2 years ago

Why do the two elements silver an iron have different properties

1 answer:

5 0

Properties (especially chemical properties) of elements are usually determined by the valence shell electrons. Because silver and iron have a different number of valence shell electrons, their chemical properties are different.

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If an electromagnetic wave has a frequency of 4.5 x 10^18 Hz, what is its wavelength? The speed of light is 3 x 108 m/s.

Mekhanik [1.2K]

Answer:

Wavelength, λ = 6.7 x 10^-11 m

Explanation:

Frequency and wavelength are inversely proportional to each other.

In this problem;

f = 4.5 x 10^18 Hz

wavelength, λ = ?

Speed of light, c = 3 x 108 m/s.

These variables are related by the following equation;

c = λ * f

Making λ subject of focus, we have;

λ = c / f

λ = 3 x 10^8 / 4.5 x 10^18

λ = 0.67 x 10^-10

λ = 6.7 x 10^-11 m

3 0

3 years ago

Calculate the molarity of a solution of monoprotic KHP prepared by mixing a 0.5237 g KHP in 50.0 mL of water .

Sergio039 [100]

Answer:

$M=0.0513M$

Explanation:

Hello!

In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution, we notice we first need the moles of KHP as shown below:

$n=0.5237g*\frac{1mol}{204.22 g} =0.00256mol$