CHEMISTRY HIGH SCHOOL

If one ball with a momentum of 50 kg·m/s hits a ball at rest and no other forces are acting on either ball, what's the total momentum of both balls after the collision? A. 0 kg·m/s
B. 25 kg·m/s
C. 100 kg·m/s
D. 50 kg·m/s

Answers

Answer 1
Answer:

Answer:

The answer is (D) 50 kg·m/s   (PF Test)

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The internal energy of a gas decreases by 1.65 kJ when it transfers 1.87 kJ of energy in the form of heat to the surroundings.(a) Calculate the work done by the gas on the surroundings. (b) Does the volume of gas increase or decrease?
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The ____ contains the highest concentration of ozone.a. troposphere
c. stratosphere
b. mesosphere
d. exosphere

Answers

C. The stratosphere. About 90% of the ozone is in the stratosphere which begins about 8 miles above the Earth's surface.

Answer: Option (c) is the correct answer.

Explanation:

A layer above the troposphere and below the mesosphere is known as stratosphere.

This layer of stratosphere contains about 90% concentration of ozone and there is no occurrence of weather in this layer.

The occurrence of ozone in stratosphere makes it warmer.

Therefore, we can conclude that the stratosphere contains the highest concentration of ozone.

As the pressure on the surface of a liquid decreases, the temperature at which the liquid will boil(1) decreases
(2) increases
(3) remains the same

Answers

Answer: option (1) decreases.


Explanation:


May be you have experienced that: when you go to the beach, where the atmposhpere pressure is greater than the atmosphere pressure in places that are at higher altitudes, the water takes longer to boil. That is because the boiling temperature is greater, and you need more total heat (more time) to permit the liquid to reach that temperature.


The reason why that happens is because substances boil when the vapor pressure (the pressure of the particles of vapor over the liquid) equals the atmosphere pressure. So, when the atmposhere pressure increases, the temperature at which the vapor pressure reaches the atmosphere pressure also increases, and when the atmosphere pressure decreases, the temperature at which the vapor pressure reaches the atmosphere pressure decreases.
As the pressure on the surface of a liquid decreases, the temperature at which the liquid will boil(1) decrease.

The model below represents a nuclear reaction. Atom 1 is present before the reaction and Atom 2 and Atom 3 are produced after the reaction. Atom 1 = Atom 2 + Atom 3 + energy

The model most likely represents a reaction which
Select one:
a. takes place when atoms combine
b. takes place when atoms become inactive
c. does not produce energy in the sun
d. does not produce energy in nuclear power plants

Answers

Option C. Does not produce energy in the sun. Because energy in the sun is produced by fusion; this is the combination of two atoms, and that is the opposite to what the model shows.

Answer:

Correct answer is option C (does not produce energy in the sun )

Explanation:

Fusion:

When two light nuclei combined to form a heavy nucleus that time large amount of energy is emitted and this reaction is known as fusion reaction.

In sun energy is produced  due to fusion reaction but in this model atom1 is splitting in two light nuclei with emission of energy this type of reaction is known as fission reaction. This type of reaction is used to produce energy in nuclear power plant.So option D is not correct and it does not produce energy in the sun so option C is correct because this is fission reaction and in sun energy is produce due to fusion reaction.

Which sample is a homogeneous mixture?A) NaCI(s)
B) NaCl(aq)
C) NaCl(g)
D) NaCl(ℓ)

Answers

NaCl(aq) is a homogeneous mixture. Hence, option B is correct.

What is a mixture?

A mixture is a substance that is made up of two or more substances that are not chemically combined and in fixed proportions.  

Homogeneous mixtures are present with a similar uniform appearance and composition throughout. Examples are steel, air, salt water, etc.

Homogeneous mixtures may either be, a colloid or a solution.

An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.

Hence, option B is correct.

Learn more about mixture here:  

brainly.com/question/1446244

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NaCl(aq) is a homogeneous mixture.

An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.

Further Explanation

Mixture  

  • A mixture is a substance that is made up of two or more substances that are not chemically combined and in fixed proportions.  
  • A mixture may have several varying physical properties.
  • There are two types of mixture:

Homogeneous mixtures  

  • These are mixtures with a similar uniform appearance and composition throughout. Examples are, steel, air, salt water, etc.
  • Homogeneous mixtures may either be, a colloid or a solution.

Solutions  

  • Solutions are types of homogeneous mixtures containing two or more substances in a single phase.
  • Solutions contains, a solute which is the substance that dissolves in the other substance, and a solvent which is the substances that dissolves the solute.
  • For example, in a salt solution, water is the solvent and salt is the solute.

Colloid  

  • A colloid is a homogeneous solution that has an intermediate size particles between a suspension and a solution. Examples of colloids are fog and milk.  

Heterogeneous mixtures

  • This is a type of mixture that contain different substances or two or more phases of matter.
  • The components of heterogeneous mixtures are not uniform such that different samples of the mixture are not identical to each other.  
  • Examples of heterogeneous mixtures are; blood, soil, Gravel, etc.

Suspension  

  • It is a type of heterogeneous mixture made of larger particles that are visible and normally settles when the mixture is undisturbed.
  • Examples include, tomato juice, fine sand, etc.

Keywords: Mixtures, homogeneous mixture, Heterogeneous mixture

Learn more about:  

Level: High school  

Subject: Chemistry  

Topic: Mixtures and separation of mixtures  

Sub-topic: Types of mixtures  

I have to write a 150 word paragraph or two that describes at least three everyday things that exist or occur because of science. I also have to make sure i use examples. I don't have a clue where to start ??? PLEASE help!

Answers

You can do something like natural disasters and explain why they happen

A student is trying to classify an unidentified, solid gray material as a metal or a non metal. which question will best help the student classify the material?F. Is the material malleable or ductile?
G. Does the material feel hard to the touch?
H. Will the material float in water?
J. Does the material feel rough or smooth?

Answers

Answer:

i think the answer is f as metals are malleable and ductile

Answer:

F

Explanation: Most metals carry the trait that they are malleable and ductile.

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