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3 years ago

Which compound in the picture has a central atom with four outside atoms and has at least one nonpolar bond.

Chemistry

1 answer:

hodyreva [135]3 years ago

4 0

Answer:

The answer is:

Explanation:

The compound in Option B is Methane.

Methane is known to be a compound which has two elements, carbon and hydrogen. It has a central atom which is surrounded by four hydrogen atoms. It's chemical formula is CH4.

Methane's outer atoms are dipoles and are in the same direction. This makes the overall molecule non-polar. The compound itself has non-polar bonds and it is non-polar itself.

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Which of these common substances is a homogeneous mixture

algol [13]

Answer - Pure water

Reasoning - Can be stirred into the water to form homogeneous :).

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4 years ago

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Pla helppp due in 5 minutes!!..

Doss [256]

G o o g le (particle arrangements for solids) etc itll give you good images and just draw them in !

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3 years ago

Determine the overall reaction and its standard cell potential (in V) at 25°C for the reaction involving the galvanic cell made

mel-nik [20]

Answer:

Standard cell potential is 0.56V

Explanation:

Standard reduction potential ( $E^{0}$ ) are given below-

$E_{Cu^{+}\mid Cu}^{0}=0.52V$

$E_{Fe^{3+}\mid Fe}^{0}=-0.04V$

As $E_{Cu^{+}\mid Cu}^{0}$ is greater than $E_{Fe^{3+}\mid Fe}^{0}$ therefore Fe will be oxidized to $Fe^{3+}$ and $Cu^{+}$ will be reduced to Cu

Oxidation: $Fe(s)-3e^{-}\rightarrow Fe^{3+}(aq.)$

Reduction: $Cu^{+}(aq.)+e^{-}\rightarrow Cu(s)$

------------------------------------------------------------------------------------------------------

Overall: $Fe(s)+3Cu^{+}(aq.)\rightarrow Fe^{3+}(aq.)+3Cu(s)$

Standard cell potential, $E_{cell}^{0}=E_{Cu^{+}\mid Cu}^{0}-E_{Fe^{3+}\mid Fe}^{0}=(0.52+0.04)V=0.56V$

3 0

4 years ago

What is the total mass of NaNO3 that must be added to 70g in 100 grams of H2O to make a saturated solution at 30°C ?

dimulka [17.4K]

Answer:

58g

Explanation:

In order to solve this problem, you must take a look at the solubility graph for potassium nitrate.

Now, the solubility graph shows you how much solute can be dissolved per 100g of water in order to make an unsaturated, a saturated, or a supersaturated solution.

You're looking to make a saturated potassium nitrate solution using

50g of water at 60∘C. Your starting point will be to determine how much potassium nitrate can be dissolved in 100g of water at that temperature in order to have a saturated solution.

As you can see, the curve itself represents saturation.

If you draw a vertical line that corresponds to 60∘C and extend it until it intersects the curve, then draw a horizontal line that connects to the vertical axis, you will find that potassium has a solubility of about

115g per 100g of water. Your answer is 58g of potassium nitrate

7 0

4 years ago

Adrenaline is the hormone that triggers the release of extra glucose molecules in times of stress or emergency. A solution of 0.

kow [346]

Explanation:

The work is to calculate the molar mass of the solute (adrenaline) from the elevation of the boling point and compare with the mass of the structural formula. If they both are reasonably equal then you conclude that the results are in agreement, else they are not in agreement.

Since, you did not include the structural formula, I can explain the whole procedure to calculate the molar mass from the boiling point elevation, and then you can compare with the mass of the structural formula that only you know.

Determination of the molar mass from the boiling point elevation.

1) With the elevation of the boiling point, which is a colligative property, you can find the molality of the solution, using the formula:

ΔTb = i * Kb * m

Where:

> ΔTb is the increase of the boiling point of ths solvent, i.e. CCl4.

> i van't Hoff constant = 1 (because the solute is non ionic)

> m is the molality of the solution

2) Clearing m you get:

m = ΔTb / Kb

Kb is a datum that you must find in a table of internet (since the statement does not include it).

I found Kb = 5.02 °C/m

Then, m = 0.49°C / (5.02°C/m) = 0.09760956 m

3) With m and the mass of solvent you find the number of moles of solute using the formula:

m = number of moles of solute / kg of solvent

You have the mass of the solvent = 36.0 g = 0.0360 kg, so you can solve for the number of moles of solute:

=> number of moles of solute = m * kg of solvent = 0.09760956 m * 0.036kg = 0.0035139 moles

4) With the nuimber of moles and the mass you find the molar mass:

molar mass = mass in grams / number of moles = 0.64 g / 0.0035139 moles = 182 g/mol <------------- this is the important result

5) Now that you have the molar mass you can compare with the mass of the molecular formula. If they are reasonably equal then you conclude that the <span>molar mass of adrenaline calculated from the boiling point elevation is in agreement with the structural formula</span>

3 0

3 years ago