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3 years ago

Which substance has the higher boiling point: CH3CH2CH3 or CH3CH2CH2CH2CH3? Explain.

1 answer:

5 0

Intermolecular forces are at work and determine boiling points.

In alkanes there are only carbon and hydrogen. The partial charge of the carbon of one molecule is only weakly attracted to the hydrogen partial charge of a neighbouring molecule. These weak intermolecular forces result in a low boiling point as they are easily broken.

Alcohol terminates on a OH group. The intermolecular forces between the partial charge of Oxygen and a hydrogen of a neighbouring molecule is significantly stronger, resulting in a significantly higher boiling point.

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The correct answer is c

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2 years ago

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How many molecules would be in 2.5 moles of H2O.show work

Fantom [35]

Answer:

1.5x 10^24

Explanation:

for every 1 mol there are 6.02 x 10^23 molecules

2.5 mol x 6.02 x 10^23

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1 mol

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2 years ago

Identify unit of measure would be most appropriate to measure the distance between two planets in our solar system

Damm [24]

The astronomical unit or also know as AU. Scientists use this because it’s convenient and easier to understand! Hope this helps ;)

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3 years ago

A sample of N2 gas in a flask is heated from 27 Celcius to 150 Celcius. If the original gas is @ pressure of 1520 torr, what is

Romashka [77]

Answer:

$\large \boxed{\text{B.) 2.8 atm}}$

Explanation:

The volume and amount are constant, so we can use Gay-Lussac’s Law:

At constant volume, the pressure exerted by a gas is directly proportional to its temperature.

$\dfrac{p_{1}}{T_{1}} = \dfrac{p_{2}}{T_{2}}$

Data:

p₁ = 1520 Torr; T₁ = 27 °C

p₂ = ?; T₂ = 150 °C

Calculations:

(a) Convert the temperatures to kelvins

T₁ = ( 27 + 273.15) K = 300.15 K

T₂ = (150 + 273.15) K = 423.15 K

(b) Calculate the new pressure

$\begin{array}{rcl}\dfrac{1520}{300.15} & = & \dfrac{p_{2}}{423.15}\\\\5.064 & = & \dfrac{p_{2}}{423.15}\\\\5.064\times423.15&=&p_{2}\\p_{2} & = & \text{2143 Torr}\end{array}\\$

(c) Convert the pressure to atmospheres

$p = \text{2143 Torr} \times \dfrac{\text{1 atm}}{\text{760 Torr}} = \textbf{2.8 atm}\\\\\text{The new pressure reading will be $\large \boxed{\textbf{2.8 atm}}$}$

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2 years ago

A runner travels at a constant speed of 4 m/s. What happens to the velocity of the runner when the runner changes direction?

ANTONII [103]

Answer:

4m/s in the direction of the turn

Explanation:

The velocity of an object is the rate of change of its position with respect to a frame of reference.

Assuming the runner stays the same speed as he turns, his velocity will be 4m/s in the speed he turns.

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2 years ago