Help ASAP 15 points

Rank these photons in terms of increasing energy:<br> (a) blue (λ=453nm)

alexira [117]

The increasing order of photons in terms of energy is Er < Ey < Eb

A photon is a tiny particle of electromagnetic radiation and its energy is proportional to the frequency and rest mass as zero.

By using the formula:

E = h * ν

E = h * c / λ

h = planks constant

c = speed of light

Since h * c is constant

E is inversely proportional to wavelength λ

For blue:

λ = 453 nm

Eb= k / 453

where k is constant

For red:

λ = 660 nm

Er = k / 660

For yellow:

λ = 595 nm

Ey = k / 595

Therefore,

The increasing order of photons in terms of energy is

Er < Ey < Eb.

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Complete question:

Rank the following photons in terms of increasing energy: (a) blue (λ = 453 nm); (b) red (λ = 660 nm); (c) yellow (λ = 595 nm).

8 0

2 years ago

Adding which of the following substances will decrease the solubility of calcium chloride in water: CaCl2(s) Ca2+(aq) + 2 Cl–(aq

Korvikt [17]

Answer:

Option b. Sodium chloride.

Explanation:

Consider the dissociation equilibrium of $\rm CaCl_2 \; (s)$ in water:

$\rm CaCl_2 \; (s) \rightleftharpoons Ca^{2+} \; (aq) + 2\; Cl^{-}\; (aq)$ .

By the Le Chatelier's Principle, increasing the concentration of either product will shift the equilibrium to the left. Some $\rm CaCl_2 \; (s)$ that was initially dissolved will precipitate out of the solution. This effect is called the common-ion effect.

For this $\rm CaCl_2 \; (s)$ solution, the products of dissociation are

$\rm Ca^{2+}$ ions, and
$\rm Cl^{-}$ ions.

Adding either to the solution will trigger the common-ion effect and reduce the solubility of $\rm CaCl_2 \; (s)$ .

In the two choices,

Sodium chloride $\rm NaCl$ will add $\rm Na^{+}$ and $\rm Cl^{-}$ ions to the solution.
Sodium fluoride $\rm NaF$ will add $\rm Na^{+}$ and $\rm F^{-}$ ions to the solution.

$\rm NaCl$ contains $\rm Cl^{-}$ ions. It is capable of triggering the common-ion effect. However $\rm NaF$ contains neither $\rm Ca^{2+}$ ions nor $\rm Cl^{-}$ ions. It will not trigger the common-ion effect.

6 0

3 years ago

what is the concentration of each of these solutions expressed as a percent sucrose by mass? a) 17g sucrose mixing in 183g water

storchak [24]

A) mass of solute = 17 g

mass of solvent = 183 g

% = mass of solute / total x 100

% = 17 / ( 17 + 183 ) x 100

% = ( 17 / 200 ) x 100

% = 0.085 x 100

= 8.5 %
________________________________

b) mass of solute = 30.0 g

mass of solvent =300.0 g

% = mass of solute / total x 100

% = 30.0 / ( 30.0 + 300.0 ) x 100

% = (30.0 / 330.0 ) x 100

% = 0.090 x 100

<span>= 9.0 %
</span>__________________________________________

hope this helps!

8 0

3 years ago

PLEASE HELP!<br> an element with 8 protons and 10 neutrons

leva [86]

Answer:

oxygen ion O2-

Explanation:

because it has 8 protons and gave gained 2 electron so O2-.

6 0

3 years ago

What is the electron structure of nitrogen?

Komok [63]

Answer:

(1s)^2 (2s)^2 (2p)^3

Explanation:

Nitrogen has 7 electrons. Hence, the structure will be,

=>(1s)^2 (2s)^2 (2p)^3

Hope it helps:)

5 0

3 years ago