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3 years ago

How do plants and animals help to maintain a balance of carbon dioxide in the air?

1 answer:

5 0

The process of photosynthesis in plants releases oxygen into the atmosphere. Respiration by plants and animals, as they use the energy stored in food, and the process of decomposition of dead organisms, releases carbon dioxide into the atmosphere. All three work together to maintain the carbon dioxide-oxygen cycle.

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5.) During the electrolysis of dilute copper(II)sulphate solution using carbon 1 point

Neporo4naja [7]

Answer:

A g I need the answer too

Explanation:

6 0

3 years ago

A piece of iron (mass = 25.00 g) at 398.0 K is placed in a styrofoam coffee cup containing 25.00 mL of water at 298.0 K. Assumin

Cloud [144]

Answer:

The final temperature of the water is 36,93°C

Explanation:

When iron comes into contact with water, it gives it heat to increase its temperature. The heat that the iron yields to match the water temperature is.

Q = m . C . ΔT

Q = 25 g . 0,4990 J/g°C (298K - 398K)

Q = 25 g . 0,4990 J/g°C - 100°C = -1247,5 J

Kelvin or Celsius is the same, because ultimately the formula only takes the result of a subtraction

This is the heat (-1247,5 J) that water wins to increase its temperature. As in iron it is a detached heat, the result was negative, however, for water it is a gained heat, that's why it is positive.

1247,5 J = 25g . 4,180 J/g°C (Tfinal - 25°C)

For units, it's more confortable to work in Celsius.

1247,5 J / (25g . 4,180 J/g°C) = Tfinal - 25°C

11,93°C = Tfinal - 25°C

11,93°C + 25°C = Tfinal = 36,93 °C

It is reasonable that the water has increased its temperature because the iron temperature was 100 degrees higher, before both substances came into contact

5 0

3 years ago

There are eight primary amines with the molecular formula C5H13N.

emmainna [20.7K]

Answer:

1-Pentanamine

2-Pentanamine

3-Pentanamine

3-methyl-2-butanamine

3-methyl-1-butanamine

2-methyl-1-butanamine

2-methyl-2-butanamine

2,2-dimethyl-1-propanamine

2-pentanamine

3-methyl-2-butanamine

2-methyl-1-butanamine

Explanation:

Amines are organic compounds derived from ammonia by replacing the hydrogen atoms, one at a time with carbon-containing groups. The functional groups are R-NH₂, R₂-NH, and R₃-N

Amines are classified into primary, secondary, or tertiary according to the number of substituted hydrogen.

From the given question.

A compound with the molecular formula C₅H₁₃N was given;

The possible eight structural formula of the compound and those that exhibit chirality can be seen in the attached image below.

7 0

4 years ago

Consider the following unbalanced redox reactions. In each case, separate the whole reactions into half-reactions, balance the h

Marina86 [1]

Answer & Explanation:

(a)

$Fe^{2+} +NO_{3}^{-} => Fe{(OH)}_3 + N_2$

reducing agent = Fe²⁺

Oxidizing agent = NO₃⁻

oxidation

Fe²⁺ ⇒ Fe(OH)₃

reduction

NO₃⁻ ⇒ N₂

Oxidation Half Reaction

(redox reactions are balanced by adding appropriate H⁺ and H₂O atoms)

Fe²⁺ ⇒ Fe(OH)₃

Balance O atoms

Fe²⁺ + 3H₂O ⇒ Fe(OH)₃

Balance H atoms

Fe² + 3H₂0 ⇒ Fe(OH)₃ + 3H⁺

balance Charge

Fe² + 3H₂0 ⇒ Fe(OH)₃ + 3H⁺ + e⁻..............(1)

reduction Half Reaction

NO₃⁻ ⇒ N₂

Balance N atoms

2NO₃⁻ ⇒N₂

Balance O atoms by adding appropriate H₂O

2NO₃⁻ ⇒ N₂ + 6H₂O

Balance H atoms

2NO₃⁻ + 12H⁺ ⇒ N₂ + 6H₂O

Balance Charge

2NO₃⁻ + 12H⁺ + 10e⁻⇒ N₂ + 6H₂O.................(2)

Combine Equation (1) and (2)

(1) × 10: 10Fe² + 30H₂0 ⇒ 10Fe(OH)₃ + 30H⁺ + 10e⁻

(2) × 1: 2NO₃⁻ + 12H⁺ + 10e⁻⇒ N₂ + 6H₂O

(1) + (2): 10Fe² + 30H₂0 + 2NO₃⁻ + 12H⁺ + 10e⁻ ⇒10Fe(OH)₃ + 30H⁺ + 10e⁻ +

N₂ + 6H₂O

10Fe² + 24H₂0 + 2NO₃⁻ ⇒ 10Fe(OH)₃ + 18H⁺ + N₂

this is the balanced reaction

REDUCTION POTENTIAL

10Fe²⁺(aq) + 10e⁻ ⇒ 10Fe(OH)₃(aq) E°ox = 10(-0.44) = -4.4V

2NO₃⁻(aq) - 2e⁻ ⇌ N₂(g) + 18H⁺ E°red = 2(+0.80) = +1.6

10Fe² + 24H₂0 + 2NO₃⁻ ⇒ 10Fe(OH)₃ + 18H⁺ + N₂ E°cell = -2.8V

E°cell = E°red + E°ox

4 0

4 years ago

What is an isotope?

gizmo_the_mogwai [7]

An isotope of an element is another element that has the same number of protons but a different number of neutrons (for instance $^4_2He$ and $^3_2He$ )

6 0

3 years ago

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