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3 years ago

Would a salt-cured egg be a physical or chemical change?

Chemistry

1 answer:

Vera_Pavlovna [14]3 years ago

5 0

Answer:

I believe it is a physical change

Explanation:

The telltale sign of a chemical change is the formation of a new substance. They also usually involve the production of energy (heat, light, sound etc.)

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Type the appositive phrase in this sentence. "cookies with chocolate chunks," the winning recipe, received $100.

Ymorist [56]

Answer is: the winning recipe.
An appositive is a noun or noun phrase that renames another noun right beside it. The appositive can be a short or long combination of words.
Another example: Problem number 19, the final question, was difficult - the final question is the appositive phrase in this sentence.

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4 years ago

In a chemical reaction, [_____] are the substances present after the reaction.

worty [1.4K]

Answer:

Products

Explanation:

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3 years ago

Solids and liquids have both mass and volume, but a gas has only mass. a. True b. False

tino4ka555 [31]

True. A gas does not have a definite volume. Therefore, making this statement correct.

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3 years ago

An iron ore sample weighing 0.5562 g is dissolved HCl (aq), and the iron is obtained as Fe2 in solution. This solution is then t

erik [133]

Answer:

$\% Fe^{+2}=70%$

Explanation:

Hello,

In this case, we could considering this as a redox titration:

$Fe^{+2}+(Cr_2O_7)^{-2}\rightarrow Fe^{+3}+Cr^{+3}$

Thus, the balance turns out (by adding both hydrogen ions and water):

$Fe^{+2}\rightarrow Fe^{+3}+1e^-\\(Cr_2^{+6}O_7)^{-2}+14H^++6e^-\rightarrow 2Cr^{+3}+7H_2O\\\\6Fe^{+2}+(Cr_2^{+6}O_7)^{-2}+14H^++6e^-\rightarrow Cr^{+3}+7H_2O+6Fe^{+3}+6e^-$

Thus, by stoichiometry, the grams of Fe+2 ions result:

$m_{Fe^{+2}}=0.04021\frac{molK_2Cr_2O_7}{L}*0.02872L*\frac{6molFe^{+2}}{1molK_2Cr_2O_7}*\frac{56gFe^{+2}}{1molFe^{+2}}=0.388gFe^{+2}$

Finally, the mass percent is:

$\% Fe^{+2}=\frac{0.388g}{0.5562g}*100\%\\ \% Fe^{+2}=70%$

Best regards.

8 0

3 years ago

How many CO2 molecules are present in 12.47 L CO2

Ipatiy [6.2K]

Take the given 12.47L then divide that by 22.4L then multiply it by 1 mole of CO2 then divide by 1 mole of CO2 then multiply by 6.02x10^23. Giving you an answer of 3.35^23 molecules of CO2

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4 years ago