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2 years ago

What evidence did Copernicus use to explain that the sun is at the center of the solar system?

Chemistry

1 answer:

Ahat [919]2 years ago

4 0

Answer:

Copernicus's model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds. In a book called On the Revolutions of the Heavenly Bodies, Copernicus proposed that the Sun, not the Earth, was the center of the Solar System. Such a model is called a heliocentric system.

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What is the pH of a solution with a hydrogen concentration of 4.3 X 10^-12

oksano4ka [1.4K]

Answer:

pH = 11.37

Explanation:

To find the pH of a solution, we can use the formula:

pH = -log[H+]

Let's plug in what we know.

pH = -log(4.3 x $10^{-12}$ )

Evaluate the log.

pH = 11.37

Hope this helps!

6 0

3 years ago

An unknown solution has a ph of 8. how would you classify this solution?

Delvig [45]

I believe the correct answer from the choices listed above is option C. You would classify this solution as basic since it has the pH of more than 7 which signifies a basic solution. Hope this answers the question. Have a nice day. Feel free to ask more questions.

6 0

4 years ago

The decomposition of formic acid follows first-order kinetics. HCO2H(g) → CO2(g) + H2(g) The half-life for the reaction at 550°C

FromTheMoon [43]

Answer:

Option 4 is correct (72 seconds)

Explanation:

Option 4 is correct (72 seconds)

The formula we are going to use is:

$ln\frac{A}{A_o}=-kt$

Where:

A is the final concentration

A_o is the initial concentration

k is the constant

t is the time

Half-Life=0.693/k

Half-life in our case=24 seconds

k=0.693/24

k=0.028875 s^-1

Since the concentration is decreased by 87.5 % which means only 12.5%(100-87.5%) is left.

The ratio $A/A_o$ will become 0.125

$ln 0.125=-0.028875*t\\t=72.015\ seconds$

t≅ 72 seconds

5 0

3 years ago

Calculate the quantity of energy required to change 8.22 mol of liquid water to steam at 100oc. the molar heat of vaporization o

Ainat [17]

Since the water is at 100 degrees then it take 40.6 kj/mol to change 1 mole of water at 100 degrees into steam at 100 degrees
the moles of water 8.22mol
since one mole take 40.6kj/mol 8.22mol will be =
8.22mol x 40.6 kj/mol =333.732 kj

4 0

3 years ago

A solar powered car converts __________ energy into _____________ energy.

kotykmax [81]

Answer:

Explanation:

Solar power takes in light and turns it into a usable energy. if used in a vehicle that would take light energy and transform it into mechanical energy.

3 0

3 years ago

Read 2 more answers