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3 years ago

Coal and petroleum are alike in which fundamental way?

1 answer:

5 0

Coal a is a chemical compound. It is pure carbon. You cannot separate carbon into other molecules without changing its chemical consitution.

Petroleum is a mixture of many chemical compounds, hydrocarbons, plus other elements. Petroleum components contain carbon, hydrogen, oxygen, nitrogen, sulfur, and some metal traces. The different compounds that consitute the petroleum can be separated by physical media like distillation.

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Model 1-How is a cell like a factory

anastassius [24]

A cell is like a factory in many ways.

For one, the cell typically contains many organelles that have several varying functions. In a factory, you have many workers who perform different tasks, just as the organelles in the cell do.

Another reason is that cells contain a nucleus or the boss/brain of the cell. In factories, this could be considered the boss of the workplace that tells each and every worker, or organelle, what to do.

The selectively permeable membrane of a cell also resembles a factory as it only lets in workers or special guests. The cell's membrane only lets in specific materials, hence the selectively permeable membrane.

These are just a few ways as to how the cell is like a factory.

Hope this helps!

8 0

3 years ago

(b) what is the ph of a solution containing 0.03m benzoic acid (pka 3.19) and 0.02m nabenzoate?

Makovka662 [10]

Answer is: pH of solution is 3,02.
c(benzoic acid) = 0,03 mol/dm³.
c(sodium benzoate) = 0,02 mol/dm³.
pKa(benzoik acid) = 3,19.
pH = ?
Henderson–Hasselbalch equation for buffers: pH = pKa + log(cs/ck)
pH = 3,19 + log(0,02/0,03)
pH = 3,19 - 0,176
pH = 3,02.
cs - concentration of acid.

5 0

3 years ago

A sample consisting of 2 moles He is expanded isothermally at 0 degrees from 5.0dm3 to 20.0dm3. Calculate w, q and deltaU for ea

FinnZ [79.3K]

Answer:

i) $\Delta U=0 w=-6293 J q=6293 J$

ii) $\Delta U=0 w=-3404,52 J q=3404,52 J$

ii) $\Delta U=0 w=0 J q=0 J$

Explanation:

As the initial and final states of the sample are the same, the ΔU of the sample is, for the three cases

$\Delta U=n.C_{V}.\Delta T=0$ since $\Delta T=0$

i)Reversibly $P_{ext} =P_{sys}$ so $w$ can be calculated by

$w=-n.R.T.ln(\frac{V_{f}}{V_{i}})=-2 \times 8.314\frac{J}{mol K} \times 273,15K \times ln(\frac{}{5dm^{3}})=-6293 J$

and because of the first law of thermodynamics

$q=-w=6293 J$

ii)Irreversibly with $P_{ext} =P_{f}$

we can calculate $P_{f}$ by the law of ideal gases

$P_{f} =\frac{n\times R\times T}{V_{f}} =\frac{2\times 0.082\frac{dm^{3}atm}{mol K}\times 273,15K}{20dm^{3}} =2,24 atm$

then w can be calculated by

$w=-P_{ext} \times \Delta V=-2,24 atm \times (20-5) dm^{3} \times frac{101.325J }{atm dm^{3}=-3404,52J$

and

$q=-w=3404,52J$

iii)a free expansion $P_{ext}$ so $w=0$ (there's no work at vaccum) and $q=-w=0$

7 0

3 years ago

Drought is a weather condition. true or false

ANTONII [103]

Answer:

true

Explanation:

drought is a period of unusually persistent dry weather that persists long enough to cause serious problems such as crop damage and/or water supply shortages. The severity of the drought depends upon the degree of moisture deficiency, the duration, and the size of the affected area.

7 0

3 years ago

Which of the following equations represents photosynthesis?

iren2701 [21]

The equation that represents photosynthesis is ,

$6CO_2 + 6 H_2O —> C_6H_12O_6 + 6 O_2$

The correct option is (c).
——————————
What is photosynthesis?

•This is process performed by green plants to prepare its food using sunlight and carbon dioxide.

•Oxygen and Glucose are the products obtained after photosynthesis.

•This process takes place in chlorophyll of a cell(in chloroplasts)

•These are of two types , light dependent reactions and light independent reactions

•This is was first discovered by Jan Ingenhouse.

4 0

1 year ago