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3 years ago

I NEED HELP PLEASE, THANKS! :)

Chemistry

1 answer:

Free_Kalibri [48]3 years ago

7 0

Answer:

Explanation:

Metallic character increases across a period to the left and downwards.

If you look at the periodic table, Cs is lower and more towards the left.

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A metallurgist reacts 250.0 grams of 76.0% by mass silver nitrate solution with an excess of copper

Tomtit [17]

The answer is option d

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3 years ago

When ethyl ether is heated with excess HI for several hours, the only organic product obtained is ethyl iodide. T/F

Anastasy [175]

Answer:

True

Explanation:

Ethers react with HI to form the corresponding alcohols and alkyl iodides.

Similarly, ethyl ether react with excess of HI to form ethanol and ethyl iodide. But in the excess of HI as mentioned in the question, ethanol too undergoes $S^{N}2$ reaction with HI to form ethyl iodide.

Hence, ethyl iodide is the only product when ethyl ether reacts with excess of HI for several hours.

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3 years ago

Consider the hypothetical reaction 3A + 4B → C + 2D Over an interval of 2.50 s the average rate of change of the concentration o

faust18 [17]

Answer:

Final [B] = 1.665 M

Explanation:

3A + 4B → C + 2D

Average rection rate = 3[A]/Δt = 4[B]/Δt = [C]/Δt = 2[D]/Δt

0.05600 M/s = 4 [B]/ 2.50 s

[B] = 0.035 M (concentration of B consumed)

Final [B] = initial [B] - consumed [B]

Final [B] = 1.700 M - 0.035 M

Final [B] = 1.665 M

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3 years ago

How does Dr.Hoffmann's ultrasound device benefit society? ( modern chemistry textbook page 180).

Masja [62]

She developed new models for emergency ultrasound education and competency assessment, created a successful emergency ultrasound fellowship program, and introduced electronic workflow solutions to Hopkins, increasing the use of emergency ultrasound by 7-fold.

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3 years ago

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Which equation represents a redox reaction?

labwork [276]

Answer:

D. $2NaBr + Cl_2\rightarrow 2NaCl + Br_2$

Explanation:

Hello!

In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:

Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:

$2NaBr + Cl_2\rightarrow 2NaCl + Br_2$

$Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-$

Unlike the other reactions whereas no change in the oxidation states is evidenced.

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3 years ago

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