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3 years ago

DNA is an example of a: O A. Compound B. Element c. Mixture D. Atom

Chemistry

1 answer:

Simora [160]3 years ago

5 0

Answer:

The answer is option A.

Compound

Hope this helps you

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A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final

alekssr [168]

Answer:

208.7°C was the initial temperature of the limestone.

Explanation:

Heat lost by limestone will be equal to heat gained by the water

$-Q_1=Q_2$

Mass of limestone = $m_1=62.6 g$

Specific heat capacity of limestone = $c_1=0.921 J/g^oC$

Initial temperature of the limestone = $T_1=?$

Final temperature = $T_2$ =T = 51.9°C

$Q_1=m_1c_1\times (T-T_1)$

Mass of water= $m_2=75.0 g$

Specific heat capacity of water= $c_2=4.186 J/g^oC$

Initial temperature of the water = $T_3=23.1^oC$

Final temperature of water = $T_2$ =T = 51.9°C

$Q_2=m_2c_2\times (T-T_3)$

$-Q_1=Q_2$

$-(m_1c_1\times (T-T_1))=m_2c_2\times (T-T_3)$

On substituting all values:

$-(62.6 g\times 0.921 J/g^oC\times (51.9^oC-T_1))=75.0 g\times 4.186 J/g^oC\times (51.9^oC-23.1^oC)$

$T_1=208.7^oC$

208.7°C was the initial temperature of the limestone.

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3 years ago

The atoms of platinum and silver are identical (true or false)

koban [17]

Answer:

I think it's false but not sure

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2 years ago

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In a chemical reaction, a certain compound changes intoanother compound at a rate proportional to the unchanged amount. ifinitia

Nadya [2.5K]

No it will be a 10% of that balance so take 16 * 10% and then take that answer and divide bye 70%

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3 years ago

Select all that are True.

givi [52]

Answers a
Explanation
Because it removes all the energy in the form of heat

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2 years ago

Which is the answer please help

djyliett [7]

Answer:

The outermost energy shell of an atom likes to be full with 8 electons

Explanation:

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2 years ago

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