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3 years ago

Which part of the electromagnetic spectrum has a lower frequency than visible light?

Chemistry

2 answers:

drek231 [11]3 years ago

6 0

Answer: infrared

Explanation: They have a longer wave length than visible light.

Natali5045456 [20]3 years ago

5 0

Answer:

infrared

Explanation:

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1. An unknown amount of mercury (II) oxide was decomposed in the lab. Mercury metal was formed and 4.50 L of oxygen gas was rele

Musya8 [376]

Answer:

1. 59.1 g HgO

2. A.) 38.2 L

3. B.) It is directly proportional to the number of moles of the gas.

Step-by-step explanation:

1. Mass of HgO

We know we will need a chemical equation with masses and molar masses, so let's gather all the information in one place.

M_r: 216.59

2HgO ⟶ 2Hg + O₂

(a) Calculate the moles of O₂

pV = nRT Divide each side by RT

n = (pV)/(RT)

Data:

p = 0.970 atm

V = 4.50 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 390.0 K

Calculation:

n = (0.970 × 4.500)/(0.082 06 × 390.0)

n = 0.1364 mol O₂

(b) Calculate the moles of HgO

The molar ratio is 1 mol O₂/2 mol HgO.

Moles of HgO = 0.1364 mol O₂ × (2 mol Hg/1 mol O₂)

Moles of HgO = 0.2728 mol HgO

(c) Calculate the mass of HgO

Mass of HgO = 0.2728 mol HgO × (216.59 g HgO/1 mol HgO)

Mass of HgO = 59.1 g HgO

This isn't any of the options in your list. Have I made an error?

2. Volume of Hydrogen

Mg + 2HCl ⟶ MgCl₂ + H₂

n/mol: 3.00

(a) Calculate the moles of H₂

The molar ratio is (1 mol H₂/2 mol HCl).

Moles of H₂ = 3.00 mol HCl × (1 mol H₂/2 mol HCl)

Moles of H₂ = 1.50 mol HCl

(b) Calculate the volume of H₂

pV = nRT Divide both sides by p

V = (nRT)/p

Data:

n = 1.50 mol

T = 298 K

p = 0.960 atm

Calculation:

V = (1.5 × 0.082 06 × 298)/0.960

V = 38.2 L

3. Volume of gas

pV = nRT

V = nRT/p

If T and p are constant, (RT)/p = constant = k

V = kn

V ∝ n

The volume is directly proportional to the number of moles of the gas.

3 0

4 years ago

Yellow light has a frequency of 5.2 × 1014 Hz and travels at a speed of 3.0 × 108 m/s. What is the wavelength of yellow light, i

mina [271]

Answer:

5750 angstrong unit to 5850 angstrong unit

5 0

3 years ago

A sample of nitrogen gas has a volume of 237mL at 9.86atm. What is the new

MrRa [10]

Answer:

The new volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure." That is, if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

P * V = k

Assuming that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1*V1= P2*V2

In this case:

P1= 9.86 atm
V1= 237 mL
P2= 2.84 atm
V2=?

Replacing:

9.86 atm* 237 mL= 2.84 atm*V2

and solving you get:

$V2=\frac{9.86 atm* 237 mL}{2.84 atm}$

V2= 822.82 mL

The new volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.

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3 years ago

4. A food label is marked 4500 Calories. How many Calories is this? Justify your answer.

Nata [24]

Answer:

Explanation:

Xx cals

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3 years ago

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What happens to Kinetic? energy during gas particles collision

Vitek1552 [10]

Answer:

Gas particles are in a constant state of the random motion and move in straight lines until they collide with another body. The collisions exhibited by gas particles are completely elastic; when the two molecules collide, total kinetic energy is conserved.

Hope it helps!

6 0

3 years ago

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