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3 years ago

Finally, it is time to return to Earth and review how scientists here classify organisms:

Chemistry

1 answer:

lilavasa [31]3 years ago

6 0

5. Eubacteria

6. Plantae

7. Animalia

8. Protist (technically not a kingdom)

9. Archaebacteria

10. Fungi

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Democritius thought that

andre [41]

Atoms because electrons, neutrons and protons are in a atom

6 0

3 years ago

Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm8 at 27 ∘C. (R =

maxonik [38]

Answer:

Total pressure = 56.77 bar

Explanation:

Given data:

Mass of dioxygen = 8 g

Mass of dihydrogen = 4 g

Volume of vessel = 1 dm³

Temperature = 27°C (27+273 = 300 K)

R = 0.083 bar.dm³ / mol.K

Total pressure = ?

Solution:

Number of moles of dioxygen:

Number of moles = mass/molar mass

Number of moles = 8 g/ 32 g/mol

Number of moles = 0.25 mol

Pressure of dioxygen:

PV = nRT

P = nRT/V

P = 0.25 mol × 0.083 bar.dm³ / mol.K × 300 K / 1 dm³

P = 6.97 bar.dm³ /1 dm³

P = 6.97 bar

Number of moles of dihydrogen:

Number of moles = mass/molar mass

Number of moles = 4 g/ 2 g/mol

Number of moles = 2 mol

Pressure of dihydrogen:

PV = nRT

P = nRT/V

P = 2 mol × 0.083 bar.dm³ / mol.K × 300 K / 1 dm³

P = 49.8 bar.dm³ /1 dm³

P = 49.8 bar

Total pressure of mixture in a vessel:

Total pressure = P (O₂) + P(H₂)

Total pressure = 6.97 bar + 49.8 bar

Total pressure = 56.77 bar

7 0

3 years ago

What 3 atoms make up the universe

jek_recluse [69]

Hydrogen, helium and oxygen

6 0

3 years ago

The following reaction occurs in a car’s catalytic converter.

blagie [28]

Answer:The correct answer is ;

The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.

Explanation:

$2NO(g)+2CO(g)\rightarrow N_2(g)+2CO_2(g)$

In an oxidation recation addition of oxygen atom takes place or loss of electrons takes place.

In an reduction reaction removal of oxygen atom takes place or gain of electrons takes place.

In the given reaction , the nitrogen atom is present in +2 oxidation state in NO molecule and present in 0 oxidation state in $N_2$ molecule. Hence, nitrogen is getting reduced that is reduction reaction. NO is oxidizing agent

In the given reaction , the carbon atom is present in +2 oxidation state in CO molecule and present in +4 oxidation state in $CO_2$ molecule. Hence ,carbon is getting oxidized that is oxidation reaction. CO is a reducing agent.

8 0

3 years ago

Read 2 more answers

use the gizmos to mix 200 G of copper at 100 C with 1000 g of water at 20 C whatis the final temperature

ziro4ka [17]

Answer:

Explanation:

mass of copper = 200 g at temperature 100°C

mass of water = 1000 g at 20⁰C

Let the final temperature be T .

specific heat of copper = .385 J per gram

specific heat of water = 4.182 J per gram

heat lost = mass x specific heat x fall of temperature

heat lost by copper

= 200 x .385 x ( 100 - T )

heat gained by water

= 1000 x 4.182 x ( T - 20 )

heat lost by copper = heat gained by water

200 x .385 x ( 100 - T ) = 1000 x 4.182 x ( T - 20 )

7700 - 77 T = 4182 T - 83640

4259 T = 91340

T = 21.44⁰C .

5 0

3 years ago