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3 years ago

The number of neutrons in the nucleus of an atom can be calculated by

Chemistry

1 answer:

Bess [88]3 years ago

6 0

3 mass number- proton number

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Why is pure silicon a poor conductor at room temperature?

Georgia [21]

Because pure silicon is a perfect semiconductor.

For room temperature, it rarely conducts, you can search for the threshold temperature, the characteristic equation is fairly complicated.

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3 years ago

What makes the gravitational pull between the earth and the moon stronger than the gravitational pull between two people ?

lesya692 [45]

Answer: Mass

Explanation:

The moon and the Earth have a much higher gravitational pull than people because they weigh way more.

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3 years ago

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What appears to happen to the moon as it goes through the cycle ?

7nadin3 [17]

Answer:

The moon appears to change forms

Explanation:

As it rotates around Earth, sunlight only hits half of the moon which creates that impression

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3 years ago

How many moles are in 5.5 x 10-23 molecules of H2O

masha68 [24]

Answer:

0.914moles

Explanation:

The number of moles in a substance can be got by dividing the number of atoms/molecules/particles by Avagadro's constant (6.02 × 10^23).

That is;

number of moles (n) = number of atom (nA) ÷ 6.02 × 10^23

According to this question, there are 5.5 x 10-23 molecules of H2O

n = 5.5 x 10^23 ÷ 6.02 × 10^23

n = 0.914 × 10^(23-23)

n = 0.914 × 10^0

n = 0.914 × 1

n = 0.914moles

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3 years ago

How would you prepare 1.00 L of a 0.400M solution of copper(II)sulfate, CuSO4?

Ber [7]

We need to dilute 0.400 mol of copper (II) sulfate, how do we know, how many weigh of $CuSO_4$ we have to dilute??

It's simple.

$\eta=\frac{m}{MM}$

Using a periodic table we can find the molar mass of $Cu,~~S~~and~~O$

$MM_{CuSO_4}=153.9~g/mol$

Then

$m=\eta*MM$

now we can replace it

$m=0.400*159.6$

$\boxed{\boxed{m=63.84~g}}$

Then we have to dilute 63.84 grams of copper (II) sulfate in 1 L of water to obtain a solution with 0.400M

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3 years ago

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