A chemist has a sample of 1.88 M HCl. What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?

can you show the options? i'm pretty sure it's "before"

Answer:

the answer is According to fossil records scallops live before dinosaurs

Explanation:

before

Answer:

Domain

Explanation:

This is because Linnaeus taxonomy is a system of classification which was invented by a swedish Botanist called Carl Linnaeus and it is refered to hierarchy of grouping organisms called taxa. It involve 7 system of classifications and they include Kingdom, Phylum, Class, Order, Family, Genus, and Species.

Answer:

(a) The most acidic compound - oxalic acid

    The least  acidic compound - acetic acid

(b) The most acidic compound - 2,4-dinitrobenzoic acid

   The least acidic compound -  p-bromobenzoic acid

(c) The most acidic compound - benzoic acid

    The least acidic compound - cyclohexanol

Explanation:

(a) Presence of electron donating group decreases the acidity of carboxylic acid. Therefore , acetic acid is least acidic due to methyl group on carbon of          -COOH group.

Oxalic acid is the most acidic compound due to presence of 2 -COOH group.

(b) Presence of electron withdrawing group increases the acidity of benzoic acid. 2,4-dinitrobenzoic acid will be more acidic as it has two strong electronegative substituents ([tex]-NO_2[/tex] group).

p-bromobenzoic acid will be less acidic than p-nitrobenzoic acid beacuse Br is weaker electron withdrawing group than [tex]NO_2[/tex]

(c) pKa value of benzoic acid(4.45) is more than other compounds and cyclohexanol has least pKa value (16).(Since , higher the pKa value , least acidic the compound is )

Answer:

"Conduction from the sun heating the metal slide" is the answer

Explanation:

Answer:·  44 g NaCl Explanation: The problem provides you with the molarity and volume of the target

Explanation:

Answer:

Ai --> Bii

Aii --> Bi

Aiii --> Bv

Aiv --> Biii

Av --> Biv

Explanation:

For Ai, naphthalene sublimes directly from a solid to gas when heated at around 80 degree Celsius.

For Aii, Ozone has a molecular formula of O₃.

For Aiii, weeds are normally considered as "unwanted" plants. Many people may consider using herbicides to clear the weeds in their gardens.

For Aiv, filtration is a physical method for separating solid and liquid from a mixture. A filter paper is normally used, in which the complex structure of the paper only allows fluid to pass through it, but not the solid ones. The solid left behind on the filter paper is called "residue".

For Av, photosynthesis is a chemical reaction that occurs in the leaves of a plant, which produces food for plants to survive. Carbon dioxide, water and light are required for photosynthesis to take place.

Answer:In the LATER stages of development they would have a spine

Explanation:

Answer:

I think D

Explanation:

Your cell phone number and your driver's license number are the numbers of your personal life that are exact.

In this context, an exact number refers to a number that if it undergoes any modification will not refer to the same thing that it referred to before that modification.

For example, my phone number is 12345. This number is exact because it cannot be changed because or else it would cease to be my phone number, that is, if someone wants to call me and writes the number 12346 it is no longer my number.

Addicionally, if my driver's license number is 112233 it is an exact number because if it is modified it would be the number of another driver.

According to the above, options B, C, and E are incorrect because they are inaccurate numbers because if they are modified they all refer to me and they would not change their meaning.

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Answer:

is is the process of combination of two or more small nuclei to form large nucleus having large amount of energy

Answer:

The crystal field stabilization energy for the octahedral ion hexacyanomanganate(III) , if the wavelength of maximum absorption for the ion is 600 nm is - 1987.59kJ/mole

Explanation:

Lets calculate -:

 Crystal field stabilization energy -

                    [tex]E=\frac{hc}{\pi }[/tex]

   where h = planks constant = [tex]6.626\times10^-^3^4 Js[/tex]

             c= velocity of light = [tex]3\times10^8m/second[/tex]

           [tex]\pi =wavelength=600nm=600\times10^-^9m[/tex]

           [tex]E=\frac{6.626\times10^-^3^4\times3\times10^8}{600\times10^-^9}[/tex]

                =[tex]0.033\times10^-^1^6 J/ion[/tex]

              = [tex]0.033\times10^-^1^6\times6.023\times10^2^3[/tex]

             = [tex]0.198759\times10^7 J/mole[/tex]  = [tex]1987.59\times10^3J/mole[/tex]

             = [tex]1987.59kJ/mole[/tex]

 Thus , the crystal field stabilization energy for the octahedral ion hexacyanomanganate(III) is  1987.59kJ/mole  

Answer:

True?

can I have brainiest pls

≡(▔﹏▔)≡

Answer:

The sound waves travel from the outer ear and in through the auditory canal, causing the eardrum, or tympanic membrane, to vibrate. This, in turn, causes the three small bones, known as the ossicles, or the hammer, the anvil and the stirrup, in the middle ear to move.

Answer:

0.1795 M

Explanation:

From the given information:

The equation is:

[tex]\mathbf{HF_{(aq)}+ KOH_{(aq)} \to KF _{(aq)} + H_2O}[/tex]

From the above equation, the reaction will go to completion due to the strong base:

At the equivalence point, moles of acid (HF) will be equal to moles of base (KOH)

[tex]\text{Number of moles = Volume} \times Molarity[/tex]

Thus. since moles of HF = moles of KOH

Then; 0.020 × 0.393 M = 0.02379 × (x) M

(x) M = [tex]\dfrac{0.02 \times 0.393 \ M}{0.02379}[/tex]

(x) = 0.3304 M

Thus, the molarity of KOH = 0.3304 M

Using the balanced neutralization reaction;

moles of HF = moles of KOH = moles of conjugate base = 0.00786 mol

∴

Volume = 0.020 L + 0.02379 L

Volume = 0.04379 L

Volume of the solution =  0.04379 L

Therefore; Molarity = [tex]\dfrac{moles}{volume}[/tex]

Molarity = [tex]\dfrac{0.00786 \ mol}{0.04379 \ L}[/tex]

Molarity = 0.17949 mol/L

= 0.1795 M

After the initial neutralization, the molarity at the equivalence point will be:

"0.17949 mol/L"

According to the question,

→ HF (aq) + KOH (aq) [tex]\rightarrow[/tex] KF (aq) + H₂O

Since, moles of HF = moles of KOH

We know that,

Number of moles = Volume × Molarity

→ 0.020 × 0.393 = 0.02379 × M

By applying cross-multiplication,

The molarity of KOH be:

M = [tex]\frac{0.02\times 0.393}{0.02379}[/tex]

   = [tex]\frac{0.00786}{0.02379}[/tex]

   = 0.3304 M

By using balanced neutralization reaction,

Volume = 0.020 + 0.02379

             = 0.04379 L

hence,

The molarity will be:

= [tex]\frac{Moles}{Volume}[/tex]

By substituting the values,

= [tex]\frac{0.00786}{0.04379}[/tex]

= 0.17949 mol/L

Thus the response above is correct.

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Answer:

Specific heat is defined as the amount of heat needed to raise the temperature by one degree celsius. Therefore, in 1 kg there are 100 grams so, 10 grams equal 0.01 Kg. Thus, calculate the specific heat value as follows. Thus, we can conclude that specific heat of the given metal is 0.5 .

Explanation:

Answer: [tex]Ag^+(aq)+I^-(aq)\rightarrow AgI(s)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The given chemical equation is:

[tex]AgClO_3(aq)+LiI(aq)\rightarrow AgI(s)+LiClO_3(aq)[/tex]

The complete ionic equation is:

[tex]Ag^+(aq)+ClO_3^-(aq)+Li^+(aq)+I^-(aq)\rightarrow AgI(s)+Li^+(aq)+ClO_3^-(aq)[/tex]

The ions which are present on both the sides of the equation are lithium and chlorate ions. and hence are not involved in net ionic equation.

Thus the net ionic equation is:

[tex]Ag^+(aq)+I^-(aq)\rightarrow AgI(s)[/tex]

Answer:

Anyone got the answers

Explanation:

Answer: A

Explanation: just do as I say

Answer:

his is an example of a first-year chemistry question where you must first convert two of the pressures to the units of the third and add them up, per Dalton’s law of additive pressures. There are three possible answers, one for each of the three pressure units.

1 atm = 760 torr …… torr and mm Hg are the same

1 atm = 101.3 kPa

Dalton’s law:

P(total) = P(O2) + P(N2) + P(CO2)

Explanation:

Gases will assume whatever pressure depending on the equation of state of the mixture (in this case) and the volume htey are contained in. That could be the ideal gas law and simple mixing law, If you are quoting the partial pressures which you call simply “the pressure” of each gas, and that these refer to their values in the present mixture, then yes, we would add them up. The pressures are low enough for the ideal gas law to apply provided the temperature is not extremely low as well .

Answer:

Farenheit

Explanation:

STP is used to measure standard temperature and pressure -- it uses Kelvin for temperature, not Farenheit.

Answer:

It says right under here what to do

Explanation

Determine the moles of product produced by dividing the grams of product by the grams per mole of product. You now have calculated the number of moles of every compound used in this reaction. 41.304 g of NaCl ÷ 58.243 g/mol = 0.70917 moles of NaCl.

Answer:

Okay, so basically your first question is asking what parts of everything mean so part A is the atomic number and the atomic number, in this case, the atomic number is 8 and atomic numbers are the number of protons so there are 8 protons, Part B. is the symbol which identifies what it is, O=Oxygen, Part C. is the name, oxygen, Part D. is the atomic mass, you usually round it so it would be 16, the number of protons+neutrons is this number so since we know the number of protons is 8, 16-8=8, therefore giving 8 neutrons, The number of electrons is equal to the number of protons.

After:

Now using this lovely knowledge, find Carbon and neon :)

Answer:

Number of moles of H₂S gas = 0.0183 moles

Note: The question is incomplete. The complete question is given below:

How many moles of hydrogen sulfide H2S are contained in a 327.3 mL bulb at 48.1°C if the pressure is 149.3 kPa?

Explanation:

The following values are given in the question :

Volume of H₂S gas = 327.3 M = 0.3273 L

Temperature of gas = 48.1°C = (273.15 + 48.1) K = 321.25 K

Pressure of gas = 149.3 kPa

1 kPa = 0.00987 atm; 149.3 kPa = 149.3 × 0.00987 atm = 1.474 atm

Molar gas constant, R = 0.0821 liter·atm/mol·K.

number of moles, n = ?

Using PV = nRT

n = PV/RT

n = (0.3273 × 1.474)/(0.0821 × 321.25)

n = 0.0183 moles

Therefore, number of moles of H₂S gas = 0.0183 moles

Answer:

Na+H2O =NaO+ H2

Explanation:

Because nitrogen is one , so it is balanced. And Oxygen is one,it is balanced. And Hydrogen is 2 ,and hence it is also balanced.

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Answer: HSO4-

Explanation:

I hope this helped!

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Answer:

8.42 moles (3 sig. figs.)

Explanation:

Given 5.07 x 10²⁴ atoms of antimony (Sb) => ? moles Sb

1 mole of any substance contains 6.02 x 10²³ particles ( atoms or molecules)

∴ Think in terms of 'how many 6.02 x 10²³'s are in 5.07 x 10²⁴ atoms Sb?

That is => moles Sb = 5.07 x 10²⁴ atoms Sb / 6.02 x 10²³ atoms Sb/mole Sb

= 8.42192691 moles Sb (calculator answer) ≅ 8.42 moles (3 sig. figs.)

Answer:

because of the testicles

Explanation:

Answer:

Answer:

                 2.77 × 10²³ Br Atoms

Solution:

Data Given:

                Mass of CH₂Br₂  =  39.9 g

                M.Mass of CH₂Br₂  =  173.83 g.mol⁻¹

Step 1: Calculate Moles of CH₂Br₂ as,

                Moles  =  Mass ÷ M.Mass

Putting values,

                Moles  =  39.9 g ÷ 173.83 g.mol⁻¹

                Moles  =  0.23 mol

Step 2: Calculate number of CH₂Br₂ Molecules,

As 1 mole of any substance contains 6.022 × 10²³ particles (Avogadro's Number) then the relation for Moles and Number of CH₂Br₂ Molecules can be written as,

        Moles  =  Number of CH₂Br₂ Molecules ÷ 6.022 × 10²³ Molecules.mol⁻¹

Solving for Number of CH₂Br₂ Molecules,

         Number of CH₂Br₂ Molecules  =  Moles × 6.022 × 10²³ Molecules.mol⁻¹

Putting value of moles,

         Number of CH₂Br₂ Molecules  =  0.23 mol × 6.022 × 10²³ Atoms.mol⁻¹

         Number of CH₂Br₂ Molecules  =  1.38 × 10²³ CH₂Br₂ Molecules

Step 3: Calculate Number of Br Atoms:

As,

                              1 Molecule of CH₂Br₂ contains  =  2 Atoms of Br

So,

           1.38 × 10²³  Molecules of CH₂Br₂ will contain  =  X Atoms of Br

Solving for X,

                     X  =  (1.38 × 10²³ CH₂Br₂ × 2 Br) ÷ 1 CH₂Br₂

                      X =  2.77 × 10²³ Br Atoms

Explanation: