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3 years ago

Which of the following elements does NOT form a diatomic molecule?

1 answer:

5 0

Magnesium(Mg) does not forms diatomic molecules.
The name of the compound CuCl2 is copper(ll)chloride.
Hope this helps you.

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you apply a 200 noon force for 10 seconds to push a wheelbarrow a distance of 100 m calculate your power

Luda [366]

I believe the answer is this (sorry if it’s a bit dark

5 0

3 years ago

Which compound is correctly balanced by charge in the following reaction?

Mumz [18]

Answer:A,D

Explanation:

Option a:

Sodium has charge $+1$

Hydroxide has charge $-1$ .

So,sodium hydroxide is balanced.

Option b:

Magnesium has charge $+2$

Two sulphates has a charge of $-2\times 2=-4$ .

So,magnesium sulphate is not balanced.

Option c:

Magnesium has charge $+2$

Two hydroxides have a charge of $2\times -1=-2$ .

So,magnesium hydroxide is balanced.

Option d:

Sodium has charge $+1$

Sulphate has charge $-2$ .

So,sodium sulphate is not balanced.

6 0

4 years ago

15 POINTS PLEASE HELP What volume of water must be added to 35mL of 2.6m KCl to reduce its concentration to 1.2m? Please explain

BartSMP [9]

First, find the volume the solution needs to be diluted to in order to have the desired molarity:
You have to use the equation M₁V₁=M₂V₂ when ever dealing with dilutions.

M₁=the starting concentration of the solution (in this case 2.6M)
V₁=the starting volume of the solution (in this case 0.035L)
M₂=the concentration we want to dilute to (in this case 1.2M)
V₂=the volume of solution needed for the dilution (not given)

Explaining the reasoning behind the above equation:
MV=moles of solute (in this case KCl) because molarity is the moles of solute per Liter of solution so by multiplying the molarity by the volume you are left with the moles of solute. The moles of solute is a constant since by adding solvent (in this case water) the amount of solute does not change. That means that M₁V₁=moles of solute=M₂V₂ and that relationship will always be true in any dilution.

Solving for the above equation:
V₂=M₁V₁/M₂
V₂=(2.6M×0.035L)/1.2M
V₂=0.0758 L
That means that the solution needs to be diluted to 75.8mL to have a final concentration of 1.2M.

Second, Finding the amount of water needed to be added:
Since we know that the volume of the solution was originally 35mL and needed to be diluted to 75.8mL to reach the desired molarity, to find the amount of solvent needed to be added all you do is V₂-V₁ since the difference in the starting volume and final volume is equal to the volume of solvent added.
75.8mL-35mL=40.8mL
40.8mL of water needs to be added

I hope this helps. Let me know if anything is unclear.
Good luck on your quiz!

5 0

4 years ago

What will occur if the velocity of the gas molecules colliding with the sides of the container increases?

yanalaym [24]

The pressure of the gas will increases

6 0

3 years ago

Read 2 more answers

Which of these structures are found in both plant and animal cells?

dlinn [17]

Answer:

the cell wall for sure not to sure about the others

6 0

3 years ago