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2 years ago

What is wave frequency

Chemistry

1 answer:

olchik [2.2K]2 years ago

8 0

Explanation:

The frequency of a wave is the number of times per second that the wave cycles. Frequency is measured in Hertz or cycles per second. The frequency is often represented by the lower case "f." The period of the wave is the time between wave crest

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What is the layer in which radio waves bounce off ions and then return back to earth called

frez [133]

Ionosphere Hope that helps!

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3 years ago

Calcium has a cubic closest packed structure (fcc) as a solid. Assuming that calcium has an atomic radius of 197 pm, calculate t

Paha777 [63]

Answer:

$1.536 g/cm^3$ is the density of solid calcium.

Explanation:

Formula used :

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density

Z = number of atom in unit cell

M = atomic mass

$(N_{A})$ = Avogadro's number

a = edge length of unit cell

We have:

r = 197 pm = $197\times 10^{-12} m = 197\times 10^{-12}\times 100 cm$

$r=197\times 10^{-10} m$

$a=r\times 2\sqrt{2}$

$a=197\times 10^{-10} m\times 2\sqrt{2}=557.200\times 10^{-10} cm$

M = 40 g/mol

Z = 4

On substituting all the given values , we will get the value of 'a'.

$\rho =\frac{4\times 40 g/mol}{6.022\times 10^{23} mol^{-1}\times (557.200\times 10^{-10} cm)^{3}}$

$\rho =1.536 g/cm^3$

$1.536 g/cm^3$ is the density of solid calcium.

5 0

3 years ago

What is the name of the industry that produces solvents, lubricants, polymers and detergents?

fredd [130]

Answer:

the petrochemical industry

Explanation:

"Petrochemicals are the chemical products obtained from petroleum by refining. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as maize, palm fruit or sugar cane." - Textbook excerpt

4 0

3 years ago

At a particular temperature, K = 1.00×102 for the reaction: H2(g) + F2(g)= 2HF(g) In an experiment, at this temperature, 1.40 mo

horsena [70]

Answer:

0.20175 mol/L

Explanation:

The given equilibrium reaction and the equilibrium concentrations are shown below as:-

$\begin{matrix}&H_2&+&F_2&\rightleftharpoons &2HF\\ At\ time, t = 0 &1.40&&1.40&&0\\At\ time, t=t_{eq}&-x&&-x&&+2x\\ ----------------&-----&-&-----&-&-----\\Concentration\ at\ equilibrium:-&1.40-x&&1.40-x&&2x\end{matrix}$

The Kc of an equilibrium reaction measures relative amounts of the products and the reactants present during the 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.

The expression for the Kc is:-

$K_c=\frac{[HF]^2}{[H_2][F_2]}$

Given that:- Kc = $1.00\times 10^2$

Thus, applying the values as:-

$1.00\times 10^2=\frac{(2x)^2}{(1.40-x)(1.40-x)}$

$10^2=\frac{4x^2}{\left(1.4-x\right)^2}$

$100\left(1.4-x\right)^2=4x^2$

Solving, we get that:-

$x=1.17$

Thus,

$[H_2]_{eq}=1.40-x=1.40-1.17=0.23\ moles$

Given that:- Volume = 1.14 L

So, $Molarity=\frac{0.23}{1.14}\ mol/L=0.20175\ mol/L$

6 0

3 years ago

Think of the solids and liquids that you encounter every day. In what ways are solids and liquids similar? In what ways are they

alexandr1967 [171]

Answer:

Solids and liquids are both states of matter and have a definite volume. However, a solid has a definite shape and a liquid does not (can flow). In a liquid, the atoms are loosely bonded and far apart from each other (not as far as gases). Solids vibrate tightly together.

Explanation:

5 0

3 years ago

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