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3 years ago

A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?

Chemistry

2 answers:

Natalija [7]3 years ago

8 0

I believe it becomes less dense, bc when you heat something it’s molecules spread further apart.

Irina-Kira [14]3 years ago

7 0

Yes it becomes less dense because when the water molecules are hot it tends to go around more faster but if it was cold it would stay still. Just like us humans would do.

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What is the largest contributor to the greenhouse effect?

Sloan [31]

Answer:

burning of fossil fuels

Explanation:

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3 years ago

What is the energy of a photon of green light with a frequency of 5.80 x 10^14/s

dedylja [7]

I'm not understanding that much. but if i'm right the answer is <span>3.84 x 10^-19 J</span>

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3 years ago

Perform an on-line search to discover what conditions are favourable to the growth of moss. be sure to include a comment on ph c

Genrish500 [490]

Moss can grow abundantly in an environment with favorable conditions. They usually grow abundantly in cool, moist and dark places. If not dark, they prefer shady areas. Also, they tend to grow in acidic soil with pH range between 5.0-5.5.

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3 years ago

A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5

Citrus2011 [14]

Answer: 2948

Explanation:

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

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

$k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}$

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 = $1.21\times 10^{-4}years^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

5 0

2 years ago

Methods scientist use to determine a change in physical or chemical change in an Item

forsale [732]

They'd observe any new substances or new color, and temp. that is irreversible.

If this helped and you have any other questions, feel free to comment on my wall. Hope this helped.

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3 years ago