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qwelly [4]
3 years ago
12

Which describes one way that Aristarchus's explanation of the movement of objects in the sky was different from other scientists

' earlier explanations? He discovered Venus’s phases. He argued that Earth rotates on its axis. He explained the concept of retrograde motion. He described the epicycles of the planets in the sky.
Chemistry
1 answer:
Natalija [7]3 years ago
4 0

Answer:

The correct option is;

He argued that Earth rotates on its axis

Explanation:

The hypothesis that the Sun is at the center of the universe and the Earth, the other planets and other heavenly bodies are revolving around the Sun was first proposed by Aristarchus of Samos who also believed that the motion of the stars where actually due to the rotation of the Earth about its axis

However, the propositions where rejected at the time because it was contrary to perception and senses such that a revolving Earth has to have a moving "great wind" in the air around us

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Explain how/why you categorized the substances the way you did. What characteristics of the substances helped you predict whethe
Rasek [7]

The presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

<h3>What determine acidic and basic nature of a solution?</h3>

The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.

While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

Learn more about substance here: brainly.com/question/2901507

6 0
2 years ago
In a quasi-static isobaric expansion, 700 J of work are done by the gas. If the gas pressure is 0.40 atm, what is the fractional
nordsb [41]

Answer : The fractional increase in the volume of the gas is, 1.78

Explanation :

Formula used to calculate the work done by the gas in quasi-static isobaric expansion is:

w=p\times dV

Isobaric means, at constant pressure.

w=p\times (V_f-V_i)

where,

w = work done by the gas = 700 J = 6.909 L.atm    (1 L.atm = 101.32 J)

p = pressure of the gas = 0.40 atm

V_f = final volume = ?

V_i = initial volume = 22.0 L

Now put all the given values in the above formula, we get:

w=p\times (V_f-V_i)

6.909L.atm=0.40atm\times (V_f-22.0)L

V_f=39.3L

Now we have to calculate the fractional increase in the volume of the gas.

Fractional increase in the volume of the gas = \frac{V_f}{V_i}

Fractional increase in the volume of the gas = \frac{39.3L}{22.0L}

Fractional increase in the volume of the gas = 1.78

Thus, the fractional increase in the volume of the gas is, 1.78

5 0
4 years ago
I just want to check to see if the answer my child has is right.​
Law Incorporation [45]

Answer:

2= Moles of SO₂ produced from 0.356 moles of PbS = 0.356 mol

3= Mass of hydrogen = 0.45 g

3= Mass of oxygen = 3.616  g

4 = Theoretical yield of P₂O₅ = 14.2 g.

Explanation:

Q2= Given data:

Moles of PbS = 0.356 mol

Moles of PbO = ?

Moles of SO₂ = ?

Solution:

Chemical equation:

2PbS + 3O₂  → 2PbO + 2SO₂

Now we will compare the moles of  PbS with PbO and SO₂ from balanced chemical equation.

                    PbS            :       PbO

                      2               :          2

                       0.356      :          0.356

Moles of PbO produced from 0.356 moles of PbS = 0.356 mol

                       

                  PbS               :       SO₂

                    2                  :         2

                    0.356          :         0.356

Moles of SO₂ produced from 0.356 moles of PbS = 0.356 mol

Q= 3

Given data:

Mass of water = 4.05 g

Mass of hydrogen = ?

Mass of oxygen = ?

Solution:

Chemical equation:

2H₂O   →   2H₂  + O₂

Number of moles of water:

Number of moles of water = mass/ molar mass

Number of moles of water = 4.05 g/ 18 g/mol

Number of moles of water = 0.225 mol

Now we compare the moles of water with hydrogen and oxygen.

                             H₂O            :              H₂

                               2              :                2

                             0.225        :              0.225

Mass of hydrogen:

Mass of hydrogen = moles × molar mass

Mass of hydrogen =  0.225 mol × 2g/mol

Mass of hydrogen = 0.45 g

                              H₂O            :              O₂

                               2              :                1

                             0.225        :              1/2×0.225 = 0.113 mol

Mass of oxygen:

Mass of oxygen = moles × molar mass

Mass of oxygen =  0.113 mol × 32g/mol

Mass of oxygen = 3.616  g

Q 4

Given data:

Mass of phosphorus = 3.07 g

Mass of oxygen = 6.09 g

Theoretical yield of P₂O₅ = ?

Chemical equation:

4P + 5O₂  → 2P₂O₅

Number of moles of phosphorus = mass/ molar mass

Number of moles of phosphorus = 3.07 g/ 31 g/mol

Number of moles of phosphorus = 0.1 mol

Number of moles of oxygen = mass/ molar mass

Number of moles of oxygen = 6.09 g/ 32 g/mol

Number of moles of oxygen = 0.2 mol

Now we will compare the moles of P₂O₅ with oxygen and phosphorus.

             O₂          :        P₂O₅

              5           :           2

             0.2         :          2/5 ×0.2 =  0.08 mol

              P           :        P₂O₅

             4            :           2

            0.1           :           2/4×0.1 = 0.05 mol

The number of moles of P₂O₅ produced from phosphorus are less that's why phosphorus will be limiting reactant.

Mass of P₂O₅ = moles × molar mass

Mass of P₂O₅ = 0.05 mol × 283.88 g/mol

Mass of P₂O₅ = 14.2 g

Theoretical yield of P₂O₅ = 14.2 g.

3 0
4 years ago
Functional groups create ____________ sites in molecules. The polar part of a molecule that can hydrogen bond to water is said b
zhenek [66]

Functional groups create reactive sites in molecules.

The polar part of a molecule that can hydrogen bond to water is said be hydrophilic.

Pi (π) bonds create active sites and will react with electron-deficient species.

A electronegative heteroatom like nitrogen, oxygen, or a halogen makes a carbon atom electrophilic.

(carbon will have less electronic density, which is attracted by the more electronegative heretoatoms, and it will tend to attract electron rich chemical species, and in this situation we say that the carbon atom is electrophilic).

The nonpolar part of a molecule that is not attracted to water is said to be hydrophobic.

A lone pair on a heteroatom makes it basic and nucleophilic.

(the heteroatom with the lone pair will tend to attract electron poor chemical species, and in this situation we say that the heteroatom is nucleophilic).

5 0
3 years ago
All of the following statements about electrons are true except?
Natalija [7]
A . Electrons are found in the nucleus of an atom

According to your information, it would be your answer,

Hope this helps!
4 0
4 years ago
Read 2 more answers
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