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3 years ago

Which scientist was first to extensively develop the theory of continental drift?

Chemistry

2 answers:

fiasKO [112]3 years ago

7 0

Answer:

Alfred Wegener

Explanation:

K12

Simora [160]3 years ago

4 0

A. Alfred Wegener

hope that helps you :) ✨

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An atom of 105In has a mass of 104.914558 amu. Calculate the binding energy in MeV per NUCLEON. Enter your answer with 3 signifi

joja [24]

Answer:

8.46

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Also, atomic number of I = 549

Thus, the number of protons = 49

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

105 = 49 + Number of neutrons

Number of neutrons = 56

Mass of neutron = 1.008665 amu

Mass of proton = 1.007825 amu

Calculated mass = Number of protons*Mass of proton + Number of neutrons*Mass of neutron

Thus,

Calculated mass = (49*1.007825 + 56*1.008665) amu = 105.868665 amu

Mass defect = Δm = |105.868665 - 104.914558| amu = 0.954107 amu

The conversion of amu to MeV is shown below as:-

1 amu = 931.5 MeV

So, Energy = 0.954107*931.5 MeV/atom = 888.750671 MeV/atom

Also, 1 atom has 105 nucleons (Protons+neutrons)

So, Energy = 888.750671 MeV/105nucleons = 8.46 MeV/nucleon

Answer:- 8.46

8 0

3 years ago

The energy required to start a reaction is called

V125BC [204]

Answer:

activation energy would be your answer here

Explanation:

4 0

3 years ago

A 240g hydrated sodium sulphide contains 162g of water of crystallisation. What is the correct molecular formula for this compou

den301095 [7]

A 240g hydrated sodium sulphide contains 162g of water of crystallisation. What is the correct molecular formula for this compound?
Answer is A

8 0

3 years ago

What is the relationship between plants soil and fertilizers?

natta225 [31]

Answer: “ They add organic matter contributing to soil health increasing both the water-holding capacity and cation exchange capacity. They stimulate microbial activity and improve soil structure. Organic fertilizers also are valuable sources of micronutrients to plants. “ (the person above is correct)

3 0

3 years ago

If 14 moles of Oxygen burn how many moles of water are created? *

andrey2020 [161]

Answer:

A) 12 mol H2O.

Explanation:

Hello,

In this case, for the given reaction:

$2C_2H_6+7O_2\rightarrow 4CO_2 + 6 H_2O$

We notice that oxygen is in a 7:6 molar relationship with water, for that reason, the resulting moles of water turn out:

$n_{H_2O}=14molO_2*\frac{6molH_2O}{7molO_2} \\\\n_{H_2O}=12molH_2O$

Thus, the answer is A) 12 mol H2O.

Best regards.

6 0

3 years ago