How many grams are in 4.2 × 10²² atoms of iron?​

The sections of the heating curve illustrate this process Section A followed by B. Therefore, option D is correct.

The term heating curve is defined as the graphical representation of the correlation between heat input and the temperature of a substance.

At section, A solid Ice at temperature 0°C can heat  for about 10 mins and all the energy generated from heating up the ice is used to split the bonds which binds the ice together as a solid.

At Section, B the liquid water at 100°C covert to vapor because the heat energy required here split the bond between the water molecules then they are move in random directions as vapor.

Thus, option D is correct.

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Your question is incomplete, probably your question was

As a sample of water is heated, the energy is used to overcome the attractions between the molecules so that they are no longer held close together and can move in random directions. Then, the kinetic energy of its molecules increases. Which sections of the heating curve illustrate this process?

As a sample of water is heated, the energy is - 1

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Answer:

The terms azeotropic and zeotropic are opposite to each other. The key difference between azeotropic and zeotropic mixture is that the dew point and bubble point of an azeotropic mixture intersect, whereas the dew point and bubble point of a zeotropic mixture are distinguishable.

Explanation:

Answer:

D

Explanation:

The energy of the reactants is higher than the  energy of the products.

Answer:

A chemical reaction

Explanation:

You're doing acid-alkali. Acid is like a ph.

Titration is a method used to prepare salts if the reactants are soluble. Concentration and volumes of reactants can be calculated from titrations. The concentration of an acid or alkali can be calculated by carrying out an experiment called a titration.

We have that for the Question "Today we are going to perform a titration. What is an acid-alkali titration?" it can be said that

From the question we are told

Today we are going to perform a titration. What is an acid-alkali titration?

a) A measurement apparatus

b) An analytic method

c) A chemical reaction

Generally  

acid-alkali titration is a popular chemical reaction that is used to obtain salts and this method is also used to determine many other variables of the reactants

Therefore

An acid-alkali titration is a

chemical reaction

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Answer: Molecular formula is S2F4

Explanation:   Assume mass of sample is 100 g.

Then mass of S is 45.77 g and amount of substance is

n = m/M = 45.77 g / 32.07 g/mol = 1.427 mol

MAss of F is 54.23 g and n = 54.23 g / 19 g/mol = 2.854

n(S( : n(F) = 1.427  : 2.854  | : 1.427   gives proportion

n(S) : n(F) = 1:2 , empirical formula is also (SF2)x

Now M(SF2) = 32.07 + 2·19 = 70.07 g/mol

x = 140.12 / 70.07 = 2  

Answer:

Yes they are

Explanation:

Answer:

Fossils are traces of ancient life. Scientists use fossils to gather information about the lives and evolutionary relationships of organisms, for understanding geological change.

No, not all antigens are foreign substances.

An antigen is any substance that can trigger an immune response, including the production of antibodies. Some antigens are naturally present in the body and are called "self" antigens which are usually not harmful, but in some cases, the immune system can mistakenly recognize them as foreign and attack them which can lead to autoimmune diseases.

Antigens bind together with antibodies and promote the elimination of harmful pathogens present in the body. They alert other parts of the immune system to take over which helps to neutralize the threat from pathogens.

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Answer: The Equator because it divides the Earth into the Northern and Southern hemispheres.

Explanation:

Explanation:

38.44 g CO2 = 0.873 mol CO2

0.873 mol CO2 × (1 mol C6H12O6 / 6 mol CO2)

= 0.146 mol C6H12O6 x (180.56 g C6H12O6/ 1 mol C6H12O6)

= 26.303 gm

Answer:

First solution pH = 1.32

Second solution pH = 9.44

Explanation:

For the first solution:

Which is the same as saying 4.78 x 10⁻² M is [H⁺].

Knowing [H⁺], we can now calculate the pH:

As for the second solution, we can calculate the pH by keeping in mind the relationship between pOH and pH:

Answer:

acid base

Explanation:

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Answer:

potassium carbonate -> potassium oxide + carbon dioxide

Explanation:

remember to look at your periodic table, located each element so in this case you would locate k,c and o which are potassium, carbon and oxygen. From there you use nomenclature rules to get your answer.

Answer:

Your answer would be a buffer, they control pH levels.

Explanation:

Buffer is a substance that reacts with an acid or a base to control pH. Hence, option A is correct.

pH is a measure of how acidic/basic water is.

Buffers are solutions that resist a change in pH after adding an acid or a base. Buffers contain a weak acid (HA) and its conjugate weak base (A−).

Hence, option A is correct.

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Answer:

Possible reasons why EA, or electronegativity, is a positive quantity for oxygen atom include:

Explanation:

Answer:

0.355 moldm^-3

Explanation:

Answer:

109.02 grams

Explanation:

Multiply the molar mass of sulfur by the moles: 3.4 * 32.065 = 109.02 grams

Given :

Molarity of sulfuric acid solution is 3.0 M.

Amount of sulfuric acid present in solution is 9.809 g.

To Find :

The volume of solution.

Solution :

We know, molarity is given by :

[tex]Molarity = \dfrac{number \ of \ moles \times 1000}{Volume\ ( ml )}\\\\M = \dfrac{w \times 1000}{M.M \times V}\\\\3 = \dfrac{9.809\times 1000}{98.09 \times V}\\\\V = \dfrac{1000}{10\times 3}\ ml\\\\V = 33.33 \ ml[/tex]

Therefore, volume required is 33.33 ml .

Answer:

liquid

Explanation:

Adjusting pH in Water

Pure or distilled water has a pH level of 7, which means it is neutral. If you want to increase the pH of water, you must add an alkaline substance, such as baking powder, to it. If you want to decrease the pH of water, you add an acidic substance, such as lemon juice, to it

A buffer can be added to a solution to control the pH. The correct option is c.

PH is potential hydrogen. It is the value of how acidic or alkaline, the solution is.

The pH scale is consisting of 1 to 14 measure numbers, a pH less than 7 is acidic and a pH more than 7 is basic.

A buffer is a solution that maintains the pH of any solution.

Thus, the correct option is C, a buffer.

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Answer:

Explanation:

Given pinene has a (temperature, vapor pressure) relation (K, torr) = {(373, 135), (429, 760)}, you want the heat of vaporization in kJ/mol and the vapor pressure at room temperature (23 °C).

The Clausius–Clapeyron equation can be used to find the heat of vaporization:

  [tex]\ln{P}=-\dfrac{\Delta H_{\text{vap}}}{R}\left(\dfrac{1}{T}\right)+C[/tex]

Solving for ∆H, we find ...

  [tex]\Delta H_{\text{vap}}=-\dfrac{R\cdot\ln{\dfrac{P_1}{P_2}}}{\dfrac{1}{T_1}-\dfrac{1}{T_2}}\\\\\\\Delta H_{\text{vap}}=-\dfrac{8.314\cdot\ln{\dfrac{760}{135}}}{\dfrac{1}{429}-\dfrac{1}{373}}\approx 41052.8[/tex]

The heat of vaporization of pinene is about 41 kJ/mol.

Rearranging the above equation to give P1, we have ...

  [tex]\ln{\dfrac{P_1}{P_2}}=-\dfrac{\Delta H_\text{vap}}{R}\left(\dfrac{1}{T_1}-\dfrac{1}{T_2}\right) \\\\\\P_1=P_2\cdot e^{-\frac{\Delta H_\text{vap}}{R}\left(T_1^{-1}-T_2^{-1})}[/tex]

Using the same P2 and T2 as above, we find the vapor pressure at room temperature (296.15 K) to be ...

  P1 ≈ 4.349 . . . . . torr

The vapor pressure of pinene at room temperature is about 4 torr.

The half-life of gold-198 is 2.77 days

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Answer:

it is the British imperial and united states customary systems

a) The strongest metal on the planet is tungsten.

When it comes to tensile strength, tungsten tops all other metals. One of the strongest metals known to man, tungsten has an ultimate strength of 1510 Megapascals.

In addition to having the greatest melting point of any unalloyed metal, tungsten boasts greater strength. Tungsten is frequently employed in electrical and military applications due to its strength.

Tin is a malleable, silvery-white metal that is highly flammable at ambient temperature.

Metal malleability is a complex subject. There is no objective test available to measure this feature, as we previously stated. We most frequently test it for hardness.

The most malleable and ductile metals are gold and silver. Pure gold and silver are too soft to be used to create items that will keep their shape.

Metals may be molded into different shapes, such as thin sheets or foils, without breaking or shattering because they are malleable. They are also ductile, making it simple to draw them into wires.

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Answer: by boiling it

Explanation:

By boiling the sap to remove water, also to concentrate the sugar that makes maple syrup.

When the conductivity is at a minimum, the true thing about the amount of Ba(OH)₂ is that the amount of the two reactants are the same when conductivity is low.

The ability of an aqueous solution to carry an electric current is measured by its conductivity. Ionic strength is measured by conductivity monitors. In automated chromatography systems, conductivity is the main input control parameter used to enable the generation of salt gradients or to control buffer dilution or in-line buffer preparation.

Conductivity monitors can be used to automate and monitor cleaning and equilibration procedures. It's important to remember that temperature affects measurements of conductivity and pH.

When conductivity is low, the amounts of the two reactants are equal. Between the reactants, there are no excesses. The aqueous solution cannot dissolve the precipitate BaSO₄. Since there are no ions, the conductivity is at its lowest.

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Complete question

The Ba(OH)₂ dissociates as Ba+2 + 2 OH-. H₂SO₄ dissociates as 2 H+ + SO₄-2. When the conductivity is at a minimum, what must be true about the amount of Ba(OH)₂ compared to H₂SO₄

Answer:

0.667 L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 250 mL

Initial concentration (C₁) = 12 M

Final concentration (C₂) = 4.5 M

Final volume (V₂) =?

The final volume of the solution can be obtained by using the dilution formula as illustrated below:

C₁V₁ = C₂V₂

12 × 250 = 4.5 × V₂

3000 = 4.5 × V₂

Divide both side by 4.5

V₂ = 3000 / 4.5

V₂ = 667 mL

Finally, we shall convert 667 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

667 mL = 667 mL × 1 L / 1000 mL

667 mL = 0.667 L

Thus, the volume of the solution prepared is 0.667 L

Answer:

Electrons

Explanation:

"An electron is a negatively charged particle that orbits the nucleus of an atom."

"Electrons are negatively charged particles arranged in orbits around the nucleus of an atom"

Answer:

[tex]d=6.34g/cm^3[/tex]

Explanation:

Hello there!

In this case, since the calculation of density is performed by dividing the mass over volume:

[tex]d=\frac{m}{V}[/tex]

Which gives us a better understanding of the degree of compactness of the object; we can find the required density in grams per cubic centimeter by applying the following dimensional analysis in the aforementioned equation:

[tex]d=\frac{0.0124kg}{1893mm^3} *(\frac{10mm}{1cm} )^3*\frac{1000g}{1kg}\\\\d=6.34g/cm^3[/tex]

Regards!

Answer:

[tex]\boxed {\boxed {\sf 3.3 \ liters}}}[/tex]

Explanation:

Molarity is a measure of concentration in moles per liter.

[tex]molarity=\frac{moles \ of \ solute}{liters \ of \ solution}}[/tex]

The solution has a molarity of 1.2 M or 1.2 moles per liter. There are 4.0 moles of NaCl, the solute. We don't know the liters of solution, so we can use x.

Substitute the values into the formula.

[tex]1.2 \ mol/L = \frac{4.0 \ mol}{x}[/tex]

Since we are solving for x, we must isolate the variable. Begin by cross multiply (multiply the 1st numerator and 2nd denominator, then the 1st denominator and 2nd numerator.

[tex]\frac {1.2 \ mol/L}{1}=\frac{ 4.0 \ mol}{x}[/tex]

[tex]4.0 \ mol *1=1.2 \ mol/L *x[/tex]

[tex]4.0 \ mol = 1.2 \ mol/L *x[/tex]

x is being multiplied by 1.2 moles per liter. The inverse of multiplication is division, so divide both sides by 1.2 mol/L

[tex]\frac{4.0 \ mol}{1.2 \ mol/L} = \frac{1.2 \ mol/L *x}{1.2 \ mol/L}[/tex]

[tex]\frac{4.0 \ mol}{1.2 \ mol/L}=x[/tex]

The units of moles (mol) will cancel.

[tex]\frac{4.0 }{1.2 } \ L =x[/tex]

[tex]3.33333333 \ L=x[/tex]

The original measurements both have 2 significant figures, so our answer must have the same. For the number we found, this is the tenths place.

The 3 in the hundredth place tells us to leave the 3 in the tenths place.

[tex]3.3 \ L\approx x[/tex]

Approximately  3.3 liters of solution are needed to make a 1.2 M solution with 4.0 moles of sodium chloride.