Which idea was supported by Aristarchus, Copernicus, and Galileo?

The planets have epicycles.
The planets revolve around the Sun.
The stars rotate around the Sun.
The center of the solar system is Earth.

Answer:

18.066  × 10²³ atoms

Explanation:

Given data:

Number of atoms of Mg = ?

Number of moles of Mg = 3 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

3 mol   ×  6.022 × 10²³ atoms  / 1mol

18.066  × 10²³ atoms

Answer: skeletal equation : [tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)[/tex]

The products are sodium nitrate and barium sulphate.

balanced equation :  [tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

The skeletal equation is:

[tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)[/tex]

The balanced chemical equation is:

[tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)[/tex]

Answer:

0.50

Explanation:

A 0.72-mol sample of PCl₅ is put into a 1.00-L vessel and heated. At equilibrium, the vessel contains 0.40 mol of PCl₃(g) and 0.40 mol of Cl₂(g). Calculate the value of the equilibrium constant for the decomposition of PCl₅ to PCl₃ and Cl₂ at this temperature.

Step 1: Calculate the molar concentrations

[PCl₅]i = 0.72 mol/1.00 L = 0.72 M

[PCl₃]eq = 0.40 mol/1.00 L = 0.40 M

[Cl₂]eq = 0.40 mol/1.00 L = 0.40 M

Step 2: Make an ICE chart

        PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

I        0.72           0            0

C         -x            +x          +x

E      0.72-x          x           x

Step 3: Determine the value of x

Since [PCl₃]eq = [Cl₂]eq = 0.40 M, x = 0.40 M

Step 4: Determine the concentration of PCl₅ at equilibrium

[PCl₅]eq = 0.72-x = 0.72-0.40 = 0.32 M

Step 5: Calculate the equilibrium constant

Kc = [PCl₃] × [Cl₂] / [PCl₅]

Kc = 0.40 × 0.40 / 0.32 = 0.50

Answer:

Independent variable

Explanation:

Answer:

Exfoliation involves the removal of the oldest dead skin cells on the skin's outermost surface. Exfoliation is involved in all facials, during microdermabrasion or chemical peels. Exfoliation can be achieved by mechanical or chemical means.

Explanation:

I did copy off internet!

:P

Answer:

a. polar solutes dissolve in polar solvents.

Explanation:

Polarity is a phenomenon that has to do with the positive and negative electric (ionic) charges of a molecule. A molecule with distinct positive and electric charge is said to be POLAR. However, water is said to be a universal solvent because it dissolves more substances than any other solvent can.

This solvent property of water is a function of its POLARITY. Polar solutes dissolve in polar solvents. Hence, only polar solutes can dissolve in water (a polar solvent). Hence, in this case, CH3OCH3 (ether) will dissolve in water because it is a POLAR molecule/solute.

Answer:

See explanation below

Explanation:

This question is incomplete because you are not putting the compounds you are talking here. However, I manage to find this question, and the first image below is the whole question.

Now, According to this question, we have the same compound. The difference between them is that compound 1 has the CO2H in axial direction, while compound 2 has it in equatorial direction.

As they are both, you can easily say that compound 1 is more acidic because the formed anion of CO2H, which is the CO2- is stabilized by hidrogen bonding that is formed between the OH and the CO2H. As you can see, in compound 1 they are both pointing at the same direction so an hydrogen bonding is easily formed, and this gives more stability to thw whole compound, thus, a better acid.

On the contrary, compound 2 has the CO2H in a not so suitable orientation, so the possible hydrogen bonding there cannot be formed, so the anion cannot be stabilized by this force, thus, is less acidic than compound 1.

Hope this helps

Answer:

true

Explanation:

Solid, liquid and gases are the only three States of matter

Answer:

density= 2.7 g/cm3

volume= 25 cm3

mass = density× volume

= 35×2.7

= 94.5 g

Answer:

[tex]E=1.48x10^4J[/tex]

Explanation:

Hello!

In this case, since the energy implied in a heating process is computed by using the following equation:

[tex]E=mC(T_f-T_i)[/tex]

Whereas m is the mass, C the specific heat and T the temperature. In such a way, by plugging in the given mass, specific heat and temperatures, we obtain the following energy:

[tex]E=187.0g*4.703\frac{J}{g\°C} (52.9\°C-36.1\°C)\\\\E=1.48x10^4J[/tex]

Considering that the specific heat can by used by unit of °C or K because their difference is equivalent.

Regards!

Explanation:

2 C(s) + 3 H2(g) = C2H6(g)

Answer:

See explanation.

Explanation:

Hello!

In this case, considering the concept of phase change, we understand that it is related how the phases of matter, solid, liquid and gas, are related to each other for a specific substance.

For instance, when going over water, we notice that its most common phase at this atmospheric conditions is the liquid phase; however, if it starts losing energy (being cooled down) its molecules tend to get together and freeze, undergoing a phase change to solid. On the other hand, if heated up, its molecules will be able to get farther to each other and therefore undergo a phase change to gas.

Thus, we can realize that a phase change is also explained molecularly; because when a substance undergo a phase change, its molecules rearrange, according to the addition or removal of energy and therefore get to another phase.

Best regards!

Answer: which*

Explanation:

Answer:

metals and non metals respectively.

Answer:

Plant cells are the basic unit of life in organisms of the kingdom Plantae. They are eukaryotic cells, which have a true nucleus along with specialized structures called organelles that carry out different functions. ... They also have a cell wall that provides structural support.

Answer:

A campfire is an example of entropy. The solid wood burns and becomes ash, smoke and gases, all of which spread energy outwards more easily than the solid fuel. Ice melting, salt or sugar dissolving, making popcorn and boiling water for tea are processes with increasing entropy in your kitchen.

Explanation:

If this helped you, the please mark me the brainliest.

Answer:

htoybuuo

t857 NJ n8

u. t i ukuo. jl

Answer:

True. the density of water is 1.0 mg

Answer:

D. The heat speeds up a physical change, causing the liquid to turn into a gas.

Explanation:

Answer:

Place the experiments on a scale

Explanation:

If you place two of the same experiments on a scale, and cover one with a cup, the one with the cup will "lose" mass, while the other won't, due to the cup being a "containment field" I guess you could call it.

Answer:

The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties. The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle.

Answer:

A. Energy is transferred to different forms .

Explanation:

Hello!

In this case, we need to consider the law of conservation of mass and energy which states that mass and energy cannot be neither created nor destroyed, just modified; it means we can rule out B. and C. so far.

Moreover, since D. is actually true for combustion reactions because they are used to provide energy in industrial operations, this is not the concern here because a combustion reaction is not considered.

Therefore the correct option is A. Energy is transferred to different forms as the energy provided by Rose is transferred to the pendulum system .

Best regards!

Answer:

Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

Explanation:

Answer: Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

Explanation:

Answer:

[tex]\% Be=36\%\\\\\% O=64\%[/tex]

Explanation:

Hello!

In this case, since the percent compositions of Be and O in beryllium oxide are computed as shown below:

[tex]\% Be=\frac{m_{Be}}{M_{BeO}} *100\%\\\\\% O=\frac{m_{O}}{M_{BeO}} *100\%[/tex]

Since atomic masses are respectively 9.01 and 16.0 g/mol and the molar mass of the compound is 25.01 g/mol, the resulting percent compositions are:

[tex]\% Be=\frac{9.01}{25.01} *100\%=36\%\\\\\% O=\frac{16.0}{25.01} *100\%=64\%[/tex]

Best regards!

Answer:

D. It is limited to situations that involve aqueous solutions or specific compounds.

Explanation:

An Arrhenius acid is a substance that increases the concentration of H3O or H+ when dissolved in water. An Arrhenius base is a substance that increases the concentration of OH- when dissolved in water. These definitions tell us that D is indeed limited to situations that involve aqueous solutions or specific compounds, as aqueous means something that's dissolved in water.

A is wrong because the Bronsted-Lowry interpretation has a wider range of applications. Bronsted-Lowry acids and bases don't even need to be aqueous, so it is not limited to just aqueous solutions. They include any substance that can donate or accept a H+.

B is wrong because A is wrong. A and B basically say the same thing, that the Arrhenius interpretation has a wider range of applications than the Bronsted-Lowry interpretation.

C is wrong because the definition of an Arrhenius base is any substance that increases the concentration of OH-, or hydroxide ions. C completely counters this statement.

Here's photo for proof incase you're doubtful of my answer & explanation. Please click the heart if it helped.

Answer:

Which statement describes the Arrhenius interpretation of acids and bases?

❌ A) It has a wider range of applications than the Bronsted-Lowry interpretation.

❌ B) It has a wider range of applications than the Lewis and Bronsted-Lowry interpretations.

❌ C) It is used in situations that involve bases that do not produce hydroxide ions.

I Took Question Test And Have Nice Day.

Answer:

a marble about to reach the bottom of the slope

Explanation:

hope this helps

Answer:

C

Explanation:

If there is no heat to transfer from one bottle to the other, then both bottles are at an equilibrium. This just means that they're both on the same thermal energy level.

Answer:

75.4 g.

Explanation:

Hello there!

In this case, since the solubility stands for the maximum amount of a solute that is completely dissolved in a specific amount of solvent, typically 100 g of water as the universal solvent; we need to take into account that the higher the temperature the higher the solubility for the most of the solids.

In such a way, since the solubility of potassium bromide at 20 °C is 65.3 g per 100 g of water, at 40 °C is 75.4 g per 100 g of water, proving the aforesaid. Therefore, 75.4 g of potassium bromide will form a saturated solution with 100 g of water at 40 °C.

Regards!