Does the percentage of oxygen in the air decrease as altitude increases<br><br> PLZ HELP ASAP 20pts

30.) Use Percentages: According to the data in table above, what percentage of the energy used in the United States comes from f

STatiana [176]

Answer:

im no expert i believe 42

hope it helps

Explanation:

4 0

3 years ago

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Interpret the following equation for a chemical reaction using the coefficients given: H2(g) + Cl2(g) 2 HCl(g) On the particulat

jeyben [28]

Answer:

On the particulate level: 1 molecule of H₂(g) reacts with 1 molecule of Cl₂(g) to form 2 molecules of HCl(g).

On the molar level: 1 mole of H₂(g) reacts with 1 mole of Cl₂(g) to form 2 moles of HCl(g).

Explanation:

Let's consider the following equation.

H₂(g) + Cl₂(g) → 2 HCl(g)

We can use the balanced equation to interpret the changes in two levels: the particulate level and the molar level.

On the particulate level, we consider discrete molecules.

On the particulate level: 1 molecule of H₂(g) reacts with 1 molecule of Cl₂(g) to form 2 molecules of HCl(g).

On the molar level, we think in terms of moles, considering 1 mole of particles = 6.02 × 10²³ particles.

On the molar level: 1 mole of H₂(g) reacts with 1 mole of Cl₂(g) to form 2 moles of HCl(g).

7 0

4 years ago

Referring only to the periodic table, tell:

denpristay [2]

a) Both fluorine and chlorine are in the same group in periodic table.

b) They differ in their atomic radius and electronegativity.

c) Because they have the similar number of electrons in their outer shell.

Explanation:

a) Electronic configuration of chlorine and fluorine are similar because these two elements belong to the same group number 17 of the periodic table as they have the same number of electrons in their outer or valence shell. These are called as halogens and are highly reactant.

F - 1s2,2s2,2p5 (9)

Cl- 1s2,2s2,2p6,3s2,3p5 (17)

b. The atomic radius of chlorine and fluorine are different because fluorine is on top of chlorine in the group. We know as we go down in a group in the periodic table the atomic radius increases though they have the same number of electrons in their outer shell electronegativity decreases. Fluorine is the most electronegative element of the periodic table.

c) Iodine and bromine are also the members of group 17, although their atomic numbers are different they have same valence electrons as chlorine and fluorine.

Iodine electronic configuration: 1s2,2s2,2p6,3s2.........4d10,5s2,5p5.

Bromine electronic configuration: 1s2,2s2,2p6,3s2,........3d10,4s2,4p5

Chlorine electronic configuration: 1s2,2s2,2p6,3s2,3p5

We can observe the outer shell having same number of electrons.

8 0

3 years ago

The speed of the sound in air at room temperature is 343 m/s. Calculate this speed in miles per hour.

hjlf

Convert metres to feet:

343m*3.28f = 1,125.04ft/s

There are 3600 (60 seconds * 60 minutes) seconds in an hour. Therefore, use this number to convert to an hour.

1,125.04ft*3600s = 4,050,144 ft/h

Now, since you asked for miles, convert to miles (5280 ft in a mile):

4,050,144ft/5,280m = 767.072mph

That is your answer! Hope I helped. :)

6 0

3 years ago

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Both obsidian and pumice are formed from which of the following ?

Mashutka [201]

Answer:

option D= volcanoes

Explanation:

Obsidian:

It is igneous rock. It is made when molten rock material cool very rapidly in such a way that atoms could not arrange themselves and acquire amorphous form. It is also called mineraloid.

1. Mostly it is found in black color but it could be present in green or brown color.

2. In the form of glass obsidian are unstable and start to crystallize.

3. Obsidian are commonly found in New Zealand, Hungry, Russia, Canada, Italy, Argentine, Japan, Chile, Kenya, Peru and United States.

4. older obsidian can not be found because these glassy rocks destroyed very rapidly.

5. Obsidian are used in surgical tools for cutting.

6. obsidian are also used in jewelry.

Pumice:

pumice is volcanic rock. it is formed from the lava having high amount of gases and water content. the gas escape and frothy lava cool very rapidly and form very lighter rock material, called pumice.

1. it is lighter in color because of high content of silica.

2. its crushing material produce fine powder, called volcanic ash.

3. its density is very low that's way it floats on the surface of water.

4. it is used in the manufacturing of cement and also in pencil erasers.

5. it is found in Greece, Italy, Chile, Turkey, Russia , Tran, Syria ans United States.

6 0

3 years ago

Does the percentage of oxygen in the air decrease as altitude increases PLZ HELP ASAP 20pts