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2 years ago

Move the red warning icon to focus of the earthquake.

Chemistry

1 answer:

lina2011 [118]2 years ago

8 0

Answer:

Red goes in the spiky yellow box. Green goes where the red circles are. Blue goes in the small yellow box that is pointing to the line.

Explanation:

The focus of an earthquake is where it starts in the earth. The epicenter is the part directly above the focus on the surface. The fault is the part where the earth's crust splits.

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the normal boiling point of ethanol is 78.3 and its molar heat of vaporization is 393. Calculate the vapor pressure of ethanol a

madam [21]

0.12 atm vapor pressure of ethanol at 45.0 C.

What is vapor pressure in science definition?

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.
The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.

We will use the Clausius-Clapeyron equation,

ln(P2/P1) = dHvap/R[1/T1-1/T2]

where,

P1 = unknown

P2 = 1 atm

T1 = 30 oC = 30 + 273 = 303 K

T2 = 78.3 oC = 78.3 + 273 = 351.3 K

dHvap = 39.3 kJ/mol = 39300 J/mol

R = 8.314 J/K.mol

Feed values,

ln(1/P1) = 39300/8.314[1/303 - 1/351.3]

P1 = 0.12 atm

thus, the vapor pressure at 30° C is 0.12 atm.

Learn more about vapor pressure

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8 0

1 year ago

B. which of the reef organisms are consumers?

asambeis [7]

Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.

Explanation:

6 0

2 years ago

Which of the following is the final fate of a very massive star?

STatiana [176]

D. Black holes

When a star dies out it explodes and causes a supernova and after a very long period of time the supernovas gasses vanish and the star can be visibly identified as a black hole!

8 0

3 years ago

Select the single best answer. Explain the observed trend in the melting points for four isomers of molecular formula C7H16. mp

damaskus [11]

Answer:

The ability of the molecule to pack more tightly increases the melting point.

Explanation:

In hydrocarbons of same molecular formula, melting point is determined by:

weak intermolecular forces
Molecular symmetry

Higher the intermolecular forces and molecular symmetry, higher will be the melting point.

Intermolecular forces in hydrocarbons decreases with branching. Moreover, branching interfere the tight packing of the molecule in the crystal. Therefore, branched hydrocarbons tend to have lower melting point.

However, in highly branched hydrocarbons molecular symmetry increases which results in tight packing of the molecule in the crystal.

So, highly tight packed molecules tend to have high melting point.

As (CH3)2CHC(CH3)3 is highly branched and has high molecular symmetry, therefore, its melting point is highest among given.

So, among the given, option c is correct.

5 0

2 years ago

Help this is due tmr

Goryan [66]

Answer:

the 3rd one

Explanation:

we learned about this already

8 0

2 years ago