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3 years ago

What is theWhat is the approximate tilt of the earth's axis? approximate tilt of the earth's axis?

Chemistry

1 answer:

Vedmedyk [2.9K]3 years ago

6 0

Earth's axis is tilted 23.5 degrees from the plane of its orbit around the sun.

But this tilt changes. During a cycle that averages about 40,000 years, the tilt of the axis varies between 22.1 and 24.5 degrees.

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An atom has the following electron configuration.

otez555 [7]

Explanation:

10 valence electron are there

8 0

3 years ago

Many oxidation-reduction reactions can be balanced by inspection. Try to balance the following reactions by inspection. In each

Phoenix [80]

Answer:

Balanced reaction: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

Reduced: O₂

Oxidized : C₃H₈

Explanation:

For the given reaction:

C₃H₈(g) + O₂(g) → CO₂(g) + H₂O(l)

In the reactants, there are 3 C, and in the products only one, so we multiply CO₂ by 3:

C₃H₈(g) + O₂(g) → 3CO₂(g) + H₂O(l)

In the reactants, there are 8 H, and in the products, there are 2 H, so we multiply H₂O by 4:

C₃H₈(g) + O₂(g) → 3CO₂(g) + 4H₂O(l)

In the reactants are 2 O, and in the products 10 O, so we multiply O₂ by 5:

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

The reaction is balanced.

Let's identify the oxidation number (Nox) of the elements in each compound.

C₃H₈:

H has fix Nox equal to +1, and the molecule is neutral, so, calling x the Nox of C:

3x + 8 = 0

3x = -8

x = -8/3

O₂:

Because is a pure compound, the Nox of O is 0.

CO₂:

The Nox of O is fix equal to -2, and the molecule is neutral, so, calling x the Nox of C:

2x -4 = 0

2x = 4

x = +2

H₂O:

The Nox of H and O are fixed, respectively, +1 and -2.

So, the carbon in C₃H₈ is oxidized because its Nox is increasing, and oxygen in O₂ is reduced because its Nox is decreasing.

6 0

3 years ago

A stock phenolphthalein solution was prepared by dissolving 0.050 g in a total volume of 100.0 ml. You place one drop (0.050 ml)

devlian [24]

Answer:

the value of molar absorptivity is 229000 $M^{-1} cm^{-1}$

Explanation:

given data

phenol phthalein solution = 0.050 g

total volume = 100.0 ml

dilute = 100.0 ml

diluted sample = 0.18

solution

we get here concentration that is express as

concentration = ( mass of solute × 1000 ) ÷ ( molar mass of solute × volume of solution ) .............1

put here value

concentration = $\frac{0.050\times 1000}{318.32\times 100}$

concentration = 0.00157 M

and here dillution equation is express as

c1 × v1 = c2 × v2 .................2

here c1 and c2 is initial and final concentration

and v1 and v2 is initial and final volume

put here value

0.001571 × 0.050 = c2 × 100

c2 = 7.855 × $10^{-7}$ M

and

now we get molar by absorbance equation that is

A = E × C × l ................3

here A is absorbance and E is molar and c is absorptivity and l is path length

put here value

0.18 = E × 7.855 × $10^{-7}$ × 1

E = 229000 $M^{-1} cm^{-1}$

3 0

3 years ago

How do stars contribute to the elements inside you? explain plzzz soon as possible before 11:30 !!!!!!!!!!!!

Natalka [10]

Answer:

yes took test

Explanation:

6 0

3 years ago

A barometer displaying a reading of 29.8 inches of mercury would be equivalent to ___________ millibars of atmospheric pressure

Elis [28]

1 atm = 760 mmHg
29.8 mmHg / 760 mmHg * 1atm = 0.039 atm

5 0

3 years ago