A scientist wants to test the effects of different potassium chloride, KCI, solution concentrations. Potassium chloride is sometimes used to treat conditions that result from potassium depletion, such as cardiac or kidney disease. The scientist dissolves 255 g KCI to make a 3.20 L solution. Use the space provided to calculate the molarity of the potassium chloride solution.

pH of a solution that is 0.059M NH₄Cl at 25°C is 9.7

pH is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions

Here given data is Kb=1.8×10⁻⁵ and we have to find pH pH of a solution that is 0.059M NH₄Cl at 25°C = ?

So, NH₄Cl dissociates completely in solution into NH₄⁺ and Cl⁻ NH₄⁺ being the conjugate acid of the base NH₃ and has a Ka = Kw/ Kb = 1.0×10⁻¹⁴/1.8×10⁻⁵ = 5.55×10⁻¹⁰ and the solution behaves acidic due to NH₄⁺ as it gives rise to H₃O⁺ on dissociation Cl⁻ because it is the conjugate base of the strong acid HCl is an extremely weak base and is unable to affect the pH of the solution measurably

NH₄⁺ dissociates as follows

NH₄⁺ + H₂O ⇔ H₃O+ + NH₃

So, [H3O⁺] = [NH₃], [NH₄⁺]= c - [NH₃]

Ka = [H₃O⁺] × [NH₃]/[NH₄⁺] =[H₃O⁺]²/{c - [H₃O⁺]}

So, neglecting [H₃O⁺] against c, we get

[H₃O⁺]= (Ka × c)¹/²

[H₃O⁺]=(5.55×10⁻¹⁰×0.059)¹/²

[H₃O⁺] = 1.64×10⁻¹⁰

pH = -log (1.64×10⁻¹⁰)

pH = 10-log1.64

pH = 9.7

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The evidence which the attorney will most likely use to prove this accusation is Jared’s fingerprints in the car and is denoted as option C.

These refers to the information and happenings which help to prove that something is true and is used in investigations so as to ensure that the culprit is caught.

In this case, Jared’s fingerprints in the car is the most reliable information which puts him at the scene of the crime as it can't be edited and no fear of false witnesses as a result of this thereby making it the correct choice.

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Answer: C

Explanation:

Answer:

58.32

Explanation:

The mass number is one mole and for Mg it is 24.306 for O it is 15.999 and for H it is 1.008. because O and H have 2, you multiply them by 2 and add all the numbers and it equals 58.32

The isotope that has the greater abundance is lithium-7

To know which isotope has the greater abundance, we shall detertmine the abundance of each isotope. This can be obtained as follow:

Average atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100]

6.94 = [(6.02 × A) / 100] + [(7.02 × (100 -A) / 100]

6.94 = 0.0602A + 7.02 + 0.0702A

Collect like terms

6.94 - 7.02 = 0.0602A - 0.0702A

-0.08 = -0.01A

Divide both sides by -0.01

A = -0.08 / -0.01

A = 8%

Thus,

B = 100 - A

B = 100 - 8

B = 92%

From the above calculations, we obtained:

Thus, we can conclude that lithium-7 has the greater abumdance

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If you are on 4.16 Chemical Reactions and have 18 questions, then go to the following on Quizlet for further help. Thanks and good luck!

Quizlet - "4.6 Chemical Reactions UT"

h t t p s : / / q u i z l e t . c o m / _ c 7 3 1 u j ? x = 1 q q t & i = 3 8 n a a s

All the given chemical reactions are considered to be chemical change as they are accompanied  by change in state and even evolution of gases.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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The volume of the balloon at 2.00 × 104m: 1.52x[tex]10^3[/tex] L

Given:

[tex]P_i[/tex]  = 1.0 [tex]atm[/tex]      -> absolute atmospheric pressure

[tex]P_f[/tex]  = 61.0 mm Hg -->  atmospheric pressure

    = (61.0/760) [tex]atm[/tex]

    = 0.0802 [tex]atm[/tex]

[tex]V_i[/tex] = 171 L

[tex]T_i[/tex] = 20.0 [tex]^oC[/tex]

 = (20.0+273) K

 = 293 K

[tex]T_f[/tex] = 210.0 K

[tex]\frac{P_i \times V_i}{T_i} = \frac{P_f \times V_f}{T_f}[/tex]

(1 [tex]atm[/tex] * 171 L) / (293.0 K) = (0.0802 [tex]atm[/tex] * [tex]v_f[/tex])/(210.0 K)

[tex]V_f[/tex] = 1.52x[tex]10^3[/tex] L

The air around you has weight and it weighs down everything it touches. This pressure is called atmospheric pressure or atmospheric pressure. This is the force that the air above it exerts on the surface when gravity pulls it toward the ground. Air pressure is usually measured with a barometer.

Examples of air pressure, when you press an onion, there is  air  in the tube and the onion comes out as bubbles. However, there is air pressure on the surface of the liquid. When we release the bulb,  water moves inside the tube.

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As per the provided figure, there is a presence of the multilayers of substances settled according to their density. The densest liquid will settle at the bottom while the least dense will float at the top.

Density can be said as the substance's mass per unit of volume when explained in the mathematical terms. The measure of how much dense a substance is can be taken out through a measure of its density.

According to the pic the layers arranged here can be classified according to the order from least dense liquid to the densest liquid according to the provided order

Rubbing alcohol < Dish Wash < Milk < Corn Syrup

Then according to the respective positions of the solids arranged throughout the multilayer of the pic, the provided order can be devised that is from the least dense solid to the densest solid:

Ping pong ball < Beads < Popcorn Kernels < Bolt

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Complete Question

1) Order the following liquids in order form the least dense to the densest. Dish Soap, Rubbing Alcohol, Milk, Corn Syrup.

2) Order the following solids in order from the least dense to the most dense: Bolt, Beads, Ping Pong Ball, Popcorn Kernel

The mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

To calculate the mass of nitrogen using formula,

n = W / w

where,

n is mass of nitrogen

W is molecular weight of N₂O₂

w is weight of solution

So, given data are :

w = 13.2 g

W = 60.013 g

n = ?

Now, putting the values we get,

n = 60.013 / 13.2

n = 4.55 g

Hence, the mass of the nitrogen in solution of N₂O₂, n = 4.55 g.

The inorganic substance dinitrogen dioxide has the chemical formula N₂O₂. It is conceivable to have many structural isomers. Based on ab initio calculations, the covalent bonding pattern O=N-N=O is projected to be the most stable isomer and is the only one that has been created experimentally.

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Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.

Compared to other anthropogenic greenhouse gases carbon dioxide has the largest relative contribution to increasing the greenhouse effect. Compared to other greenhouse gases, carbon dioxide is most effective at trapping heat near the surface. Carbon dioxide is called a greenhouse gas because it is one of the gases in the atmosphere that warms the earth through a phenomenon called the greenhouse effect.

Water vapor is the most powerful greenhouse gas in the Earth's atmosphere and a unique player among greenhouse gases. The amount of water vapor in the atmosphere is usually not directly changed by human actions. It depends on the air temperature. Compared to other anthropogenic greenhouse gases, carbon dioxide has the largest relative contribution to the increase in the greenhouse effect.

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The balanced chemical reaction equation as we can see from the question on the left and right hand sides;

[tex]3H_{2} + N_{2} ------- > 2NH_{3}[/tex]

Now we know that we use the chemical reaction equation to show the relationship between the reactants and the products in the system. We know that there is need to balance the chemical reaction equation so that we can be able  to make sense of a given chemical reaction equation.

A chemical reaction equation is said to be balanced when the number of atoms of each of the elements on the reactant side is the same as the number of atoms of each of the elements on the products side. This could also be called the process of making an atom count to show the number of each of the atoms present in the system.

The principle stated above is used to obtain the balanced chemical reaction equation. If we apply it, we would then be able to obtain the equation as have been shown in the answer section above.

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Converting 6.2 GL/s to m^3/hr we get 84.94 m^3/hr , as an one Gallon per second is equals to 13.627 cubic meters per hour.

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The image they show us is a solubility graph. It tells us the grams of solute that dissolve at a certain temperature. We must first identify the mentioned solute, this is NaNO3. We must draw a vertical line that passes through 30°C and a horizontal line that passes through 90 grams/100g of water.

When tracing the lines we see that the intersection is below the solubility curve of NaNO3. This means that there is less solute than the maximum amount that water can dissolve at 30°C. Therefore, all 90 grams will dissolve and we will have an unsaturated solution.

Answer: Third option. unsaturated

The amount, in grams, of calcium hydroxide that would be required for the complete reaction with 23.1 g sulfuric acid will be 17.44 grams.

In order to solve this problem, we first need to get the balanced equation of the reaction:

[tex]H_2SO_4 + Ca(OH)_2 -- > CaSO_4 + 2H_2O[/tex]

For a complete reaction, the mole ratio of the sulfuric acid to calcium hydroxide is 1:1.

Recall that: mole = mass/molar mass

Molar mass of sulfuric acid = 98 g/mol

Mole of 23.1 grams sulfuric acid = 23.1/98

                                             = 0.2357 moles

This means the mole of calcium hydroxide required will also be 0.2357 moles.

Now, let's find the equivalent mass of the calcium hydroxide.

Mass = mole x molar mass

Molar mass of calcium hydroxide = 74 g/mol

Mass of 0.2357 calcium hydroxide = 0.2357 x 74

                                                      = 17.44 grams

Thus, the mass of calcium hydroxide that would be needed for a complete reaction is 17.44 grams.

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From Hund's rule, we can now see why the two 2p orbital electrons occur singly and are not paired in one orbital.

According to the Hund's rule, we know that before, we can pair the electrons that are present in the atoms of an element, the electrons must first of all occur singly or have the maximum parallel spins before they are pair.

In this case, we have an electron that has six electrons. The electron configuration of the element has been shown in the image attached. we can see that there are two electrons that singly occupy the 2p orbitals.

This serves to validate the Hund's rule.

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Answer:

We have an electron that has six electrons, and there are two electrons that singly occupy the 2p orbitals. According to Hund's rule, electrons arise singly in an atom before pairing occurs.

Explanation:

There are 2 maximum number of moles of [tex]SO_{3}[/tex] that can be produced by the reaction of 2.0 mol of S with 3.0 mol of [tex]O_{2}[/tex] .

The chemical reaction of the formation of [tex]SO_{3}[/tex] from S and [tex]O_{2}[/tex] is given as,

2S + 3 [tex]O_{2}[/tex] → 2 [tex]SO_{3}[/tex]

From the above chemical equation we can conclude that the 2 moles of sulfur and 3 moles of oxygen reacts to form 2 moles of [tex]SO_{3}[/tex] .

A chemical equation can be considered in terms of moles , or 6.023 times ten to the 23 , which is a predetermined number of molecules or atoms . We can then calculate the weight required for each compound using moles and atomic weight, which is the weight in grams of 1 mole of a specific element in reaction .

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To find the net ionic equation we must first write the balanced equation for the reaction. We must bear in mind that the reagents Ca(NO3)2 and Na2S are in the aqueous state and as product we will have CaS in the solid state, since it is not soluble in water and NaNO3 in the aqueous state.

The balanced equation of the reaction will be:

Ca(NO3)2(aq) + → Ca(aq) + 2Na(s)NO3Now, c(aq)ompounds in the aqueous state can be written in their ionic form, so the reaction will transform into:Na2S +

So, the answer will be option A

Answer:

[A-] : [HA] = 1000 : 1

Explanation:

I'm assuming that you mean a pKa of 5 not a pa of 5
For this question, the equation:
pH = pKa + log([A-]/[HA])
plug in pH and pKa
8 = 5 + log([A-]/[HA])
move the 5 from the right to the left
3=log([A-]/[HA])
raise 10 to both sides of the equation to get rid of the log
10^3=10^(log([A-]/[HA]))
1000=[A-]/[HA]
so the ratio of [A-] to [HA] is 1000 to 1

852 grams of chromium carbonate needs to be measured out to produce 3 moles of chromium carbonate.

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Answer: 4.076L

Explanation:  The formular for Molarity is moles/Volume

So 0.280M = 0.0687 mol/Volume

Divide both sides by the moles

0.280M/0.0687mol = _______ liters

4.0756  = 4.076 Liters

The molar mass of the unknown gas is 31.74 g/mol

The molar mass of a substance is the mass in grams of 1 mole of the substance

Here given data is sample of an unknown gas is found to have a density of 1.31 g/L  at a pressure of 0.621 atm and a temperature of 54 °C and we have to fond molar mass = ?

So given data is

Density = 1.31g/L

Pressure = 0.621 atm

Temperature = 54°C means 54 + 273.15 = 326.15 K

So, the formula is PV = nRT

R = Rydberg constant = 0.0821 atm/k⁻mol

n = PV/RT

n = 0.621 atm×1.31g/L/0.0821 atm/k⁻mol×326.15 K

n = 31.74 g/mol

The molar mass of the unknown gas is  31.74 g/mol

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4.33 L of solution is needed to prepare a 4.20 M HCL solution that contains 655 g HCL.

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According to the concept of molar mass , in a sample of copper carbonate  there would be 26.47 g and 20 g of copper and oxygen respectively.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

In the given problem , sample of copper carbonate has copper, carbon and oxygen in the ratio of 63.54:12:48.Now, for 5 g carbon , amount of copper is calculated as,

5×63.54/12=26.47 g

And amount of oxygen is calculated as,

5×48/12=20 g.

Hence, for 5 g carbon there is 26.47 g copper and 20 g oxygen in copper carbonate sample.

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Answer: every object in the universe with some mass attracts every other object. As the law of gravitation could be applied to all such objects, it is also known as Newton's law of universal gravitation, that is, its application is universal.

Explanation:

1.MgSO4 can be created in the given reaction with a mass of 1.985 grams.

2. MgSO4 has a percent yield of 10.68%.

The amount of solution a chemical is present in determines its molarity (M). Molarity is the measure of a solute's concentration in a solution expressed in moles per liter. Molarity is another term for a solution's molar concentration.

1.The following is the full, balanced chemical equation:

Na₂SO₄(aq)+MgCl₂(aq)⟶MgSO₄(s)+2NaCl(aq)

We are aware,

Molarity (M) is the quantity of moles (n) in a liter of solution.

Volume x Molarity equals the number of moles of Na2SO4.

Moles of Na₂SO₄ = 0.190×0.0871

Moles of Na₂SO₄ = 0.016549 moles.

Moles of MgCl₂ = 0.311×0.144

Moles of MgCl₂ = 0.044473 moles.

As can be seen, there are less moles of Na2SO4 present.

Na2SO4 will therefore operate as a limiting agent and regulate the reaction.

Moles of Na₂SO₄ = Moles of MgSO4

Moles of MgSO₄ = 0.016549 moles.

As we are aware,

Mole = mass produced/molecular weight

Molar mass of MgSO₄ = 120grams/mole

substituting the values,

0.016549 = mass of Mg produced/120

Mass of MgSO₄ produced = 1.985 grams.

2. Formula for percentage yield: (experimental mass divided by theoretical mass, multiplied by 100)

Theoretical mass = 1.985 grams

Experimental mass = 0.212 grams.

Percentage yield = 0.212/1.985×100

Percentage yield of MgSO₄ = 10.68%.

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The color of light from a photon with an energy of 4.40x10⁻¹⁹ J is red

A photon is an elementary particle that is a quantum of the electromagnetic field including electromagnetic radiation such as light and radio waves and the force carrier for the electromagnetic force

The color of a photon is determined by the wavelength of the emission and photons are quanta of light, meaning they are a specific unit of emitted energy and here given energy is 4.40x10⁻¹⁹J means when it come to visible light the highest frequency color is violet also has the high energy and when the low frequency of visible light which is red has the low energy and here the energy is low that's why the color of photon is red

E = 4.40x10⁻¹⁹ J

E = hc/λ

where, λ is the wavelength, h be the Plank's constant and c be the velocity of light.

h = 6.63 × 10⁻³⁴ Js

c = 3 ×10⁸ m/s

λ =  6.63 × 10⁻³⁴ Js × 3 ×10⁸ m/s/ 4.40x10⁻¹⁹ J

λ =  4.520 nm

So, color of light from a photon with an energy of 4.40x10⁻¹⁹ J is red

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The mass of the sample in grams is 115.53 × [tex]10^{-3}[/tex].

The weight of an atom has been its atomic mass. Although the kilogram is the standard international measurement of mass, the unified atomic mass unit, or Dalton, is frequently used to express atomic mass. One Da is equal to one-twelfth of the mass of a free carbon-12 atom in its ground state.

The quantity of material that makes up an element's atom, its atomic mass. It is stated as a multiple of 1.992646547 1023 gram, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. An element's atomic unit (amu), on the this measure, is equivalent to 1.660539040 1024 grams. The Dalton (Da) is yet another term again for atomic mass unit which commemorates the English chemist John Dalton.

Silver has an atomic mass of 107.87 g/mol.

There are 6.022 × [tex]10^{23}[/tex] atoms in one mole of anything.

You have 6874 × [tex]10^{20}[/tex] atoms of Ag.

So:

6.45 x [tex]10^{20}[/tex] atoms × 1 mol/(6.022 x [tex]10^{23}[/tex]) atoms × 107.87 grams Ag/mol

=    115.53 × [tex]10^{-3}[/tex]grams

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a)  Fe does not fit in the Colum 7, Because Fe shows different in chemical Properties. its valance electron configuration  is different from oxygen and sulfur.

b) The gaps that Mendeleev left in his table were one of its distinctive features. He not only predicted the existence of yet-undiscovered elements in these locations, but also their atomic weights and other properties.

c) The modern periodic  table is the arrangement of elements in increasing order of their atomic numbers.

d) Lithium ,potassium  and Sodium have electronic configuration end with S1. since  they are in group 1.

The current periodic law serves as the foundation for the periodic table's lengthy form. The elements are organized in the table in ascending order of their atomic numbers. The periodic chart as it exists now is known as the contemporary periodic table. 18 vertical columns and 7 horizontal rows make up the structure.

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Answer:

d valance electrons

Explanation:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair.

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Answer:

Heliocentric system

Explanation:

Copernicus suggested that the Solar System's center should be the Sun rather than the Earth. A heliocentric system is the name given to such a model.

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