CHEMISTRY HIGH SCHOOL

An atom has an atomic number of 12 and a mass number of 25. How many neutrons does the atom have?12
13
25
37

Answers

Answer 1
Answer:

Answer:

The correct answer for the number of neutrons in this atom is: 13

Explanation:

Hello! Let's solve this!

The atomic number indicates the number of protons in the nucleus.

The mass number is the sum of protons and neutrons in the nucleus.

So, we have to make the difference between both numbers.

25-12 = 13

The correct answer for the number of neutrons in this atom is: 13
Answer 2
Answer: 25-12= 13. The mass number is the atomic number plus the no. of neutrons

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Given the system at equilibrium:2POCl3(g) + energy <==> 2PCl3(g) + O2(g)
Which changes occur when O2(g) is added tothis system?
(1) The equilibrium shifts to the right and the concentration of PCl3(g) increases.
(2) The equilibrium shifts to the right and the concentration of PCl3(g) decreases.
(3) The equilibrium shifts to the left and the concentration of PCl3(g) increases.
(4) The equilibrium shifts to the left and the concentration of PCl3(g) decreases.

Answers

Given the data from the question, the correct answer to the question is:

The equilibrium shifts to the left and the concentration of PCl₃(g) decreases. (Option 4)

What is chemical equilibrium?

This is simply defined as a state in a chemical system where there is no observable change in the properties of the system with time.

A French scientist postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states as follow:

  • If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

How to determine the position of equilibrium constant

Considering the question given above, we are concerned with O₂ (i.e concentration) being added to the reaction

2POCl₃(g) + energy <=> 2PCl₃(g) + O₂(g)

According to the principle given above, if more O₂ is added, then, PCl₃ and O₂ will react to produce more POCl₃. Thus, the equilibrium will shift to the left and also PCl₃ will reduce.

Learn more about chemical equilibrium:

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(4) The equilibrium shifts to the left and the concentration of PCl3(g) decreases.

The temperature at which a substance boils is an example of a physical property.a. True
b. False

Answers

A physicalproperty is any property that does not concern with the change of the substance.The changes in the physical property can be used to describe itstransformations or evolutions from its initial state. They are often referredto as observables. Temperature at which asubstance boils is an example of a physical property. The temperature at which a substance boils describes astate of a physical system. It describes the transformation of a liquid fromits liquid state to its vapor by increasing its temperature.


The answer would be (a.)True.

If there is 8 g of a substance before a physical change, how much will there be afterwards?

Answers

8 grams because physical changes dont involve a change in the substance's components, so the matter can not be destroyed, onlt changed.

Answer:

8 g

I took the quiz and because the amount doesn’t change

According to the kinetic molecular theory, whichstatement describes the particles in a sample of an
ideal gas?
A. The particles are constantly moving in circular
paths.
B. The particles collide, decreasing the total energy
of the system.
C. The particles have attractive forces between them
D. The particles are considered to have negligible
volume.

Answers

Answer:

D. The particles are considered to have negligible volume.

Explanation:

According to the Kinetic Molecular Theory for ideal gases

- Gases are composed of larges molecules which are in constant random motion in a straight line

- The volume of the gas particles is negligible compared to the total volume in which the gas is contained.

- The attractive and repulsive forces between gas molecules is insignificant ie There are no interactive forces.

- The collisions of the particles  are perfectly elastic and energy is being transferred between the particles but the total energy remaining constant

17. How many moles are there in a sample containing 1000 molecules of H2O?18. If you wanted a sample of H2O containing 6 x 23molecules, how could you measapproximate number without counting?

Answers

17) mol of H_(2)O = (no. of molecule)/(L)
                            = (1000 molecules)/(6.03 * 10^(23) molecules/mol )
                            = 1.658  *   10^(-21) mol

18) mol = (molecule)/(L)
      (Mass)/(Mr) = (Molecule)/(L)
      Let mass of oxygen = x
      (x)/((2 * 1) + (16)) = (6 * 10^(23) )/(6.03 * 10^(23) )
      x = (6 * 10^(23) ) (18 g/ mol)
             =  17.9 g

There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 andArgon-40. What would the atoms of these isotopes have in common? What would
be different about their atoms? (4 points)
HELP ASAP

Answers

On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

What characteristics do argon-36, argon-38, and argon-40 share?

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Why is potassium a 39 positioned before argon, atomic number 40, in the current periodic table?

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

To know more about periodic table visit:-

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