please help with chemistry work

Answer:

The [tex]K_{sp}[/tex] remains the same

Explanation:

Let's look at what actually happens in this scenario. Before we dive into the explanation, remember the principle of Le Chatelier: for a system at equilibrium, a specific disturbance in molarity/volume/pressure of any species in equilibrium would cause the equilibrium to shift towards the side that minimizes such a disturbance.

To begin with, we have a saturated water solution of lead(II) chloride. A saturated solution means that at the given temperature we have a maximum amount of lead(II) chloride that could dissolve in the given volume of water.

Since lead(II) chloride is not highly soluble, we have an equilibrium between the precipitate and the dissociated ions:

[tex]PbCl_2(s)[/tex]⇄[tex]Pb^{2+}(aq)+2Cl^-(aq)[/tex]

Now we're adding NaCl to this solution. Sodium chloride is a sparingly soluble salt which readily dissociates into sodium and chloride ions:

[tex]NaCl(aq)\rightarrow Na^+ (aq)+Cl^- (aq)[/tex]

Notice that sodium chloride increases the concentration of chloride ions in the solution, so the equilibrium between the precipitate and its ions is disturbed.

According to the principle of Le Chatelier, due to an increase in chloride ions, the equilibrium would be disturbed and the system would tend to decrease it in order to restore the equilibrium. Hence, the equilibrium shifts towards the precipitate forming more of the precipitate and decreasing the amount of lead(II) cation, as well as the excess of chloride ions. This is also called the common ion effect: the common ion decreases the solubility of a salt.

However, it only decreases the solubility of the salt but not the solubility product constant defined as:

[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]

A decrease in lead(II) concentration is compensated by the excess of chloride. The solubility product is only temperature-dependent, just as any other equilibrium constant, so it doesn't depend on the molarity of chloride or lead(II) ions.

Solubility, on the other hand, is equal to:

[tex]S=[Pb^{2+}]=\frac{K_{sp}}{[Cl^-]^2}[/tex]

And, as you can see, it decreases, as K is kept constant and we have an increase in chloride.

Answer:

The answer is the Ksp remains the same.

Explanation:

I got this answer right on an assignment.

Answer:

S orbital:spherical

P orbital:dumbbell

D orbital:double dumbbell

F orbital:complex

Explanation:

Answer:

Substances used to make the bomb

The area it was placed

Which people were in that area

How the bomb was set off

Explanation:

Examining the residues left at the scene by the bomb could tell forensics what the bomb was made out of, and the police could investigate possible leads about people who purchased (or have access to) such materials.

The area should give clues because security cameras could be used to trace who was there that should not be. There would be a possible suspect.

If it is a public place, then we can see if there is anyone of importance (to the suspect) that was there at that time.

If a remote detonator was used to set off the bomb, then the suspect would have to be relatively close to the bomb.

Answer:

Substances used to make the bomb

The area it was placed

Which people were in that area

How the bomb was set off

Answer:

potassium 3-ethylpentanoate

or

potassium 3-ethylpentanoic acid

Explanation:

This is an organic compound.

This is a salt of carboxylic acid

This compound have 5 carbon main chain

There is an ethyl group is attached on carbon 3

K (Potassium) substituted the H (hydrogen) of pentanoic acid and form salt of it.

This compound shown in ionic form as salt solution written in ionic form.

So,

the name will be

Potassium 3-ethylpentanoate

it is also named as potassium 3-ethylpentanoic acid

Note: you can write any one of them both are right

the structure and name is given in attachment

Answer:

how does gravity affect something

Explanation:

they study  physics.

hope this helped

Answer:

They are jogging side by side at 5 m/s

Let's distinguish between the concepts of speed and velocity:

The first condition we have here is the fact that two people have the same speed, this means they are moving at the same rate of change of distance. The second condition must be met as well, if we wish them to have the same velocity, this means they should be moving in the same direction, let's say, along the positive or negative x-axis, but not in opposite directions.

Answer:

The image is not accurate because

the heavier atoms are moving faster than the lighter ones

but the lighter ones must move faster than the heavier ones.

Explanation:

The image depicts the atoms of two different elements; atoms of lighter and heavier elements.

And the rate of diffusion (movement of atoms) of an element is inversely proportional to the square root of its molecular.

⇒ As the weight increases, the rate of diffusion (movement of atoms) decreases.

And as the weight decreases, the rate of diffusion (movement of atoms) increases.

so, heavier atoms move slowly compared to lighter atoms.

The image is not accurate because

the heavier atoms are moving faster than the lighter ones

but the lighter ones must move faster than the heavier ones.

Answer:

The answer is A on edge

Explanation:

The pair of elements Phosphorus and Bromine is most likely to form a covalent bond. Covalent bonds typically occur between nonmetals, as they share electrons to reach stability. Other given pairs, involving metals and nonmetals, are more likely to form ionic bonds.

Among the pairs of elements provided, the pair that is most likely to form a covalent bond is Phosphorus and Bromine. A covalent bond typically forms when two nonmetals, like phosphorus and bromine, share electrons. In contrast, sodium and magnesium are metals which usually form ionic bonds when they combine with nonmetals (like chlorine for sodium and oxygen for magnesium). Copper can also form ionic bonds with nonmetals like oxygen.

As an example, consider a molecule like oxygen gas (O=O). Each oxygen atom has six electrons in its valence shell and needs two more to reach stability. This stability is achieved when the two oxygen atoms share two pairs of electrons, forming a double covalent bond.

In contrast, consider the formation of sodium chloride (table salt). Sodium readily donates its single valence electron to chlorine, which needs only one more electron to be stable. This results in the formation of a sodium cation and a chloride anion, which are held together by an ionic bond.

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Answer:

The half life of element XY is 12 days

Explanation:

Given:

Time taken for  1024 grams to decay into 32 grams  = 60 days

To Find:

The half life of element XY = ?

Solution:

The Half life is calculated by

[tex]N = N_0 (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}[/tex]

[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{t}{log_{\frac{1}{2}}( \frac{N(t)}{N_0})}}[/tex]

Substituting the values,

[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{log_{\frac{1}{2}}( \frac{32}{1024})}}[/tex]

[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{log_{\frac{1}{2}}(0.03125)}}[/tex]

[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{5}[/tex]

[tex]t_{\frac{1}{2}}[/tex] = 12

Answer:

a) 0.25 g b) 0.01542 g

Explanation:

Half life of Po-218 = 3.04 minutes

initial mass = 1 g

after 3.04 minutes it will remain 0.5 g

after another 3.04 minutes it will remain 0.25 g

After 6 minutes it will remain approx 0.25 g

B) after another 3.04 minutes it will remain 0.125 g

after another 3.04 minutes it will remain 0.0625 g

after another 3.04 minutes it will remain 0.03125 g

after another 3.04 minutes it will remain 0.015625 g

After 18 minutes it will remain approx 0.01542 g

Answer:

[tex]K_2Cr_2O_7 (aq) + 14 HCl (aq) + 3 SnCl_2 (aq)\rightarrow 2 CrCl_3 (aq) + 7 H_2O (l) + 3 SnCl_4 (aq) + 2 KCl (aq)[/tex]

Explanation:

The products of this reaction are given by:

[tex]K_2Cr_2O_7 (aq) + SnCl_2 (aq) + HCl (aq)\rightarrow KCl (aq) + SnCl_4 (aq) + CrCl_3 (aq) + H_2O (l)[/tex]

Firstly, dichromate anion becomes chromium(III) cation, let's write this change:

[tex]Cr_2O_7^{2-} (aq)\rightarrow Cr^{3+} (aq)[/tex]

The following steps should be taken:

[tex]Cr_2O_7^{2-} (aq)\rightarrow 2 Cr^{3+} (aq)[/tex]

[tex]Cr_2O_7^{2-} (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]

[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]

[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 6e^-\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]

Similarly, tin(II) cation becomes tin(IV) cation:

[tex]Sn^{2+} (aq)\rightarrow Sn^{4+} (aq) + 2e^-[/tex]

Now that we have the two half-equations, multiply the second one by 3, so that it also has 6 electrons that will be cancelled out upon addition of the two half-equations:

[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 6e^-\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]

[tex]3 Sn^{2+} (aq)\rightarrow 3 Sn^{4+} (aq) + 6e^-[/tex]

Add them together:

[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 3 Sn^{2+} (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l) + 3 Sn^{4+} (aq)[/tex]

Adding the ions spectators:

[tex]K_2Cr_2O_7 (aq) + 14 HCl (aq) + 3 SnCl_2 (aq)\rightarrow 2 CrCl_3 (aq) + 7 H_2O (l) + 3 SnCl_4 (aq) + 2 KCl (aq)[/tex]

The diameter of  the pool is 4

Explanation:

To calculate the diameter we must write the values given in the question, here

The circumference of the pool is given as C=12.56 feet.

To calculate the diameter of the pool,

If radius is given, Multiply the radius by 2

If Circumference is given divide the circumference by Pi (π)

the constant value for  Pi (π)=3.14

Diameter(D)= C/π

12.56/3.14

=4

The diameter for the plastic wading pool is 4

Explanation:

The van der Waals' forces are the forces that exist between the millions of separate water molecules, and not between the hydrogen and oxygen atoms in the case of water. Dipole-Dipole forces are one of van der Waals' three forces. ... For example, HCl comprised of the atom Hydrogen and Chlorine is polar.

Answer:

The mathematical formula expressing Newton's Second Law of Motion is :

F = ma

Explanation:

Second Law of Motion : It states that external unbalanced force is directly proportional to rate of change of momentum.

Its formula becomes : F = ma

[tex]F = \frac{m(v-u)}{t}[/tex]

Put,

[tex]\frac{(v-u)}{t} = a[/tex]

F = ma

Answer:

F = ma

Explanation:

Answer:

a. [tex]2.69 pm[/tex]

b. [tex]4.42\cdot 10^{-34} m[/tex]

Explanation:

The de Broglie wavelength can be found by the following equation:

[tex]\lambda_{dB} = \frac{h}{mv}[/tex]

Here:

[tex]\lambda_{dB}[/tex] is the de Broglie wavelength (in m);

[tex]h[/tex] is the Planck's constant, [tex]h = 6.626\cdot 10^{-34} J\cdot s[/tex];

[tex]m[/tex] is mass (in kg);

[tex]v[tex] is velocity (in m/s).

a. We need to know the mass of an electron here:

[tex]m_e=9.11\cdot10^{-31} kg[/tex]

And the speed of light:

[tex]c = 3.00\cdot 10^8 m/s[/tex]

The fraction of the speed of light is:

[tex]\omega = 0.90[/tex]

Substituting into the equation:

[tex]\lambda_{dB} = \frac{h}{\omega c m_e}=\frac{6.626\cdot10^{-34} J\cdot s}{0.90\cdot 9.11\cdot 10^{-31} kg\cdot 3.00\cdot 10^8 m/s} = 2.69\cdot 10^{-12} m = 2.69 pm[/tex]

b. Similarly, here we have:

[tex]m_b=150 g = 0.150 kg[/tex]

And the velocity of:

[tex]v = 10 m/s[/tex]

We obtain:

[tex]\lambda_{dB}={6.626\cdot 10^{-34} J\cdot s}{0.150 kg\cdot 10 m/s} = 4.42\cdot 10^{-34} m[/tex]

Notice that the wavelength of a large object is smaller by a fraction of:

[tex]\frac{2.69\cdot 10^{-12} m}{4.42\cdot 10^{-34} m} = 6\cdot 10^{21}[/tex]

This means the de Broglie wavelength of a macroscopic object is negligible compared to the wavelength of a microscopic object.

Answer:

[tex]2 NaOH (aq) + H_2SO_4 (aq)\rightarrow 2 H_2O (l) + Na_2SO_4 (aq)[/tex]

Explanation:

Let's correct and balance the given equation:

The equation becomes:

[tex]NaOH (aq) + H_2SO_4 (aq)\rightarrow H_2O (l) + Na_2SO_4 (aq)[/tex]

We require 2 NaOH in order to balance the two sodium cations on the right, this would yield a total of 4 hyrogens on the left, so we also need two water molecules to balance it fully:

[tex]2 NaOH (aq) + H_2SO_4 (aq)\rightarrow 2 H_2O (l) + Na_2SO_4 (aq)[/tex]

Answer:

-21 kJ·mol⁻¹  

Explanation:

Data:

                    H₃O⁺ +  OH⁻ ⟶ 2H₂O

       V/mL:    50         50  

c/mol·dm⁻³:   1.0         1.0

ΔT = 4.5 °C  

       C = 4.184 J·°C⁻¹g⁻¹

C_cal = 50 J·°C⁻¹

Calculations:

(a) Moles of acid

[tex]\text{Moles of acid} = \text{0.050 dm}^{3} \times \dfrac{\text{1.0 mol}}{\text{1 dm}^{3}} = \text{0.050 mol}\\\\\text{Moles of base} = \text{0.050 dm}^{3} \times \dfrac{\text{1.0 mol}}{\text{1 dm}^{3}} = \text{0.050 mol}[/tex]

So, we have 0.050 mol of reaction

(b) Volume of solution

V = 50 dm³ + 50 dm³ = 100 dm³

(c) Mass of solution

[tex]\text{Mass of solution} = \text{100 dm}^{3} \times \dfrac{\text{1.00 g}}{\text{1 dm}^{3}} = \text{100 g}[/tex]

(d) Calorimetry

There are three energy flows in this reaction.

q₁ = heat from reaction

q₂ = heat to warm the water

q₃ = heat to warm the calorimeter

q₁ + q₂ + q₃ = 0

     nΔH   +         mCΔT       + C_calΔT = 0

0.050ΔH + 100×4.184×4.5 +   50×4.5  = 0

0.050ΔH +          1883        +      225    = 0

                                  0.050ΔH + 2108 = 0

                                              0.050ΔH = -2108

                                                        ΔH = -2108/0.0500

                                                              = -42 000 J/mol

                                                              = -42 kJ/mol

This is the heat of reaction for the formation of 2 mol of water

The heat of reaction for the formation of mol of water is -21 kJ·mol⁻¹.

Answer:

ls most commonly viewed as a metals

Answer:

Look for predictable changes and patterns - Apex

Answer:

Look for predictable changes and patterns

Explanation:

Ap3x

Answer:

The precipitate will form.

Explanation:

Let's write the equilibrium expression for the solubility product of calcium sulfate:

[tex]CaSO_4(s)[/tex] ⇄ [tex]Ca^{2+}(aq)+SO_4^{2-}(aq)[/tex]

The solubility product is defined as the product of the free ions raised to the power of their coefficients, in this case:

[tex]K_{sp}=[Ca^{2+}][SO_4^{2-}]=10^{-4.5}[/tex]

Our idea is to find the solubility quotient, Q, and compare it to the K value. A precipitate will only form if Q > K. If Q < K, the precipitate won't form. In this case:

[tex]Q_{sp}=[Ca^{2+}][SO_4^{2-}]=5.00\cdot10^{-2} M\cdot7.00\cdot10^{-3} M=3.5\cdot10^{-4}[/tex]

Now given the K value of:

[tex]K_{sp}=10^{-4.5}=3.2\cdot10^{-5}[/tex]

Notice that:

[tex]Q_{sp}>K_{sp}[/tex]

This means the precipitate will form, as we have an excess of free ions and the equilibrium will shift towards the formation of a precipitate to decrease the amount of free ions.

Answer:

0.6 Molar

Explanation:

According to the Question,

In 500 mL of water ,

0.2 mol sample of MgCl is present and 0.1 mol of KCl is present.

Thus ,

Concentration of Cl anion in the solution will be the sum of Cl anion concentration from MgCl and KCl.

From MgCl , 0.2 mol of Cl anion will come and 0.1 mol of KCl anion will come ,

Thus , 0.3 mol of Cl anion will come totally .

So, Cl anion concentration will be [tex]\frac{0.3}{0.5}[/tex] = 0.6 M

The concentration of Cl⁻ in the solution, after dissolving 0.20 mol MgCl₂ and 0.10 mol KCl and diluting to 500 mL, is 1.0 M.

To determine the concentration of Cl⁻ ions in the solution, we need to calculate the total moles of Cl⁻ ions from both MgCl₂ and KCl after dissolving them in water.

Magnesium chloride (MgCl₂) provides two moles of Cl⁻ for every mole of MgCl₂. Hence, 0.20 moles of MgCl₂ will produce 0.20 x 2 = 0.40 moles of Cl⁻.

Potassium chloride (KCl) provides one mole of Cl⁻ for every mole of KCl. Therefore, 0.10 moles of KCl will give 0.10 moles of Cl⁻.

Adding the total moles of Cl⁻ from both salts gives us 0.40 moles + 0.10 moles = 0.50 moles.

To find the concentration of Cl⁻ in the final solution, divide the total moles of Cl⁻ by the volume of the solution in liters. Since the solution volume is 500 mL, which is equivalent to 0.500 L, we perform the following calculation:
Concentration of Cl⁻ = 0.50 moles / 0.500 L = 1.0 M.

Therefore, the correct answer is that the concentration of Cl⁻ in the solution is 1.0 M.

Answer:

32

Explanation:

The maximum number of electrons can be calculated by using the expression 2n2

when n = 4

substitute n for 4

2(4)2

2(16) = 32

Answer:

32

Explanation:

Answer: answer is D

Explanation:

Our digestive has the steps of digestion and absorption associated with it. So all the compounds taken in as food are first broken down into simpler components before absorption.

ATP or Adenosine Triphosphate is a compound containing a molecule of adenine as nitrogen base, a ribose sugar and three molecules of phosphate attached with the adenine in a chain. Its unable to get absorbed into the system as ATP itself. In intestine, it will be broken down into Adenine, ribose, and phosphates and then absorbed individually into blood.

Thus even if we consume raw ATP, we can't bypass the process of ATP formation. So, there's no significance. And secondly, ATP is very expensive and not suitable for consumption itself.

Answer:

When observing the image inside a spoon, the image seems to be bent or cut, because the rays of light deviate with a  certain angle of incidence, since they travel slower when passing from the air, where there are less particles, to the liquid, where there are more particles .

When turning the spoon a specular reflection is observed, it is when the surfaces are polished, the light rays are reflected with and angle of reflection in only one direction and in an orderly manner. This is why images are formed that look like copies of objects.

Explanation:

Reflection and refraction of waves are two phenomena that occur when a wave that propagates in a certain medium meets a separation surface with another medium.

Reflection is the change in direction that a wave experiences when it comes into contact with the surface that separates two media while returning to the point where it originated. Refraction is the change of direction and speed that a wave undergoes obliquely on a surface that separates two media with different refractive indices.

Looking at your reflection in a shiny soup spoon is a result of light reflection. The angle of incidence and angle of reflection are equal, resulting in an upright and undistorted image. The back of the spoon is concave, causing an upside down and distorted reflection.

When you look at your reflection in the side of a shiny soup spoon, you will see an upright and undistorted image. This is because of the reflection of light. The angle at which light hits the spoon, known as the angle of incidence, is equal to the angle at which it reflects off the spoon, known as the angle of reflection. The back of the spoon is concave, so when you look at your reflection in it, the image will be upside down and distorted.

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Florida experiences the first day of spring when Earth is in Position 3 with respect to the Sun. On or about March 21, known as the vernal equinox, neither hemisphere is favored, and the Sun crosses the celestial equator, marking the first day of spring.

Florida, which is located in the Northern Hemisphere, experiences the first day of spring when Earth is in Position 3 with respect to the Sun. On or about March 21, known as the vernal equinox, the Sun is on the celestial equator. This means that every place on Earth receives roughly 12 hours of sunshine and 12 hours of night. During this time, neither hemisphere is favored, and the Sun crosses the celestial equator, marking the first day of spring.

Answer:

In polar Covalent bonds, the electrons which are in bonded shifts towards an atom which has more valance electrons.

Explanation:

We know if an atom takes the electron it acquires a negative charge whereas if it gives an electron it acquires a positive charge in the ionic bond. But here we are talking about covalent bonds. Covalent bonds are those in which atoms share the electron instead of completely giving off the electron. If the atoms are identical in case of covalent bond that is 2 hydrogen atoms then this type of bonding is called pure covalent bonds but if the atoms linked in covalent bonds are different then it is called polar covalent bonds.

In this, the bonding electrons will shift towards an atom which has more valence electron thereby acquiring the partial negative charges and the other atom will acquire a partial positive charge. For example, HCl. In this the Chlorine atom is having more valence electron than hydrogen atom, and hence Chlorine atom has a partial negative charge and Hydrogen atom has a partial positive charge.

In polar Covalent bonds, the electrons that are in bonded shifts towards an atom that has more valance electrons.

The following information should be considered:

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The number of neutrons that would equal a mass of one gram is approximately 6 x 10^23, which is also known as Avogadro's number.

To find the number of neutrons that would equal a mass of one gram, you would need to divide the desired mass (1 gram) by the mass of a single neutron, which is 1.67 x 10^-24 g. So, the calculation would be 1 g / 1.67 x 10^-24 g = approximately 6 x 10^23 neutrons. This number is also known as Avogadro's number, a familiar concept in chemistry and physics.

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Answer:

To find the number of neutrons we would subtract the number of protons from mass number of an atom.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example:

The mass number of carbon is 12 amu and it has six protons thus to find the number of neutrons we would subtract the 6 from 12 and get number of neutrons.

12- 6 = 6 neutrons