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3 years ago

What processes contribute water to surface water sources?(science)

1 answer:

5 0

Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. Although the total amount of water within the cycle remains essentially constant, its distribution among the various processes is continually changing.

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Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a

agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = $5.000\mu g$

a - x = amount left after decay process = $\frac{10}{100}\times 5.000\mu g=0.5\mu g$

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}$

b) for reducing the mass to 10.00 % of its original mass

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

$t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}$

$t=243hours$

The time taken to reach 10.00 % of its original mass is 243 hours

3 0

3 years ago

HELP PLZ :(((((((

Usimov [2.4K]

Metamorphic rocks are not easy to make, they are made from rock being exposed to enormous amounts of heat and pressure. Examples of these rock<span> types include marble, slate, gneiss and schist. </span>

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3 years ago

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What is a climograph

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A climograph is a dual-purpose graph, showing two different kinds of information. A bar graph shows how much precipitation a given place receives during a period of time. A line graph shows the temperature conditions for the same place during the same period of time.

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3 years ago

When elements form bonds, it changes their ______ properties.<br>The answer is..?

Arturiano [62]

Answer:

chemical and physical

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3 years ago

What is the molarity of a NaCl solution with 3.7 moles and 2.3 L?*

a_sh-v [17]

Answer:

5.0 molatrity

Explanation:

because i just known

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3 years ago

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