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3 years ago

You take out your best silver spoons and notice that they are very dull and have some black spots, chemical or physical change?

Chemistry

2 answers:

lions [1.4K]3 years ago

5 0

Answer:

chemical

Explanation:

Just trust me.

il63 [147K]3 years ago

5 0

<h2>Answer :</h2>

The blackened spots on the spoons are nothing but silver sulfide . Silver sulfide is formed when silver comes in contact with moisture , vapour or sulphur . Since , they have said that some black spots could be seen , we can be sure that the silver has rusted from sulphur as only silver and sulphur can form silver sulfide , which is black in colour . Since there has been a change in the chemical composition of the sliver in the silver spoon ( silver into silver sulfide by sulphur ) we can say that the change that occurred here is a chemical change . Therefore , the dull black spots on the silver spoon are the results of a chemical change  .

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A certain atom has a mass of 16 and an atomic number of 7. What element is this ?

snow_tiger [21]

Answer:

Nitrogen

Explanation:

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2 years ago

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1 year ago

Calculate the mass defect for the formation of phosphorus-31. The mass of a phosphorus-31 nucleus is 30.973765 amu. The masses o

Nata [24]

Answer: The mass defect for the formation of phosphorus-31 is 0.27399

Explanation:

Mass defect is defined as the difference in the mass of an isotope and its mass number.

The equation used to calculate mass defect follows:

$\Delta m=[(n_p\times m_p)+(n_n\times m_n)]-M$

where,

$n_p$ = number of protons

$m_p$ = mass of one proton

$n_n$ = number of neutrons

$m_n$ = mass of one neutron

M = mass number of element

We are given:

An isotope of phosphorus which is $_{15}^{31}\textrm{P}$

Number of protons = atomic number = 15

Number of neutrons = Mass number - atomic number = 31 - 15 = 16

Mass of proton = 1.00728 amu

Mass of neutron = 1.00866 amu

Mass number of phosphorus = 30.973765 amu

Putting values in above equation, we get:

$\Delta m=[(15\times 1.00728)+(16\times 1.00866)]-30.973765\\\\\Delta m=0.27399$

Hence, the mass defect for the formation of phosphorus-31 is 0.27399

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2 years ago

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notsponge [240]

Explanation:

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3 years ago