Answer:
The correct option is D.
Explanation:
Radioactive substances usually emit different types of particles when they are decaying. Such particles include alpha particles, beta particles and gamma ray. When an alpha particle is emitted from an unstable radioactive nucleus such nucleus usually lost an atomic mass that correspond to that of helium atom. Note that an alpha particle is made up of two protons and two neutrons, which result in mass number of 4. Thus, a nucleus that emit an alpha particle will have its mass number (atomic mass) reduce by 4 and atomic number that is reduced by 2.
(A) 
The De Broglie wavelength of an electron is given by
(1)
where
h is the Planck constant
p is the momentum of the electron
The electron in this problem has a speed of

and its mass is

So, its momentum is

And substituting into (1), we find its De Broglie wavelength

(B) 
In this case we have:
m = 0.143 kg is the mass of the ball
v = 40.0 m/s is the speed of the ball
So, the momentum of the ball is

And so, the De Broglie wavelength of the ball is given by

(C) 
The location of the first intensity minima is given by

where in this case we have

L = 1.091 is the distance between the detector and the slit
is the width of the slit
Solving the formula for
, we find the wavelength of the electrons in the beam:

(D) 
The momentum of one of these electrons can be found by re-arranging the formula of the De Broglie wavelength:

where here we have
is the wavelength
Substituting into the formula, we find

Answer:
Forward direction
Explanation:
The reaction quotient of an equilibrium reaction measures relative amounts of the products and the reactants present during the course of the reaction at particular point in the time.
Q < Kc , reaction will proceed in forward direction.
Q > Kc , reaction will proceed in backward direction.
Q = Kc , reaction at equilibrium.
It is the ratio of the concentration of the products and the reactants each raised to their stoichiometric coefficients. The concentration of the liquid and the gaseous species does not change and thus is not written in the expression.
Thus, for the reaction:
The expression is:
![Q=\frac {[CIO_3^{-}][Cl^{-}]^2}{[CIO^{-}]^3}](https://tex.z-dn.net/?f=Q%3D%5Cfrac%20%7B%5BCIO_3%5E%7B-%7D%5D%5BCl%5E%7B-%7D%5D%5E2%7D%7B%5BCIO%5E%7B-%7D%5D%5E3%7D)
Given,
[Cl⁻] = 0.50 mol/L; [ClO₃⁻] = 0.32 mol/L; [ClO⁻] = 0.24 mol/L
So,

Q = 5.7870
Since, Q < Kc (
)
The reaction will go in forward direction.
The grams of the sugar in 125 g of the drink is calculated as below
%M/m) = mass of the solute (sugar)/ mass of the solvent(drink) x100
let the mass of the solute(sugar) be represented by y
convert % into fraction by dividing by 100 = 10.5/100
10.5/100 = y/125
by cross multiplication
100y =1312.5
divide both side by 100
y=13.125 grams
The question is incomplete but the full question may be found in other sources.
This is the complete question:
- For the reaction 2Fe + 3Cl₂ → 2FeCl₃ which option is more accurate?
a. FeCl₃, reducing agent; Fe, oxidizing agent.
b. Cl₂, oxidising agent; Fe reducing agent.
c. Fe, reducing agent; FeCl₃, oxidizing agent.
d. FeCl₃, oxidizing agent, Cl₂, reducing agent.
Answer:
- <em><u>Option b. Cl₂, oxidising agent; Fe reducing agent.</u></em>
Explanation:
It is easy to recognize by simple inspection that the given reaction is a redox one (oxidation - reduction) because the substances in the reactant side are pure elements (whose oxidation state is always zero) and the substance in the product side is a compound formed by the two reactant elements (which means that now they have a different oxidation state).
In a redox reaction, <u>the element that increases its oxidation number</u> loses electrons and reduces other element, so this <u>is the reducing agent</u>. On the other hand, <u>the element whose oxidation number is decreased</u> has gained electrons, a so it <u>is the oxidizing agent</u> (it oxidizes other element).
I will show the oxidation states of each species in the chemical reaction, using superscripts:
- Fe⁰ + 3Cl₂⁰ → 2 Fe⁺³Cl₃⁻¹
Thus:
- 2 atoms of Fe increased their oxidation number from 0 to +3; meaning that they lost 6 electrons (3 electrons each), so Fe is the reducing agent (it reduced the Cl atoms).
- 6 atoms of Cl decreased their oxidation number from 0 to -1; meaning that they gained 6 electrons in total (1 elecron each), so Cl is the oxidizing agent (it oxidized the Fe atoms).