000\times 10^5 years$ .

Explanation:

The fraction of a radioactive isotope remaining at time t is given by:

$[A]=\frac{(\frac{1}{2})^t}{t_{\frac{1}{2}}}$

Taking log both sides:

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

[A] = fraction at given time t

$t_{\frac{1}{2}}$ = half life of the carbon−14 =5,730 years

a)When , t = 14 years

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 14 years\times (-3010)-\log [5,730 years]$

$[A]=1.065\times 10^{-8}$

b)When , t = $1.900\times 10^4 years$

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 1.900\times 10^4 years\times (-3010)-\log [5,730 years]$

$[A]=0.000\times 10^{-3} [/tex$

c)When , t = $1.0000\times 10^5 years$

$\log [A]=t\log[\frac{1}{2}]-\log [t_{\frac{1}{2}}]$

$\log [A]= 1.0000\times 10^5 years\times (-3010)-\log [5,730 years]$

$[A]=0.0000\times 10^{-4}$

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3 years ago

What kind of waves do light waves travel in and how do they move

IgorLugansk [536]

Light is one form of energy that travels in electromagnetic waves. This energy is both magnetic and electrical. There are many different types of electromagnetic (EM) waves.

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2 years ago

According to Table I, which equation represents a change resulting in the greatest quantity of energy released?

love history [14]

The answer is 3. The releasing of energy means exothermic reaction. So the ΔH should be negative. And the greatest quantity of energy released means that the greatest number. So according to the table I, the answer is 3.

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4 years ago

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When the volume of the gas is 8L what is the pressure being exerted upon it?

Harlamova29_29 [7]

Answer:

Explanation:

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3 years ago

"how many grams of sucrose (c12h22o11) are in 1.55 l of 0.758 m sucrose solution"

Ierofanga [76]

<span>You would use the equation: Molarity M equals amount of solution over volume of solution. So, 0.758 M equals x L divided by 1.55 L OR 0.758 M = x L / 1.55 L . To solve: 1.55 multiplied by 0.758 equals 1.1479. The answer is 1.1479.</span>

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3 years ago