HELP!!!! if 3.50 moles of sodium hydroxide reacts with excess lead(II) nitrate, how many moles of Pb(OH)2 are produced?

Answer:

A chemical reaction is occurring and energy is released.

Explanation:

Heat is released when you combine a strong acid with water, considered exothermic. That's why it's extremely important to add the acid to a large volume of water; not vice versa.

When water and sulfuric acid are mixed together at room temperature the exothermic reaction occurs and energy is released during the chemical reaction. Therefore, option (B) is correct.

An exothermic process can be explained as a thermodynamic process or reaction that liberates energy from the system to its surroundings, generally in the form of heat, light, or sound.

While an endothermic process is an inverse of an exothermic process where the energy absorbs in the form of heat. In the chemistry of chemical reactions, the bond energy is changed into thermal energy during the bond formation.

The energy that is liberated by the reaction happens in the form of the kinetic energy of molecules. The transition of electrons from one energy level to another energy level released energy.

The mixing of water and strong acid such as sulfuric acid release a large amount of energy which even causes the splash of the mixture. Therefore, we avoid adding water to acid instead of we dilute the acid by adding acid to water.

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Answer:

the answer is option B is i guess

If the pH of a solution increases from 4.0 to 6.0, the hydronium ion concentration will be increased by a factor 100.

The potential of Hydrogen is the complete version of pH. The negative logarithm of H+ ion concentration is known as pH. As a result, the definition of pH is "potential hydrogen strength." The concentration of hydrogen ions in a particular solution is known as pH, and it is used to determine whether a solution is acidic or basic.

It can be expressed as:

pH = -log [[tex]H_{3}O[/tex]]

Calculation of concentration of hydronium ion with pH formula:

It can be written as,  [[tex]H_{3}O[/tex]] = [tex]10^{pH}[/tex]

Case 1: pH = 4

when pH = 4, put the value of pH in above expression.

[[tex]H_{3}O[/tex]] = [tex]10^{4}[/tex] = 10000.

Case 2: pH = 6

when pH = 6, put the value of pH in above expression.

[[tex]H_{3}O[/tex]] = [tex]10^{6}[/tex] = 1000000.

[[tex]H_{3}O[/tex]]1 /  [[tex]H_{3}O[/tex]]2 = 10000/1000000

[[tex]H_{3}O[/tex]]1 / [[tex]H_{3}O[/tex]]2 = 1 / 100

Therefore, the concentration of hydronium will be increased by a factor 100.

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Explanation:

The number of protons and neutrons. you can simply subtract the number of protons, or atomic number, from the mass number to get your final answer.

Answer:

They Are All Very Good Statements But I Will Go With "A"

Explanation:

I go with "A" Because In The statement it has a cause an effect, it has a positive term and a negative term, in other uses it is "A" between energy inputs and outputs, and events.

The statement that correctly describes the relationship between the event and its effect on energy inputs and outputs is Option A .

Energy is defined as the capacity to do work .

There are various types of Energy , Light Energy , Sound Energy , Solar Energy , Wind Energy etc .

Volcanic eruptions emit huge amounts of volcanic dust, sulfur compounds and water vapor into the atmosphere .

This reduces the atmospheric transparency and that results into causing hindrance to the solar radiation penetration in the earth's surface ,

This results in short term cooling effect over large areas of earth.

Among all the statements , Option A , The eruption of a volcano increases the concentration of particles in the atmosphere, which decreases the amount of energy that can reach Earth from the Sun in the short term , correctly describe the relationship between the event and its effect on energy inputs and outputs.

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Answer:

The nitrogen atom is sp³ hybridized

This is trigonal pyrymid shape

Explanation:

Step 1: Data given

A compound contains only nitroen (N) and Iodine (I)

The procent of nitrogen by mass = 3.55%

Atomic mass of N = 14.0 g/mol

Atomic mass of I = 126.9 g/mol

Step 2: Calculate mass % of iodine

Mass % iodine = 100 % - 3.55%

Mass % iodine = 96.45 %

Step 3: Calculate number of moles

Let's suppose the total mass = 100 grams

Mass of N = 3.55 grams

Mass of I = 96.45 grams

Moles N = 3.55 grams / 14.0 g/mol = 0.254 moles

Moles I = 96.45 grams / 126.9 g/mol = 0.760 moles

Step 4: Calculate empirical formula

For 0.254 moles N we have 0.760 moles I this is 1:3

This means that for 1 mol N we have 3 moles I

The empirical ( and also the molecular) formula is I3N

The nitrogen atom is sp³ hybridized.

This is trigonal pyrymid shape

Answer:

Following are the responses to the given question:

Explanation:

In many analyses, the homogenous sample with only a particular identity group is desired. Units were picked here depending on their similar characteristics so because research is specifically interested in these qualities. The downside of a homogeneous sample is nevertheless that the exterior validity of a study is decreased. In other words, any results obtained could be appropriately widespread to the general population. On either hand, a heterogeneous sample is capable of overcoming this difficulty, because its diversity is the typical pattern of any sort of sample distortion inside the broader population.

Answer:

6.56x10⁻³ mol

Explanation:

First we calculate how many HCl moles are there in 50.0 mL of a 0.1800 M solution:

Then we need to calculate how many HCl moles were in excess, that number is the same as the number of NaOH moles they reacted with:

Finally we calculate the difference between the original number of HCl moles and the number remaining after the reaction with XnCO₃:

Answer:

B.0.558M

Explanation:

M=n/L

n=m/Mm

Mm=NaOH

=23+16+1

=40g/mol

n=m/Mm

= 38/40

=0.95

M=n/L

=0.95/1.70

=0.558

Answer:

3.68 grams.

Explanation:

First we convert 9.5 g of NaCl into moles of NaCl, using its molar mass:

9.5 g ÷ 58.44 g/mol = 0.16 mol NaCl

In 0.16 moles of NaCl there are 0.16 moles of sodium as well.

We now convert 0.16 moles of sodium into grams, using sodium's molar mass:

0.16 mol * 23 g/mol = 3.68 g

Answer:

as acid is added, the pH of a solution decreases and the hydronium acid concentration increases.

Explanation:

the pH & hydronium ion concentration of solution are inversely related by the equation pH=-log(H+).

Acids are hydronium donors, so when we add an acid to a solution, the hydronium in it will decrease.

Using the above equation, we can see that the more hydronium is added, the less the pH will be since there's a negative sign.

Answer:

6 g of O₂

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2ZnS + 3O₂ —> 2ZnO + 2SO₂

From the balanced equation above,

2 moles of ZnS reacted with 3 moles of O₂.

Next, we shall determine the number of mole of O₂ required to react with 0.125 mole of ZnS. This can be obtained as follow:

From the balanced equation above,

2 moles of ZnS reacted with 3 moles of O₂.

Therefore, 0.125 mole of ZnS will react with = (0.125 × 3)/2 = 0.1875 mole of O₂.

Thus, 0.1875 mole of O₂ is needed for the reaction.

Finally, we shall determine the mass of 0.1875 mole of O₂. This can be obtained as follow:

Mole of O₂ = 0.1875 mole

Molar mass of O₂ = 2 × 16 = 32 g/mol

Mass of O₂ =?

Mass = mole × molar mass

Mass of O₂ = 0.1875 × 32

Mass of O₂ = 6 g

Therefore, 6 g of O₂ is required for the reaction.

Answer:

=64.73..

Explanation:

0.750=5L

9.71=x

0.750*x÷0.750=5L*9.71÷0.750

x=48.55÷0.750

x=64.73..

Respuesta:

3000 ft

914.4 m

9.144 × 10⁴ cm

Explicación:

Paso 1: Información provista

Longitud: 1000 yd

Paso 2: Convertir 1000 yd a pies (ft)

Usaremos el factor de conversion 1 yd = 3 ft.

1000 yd × 3 ft/1 yd = 3000 ft

Paso 3: Convertir 1000 yd a metros (m)

Usaremos el factor de conversion 1 yd = 0.9144 m.

1000 yd × 0.9144 m/1 yd = 914.4 m

Paso 4: Convertir 914.4 m a centimetros (cm)

Usaremos el factor de conversion 1 m  = 100 cm.

914.4 m × 100 cm/ 1 m = 9.144 × 10⁴ cm

Answer:

Explanation:

Element       Electron configuration  Valence electron      Ion

                    for atom                          configuration

P               1s²2s²2p⁶3s²3p³             3s²3p³                        P⁵⁺

Sn           1s²2s²2p⁶3s²3p⁶4s²

               3d¹⁰4p⁶4d¹⁰5s²5p²           5s²5p²                       Sn⁴⁺      

Ni             1s²2s²2p⁶3s²3p⁶4s²         4s²3d⁸                       Ni²⁺

               3d⁸

Br             1s²2s²2p⁶3s²3p⁶4s²        4s²4d⁵                         Br⁻

                3d¹⁰4p⁵

O              1s²2s²2p⁴                         2s²2p⁶                        O²⁻

An atom's electron configuration is a depiction of the distribution of electrons amongst the orbital shells as well as subshells. The electron configuration is frequently used to define an atom's orbitals in its ground state, but it may also be used to depict an atom which has ionized into a negatively charged ion or positively charge ion by accounting for electron loss or gain in succeeding orbitals. Many of an element's physical and chemical features can be linked to its distinct electron configuration. The distinctive chemistry of the element is determined by the valence electrons, which are electrons in the outermost shell.

Answer:

The equilibrium position shifts to the right, in accordance to the constraint principle

Answer:

3 M

Explanation: 1.5mol/.5L = 3M

Answer:

A rabbits respiration should be 30-60 breaths per minute

Answer:

The correct answer is -749.437 Kilojoules

Explanation:

In the case of nutrition, Kcal and cal are equal and each macromolecule produces a specific amount of energy in terms of calories. Carbohydrates and protein generate 4 kcal whereas fat generates 9 kcal per gram.

1 g of carbohydrate = 4 kcal

so, 2 gram of carbohydrate = 8 kcal

9 g of protein = 9*4

= 36 kcal

15 g of fat = 15*9

= 135 kcal

in total = 135 + 36 + 8 kcal

= 179 kcal

and, one kcal =  4.186798 kJ

so 179 kcal = 4.186798 * 179

= 749.437 Kilojoules

Answer:

3.16x10²⁵ molecules

Explanation:

1 mol refers to the amount of a substance. The amount of C₂H₆ molecules (or any other substance) that are in one mol is given by Avogadro's number:

With that in mind we can calculate how many molecules are there in 52.5 moles:

Answer:

You manage to find a bottle of bromothymol blue and a few extra beakers. You take one of the empty beakers and add some of the first unlabeled solution and some indicator.

The color changes to yellow.

You then add some solution from the other unlabeled flask into this beaker and see the color change to blue.

What are the identities of each unlabeled solution?

Explanation:

Bromothymol blue is a dye and it is used as an indicator.

It is used as a pH indicator.

In acids, it becomes yellow n in color.

In bases, it turns blue.

You take one of the empty beakers and add some of the first unlabeled solution and some indicator. The color changes to yellow.

That means the unlabeled solution is an acid.

You then add some solution from the other unlabeled flask into this beaker and see the color change to blue.

It is a basic solution.

Answer:

Definitely A.

Explanation:

very hot...................

Answer:

18.6% by mass MtOH

Explanation:

Solution composition = 200ml MtOH + 693.1 ml H₂O

= (200ml MtOH)(0.792g MtOH/ml MtOH) + (693.1 ml H₂O)(1.000g H₂O/ 1 ml  H₂O)

= 158.4 g MtOH + 693.1 g H₂O = 851.5 g

mass% MtOH = (158.4g MtOH/851.5g Solution) x 100% = 18.6% by mass MtOH

Mars is the fourth planet.

Earth is the third planet.

Both revolve around the Sun.

Both are rocky planets.

Earth is habitable for carbon based life forms.

Mars is not habitable for carbon based life forms.

Answer:

[tex]\%X=2.34*10^{-14}\%[/tex]

Explanation:

From the question we are told that:

Mass [tex]M=2.5g[/tex]

Charge [tex]q=4*0*10^{-9}[/tex]

Generally the equation for Total number of Atoms in Penny is mathematically given by

 [tex]T_a=\frac{Mass}{atomic weight}*1mole[/tex]

 [tex]T_a=\frac{2.5}{63.6}*6.02*10^{23}[/tex]

 [tex]T_a=2.34*10^{27}atoms[/tex]

Since Number of electrons in a penny is

 [tex]e =nT_a[/tex]

 [tex]e=29*2.34*10^{27}[/tex]

 [tex]e=6.86*10^{23}[/tex]

Therefore

The percentage of the atoms are ionized by this charging process is given as

 [tex]\%X=\frac{T_a}{e}[/tex]

 [tex]\%X=\frac{2.34*10^{27}}{6.86*10^{23}}[/tex]

 [tex]\%X=2.34*10^{-14}\%[/tex]

Answer:

See explanation and image attached

Explanation:

2‑methylhept‑3‑yne can be made by the reaction of the compound shown in the image attached with soidamide in liquid ammonia and 1‑bromopropane.

The first step in the reaction is the deprotonation of the alkyne starting material by the amide ion.

This step is followed a nucleophilic substitution reaction of the alkyne with 1‑bromopropane to yield the 2‑methylhept‑3‑yne product.

Answer:

ITS UPSIDE DOWN I CANT ANSWER IT

i will edit the answer if its normal

Explanation:

Answer:

It's sunset because the sun sets in the west and rises in the east. The shadow is going west therefore the sun must be in the east. Also the shadow is super long meaning the sun has to be close to the horizon.

Explanation:

Answer:

Following are the responses to the given choices:

Explanation:

For point a:

Using the acid and base which are strong so,

moles of [tex]H^+[/tex] (from[tex]HNO_3[/tex])

[tex]= 24.9\ mL \times 0.100\ M \\\\= \frac{24.9}{1000\ L} \times 0.100\ M \\\\= 2.49 \times 10^{-3} \ mol[/tex]

moles of [tex]OH^{-}[/tex] (from [tex]KOH[/tex])

[tex]= 25.0\ mL \times 0.100\ M \\\\= \frac{25.0}{1000 \ L} \times 0.100 \ M \\\\\= 2.50 \times 10^{-3}\ mol[/tex]  

[tex]1\ mol H^{+} \ neutralizes\ 1\ mol\ of\ OH^{-}[/tex]

So,  [tex](2.50 \times 10^{-3} mol - 2.49 \times 10^{-3} mol)[/tex] i.e. [tex]1 \times 10^{-5}[/tex] mol of [tex]OH^-[/tex] in excess in total volume [tex](24.9+25.0) \ mL = 49.9 \ mL[/tex] i.e. concentration of [tex]OH^- = 2 \times 10^{-4}\ M[/tex]

[tex]p[OH^{-}] = -\log [OH^{-}] = -\log [2 \times 10^{-4}\ mol] = 3.70[/tex]

Since, [tex]pH + pOH = 14,[/tex]

so,

[tex]\to pH = 14- pOH = 14- 3.70 = 10.30[/tex]  

For point b:

moles of [tex]OH^-[/tex] = from point a [tex]= 2.50 \times 10^{-3} \ mol[/tex]

moles of [tex]H^+[/tex](from[tex]HNO_3[/tex]):

[tex]= 25.1 mL \times 0.100 M\\\\ = \frac{25.1}{1000}\ L \times 0.100 \ M\\\\ = 2.51\times 10^{-3} \ mol[/tex]

1 mol [tex]H^+[/tex] neutralizes 1 mol of [tex]OH^-[/tex]

So, [tex](2.51 \times 10^{-3}\ mol - 2.50 \times 10^{-3}\ mol)[/tex] i.e. [tex]1 \times 10^{-5} \ mol \ of\ H^+[/tex] in excess in the total volume of [tex](25.1+25.0) \ mL = 50.1\ mL[/tex] i.e. concentration of[tex]H^+ = 2 \times 10^{-4}\ M[/tex]

Hence, [tex]pH = -\log [H^+] = -\log[2 \times 10^{-4}] = 3.70[/tex]

Answer:

(A). Immmiscible

Liquid/Liquid extraction is a solvent extraction in which two immiscible liquids move in opposite directions are in continuous contact with each other.

Explanation:

A liquid/liquid extraction is a method used to separate mixtures based on relative solubilities in two immiscible liquids, i.e., liquids that do not dissolve in each other but rather form separate layers when placed in the same glassware.

The immiscibility of the liquids is as a result of the two liquids having different polarities. One liquid is polar while the other is non polar, usually water which is polar and an organic solvent which is non-polar. The most common pair of extraction solvents used is diethyl ether or simply ether and water. They separate into layers and the position most each solvent in either the bottom or top layer is determined by its density. Ether is always found on the top layer while water is found innthe bottom layer because ether is less than than water. The density of ether is 0.713 g/cm3 and the density of H2O is 1.0 g/cm3.

The compound to be extracted dissolves into either of the layers based on the principle that like dissolves like. Polar compounds will dissolve into the water layer while organic nor non-polar compounds will dissolve in the ether layer. The compound is the extracted from either of the layer it is dissolved in.