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2 years ago

What came first, Layer D or Rock E? Layer D Rock E

Chemistry

2 answers:

9966 [12]2 years ago

7 0

Layer d

i don’t have an explanation except the fact that d is older then r and older obviously comes first so

Leno4ka [110]2 years ago

6 0

Answer:

Layer D

Explanation:

First means older.

Rock E is an intrusion, so it is younger than all the layers it pass through. Apparently, Rock E is the youngest layer. So, Layer D is came before Layer E.

Hope this helps!

Have a great day :)

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65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large

Brilliant_brown [7]

Answer:

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large

deposit of dust that contained substances only found in asteroids, What most likely killed off the dinosaurs?

Explanation:

3 0

3 years ago

How many molecules of sodium oxide will be created if 187 grams of oxygen reacts with excess sodium? 4na o2 -> 2na2o

Leona [35]

Molecules of sodium oxide will be created if 187 grams of oxygen reacts with excess sodium will be 7.04 × 10 ²⁴ molecules.

Sodium oxide is Na₂O which is formed due to the reaction of sodium and oxygen.

Given,

Balanced chemical equation is :

4 Na(s) + O₂ (g) → 2Na₂O (s)

Now, the Mole ratio of O₂ and Na₂O is 1 mol O₂: 2 mol Na₂O

Molar mass O₂ = 32.00 g/mol

Now, let's find out the Number of moles of O₂ present in 187 grams of oxygen,

Number of moles of O₂ = Given mass in grams / molar mass of O₂

Number of moles of O₂ = 187 g / 32.00 g/mol

Number of moles of O₂ = 5.844 mol

Since, we know the Proportion is 1 mol O₂ : 2 mol Na₂O

Now, Number of moles of Na₂O required is,

2 mol Na₂O / 1 mol O₂ = 5.844 mol O₂ / x

x = 5.844 mol O₂ (2 mol Na₂O / 1 mol O₂)

x = 11.688 mol Na₂O

To calculate the Number of molecules of sodium oxide,

Number of molecules = Number of moles × Avogadro's number

Number of molecules = 11.688 mol × 6.022 × 10²³ molecules/mol =

Number of molecules = 7.04 × 10 ²⁴ molecules

Hence, the Number of molecules of sodium oxide required is 7.04 × 10²⁴ molecules.

Learn more about Sodium oxide here,

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2 years ago

Which of the following best helps to account for the fact that the F- ion is smaller than the O2- ion?

katrin [286]

Answer: Option (B) is the correct answer.

Explanation:

Both oxygen and fluorine are period 2 elements and when we move across a period then there occurs a decrease in atomic size of the atoms. Hence, the atomic radius of a neutral fluorine atom is smaller than a neutral oxygen atom.

Moreover, atomic number of fluorine is 9 and it has higher nuclear charge due to which it will cause more attraction of electrons. As a result, size of a fluorine ion will be smaller.

On the other hand, size of oxygen atom is larger and has small nuclear charge due to which attraction of electrons by its nucleus will not be strong enough. Hence, the size of $O^{2-}$ will be larger.

Thus, we can conclude that the statement $F^{-}$ has a larger nuclear charge than $O^{2-}$ has, is correct for the fact that the $F^{-}$ ion is smaller than the $O^{2-}$ ion.

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4 years ago

Cecilia and tegan are learning about things that dissolve in water. They put sugar into a cup of water and saw that the sugar be

damaskus [11]

Answer:

1. stir with a spoon

Explanation:

if you stir the water with a spoon, it quickens the process at which the sugar dissolves. The spoon you could say also speeds it all up. Think of it this way, a meteor entering earths atmosphere, will it get smaller faster going 50 mph, or 100mph? the regular is 50, but when you got the spoon, it increases (more gravity force on the meteor= that 100mph).

hope this helps.

8 0

3 years ago

Fine rice and wheat are homogeneous or heterogeneous

Tems11 [23]

Answer:Heterogeneous

Explanation:they can be separated by using the method of winnowing

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3 years ago