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2 years ago

How much heat in Joules is needed for an increase in temperature by 12.5 degrees of an 8 gram block of gold

Chemistry

1 answer:

Vinil7 [7]2 years ago

4 0

Answer: 13

Explanation:

$Q=mc \Delta T\\\\Q=(8)(0.13)(12.5)\\\\Q=\boxed{13}$

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A radioisotope decays to give an alpha particle andPb-208.

oee [108]

Answer: The original element is $_{84}^{212}\textrm{Po}$

Explanation:

Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units.

The released alpha particle is also known as helium nucleus.

$_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha$

For the given alpha decay process of an isotope:

$^{Z}_{A}\textrm{X}\rightarrow ^{208}_{82}\textrm{Pb}+_2^4\alpha$

To calculate A:

Total mass on reactant side = total mass on product side

A = 208 + 4

A = 212

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

Z = 82 + 2

Z = 84

The isotopic symbol of unknown element is $_{84}^{212}\textrm{Po}$

Hence, the original element is $_{84}^{212}\textrm{Po}$

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3 years ago

Which of the following actions describes nuclear fusion

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C it is combining the nuclei to become bigger

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How are sea slugs able to make their own food like green algae?

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C. They are genetically capable of making chlorophyll

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Give two properties that glass and plastic sometimes share.

dmitriy555 [2]

Answer:

Wall, cup, mug, plastic spoon

Explanation:

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Laws differ from theories because laws do not provide

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