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frutty [35]
3 years ago
14

What is the difference in atomic structure between Lead-205 and Lead-208?

Chemistry
1 answer:
Nataly_w [17]3 years ago
5 0

Answer:

  the number of neutrons in the nucleus

Explanation:

The mass number 205 is the total number of protons and neutrons in the nucleus. Lead has 82 protons, so a mass number of 205 indicates a nucleus with 123 neutrons.

Similarly, the mass number 208 indicates a lead nucleus with 126 neutrons.

The difference in atomic structure is the difference in the number of neutrons in the nucleus.

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Answer:

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Explanation:

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Why is a molecule of CO2 nonpolar even though the bonds between the carbon atom and the oxygen atoms are polar?
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3 years ago
Question 43 please. i’m not sure if i got the right answer
hram777 [196]

a) The reaction is exothermic since the overall enthalpy change is negative. this means that the system has lost energy to the environment, namely, the apparatus and due to drought.

b) We first calculate the number of moles in 3.55 grams of magnesium.

number of moles= mass/ atomic mass

                            =3.55/24

                            =0.1479 moles(to 4sf)

now, if 2 moles of magnesium give -1204kJ

        How much energy is given by 0.1479 moles

       = (0.1479×-1204kJ)

        =-89.0358kJ (don't forget the negative sign)

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then -234kJ will be produced by

=(-234kJ×2moles)/1204kJ

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=40.3g/40= 1.0075moles

if 2 moles of MgO give 1204 kJ then decomposing 1.0075 moles requires

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4 0
3 years ago
which process describe water changing from a liquid state to a gas? condensation evaporation infiltration precipitation
Bogdan [553]
<span>evaporation  is the process that describe changing of water from liquid to gas</span>
8 0
2 years ago
Read 2 more answers
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