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4 years ago

Atoms of elements in the same group have the same number of

Chemistry

1 answer:

tresset_1 [31]4 years ago

6 0

Answer:

The elements of same group have similar chemical properties because they have same number of valence electrons.

Explanation:

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Why a real diamond that is made in a laboratory under great heat and pressure is not a mineral.

Ierofanga [76]

Answer:

A “Lab Diamond” is just like a Natural Diamond, except instead of growing in the Earth, they grow in a lab. The only chemical difference between Lab Diamonds vs Natural Diamonds is that most Natural Diamonds contain tiny amounts of nitrogen, and Lab Diamonds do not.

Explanation:

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3 years ago

What is the molar concentration (in moles/L) of a solution made with 3.744 g of Mg(NO3)2 dissolved in enough water to make 50.0

Annette [7]

Answer:

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

Explanation:

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$molarity=\frac{number of moles}{volume}$

In this case:

Mg: 24.3 g/mole
N: 14 g/mole
O: 16 g/mole

So, the molar mass of Mg(NO₃)₂ is:

Mg(NO₃)₂= 24.3 g/mole + 2*(14 g/mole + 3*16 g/mole)= 148.3 g/mole

So, if you have 3.744 g of Mg(NO₃)₂, you can apply the following rule of three: if 148.3 grams of Mg(NO₃)₂ are present in 1 mole, 3.744 grams in how many moles are present?

$moles=\frac{3.744 grams*1mole}{148.3 grams}$

moles= 0.025

Then you have:

number of moles=0.025
volume= 50 mL= 0.05 L (being 1,000 mL= 1 L)

Replacing in the definition of molarity:

$molarity=\frac{0.025 moles}{0.05 L}$

you get:

$molarity=0.5 \frac{moles}{L}$

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

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3 years ago

What particles are affecting by strong nuclear forces?

WINSTONCH [101]

Answer:

proton and neutron

I hope this helps :)

Explanation:

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3 years ago

What is it called when elements combine to form a chemical compound?

Alex73 [517]

Explanation:

A compound is a unique substance that forms when two or more elements combine chemically.
Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds.
A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons.

hope it helpful ✌️✌️

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3 years ago

11. Assuming that the gases are ideal, calculate the amount of work done (joules) in each of the following reactions at 25 degre

gayaneshka [121]

Answer:

For a: Work done for the given reaction is 2477.572 J.

For b: Work done for the given reaction is 0 J

Explanation:

To calculate the work done for the reaction, we use the equation:

$W=-P\Delta V$