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3 years ago

What about these questions

Chemistry

1 answer:

Oksanka [162]3 years ago

4 0

Again great job! They all look correct except 20. is 3.7 due to sig fig of least precision, which you have a mark by!! You don't even need help!;) Here comes the next chemical engineer! :)

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Can one mole of peas fit inside your house? List the materials and steps of an experiment that answers the

svlad2 [7]

Answer:

No.

Explanation:

No, one mole of peas do not fit inside a house because one mole is equals to 6.022 × 10²³ units which is a very large value. mole only use for atoms, ions and molecules etc due to very small size but mole is not used for big sized materials such as peas and other vegetables etc. So that's why we can conclude that one mole of peas did not fit inside a house.

6 0

2 years ago

Help me answer this question pls

Nostrana [21]

The answer should be D all of the above

3 0

3 years ago

Read 2 more answers

Water is poured into a conical container at the rate of 10 cm3/sec. The cone points directly down, and it has a height of 20 cm

8090 [49]

Answer:

\frac{dh}{dt}_{h=2cm} =\frac{40}{9\pi}\frac{cm}{2}

Explanation:

Hello,

The suitable differential equation for this case is:

$\frac{dV}{dt}=10\frac{cm^3}{s}$

As we're looking for the change in height with respect to the time, we need a relationship to achieve such as:

$\frac{dh}{dt} = ?*\frac{dV}{dt}$

Of course, $?=\frac{dh}{dV}$ .

Now, since the volume of a cone is $V=\pi r^2h/3$ and the ratio $r/h=15/20=3/4$ or $r=3/4h$ , the volume becomes:

$V=\pi (\frac{3}{4} h)^2h/3= \frac{3}{16}\pi h^3$

We proceed to its differentiation:

$\frac{dV}{dh} =\frac{9}{16} \pi h^2\\\frac{dh}{dV} =\frac{16}{9 \pi h^2}$

Then, we compute $\frac{dh}{dt}$

$\frac{dh}{dt} = \frac{16}{9 \pi h^2}*\frac{dV}{dt}\\\frac{dh}{dt} = \frac{16}{9\pi h^2}*10\frac{cm^3}{s} =\frac{160}{9 \pi h^2}$

Finally, at h=2:

$\frac{dh}{dt}_{h=2cm} =\frac{160}{9\pi 2^2}\\\frac{dh}{dt}_{h=2cm} =\frac{40}{9\pi}\frac{cm}{s}$

Best regards.

4 0

3 years ago

If a reaction has a very low activation energy, the products would be expected to form quickly at high temperatures. Select the

melamori03 [73]

Answer: Option (c) is the correct answer.

Explanation:

It is known that when Gibb's free energy, that is, $\Delta G$ has a negative value then the reaction will be spontaneous and the formation of products is favored more rapidly.

Activation energy is defined as the minimum amount of energy required to initiate a chemical reaction.

So, when reactants of a chemical reaction are unable to reach towards its activation energy then a catalyst is added to lower the activation energy barrier so the reaction can take place rapidly.

Since, the given reaction has low activation energy. Therefore, there is no need to add a catalyst.

And, when value of $\Delta G$ is positive then the reaction is spontaneous in nature and formation of products is less favored.

Thus, we can conclude that for the given situation positive delta G is the reason that a reaction might form products very slowly, or not at all.

8 0

3 years ago

Read 2 more answers

Determine the expression for the equilibrium constant, KcKcK_c, for the reaction by identifying which terms will be in the numer

Yakvenalex [24]

Answer: Hello your question lacks some details below is the complete question

answer :

Numerator = CH₃OH

Denominator = (CO ) ( H₂)²

Explanation:

CO + 2H₂ ⇄ CH₃OH ( formation of methanol )

hence for the equilibrium constant Kc

Numerator = CH₃OH

Denominator = (CO ) ( H₂)²

<u><em>Placing into the Bin </em></u>

Numerator : CH₃OH

Denominator : (CO ) ( H₂)²

Not Used : ( CO )² , H₂ , ( CH₃OH ) ²

8 0

2 years ago