4 years ago

Explain in complete sentences how a convection current is created.

1 answer:

3 0

Convection currents are caused by the movement of the magma in the mantle.

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Radon (Rn) is the heaviest, and only radioactive, member of Group 8A(18) (noble gases). It is a product of the disintegration of

Serggg [28]

Given data Atomic mass of Ra= 226g/mol

no. of moles =1.0/226g/mol =0.04424moles

no. of atoms in 0.044moles

no. of atoms =no. of moles x avogadro's number

= 0.044x 6.022 x10^23 = 0.264968 x 10^22

If 10^15 atoms of Ra produce 1,373*10^4 atoms of<u> Rn per second</u> then 2,66 *10^21 forms 3,658*10^10 atoms of Rn per second.

Day has 246060=86400 s

That means that 2,66x10^21 atoms of Ra produces 3,16 x10^15 atoms of Rn in a day.

N(Rn)=3.16* 10 ^15 n(Rn)=N/NA

n(Rn)=5,25*10−9 pV=nR*T

T=273.15K R=8,314

p=101325Pa V=n∗R∗T/p

V=5.25∗10^−9 ∗ 8.314 ∗ 273.15 / 101325

V=1.1810^−10 m^3 = 118 x10^-7 liters of Rn, measured at STP, are produced per day by 1.0 g of Ra

To know more about Ra here

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2 years ago

3. What kind of mixture does each mixture have?

Ilia_Sergeevich [38]

Answer:

heterogeneous and homogeneous

Explanation:

la po ba abc?

5 0

3 years ago

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Nacl is a formula unit made of 1 sodium (Na) atom and 1 chlorine (Cl) atom. What is the average mass of 1 molecule of NacI?

wariber [46]

The average mass is 58.44 g

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3 years ago

A. draw the structure of the tetrahedral intermediate initially formed in the reaction shown. you do not have to consider stereo

julsineya [31]

The reaction is shown below, Acid protonates the carbonyl oxygen and makes the carbonyl carbon more electrophilic. Water attacks on activated carbonyl group and forms a tetrahedral intermediate.

Intermediate:
Structure of Intermediate is shown both in 2-D and 3-D (below attached).

Carbonyl group is regenerated with the elimination of ethanol.

Reaction is as below, The final product is carboxylic acid.

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3 years ago

A 5 Complete the sentences using words from the list. You may use them once, more than once, or not at all.

Mashutka [201]

Answer

Number 1. increase

number 2 . decrease

number 3. decrease

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2 years ago