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3 years ago

. What percentage of the electricity in the United States is generated directly from solar energy?

Chemistry

1 answer:

Natalija [7]3 years ago

5 0

Answer:

Solar energy provided about 2% of total U.S. electricity in 2018. Photovoltaic (PV) and solar-thermal power are the two main types of solar electricity generation technologies. PV conversion produces electricity directly from sunlight in a photovoltaic cell.

Explanation:

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An instrument that is used to measure air pressure is a ?

Zolol [24]

A barometer measures atmospheric pressure.

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3 years ago

What is the mass of 18.0 mL of honey if its' density is 1.42 g/mL?

BigorU [14]

mass (m) = ? , volume = 18.0 ml , density = 1.42 g/ml .

$density = \frac{mass}{volume} \\ \\ d = \frac{m}{v} \\ \\ mass = density \times volume \\ \\ m = d \times v \\ \\ m = 18 \: ml \times \: 1.42 \: \frac{g}{ml} \\ \\ m = 25.56 \: g$

I hope I helped you^_^

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2 years ago

Which of the following terms refers to the number of moles of solute per liter of solution?

Anika [276]

Molarity
Molarity is a unit used to express the concentration of a substance, and it is defined as the number of moles of solute per decimeter cubed (liter) of solvent.

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3 years ago

Calculate the amount of heat needed to convert 50.0 g of liquid water at to steam at 100ºC.

Kipish [7]

Answer:

We need 113000 J of heat (option 2 is correct)

Explanation:

Step 1: Data given

Mass of liquid water = 50.0 grams

ΔHVap = 2260 J/g

Temperature = 100 °C

ΔHVap = The amount of heat released to change phase of a liquid water to steam = 2260 J/g

Step 2: Calculate the heat needed

Q =m* ΔHVap

⇒with Q = the amount of heat needed = TO BE DETERMINED

⇒with m = the mass of water = 50.0 grams

⇒with ΔHVap = 2260 J/g

Q = 50.0 grams * 2260 J

Q = 113000 J

We need 113000 J of heat (option 2 is correct)

6 0

3 years ago

Photon energy is proportional to which of the following quantities? speed of light in a vacuum frequency of the light emitting t

charle [14.2K]

Answer:

The energy of the photon is directly proportional to the frequency of the light emitting the photon.

Explanation:

Energy of the photon is given by expression:

$E=h\times \nu=\frac{hc}{\lambda }$

E = Energy associated with the photon

$\nu$ = frequency of the light

h = Planck's constant = $6.626\times 10^{-34} J s$

c = speed of the light in vacuum = constant

$\lambda$ =Wavelength of the photon

$E\propto \nu$

The energy of the photon is directly proportional to the frequency of the light emitting the photon.

5 0

3 years ago