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3 years ago

Which statements best describe wavelengths of sunlight that are longer than 700 nanometers

Chemistry

2 answers:

fredd [130]3 years ago

8 0

Answer:

These wavelengths are longer than wavelength of visible light.

These wavelengths form the infra-red part of the spectrum.

Explanation:

Solar spectrum has lies in three parts of the electromagnetic spectrum - Ultraviolet, visible and infra-red.

Visible light lies from 400 nm to 700 nm.

Ultraviolet region precedes visible spectrum and has shorter wavelength than it.

Beyond visible spectrum, infrared part of the spectrum starts and has longer wavelength than it.

The wavelength of sunlight that are greater than 700 nm wavelength have longer wavelength than visible light and lie in the infra-red part of the spectrum.

Oxana [17]3 years ago

5 0

Answer:

1. These wavelengths are longer than the wavelengths of visible light

2. These wavelengths form the infared part of the spectrum.

Explanation:

Just took the test uwu

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How much heat energy is required to raise the temperature of 50g of bromine from 25°C to 30°C? [Specific heat capacity of bromin

tia_tia [17]

Answer:

56.5J

Explanation:

To find the heat energy required use the formula for the specific heat capacity which is

c=quantity of heat/mass×change in temperature

in this question c is 0.226j/g,the mass is 50g and the change in temperature is 30-25=5

therefore

0.226=Q/50×5

Q=0.226×250

=56.5J

I hope this helps

6 0

2 years ago

an oxygen tank used for scuba diving has. avolume of 12.0 L .If the pressure of the tank is known to be 204.047 atm and the temp

Lapatulllka [165]

Answer: 101 moles of oxygen are contained in the tank

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 204.047 atm

V = Volume of gas = 12.0 L

n = number of moles = ?

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $22.0^0C=(22.0+273)K=295K$

$n=\frac{PV}{RT}$

$n=\frac{204.047atm\times 12.0L}{0.0821 L atm/K mol\times 295K}=101moles$

Thus 101 moles of oxygen are contained in the tank

5 0

2 years ago

In general, the value of the equilibrium constant for a chemical reaction does NOT depend on_________.

mart [117]

Answer: Option (B) is the correct answer.

Explanation:

Equilibrium constant is defined as the relationship present between the amounts of products and reactants which are there at equilibrium in a reversible chemical reaction at a given temperature.

For example, $A + B \rightleftharpoons C + D$

Mathematically, $K_{eq} = [C][D]$

As the value of equilibrium constant depends on rate constants of the forward and reverse reactions. And, this rate of reaction also changes with change in pressure and temperature.

Therefore, it will also lead to change in equilibrium constant but it does not depend on initial amount pf reactants.

Thus, we can conclude that in general, the value of the equilibrium constant for a chemical reaction does NOT depend on the initial amounts of reactants present.

4 0

2 years ago

B. Determine the percent composition of each element in NaCl. (1 point) Must show work to

andrey2020 [161]

Answer:

Sodium (Na): (.5 point)

22.99+35.453=58.433. 22.99/58.433= 39%

Chlorine (Cl): (.5 point)

22.99+35.453=58.433. 35.453/58.433= 61%

Explanation:

8 0

2 years ago

2. (2 pts) How would you prepare 1.5 liters of 2 M KCI (MW=74.55 g/mol)

ra1l [238]

Answer:

Dissolve 226 g of KCl in enough water to make 1.5 L of solution

Explanation:

1. Calculate the moles of KCl needed

$n = \text{1.5 L} \times \dfrac{\text{2 mol}}{\text{1 L}}= \text{3.0 mol}$

2. Calculate the mass of KCl

$m = \text{3.0 mol} \times \dfrac{\text{74.55 g}}{\text{1 mol}}= \text{224 g}$

3. Prepare the solution

Measure out 224 g of KCl.
Dissolve the KCl in a few hundred millilitres of distilled water.
Add enough water to make 1.5 L of solution. Mix thoroughly to get a uniform solution.

8 0

2 years ago