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Solnce55 [7]
2 years ago
14

On a warm summer day, a group of friends went swimming at the pool. They experienced hot, humid air at noon; but a few hours lat

er the temperature dropped, and a thunderstorm occurred. Which explanation below BEST describes what caused this event?
Chemistry
1 answer:
Nadya [2.5K]2 years ago
6 0

Answer:

hello dear, the question that you posted is incomplete but not to worry I will give you some key points in order to be able to answer this kind of question.

Explanation:

So, since we do not have the complete question, let us proceed this way; we are given that the season is a warm SUMMER day and the atmospheric condition or the weather is HOT, HUMID at noon but later in some few hours the TEMPERATURE DROPPED and then, a thunderstorm occurred.

(1). The fact that the weather is in a humid condition that is relative humidity will make it possible to absorb more moisture.

(2). Also, we have a HOT weather which means that the rate at which EVAPORATION take place is high.

(3). The drop in temperature means that water molecule has been absorb from the surface of the earth which also includes the water molecules that would have adhere to their bodies. The air expands and move up and as the air move up they become colder and later condensed and this is the cause of the THUNDERSTORM -- a conventional rainfall.

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Sodium acetate spontaneously crystallizes out of a supersaturated solution upon standing or upon the addition of a seed crystal.
AlekseyPX

Answer:

Option (c) is correct.

Explanation:

According to 2nd law of thermodynamics, every spontaneous process is associated with increase in entropy (\Delta S>0).

As sodium acetate crystallizes out spontaneously therefore it is associated with \Delta S>0.

During crystallization, bond formation takes place which results evolution of heat. In other words, crystallization phenomenon is exothermic (\Delta H).

So, the given crystallization process renders the following thermodynamic quantities- \Delta S>0 J/K and \Delta H J

Option (c) is correct.

6 0
2 years ago
A turtle moves at a speed of 1.0km/h. How fast is the turtle moving in meter per second (m/s)?
ahrayia [7]

Answer:

0.28m/s

Explanation:

Speed is defined as the distance travelled per unit of time. The speed of the turtle is 1.0km/h. Thus, to find the speed in m/s, we need to convert km to m (1km is 1000m), and h to s (1h = 3600s).

<em>Converting units:</em>

1.0km/h * (1000m / 1km) * (1h / 3600s) = 0.28m/s.

The speed of the turtle in meter per second is 0.28m/s

7 0
2 years ago
the mass of sample X is 20.0g. it was placed in a graduated cylinder and the water level rose from A to B. what is the density o
MatroZZZ [7]

Answer: 4.0 g/mL

Explanation:

The volume increased by 5.0 mL. Recall that the number of significant figures is equal to the number of certain values you can read plus one. Here, the volume increased from 14.0 mL to 19.0 mL, so the volume of X is 5.0 mL.

3 0
2 years ago
What is the total number of sp2-hybridized carbon atoms present in the fluorophore used in the experiments
Mandarinka [93]

Answer:

9

Explanation:

The structure of fluorophore used in the experiments has been drawn in the attachment. And from the drawing counting we can say that there are 9 sp2-hybridized carbon atoms present. Fiuorophores are a fluorescent chemical compound that can re-emit light upon light excitation. Normally used to produce absorbance and emission spectra.

3 0
2 years ago
Four students are developing a model to illustrate covalent and ionic substances dissolving in
Liono4ka [1.6K]

The students with ionic bonds have a better understanding of what the model needs to illustrate.

Explanation:

  • When ionic compounds dissolve in water, they break apart into the ions that make them up through a process called dissociation.
  • When placed in water, the ions are attracted to the water molecules, each of which carries a polar charge.
  • If the force between the ions and the water molecules is strong enough to break the bonds between the ions, the compound dissolves.
  • The ions dissociate and disperse in solution, each ringed by water molecules to prevent reattachment.
  • The ionic solution turns into an electrolyte, meaning it can conduct electricity.
  • While covalent compounds dissolve in water they break apart into molecules, but not individual atoms.
  • Water is a polar solvent, but covalent compounds are usually nonpolar.
  • This means covalent compounds typically don't dissolve in water, instead making a separate layer on the water's surface.
5 0
2 years ago
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