what is the missing value​

Answer:

deez

Explanation:

thx

Answer:

Atoms in the equation are already in balance

Explanation:

It's D

Answer:

The effective number of bonds in sulfate ion is 1.5

Explanation:

The number of chemical bonds between two atoms is known as the bond order.

In covalent bonds between two atoms, a single bond has a bond order of one, a double bond has a bond order of two, a triple bond has a bond order of three.

If there are more than two atoms in a molecule, the effective number of bonds can be determined by applying the following steps:

1. Draw the Lewis structure.

2. Count the total number of bonds.

3. Count the number of bond groups between individual atoms.

4. Divide the number of bonds between atoms by the total number of bond groups in the molecule.

For the sulfate ion, the resonance structure is shown in the attachment below. From the structure;

Total number of bonds = (2 × 2) + (2 × 1) = 6

Total number of bond groups = 4

Effective number of bonds = 6/4 = 1.5

Therefore, the effective number of bonds in sulfate ion is 1.5

Answer:

70.98% is the mass percentage of bromine in the original compound

Explanation:

First, we need to convert mass of AgBr to moles with its molar mass (AgBr: 187.77g/mol). Moles of AgBr = Moles of Br. With molar mass of Br-: 79.904g/mol we can find mass of bromide and mass percentage as follows:

0.7514g AgBr * (1mol / 187.77g) = 0.00400 moles AgBr = Moles of Br-

0.00400 moles Br- * (79.904g / mol) = 0.320g Br- in the sample

Mass percentage is:

0.320g Br- / 0.4505g sample * 100

Answer: the focal point

Answer:

Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide:

H2SeO3 + 2 H2S → SeS2 + 3 H2O

Selenium disulfide consists of 8-membered rings. It has an approximate composition of SeS2, with individual rings varying in composition, such as Se4S4 and Se2S6. Selenium disulfide has been used in shampoo as an antidandruff agent, an inhibitor in polymer chemistry, a glass dye, and a reducing agent in fireworks.[15]

Selenium trioxide may be synthesized by dehydrating selenic acid, H2SeO4, which is itself produced by the oxidation of selenium dioxide with hydrogen peroxide:[17]

SeO2 + H2O2 → H2SeO4

Hot, concentrated selenic acid can react with gold to form gold(III) selenate.[18]

Answer:

sharing of electrons between atoms

Answer:

B. honey dissolving in tea

Explanation:

We are given:

The force applied on the poor hamster (F) = 12 N

Acceleration of the poor Hamster (a) = 8 m/s²

Solving for the mass of the Poor Hamster:

From newton's second equation of motion, we know that:

F = ma

replacing the given values

12 = 8 * m

m = 12/8 kg

m = 3/2 kg

The poor Hamster weighs 3/2 kg

Answer:

The metal is most likely Sodium.

Explanation:

Iron is not soft enough to be cut with a knife and will not react violently with water.  When Iron reacts with water it just slowly rusts.

Copper is somewhat malleable, however, does not really react with water and only forms an oxide layer in the air.

Sodium is soft enough to be cut with a knife (I know this because I have worked with it and seen people work with it).  It is also an alkali metal which are known to explode when in water.

Gold is malleable but does not really react with anything and is considered inert.

Answer:

Question 2

5087.9 or 5088

Answer:

the higher the energy tje lower the wavelength

Explanation:

inverse relationship

Answer:

It's an example of an inverse relationship :)

Answer:

0.4

Explanation:

Given parameters:

Mass of NaCl  = 0.564g

Mass of KCl  = 1.52g

Mass of LiCl = 0.857g

Unknown:

Mole fraction of KCl = ?

Solution:

First, find the number of moles of the given species;

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of KCl  = 39 + 35.5 = 74.5g/mol

Molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

Molar mass of LiCl  =  7 + 35.5  = 42.5g/mol

  Number of moles of KCl  = [tex]\frac{1.52}{74.5}[/tex]   = 0.02mol

  Number of moles of NaCl  = [tex]\frac{0.564}{58.5}[/tex]   = 0.0096mol

  Number of moles of LiCl  = [tex]\frac{0.857}{42.5}[/tex]   = 0.02mol

Sum of moles  = 0.02mol + 0.0096mol + 0.02mol  = 0.0496mol  

Mole fraction of KCl  = [tex]\frac{0.02}{0.0496}[/tex]   = 0.4

Answer:

.4

Explanation:

Answer:

.082 M

Explanation:

You just do C1V1=C2V2

The concentration of the potassium bitartrate acid is determined as 0.082 M.

The concentration of the potassium bitartrate acid is calculated as follows;

C1V1 = C2V2

where;

C2 = (C1V1)/(V2)

C2 = (0.055 x 8.2)/(5.5)

C2 = 0.082

Learn more about concentration here: https://brainly.com/question/17206790

#SPJ2

Answer:

because some things have a higher density than other things

Explanation:

Answer:

some things float bc they have air inside of them which makes them rise bc air rises and gravity pulls so theyre working against each other. some things sink bc theyre heavy and gravity is already pulling them down so them being heavy just makes them sink faster. hope this helps!!!

Explanation:

Answer:

oop whats dis

Explanation:

Answer

When magma reaches the surface it is called lava. After lava has cooled it forms solid rock.

Answer:

Volcano

Explanation:

when magma reaches the surface it cools and then magma  will start coming out over and over and over again. Then we have a volcano. hopemthis helps

Answer:

[tex]PO_4^{3-}(aq)+3Ag^+(aq)\rightarrow Ag_3PO_4(s)[/tex]

Explanation:

Hello!

In this case, since the net ionic equation of a chemical reaction shows up the ionic species that result from the simplification of the spectator ions, which are those at both reactants and products sides, we take into account that aqueous species ionize into ions whereas liquid, solid and gas species remain unionized. In such a way, for the reaction of cesium phosphate and silver nitrate we can write the complete molecular equation:

[tex]Cs_3PO_4(aq)+3AgNO_3(aq)\rightarrow Ag_3PO_4(s)+3CsNO_3(aq)[/tex]

Whereas the three aqueous salts are ionized in order to write the following complete ionic equation:

[tex]3Cs^+(aq)+PO_4^{3-}(aq)+3Ag^+(aq)+3NO_3^-(aq)\rightarrow Ag_3PO_4(s)+3Cs^+(aq)+3NO_3^-(aq)[/tex]

In such a way, since the cesium and nitrate ions are the spectator ions because of the aforementioned, the net ionic equation turns out:

[tex]PO_4^{3-}(aq)+3Ag^+(aq)\rightarrow Ag_3PO_4(s)[/tex]

Best regards!

Answer:

KOH  molar mass = 39 + 16 + 1 = 56g

To make 1 L of 1M soln needs 56g KOH

To make 500mL 1M needs 56/2 = 28g

To make 500mL 0.2M needs 28 x 0.2gn:

Answer:

3.58*10^-4kJ

Explanation:

Given

T1=23.0 °C

T2=100.0 °C

c=1.79 J/g·°C

Volume of olive =3 quarts

Converting to liter

1 quart =0.946353 L

3 quarts=x

Cross multiplying

x=0.946353*3

x=2.83L

To mL= 0.0028mL

We are given the density as 0.916 g/mL

Mass= density *volume

Mass= 0.916*0.0028

Mass=0.0026g

We know that the quantity of heat is expressed as

Q=mcΔT

Q=0.0026*1.79(23-100)

Q=0.004654*(77)

Q=0.358J

In kJ we divide 0.36 by 1000

=0.000358358

=3.58*10^-4kJ

Mass C₂H₂ needed : 22.165 g

Reaction

2C₂H₂+ 5O₂ ⇒ 4CO₂ + 2H₂O

75.0 grams of CO₂ , mol CO₂ (MW=44 g/mol) :

[tex]\tt \dfrac{75}{44}=1.705[/tex]

mol C₂H₂ :

[tex]\tt \dfrac{2}{4}\times 1.705=0.8525[/tex]

mass C₂H₂ (MW=26 g/mol) :

[tex]\tt 0.8525\times 26=22.165~g[/tex]

Answer:

what the heck what is that?

Explanation:

Answer:

a. W = 5,708 J, Q = 5,708 J, ΔU = 0 and ΔH = 0.

b. 2,231 J.

Explanation:

Hello!

a. In this case, since this is an isothermal process (constant temperature) it is possible to infer that the work is computed as shown below:

[tex]W=nRTln(\frac{p_1}{p_2} )=1mol*8.314\frac{J}{mol*K}*298.15Kln(\frac{10.bar}{1.0bar} )\\\\W=5708J[/tex]

Now, since this is an isothermal process we know by definition ΔU = 0 and ΔH = 0, therefore the involved heat is:

[tex]Q-W=0\\\\Q=W=5708J[/tex]

b. In this case, since the process is isobaric but goes to the same final volume in part a, we can compute the initial and final volume based on the part a's conditions by using the ideal gas equation:

[tex]V_1=\frac{nRT}{p_1} =\frac{1mol*0.083145\frac{*L}{mol*K}*298.15K}{10.bar} =2.48L\\\\V_2=\frac{nRT}{p_2} =\frac{1mol*0.083145\frac{*L}{mol*K}*298.15K}{1.bar} =24.8L[/tex]

Thus, the work done here is:

[tex]W=p(V_2-V_1)=1bar(24.8L-2.48L)=22.3bar*L*\frac{1x10^5Pa}{1bar} *\frac{1m^3}{1000L} \\\\W=2231J[/tex]

Best regards!

Answer:

15.14×10⁷ g

Explanation:

Given data:

Number of particles of NaCl = 1.56×10³⁰ particles

Mass of sodium chloride = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ particles

1.56×10³⁰ particles × 1 mol / 6.022 × 10²³ particles

0.259 ×10⁷ mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.259 ×10⁷ mol × 58.44 g/mol

Mass = 15.14×10⁷ g

Answer:

Explanation:

Li+H2O..................LiOH+H2

mass of Li=17.8 g

No of moles of Li=17.8/7=2.5

mass of H2O=50.0 g

No of moles of H2O=50.0/18=2.8

limiting reagent is Li so 1 mole of Li produce 1 mole of LiOH therefore 2.5 mole of Li produce 2.5 moles of LiOH now we have to convert it into grams

moles=given mass/molar mass

given mass=moles*molar mass

molar mass of LiOH=24

mass=2.5*24=60 gram

Answer:

Viscosity is the measure of resistance of a fluid to flow. A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. To think of viscosity in everyday terms, the easier a fluid moves, the lower the viscosity

Explanation:

Answer:

5.6 M

Explanation:

Given data:

Mass of C₆H₁₂O₆ = 25 g

Volume of solution = 25 mL (25 mL×1 L/1000 mL=0.025 L)

Molarity of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of C₆H₁₂O₆:

Number of moles = mass/molar mass

Number of moles = 25 g/ 180.16 g/mol

Number of moles = 0.14 mol

Molarity:

M = number of moles / volume in L

M = 0.14 mol/ 0.025 L

M = 5.6 M