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Rama09 [41]
3 years ago
7

How many places are there for electrons in the third shell of an atom?

Chemistry
1 answer:
Dafna1 [17]3 years ago
7 0
Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.
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Al2(CO3)3
Alborosie

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Explanation:

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3 years ago
Select the correct answer.
bazaltina [42]

C. Magma from venus mantle erupted as lava.

Explanation:

A volcano is a land form which results from the eruption of molten rocks (lava) on the surface. Volcanic rocks are a special type of igneous rock that forms when molten rock cools and solidifies on the surface.

For a planet like Venus which is presently not active and little to no movement occurs within the plates, the volcanisim must have occurred when the planet was relatively young and it must have been millions of years ago.

It is widely believed that Venus was geologically active in times past. Mantle generated lava must have solidified on the surface in times past to have formed the volcano.

Evaluating other options:

Impact of space objects on Venus would lead to the formation of a crater which is a depression on the surface. The rock would be mostly metamorphic.

If water was ever present in Venus, they would have produced sedimentary rocks instead. The erosive power of water is not high enough to cut through the crust. Also, water would not aid the formation of volcanoes.

Heat is not enough to from volcanoes. Other factors are also in play.

5 0
3 years ago
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kipiarov [429]

Density does not change with the amount of matter.

The density of water is 1 g/mL whether you have 1 mL or 1000 mL of water. Density is an i<em>ntensive </em>property.

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5 0
3 years ago
How many moles of oxygen are prosent in 169 of oxygen gas?​
slamgirl [31]

Answer:

Number of moles=Mass/ Molar Mass 169g÷32g/mol= 5.281 mol

6 0
3 years ago
Read 2 more answers
How many hours will it take for the concentration of methyl isonitrile to drop to 14.0 %% of its initial value?
tiny-mole [99]

This is an incomplete question, here is a complete question.

The rearrangement of methyl isonitrile (CH₃NC) to acetonitrile (CH₃NC) is a first-order reaction and has a rate constant of 5.11 × 10⁻⁵ s⁻¹ at 472 K. If the initial concentration of CH₃NC is 3.00 × 10⁻² M :

How many hours will it take for the concentration of methyl isonitrile to drop to 14.0 % of its initial value?

Answer : The time taken will be, 10.7 hours

Explanation :

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 5.11\times 10^{-5}s^{-1}

t = time passed by the sample  = ?

a = let initial amount of the reactant  = 100

a - x = amount left after decay process = 14 % of 100 = 14

Now put all the given values in above equation, we get

t=\frac{2.303}{5.11\times 10^{-5}}\log\frac{100}{14}

t=38482.72s=\frac{38482.72}{3600}=10.7hr

Therefore, the time taken will be, 10.7 hours

7 0
3 years ago
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