Iron pieces can be separated from sand using

The question is incomplete, the complete question is:

Consider the reaction:

[tex]2NOCl\rightleftharpoons 2NO+Cl_2[/tex]

At equilibrium, the concentrations are as follows. [NOCl] = 1.4 × 10–2 M [NO] = 1.2 × 10–3 M [Cl2] = 2.2 × 10–3 M What is the value of Keq for the reaction expressed in scientific notation?

A) 1.6 × 10–5

B) 6.2 × 10–4

C) 6.2 × 10+4

D) 1.6 × 10+5

Answer: The correct option is A) [tex]1.6\times 10^{-5}[/tex]

Explanation:

The equilibrium constant is defined as the ratio of the concentration of products to the concentration of reactants raised to the power of the stoichiometric coefficient of each. It is represented by the term [tex]K_{eq}[/tex]

For the given chemical equation:

[tex]2NOCl\rightleftharpoons 2NO+Cl_2[/tex]

The expression for equilibrium constant will be:

[tex]K_{eq}=\frac{[NO]^2}{[Cl_2][NOCl]^2}[/tex]

Given values:

[tex][NO]=1.2\times 10^{-3}M[/tex]

[tex][Cl_2]=2.2\times 10^{-3}M[/tex]

[tex][NOCl]=1.4\times 10^{-2}M[/tex]

Putting values in above expression, we get:

[tex]K_{eq}=\frac{(1.2\times 10^{-3})^2\times (2.2\times 10^{-3})}{(1.4\times 10^{-2})^2}\\\\K_{eq}=1.6\times 10^{-5}[/tex]

Hence, the correct option is A) [tex]1.6\times 10^{-5}[/tex]

Answer: The mass of chlorine gas required is 94.6 mg

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of gold = 0.175 g

Molar mass of gold = 197 g/mol

Plugging values in equation 1:

[tex]\text{Moles of gold}=\frac{0.175g}{197g/mol}=0.000888 mol[/tex]

The given chemical equation follows:

[tex]2Au+3Cl_2\rightarrow 2AuCl_3[/tex]

By the stoichiometry of the reaction:

If 2 moles of gold reacts with 3 moles of chlorine gas

So, 0.000888 moles of gold will react with = of chlorine gas

Molar mass of chlorine gas = 71 g/mol

Plugging values in equation 1:

[tex]\text{Mass of chlorine gas}=(0.001332mol\times 71g/mol)=0.0946g=94.6mg[/tex]       (Conversion factor: 1 g = 1000 mg)

Hence, the mass of chlorine gas required is 94.6 mg

Answer:

Explanation:

This is because,

Chlorine atoms (Cl2) displaces with Bromine atoms (Br) in Sodium bromide (2NaBr) solution to give a result as, Sodium Chloride (2NaCl) and left out atom Bromine (Br)

Answer: The statement, you've just prepared an aqueous solution is true.

Explanation:

When one or more number of substances are dissolved in a solvent like water then solution formed is called an aqueous solution.

For example, when a hot drink is made by dissolving a teaspoon of instant coffee and a teaspoon of sugar in a cup of hot water is an aqueous solution.

Here, both coffee and sugar are solute whereas hot water is the solvent.

Thus, we can conclude that the statement, you've just prepared an aqueous solution is true.

Answer:

28/23

Explanation:

28 : 23

this is written as ,

28/23

u can convert into simplest form but in this question u can't so leave it as it is.

Answer:

= 7.66 x 10²¹  oxygen atoms in 0.364 grams of  CaSO₄·2H₂O

Explanation:

For problems like this posting, one needs an understanding of the following topics:

The definition of the mole

1 mole of substance = mass in grams of substance containing 1 Avogadro's Number ( = 6.023 x 10²³ ) of particles of the specified substance. This is generally one formula weight of the substance of interest. From this, the following equivalent relationships should be memorized:

  1 mole = 1 formula weight = 1 mole weight (g)= 6.023 x 10²³ particles

Converting grams to moles:

Given grams => moles = grams/gram formula wt

Converting moles to grams:

Given moles => grams = moles x gram formula wt

_________________________________________________________

Calculate the number of O atoms in 0.364 g of CaSO₄ · 2H₂O.

Given mass CaSO₄ · 2H₂O = 0.364 grams

Formula Wt CaSO₄ · 2H₂O = 172 g/mole

moles CaSO₄ · 2H₂O = mass CaSO4 · 2H2O / formula Wt. CaSO₄ · 2H₂O

= 0.364 g CaSO₄·2H₂O / 172 g CaSO4·2H2O

= (0.364/172) mole CaSO₄·2H₂O

= 2.12 x 10⁻³ mole CaSO₄·2H₂O    

∴ number of Oxy (O) atoms in 0.364 grams CaSO₄·2H₂O

=  (2.12 x 10⁻³ mole CaSO₄ · 2H₂O)(6.023 x 10²³ molecules CaSO₄· 2H₂O/ mole)

= 1.276876 x 10²¹molecules CaSO₄· 2H₂O  CaSO₄2H₂O

= 1.276876 x 10²¹ molecules CaSO₄· 2H₂O   x   6 oxygen atoms / molecule

= 7.661256 x 10²¹  oxygen atoms in 0.364 grams of  CaSO₄·2H₂O

= 7.66 x 10²¹  oxygen atoms in 0.364 grams of  CaSO₄·2H₂O

Answer:

This question is incomplete, the gravitational potential energy is 2.65 x 10^5 J

mass of the boulder = 866.7g

Explanation:

Potential energy (P.E) refers to the energy due to the position of a body. It can be calculated as follows:

P.E = m × g × h

Where;

m = mass of substance (g)

g = acceleration due to gravity (m/s²)

h = height (m)

According to the information provided in this question,

h = 31.2 m

g = 9.8m/s²

m = ?

P.E = 2.65 x 10^5 J

Using P.E = m × g × h

2.65 x 10^5 = m × 9.8 × 31.2

2.65 x 10^5 = 305.76m

265000 = 305.76m

m = 265000 ÷ 305.76

m = 866.69

mass of the boulder = 866.7g

Answer:

NH2S4. . ...............................,..

Answer:

La respuesta correcta es la opción A.

Explicación:

La densidad del corcho es 0.95g / cm3 por lo que se hundirá en la solución de acetona porque el corcho es más denso que la solución de acetona mientras que por otro lado, el corcho flotará en otros dos líquidos porque la densidad del corcho es menor que en otros dos líquidos o, en otras palabras, los dos líquidos son más densos que el corcho, por eso el corcho flotará en estos dos líquidos.

Answer:

non-conductors of electricity.

Explanation:

One of the auxiliary pleasures of drinking tea is selecting accoutrements: utensils, cups, kettles, storage tins, and, of course, teapots. The choices are legion with a dazzling array of shapes, sizes, decorative touches. Sometimes that blinds us to one of the most important decisions we must make in teapot selection: its function!

One of the auxiliary pleasures of drinking tea is selecting accoutrements: utensils, cups, kettles, storage tins, and, of course, teapots. The choices are legion with a dazzling array of shapes, sizes, decorative touches. Sometimes that blinds us to one of the most important decisions we must make in teapot selection: its function!Your teapot-buying decision should be based first and foremost on size (options often go from one to six cups, sometimes larger). The next most important aspects are your personal preference for material (glass, ceramic or porcelain) and whether it will be used for brewing tea or pouring brewed tea. Other important factors include: whether it's easy to hold, pours well, and, of course, fits into your budget. A gigantic Majolica pot, festooned with monkeys and in a brilliant highly-glazed green, may warm your heart; but if when filled with tea it weighs five pounds and holds more than your family can drink, it will probably be better suited for the collector�s shelf than the tea table.

brainly me pls

Answer:

An atom is a particle of matter that uniquely defines a chemical element . An atom consists of cental nucleus that is usually surrounded by one or more electrons. Each electrons is negatively charged.

Hope this helps you! bye

Answer:

H2SO4 + 8HI → H2S + 4I2 + 4H2O

Answer:

Find the chemical formulas of oxides that contain the following composition:

S:50%; C:42,8%; Mn:49,6%; Pb:86,6%

Explanation:

In the given oxide of sulphur,

50%S is present that means remaining 50% is O.

Divide the % with atomic mass:

S                                     O

50/32= 1.5625            50/16=3.125

divide with smallest ratio:

1.5625/1.5625=1              3.125/1.5625=2

Hence, the formula of oxide is [tex]SO_2[/tex].

Similarly:

Carbon is 42.8% means the reamining % will be O that is 57.2%.

C                                                    O

42.8/12=3.575                         57.2/16=3.575

Divide with smallest ratio:

3.575/3.575=1                            3.575/3.575=1

Hence, the formula of oxide is CO.

Mn is 49.6% means the remining is % is O that is 50.4%.

First divide with atmic mass of respective element, then get the smallest ratio.

That gives the mole ratio of each constituent atom.

Mn                                 O

49.6/55.0=0.90            50.4/16=3.15

0.90/0.90=1                   3.15/0.90=3.5

Multiply with two

2                                        7

Hence, the formula becomes:

[tex]Mn_2O_7[/tex]

Pb is 86.6% means ---remaining 13.4% is O.

Pb                                               O

86.6/207 = 0.418 mol                13.4/16=0.85

0.418/0.418=1                               0.85/0.418=2.0

Hence, the formula is:[tex]PbO_2[/tex]  

Answer:

0.017 M

Explanation:

The balanced equation for the reaction is given below:

2H₃PO₄ + 3Ba(OH)₂ ⇌ Ba₃(PO₄)₂ + 6H₂O

From the balanced equation above,

The mole ratio of acid, H₃PO₄ (nₐ) = 2

The mole ratio of base, Ba(OH)₂ (n₆) = 3

Finally, we shall determine the concentration of the phosphoric acid, H₃PO₄. This can be obtained as follow:

Volume of acid, H₃PO₄ (Vₐ) = 125 mL

Volume of base, Ba(OH)₂ (V₆) = 63.7 mL

Concentration of base, Ba(OH)₂ (C₆) = 0.050M

Concentration of acid, H₃PO₄ (Cₐ) =?

CₐVₐ / C₆V₆ = nₐ/n₆

Cₐ × 125 / 0.05 × 63.7 = 2/3

Cₐ × 125 / 3.185 = 2/3

Cross multiply

Cₐ × 125 × 3 = 3.185 × 2

Cₐ × 375 = 6.37

Divide both side by 375

Cₐ = 6.37 / 375

Cₐ = 0.017 M

Thus, the concentration of the phosphoric acid, H₃PO₄ is 0.017 M

Answer:

A

Explanation:

Answer:

i) ciclobutano

ii) 3-etil-4-metil ciclopenteno

Explanation:

Toda la idea de la nomenclatura IUPAC es permitir que la estructura de la sustancia se derive de su nombre y viceversa.

La nomenclatura IUPAC es un sistema universalmente aceptado para nombrar compuestos químicos.

los nombres de los compuestos enumerados son;

i) ciclobutano

ii) 3-etil-4-metil ciclopenteno

Answer:

Hydrogen bonds

Covalent bonds

Van Der Walls Forces

Ionic Bonding

London Dispersion forces

Metallic bonding

Chemical bonds

Answer:

109.7K

Explanation:

Using Charles law equation as follows;

V1/T1 = V2/T2

Where;

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

V1 = 0.67L

V2 = 0.21L

T1 = 350K

T2 = ?

Using the formula above;

0.67/350 = 0.21/T2

0.001914 = 0.21/T2

0.001914T2 = 0.21

T2 = 0.21/0.001914

T2 = 109.7K

Answer:

12d

Explanation:

Answer:

[tex]{ \tt{c). \: replacement}}[/tex]

C) replacement

Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a replacement reaction

Answer:

17. 3,101.922

18. 1.2447441822

19. 288,057.12

20. 0.74497354

Explanation:

When a base dissolves in water it is an alkali and makes an alkaline solution.

...

Litmus.

Red Litmus Blue Litmus

Acidic solution Stays red Turns red

Neutral solution Stays red Stays blue

Alkaline solution Turns blue Stays blue

Answer:

A dono wat is da anser sori man hehe

Answer:

(a).

→ Hydroxyl group.

→ Carbon-carbon double bond. ( alkene )

→ Esters.

(c).

(I). A colourless solution : with bromine atoms on cyclo hexene.

or: A white precipitate due to bromine atoms formed on phenol.

(ii). The purple solution turns colourless due to oxidation of the cyclo hexene.

(iii).

Bubbles of a colourless gas ( hydrogen gas ) formed when sodium reacts with the hydroxyl group to form Sodium oate ions.

(iv). Am not sure about my answer.

(v).

A red dye is formed. ( and azo dye is formed due to benzenediazonium salt reacting with phenol ).

Answer:

For 1: Ionic

For 2: Ions

For 3: Covalent

For 4: Single

For 5: Double

For 6: Polar

Explanation:

An ionic compound is formed when the complete transfer of electrons takes place from one element usually, metals (forming cation) to another element usually, non-metals (forming anions).

Hence, an ionic bond forms when one atom gives up one or more electrons to another atom

An ion is formed when an element loses or gains an electron. Two types of ions are formed which are cations and anions.

Hence, atoms or molecules with a net electric charge due to the loss or gain of one or more electrons are ions.

A covalent bond is defined as the bond which is formed by the sharing of electrons between two atoms.

Hence, a covalent bond involves sharing electron pairs between atoms, also known as a molecular bond.

A single bond is defined as the bond in which 1 bond is present between the two atoms or 1 pair of electrons (two electrons) are shared between the atoms.

Hence, when one pair of electrons is shared between two atoms, a single bond is formed.

A double bond is defined as the bond in which 2 bonds are present between the two atoms or 2 pairs of electrons (four electrons) are shared between the atoms.

Hence, when two pairs of electrons are shared between two atoms, a double bond is formed

A polar bond is defined as the bond where unequal sharing of electrons takes place. This creates a dipole within a molecule.

Hence, a polar bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms.

Answer:

Luster: Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals.8 May 2021

Elements: Oxygen; Carbon

Explanation:

hope it helps

Answer:

Organic molecules are important to living things because life is based on the properties of carbon.

Properties of Carbon

Carbon is an important element because it can form four covalent bonds.

Carbon skeletons can vary in length, branching, and ring structure.

The carbon skeletons contain the functional groups that are involved in biochemical

Explanation:

Hope it helps

Answer:

24

Explanation:

Answer:

El Niño is a climate cycle in the Pacific Ocean with a global impact on weather patterns. The cycle begins when warm water in the western tropical Pacific Ocean shifts eastward along the equator toward the coast of South America. Normally, these warm water pools near Indonesia and the Philippines.

Explanation:

Answer:29.9 or 30

Explanation:

Total, 30.38 grams of chlorine gas can be formed from 50.0 grams of sodium chloride through electrolysis.

To calculate the mass of chlorine that can be formed from 50.0g of sodium chloride (NaCl) through electrolysis, we need to consider the balanced chemical equation for the electrolysis of NaCl;

2 NaCl (aq) → 2 Na (s) + Cl₂ (g)

From the balanced equation, we can see that 2 moles of NaCl produce 1 mole of chlorine gas (Cl₂).

Convert given mass of sodium chloride to moles.

Molar mass of NaCl = 22.99 g/mol (Na) + 35.45 g/mol (Cl)

= 58.44 g/mol

Moles of NaCl = 50.0 g / 58.44 g/mol ≈ 0.856 mol

Calculate moles of chlorine gas formed.

From the balanced equation, 2 moles of NaCl produce 1 mole of Cl₂.

Moles of Cl₂ = 0.856 mol / 2 ≈ 0.428 mol

Convert the moles of chlorine gas to mass.

Molar mass of Cl₂ = 2 × 35.45 g/mol

= 70.90 g/mol

Mass of Cl₂ = 0.428 mol × 70.90 g/mol

≈ 30.38 g

So, approximately 30.38 grams of chlorine gas can be formed from 50.0 grams of sodium chloride through electrolysis.

To know more about chlorine gas here

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