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3 years ago

Chemistry hw due in 2 hours... HELP!!!

Chemistry

1 answer:

NeX [460]3 years ago

7 0

Answer:

36kcal

Explanation:

There are three things that occur in the process not converting ice to steam. They are;

I) fusion of ice

ii) heating of water to 100°C

iii) vaporization of water at 100°C to yield steam

Hence, total heat required to convert ice to steam=

Latent heat of fusion of ice + heat required to raise the temperature of water to 100°C + Latent heat of vaporization of water

Thus;

H= mLfus + mcθ + mLvap

H= m(Lfus + cθ + Lvap)

H= 50(80 + 1(100) + 540)

H= 36000cal

H= 36kcal

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For something to be considered a polar bond, what does the electronegativity difference have to be at a minimum?

kondor19780726 [428]

Answer: A bond in which the electromagnetically difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond.

Explanation:

There you go.... your welcome

4 0

3 years ago

A blimp floats because it is filled with helium gas (He) which has a smaller molecular mass than air (in g/mol). Helium can lift

Mumz [18]

Answer:

444 L

Explanation:

According to Archimedes the buoyancy force is equal to the weight of the displaced substance. In this case, the displaced substance is Air. So to calculate the lifting power of Helium, start with the weight of air in volume

Since the Helium itself has weight, we need to use the difference in density between air and helium.

We know that the density of air is 1.2 $kg/m^3$

Density of Helium is 0.1787 $kg/m^3$

To lift a object of 1 pound which is equal to 0.453 kg we need $\frac{0.453}{1.2-0.1787}=0.444$ $m^3$ helium There is 1000 liters in a $m^3$

So the required volume of helium= 0.444×1000=444 L

6 0

3 years ago

This graph shows two curves pertaining to a hydrogen s orbital.

fgiga [73]

Answer 1) : According to the complete question attached in the answer,

The radial wave function which is denoted by $R_{nl}(r)$ shown with orange color crosses through zero point. Also, At the the radial nodes, which are spherical shells to some radial distance away from the nucleus there no electron are found.

Also, the radial probability distribution curve denoted as $R^{2}_{nl}(r)$ shown in blue color is observed to touch zero, and shows the place of radial node.

Therefore, the total number of nodes will include both the kinds which has radial and angular nodes which will be represented by <em>'n'</em>.

It is observed that for any atomic orbital, the total number of nodes will be n-1 .

Considering the s orbital of the hydrogen, which has zero angular momentum (l); (l=0), as it has zero angular nodes.

Hence, there will be only radial nodes, which is

(n−1 = total number of radial nodes in s orbitals)

According to the image, there are 4 radial nodes shown, so n = 5 (as n-1 = 4; therefore, n = 5)

This represents the 5s orbital.

Answer 2) The radial nodes are observed in I'm seeing radial nodes at

$1.9a_{0}$ , $6.4a_{0}$ , $13.9a_{0}$ and $27.0a_{0}$ .

where $a_{0}$ represents the hydorgen bohr atomic radius = 0.0529177 nm

Explanation : It is quite easy to observe the given graph and find out the approximate values of the radial nodes, it does not requires any equation to be solved. Equation can be used to find the radial nodes if it was supplied along with the question. Although by mere speculation one can find out the answer.

3 0

3 years ago

Read 2 more answers

3) A saturated solution of PbCl2 in water was prepared and filtered. From the filtrate (solution collected after filtration), 50

qaws [65]

Answer: a) 0.0144mol/L

b) $1.19\times 10^{-5}$

Explanation:

Solubility product is defined as the equilibrium constant in which a solid ionic compound is dissolved to produce its ions in solution. It is represented as $K_{sp}$