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3 years ago

Which statement is true of a chemical change?

Chemistry

1 answer:

Feliz [49]3 years ago

6 0

Answer:

A is the answer. Chemical changes happen when atomic bonds are broken or created during chemical reactions. Hence, in this case, it involve changes to molecular structure.

- Change in states are physical changes.

- When salts are dissolved in water, you can use Distillation to separate them. Distillation is a physical change as well.

- Dissolving is just physical change.

Explanation:

The statement that is true of a chemical change among the statements given in the question is "It involves changes in the molecular structure". The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has actually come to your help.

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A chemist prepares a solution of magnesium chloride MgCl2 by measuring out 49.mg of MgCl2 into a 100.mL volumetric flask and fil

Flura [38]

Answer: Molarity of $Cl^-$ anions in the chemist's solution is 0.0104 M

Explanation:

Molarity : It is defined as the number of moles of solute present per liter of the solution.

Formula used :

$Molarity=\frac{n\times 1000}{V_s}$

where,

n= moles of solute

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{0.049g}{95g/mol}=5.2\times 10^{-4}moles$

$V_s$ = volume of solution in ml = 100 ml

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{5.2\times 10^{-4}moles\times 1000}{100ml}=5.2\times 10^{-3}mole/L$

Therefore, the molarity of solution will be $5.2\times 10^{-3}mole/L$

$MgCl_2\rightarrow Mg^{2+}+2Cl^-$

As 1 mole of $MgCl_2$ gives 2 moles of $Cl^-$

Thus $5.2\times 10^{-3}$ moles of $MgCl_2$ gives = $\frac{2}{1}\times 5.2\times 10^{-3}=0.0104$

Thus the molarity of $Cl^-$ anions in the chemist's solution is 0.0104 M

6 0

3 years ago

Which best describes an element?

Aleonysh [2.5K]

I think the answer is a pure substance

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3 years ago

A/An ______ bond occurs when 2 atoms share electrons.

allsm [11]

Answer:

convalent???????

Explanation:

sowwy if it wrong

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3 years ago

Which ion does not have a noble gas configuration in its ground state?

goldfiish [28.3K]

I think the answer would be Ga3+

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3 years ago

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Talja [164]

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