How much heat is required to raise the temperature of 93.5 gg of water from its melting point to its boiling point

Answer: No

Explanation: Some scientists have declared that mineral deposits containing important non renewable resources such as copper and zinc will be exhausted in a few decades if consumption does not decrease.

Answer:

- The two gases will mix and react.: FALSE.

- The two gases will remain separate and will not mix: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the -two bulbs will be 6.50 atm.: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm.: TRUE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE.

Explanation:

Hello.

In this case, given the options, since the total volume of the container includes the both of them, we find that:

- The two gases will mix and react: FALSE, since we do not know the identity of the gases which could be the same or two different inert gases.

- The two gases will remain separate and will not mix: FALSE, since as the valve is opened, the total gas will occupy the entire volume as the volume of a gas is the same to the container based on its constant molecules movements.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 6.50 atm: FALSE, since in this case, by using the Boyle's law for the first compartment we obtain the pressure of the gas there:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*2.00L}{5.00L} =0.8atm[/tex]

Now, we reuse it for the gas at the 3.00-L bulb to find its final pressure:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*3.00L}{5.00L} =2.7atm[/tex]

So the final pressure is:

[tex]P_{TOTAL}=0.8atm+2.7atm\\\\P_{TOTAL}=3.5atm[/tex]

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm: TRUE considering the total pressure computed above.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE since the final pressure is 3.5 atm.

Regards.

Answer:

It is a chemical change.

Explanation:

A tree burning down would be a chemical change because the composition of the tree is what changes, not just the physical characteristics.

Answer:

1. Gases have neither definite shape nor definite volume. They expand to the size of their container.

2. Gases are fluid, and flow easily.

3. Gases have low density, unless compressed. ...

4. Gases diffuse (mix and spread out) and effuse (travel through small holes).

Explanation:

Answer:

Diphosphorus Pentaoxide

Explanation:

We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.

2 is Di

5 is penta

Diphosphorus Pentaoxide

Answer:

C. Diphosphorus Pentaoxide

Explanation:

Answer:

frequency f = velocity of light (c)/wavelength

therefore, wavelength =

velocity of light /frequency

= 3 x 10^8/ 5.43 x 10^-12

= 0.552 x 10^20.

HOPE IT HELPS

Answer:

6.38

Explanation:

line up the decimals

it helps to add another 0 to 2.6 so that you can align them better

1

2.60

+ 3.78

= 6.38

8 + 0 = 8

6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60

2 + 3 + 1 = 6

I tried my best to show it through text.

Answer:

Mass = 89.97 g

Explanation:

Given data:

Number of moles of chloride ions = 1.98 mol

Mass in grams of MgCl₂ present = ?

Solution:

we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,

                  Cl₂          :        MgCl₂

                   2            :          1

                  1.89        :        1/2×1.89 = 0.945

Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.

Mass of MgCl₂:

Mass = number of moles × molar mass

Mass = 0.945 mol × 95.211 g/mol

Mass = 89.97 g

Answer:

~26 atoms of sulfur

Explanation:

When working problems involving equations I find it helpful to works through moles because it relates to the coefficients of balanced equation by linear ratio. In other words, convert data to moles, solve by ratio and convert results to desired dimensions. In this case Atoms of Sulfur.

Given: 52 atoms K = 52 atoms/6.02 x 10²³atoms K/mole K = 9.64 x 10⁻²³ mole K atoms.

Using ratios in given equation 4K + 2S => 2K₂S

Says

       4           moles K reacts with 2 moles Sulfur, then

 8.64 x 10⁻²³ mole K reacts with X moles Sulfur

Set up ratio:

(4 moles K) / (8.64 x 10⁻²³ moles K) = (2 moles S) / X

Solve for X => X = (2 moles S x 8.64 x 10⁻²³ mole K) /  4 mole K = 4.32 x 10⁻²³ mole S used

Converting moles S to atoms S, multiply by Avogadro's Number ...

Atoms S used = 4.32 x 10⁻²³ mole S used x 6.02 x 10²³ Atoms S / mole S

=> 26.0064 Atoms S  ≈ 26 Atoms Sulfur used.

Note: This is a reasonable answer in that the balanced equation given indicates that half the number moles S reacts with K. So, one can conclude that half the number of potassium atoms would indicate the number of sulfur atoms needed. test => ¹/₂(52) = 26 atoms S.

Answer:

The principal quantum number for the outermost electrons in a Cl atom in the ground state is 3.

Explanation:

By using the Pauling distribution the chlorine atom has an electronic set of [tex]3s1^{2}[/tex]

With n=3 for an orbital S, l = 0 , ml = 0 and ms = ± 1/2

Therefore the final answer is 3

Answer:

HC2H3O2 + NaOH = H2O + NaC2H3O2 - Chemical Equation Balancer.

Answer:

please check the image :)

Answer:

The structural formula of CH2CONHCH3 is attached below -:

and the functional group of CH2CONHCH3 is - Amide

Explanation:

The IUPAC name of CH2CONHCH3 is -: N-methyl ethenamide .

ABOUT AMIDE FUNCTIONAL GROUP -: In organic chemistry, an amide, also known as an organic amide or a carboxamide, is a compound with the general formula RC(= O) NR 'R' where R, R 'and R' represent hydrogen organic groups or atoms.  When it is part of the main protein chain, the amide group is referred to as a peptide bond and isopeptide bond when it appears in a side chain, such as asparagine and glutamine in the amino acids.

The structural formula shows the arrangement of atoms and groups in a compound.

A chemical compound is composed of atoms of elements. There are three structures that could be written for a chemical substance. These are;

The structural formula of a compound shows the arrangement of atoms and groups in the compound in space. The structural formula of the compound CH2CONHCH3 has been shown in the image attached. The following functional groups are present in the compound;

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Convert mole to gram by multiplying the molar mass of sodium

0.500mol Na x 22.990g = 11.495g of Na

Answer:

The correct answer is - option B. 4.

Explanation:

The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.

These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.

If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4

An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).

Generally, the electromagnetic spectrum comprises the following:

When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.

Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.

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Answer:

Explanation:

Given 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂

          27.4g

       =(27.4g/98g/mol)

       = 0.280 mole H₃PO₄ used

Ca Used:

Rxn Ratio H₃PO₄ : Ca => 2:3

∴ moles Ca used = 3/2(0.280) mole Ca =0.420 mole Ca

grams Ca used = 0.420 mole Ca x 40 g/mole = 16.8 grams Ca used

Grams H₂ Produced:

Rxn Ratio H₃PO₄ : H₂ => 2:3 => moles H₂ produced = 3/2(0.28 mole H₂) = 0.420 mole H₂ = (0.420 mole H₂ x 2.02 g/mole) = 0.8484 grams H₂(g) Produced.

Moles Ca₃(PO₄)₂ Produced:

FWt Ca₃(PO₄)₂ = 310 g/mole

Rxn Ratio H₃PO₄ : Ca₃(PO₄)₂  => 2:1

∴moles Ca₃(PO₄)₂ Produced = 1/2(moles H₃PO₄ used)

= 1/2(0.28 mole) = 0.14 mole Ca₃(PO₄)₂  

If you want grams Ca₃(PO₄)₂, multiply moles Ca₃(PO₄)₂ by formula weight.

Answer:

The new volume of gas is 25.7 L.

Explanation:

Given data:

Initial volume = 24.0 L

Initial pressure = 10.0 atm

Initial temperature = 200 K

Final temperature = 300 K

Final volume = ?

Final pressure = 14.0 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 10.0 atm × 24.0 L × 300K / 200 K × 14.0 atm

V₂ = 72000 atm .L. K / 2800 K.atm

V₂ = 25.7 L

The new volume of gas is 25.7 L.

Answer:

CCCCCCCCCCCCCCCCCCCC THATS THE ANSWER

Explanation:

Answer:

i think its f because my teacher have been talking about this

Explanation:

Answer:

f

Explanation:

Answer:

frequency

Explanation:

i just did it

Answer:

A: analog signal

Explanation:

on edge2021!

Answer:

MnO₂ is limiting reactant

7.68g is theoretical yield

73.6% is percent yield

Explanation:

The reaction of the question is:

3MnO₂ + 4Al → 2Al₂O₃ + 3Mn

To determine limiting reactant we need to convert each reactant to moles and, based on the chemical equation determine the moles you need of the other reactant for a complete reaction:

Moles MnO₂ -Molar mass: 86.937g/mol-:

9.81g * (1mol / 86.937g) = 0.113 moles

Moles Al -Molar mass: 26.98g/mol-:

6.54g * (1mol / 26.98g) = 0.242 moles

For a complete reaction of 0.242 moles of Aluminium you will require:

0.242mol Al * (3MnO₂ / 4Al) = 0.182 moles of MnO₂

As there are just 0.113moles of MnO₂, MnO₂ is limiting reactant

Now, with limiting reactant we need to determine theoretical moles and grams of Al₂O₃ produced:

Moles:

0.113 moles MnO₂ * (2Al₂O₃ / 3MnO₂) = 0.0753 moles Al₂O₃

Grams (Molar mass: 101.96g/mol):

0.0753 moles Al₂O₃ * (101.96g/mol) = 7.68g is theoretical yield

Percent yield is 100 times the ratio between actual yield (5.65g) and theoretical yield:

5.65g/7.68g * 100 =

Answer:

HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)

Explanation:

A weak acid as aspirin, HC₉H₇O₄, is in equilibrium with water as follows:

This is the chemical equation that describes the process.

As you can see, not all aspirin is dissolved, just a part that is converted in its conjugate base (A weak acid doesn't dissociate completely!).

Also, the pH is decreasing because the hydronium ion (H₃O⁺) is produced in the equilibrium (Remember, if you have an increasing in H₃O⁺ concentration the pH will decreases and vice versa).

Answer:

B. It undergoes phase change.

Explanation:

Answer:

Corresponding with orange light, is the wavelength that blue solutions absorb the most.

Explanation:

When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.

Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.

Rutherford's results declined the results of Thomson's model, the correct option is C.

Atomic Models are the scientific theories proposed to determine the structure of an atom.

There are mainly 5 theories proposed for atomic models.

1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.

2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.

3. Rutherford's model: proved the presence of a nucleus.

4.Niel Bohr's model: Arrangement of electrons in shells.

5. Erwin Schrodinger's model is also called as Quantum Model.

In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,

Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.

So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.

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The outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.

It is called a magnetic field to a space in which magnetic phenomena take place due to the influence of a body with properties of electric charges.

The earth's magnetic field is mainly produced by the electric currents that occur in the outer core, liquid in nature, which is composed of highly conductive cast iron.

As the center of the Earth cools, part of the iron contained in the fluid outer core solidifies and becomes part of the inner core.

The outer core changes its chemical composition and becomes less dense, generating convective currents.

This process, together with the Coriolis effect (product of the Earth's rotation) generates strong helical convection currents that align with the axis of rotation.

The Earth is mostly protected from the solar wind, a stream of energetic charged particles emanating from the Sun, by its magnetic field, which deflects most of the charged particles.

These particles would destroy the ozone layer, which protects the Earth from harmful ultraviolet rays.

Therefore, we can conclude that the outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.

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Answer:

SOLUTION A

Explanation:

Molarity is one of the most common measure of concentration

The correct option that gives the solution that has the same molar concentration as solution X is the option;

Solution A

Reason:

The descriptions of the content or each beaker are;

Content of beaker X = Eight spheres of four groups of two differently colored spheres

Content of beaker with solution A = Four spheres of a single color

Content of beaker with solution B = Eight spheres of a single color

Content of beaker with solution C = Eight spheres in two groups of four having three spheres of one color and one sphere of a different color

The concentration of a solution given by the molarity is defined as the    number of moles per liter of the solution

A mole is a quantity of matter that contains 6.023 × 10²² elementary particles

Considering each group of spheres as representing one mole of a substance, we have;

Therefore, the solution that has the same molar concentration, (the same number of moles per volume of the solution) is solution A

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