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sergiy2304 [10]
3 years ago
15

Ptolemy and Copernicus were astronomers who had proposed theories about the solar system. Ptolemy believed that the planets and

the sun orbited Earth. Copernicus believed that Earth and other planets circled a stationary sun. Which of these statements best explains why Ptolemy and Copernicus made different observations about the solar system?
They studied outdated theories and evidences.
They had different backgrounds and interests.
They used incorrect methods of experimentation.
They made errors in their scientific calculations.
Chemistry
1 answer:
riadik2000 [5.3K]3 years ago
3 0
I'm not 100% sure, however, Choice 1 seems the most plausible because the guys existed centuries ago, so most of the theories and evidence must be outdated. Again, NOT 100% sure! Good luck!
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Which of the following is not a conjugate acid-base pair?
-Dominant- [34]

Answer:

A. H3O+/OH−

Explanation:

A conjugate acid-base pair are a pair of molecules that differ in 1 H⁺

A. The conjugate pair of H₃O⁺ = H₂O not OH⁻

B. The conjugate pair of NH₄⁺ is NH₃

C. The conjugate pair of C₂H₃O₂⁻ is HC₂H₃O₂

D. The conjugate pair of H₂SO₃ is HSO₃⁻

That means right option, that is not a conjugate acid-base pair, is:

<h3>A. H3O+/OH− </h3>

5 0
3 years ago
According to the Law of Conservation of Mass, the total
dimulka [17.4K]

Answer:

Always equal to the total moles of the products.

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction equal to the mass of the reactants.

8 0
3 years ago
What is chemistry n laboratory​
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3 0
3 years ago
Calculate the standard cell potential (E∘) for the reaction X(s)+Y+(aq)→X+(aq)+Y(s) if K = 5.59×10−3.
Blizzard [7]

Answer:

E° = -0.133 V

Explanation:

In the reaction:

X(s) + Y⁺(aq) → X⁺(aq) + Y(s)

<em>1 electron is transferred from X to Y</em>

Now, using Nernst equation:

E° = RT / nF ln K

<em>Where R is gas constant (8.314 J/molK), T is absolute temperature (Usually 298.15K), n are transferred electrons (1, for the reaction), F is faraday constant (96485C/mol) and K is equilibrium constant (5.59x10⁻³)</em>

Replacing:

E° = 8.314 J/molK*298.15K / 96485C/mol*1 ln 5.59x10⁻³

<em>E° = -0.133 V</em>

5 0
3 years ago
PLZ HELP
rodikova [14]

Answer:

Observe: To model how hydrogen and oxygen react to make water, type “H2+O2” into the Reactants box and “H2O” into the Products box.

As the equation is written, which element is not in balanced?

oxygen isn't balanced...

Explanation:

in reactants there is 2hydrogens and 2 oxygen

but in product there is balanced no if hydrogen bt there is only one no of oxygen

4 0
3 years ago
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