which of the following reaction would result in a decrease in entropy?

Explanation:

pottassium  its one of covalent bond

Answer:

C. It cannot be physically broken down into different types of atoms.

Answer:

7.0625

Explanation:

The trapezoidal rule ( this is an approximation ) tells you that the average of the left and right endpoints should be as follows,

[tex]\int _a^bf\left(x\right)dx\:\approx \frac{\Delta \:x}{2}\left(f\left(x_0\right)+2f\left(x_1\right)+...+2f\left(x_{n-1}\right)+f\left(x_n\right)\right)[/tex]

where [tex]\Delta \:x\:=\:\frac{b-a}{n}[/tex] ... at this point we can apply the Riemann Formula, in order to divide the interval 0 ≤ x ≤ 2 into n = 4 subintervals of length [tex]\:\Delta x=\frac{1}{2}\:[/tex].

[tex]x_0=0,\:x_1=\frac{1}{2},\:x_2=1,\:x_3=\frac{3}{2},\:x_4=2[/tex] ,

[tex]\frac{\Delta x}{2}=\frac{\frac{1}{2}}{2}=\frac{1}{4}[/tex]

= [tex]\frac{1}{4}\left(f\left(x_0\right)+2f\left(x_1\right)+2f\left(x_2\right)+2f\left(x_3\right)+f\left(x_4\right)\right)[/tex] - Let's calculate the sub intervals for each, substituting to receive our solution.

[tex]f\left(x_0\right)= 0[/tex] ( this is as 0⁴ is 0 )

[tex]2f\left(x_1\right)= 1/8[/tex] ( this is as [tex]2\left(\frac{1}{2}\right)^4=1/8[/tex] )

[tex]2f\left(x_2\right)=2[/tex] ( 2 [tex]*[/tex] 1⁴ is 2 )

[tex]2f\left(x_3\right)= 81/8[/tex] ( this is as [tex]2\left(\frac{3}{2}\right)^4 = 81/8[/tex] )

And finally [tex]f\left(x_4\right) = 16[/tex], as 2⁴ is 16. Therefore, let us plug in our solutions for each into the primary expression, and solve,

[tex]\frac{1}{4}\left(0+\frac{1}{8}+2+\frac{81}{8}+16\right)[/tex] = 7.0625 - this is our solution. The correct answer is option c, and i hope this clarifies why.

Answer:

Theoretical yield: 2.75g of paranitroaniline

Percentage yield: 54.5%

Explanation:

In strong-acid medium, acetanilide (Molar mass: 135.16g/mol) reacts producing para-nitroaniline (138.12g/mol) in a 1/1 reaction.

Theoretical yield of para-nitroaniline is the mass produced assuming a yield of 100%. That is:

2.7g acetanilide × (1mol / 135.16g) = 0.020 moles of acetanilide.

Assuming a yield of 100% are 0.020 moles of paranitroaniline. Theoretical yield is:

0.020 moles × (138.12g / mol) =

Percentage yield is:

(Actual yield / theoretical yield) × 100

Actual yield was 1.5g and percentage yield will be:

Percentage yield: (1.5g / 2.75g) × 100

Answer:

Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems.

Hope this helps.

Answer:

The person above me was right.

"Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems."

Explanation:

Answer:

kl

Explanation:

According to the concept of solubility and electrolysis , KI would form an electrolytic solution in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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The postulation of the law of multiple proportions tells us that; Choice B. nitrogen combines with oxygen in small whole number mass ratios.

Law of multiple proportions states that if two elements form more than one compound, then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.

On this note, nitrogen combines with oxygen in small whole number mass ratios.

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Answer:

electrons move around the nucleus in fixed orbits of equal amounts of energy

Explanation:

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option B.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

According to Bohr’s atomic model,  electrons move around the nucleus in fixed orbits of increasing levels of energy.

Therefore, the correct option is option B that is electrons move around the nucleus in fixed orbits of increasing levels of energy.

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Answer:

Option A. 416.1 g.

Explanation:

Data obtained from the question include the following:

Molarity = 1.743 M

Volume = 1.4957 L

Mass of CuSO4 =..?

Next, we shall determine mole of CuSO4 present in the solution.

This is illustrated below:

Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:

Molarity = mole /Volume

With the above formula, we can obtain the mole CuSO4 present in the solution as follow:

Molarity = 1.743 M

Volume = 1.4957 L

Mole of CuSO4 =..?

Molarity = mole /Volume

1.743 = mole of CuSO4 /1.4957

Cross multiply

Mole of CuSO4 = 1.743 x 1.4957

Mole of CuSO4 = 2.607 moles

Finally, we shall convert 2.607 moles of CuSO4 to grams.

This can be obtained as follow:

Molar mass of CuSO4 = 63.55 + 32.06 + (16x4) = 159.61 g/m

Mole of CuSO4 = 2.607 moles

Mass of CuSO4 =..?

Mole = mass /molar mass

2.607 = mass of CuSO4 /159.61

Cross multiply

Mass of CuSO4 = 2.607 x 159.61

Mass of CuSO4 = 416.1 g

Therefore, 416.1 g of CuSO4 is needed to prepare the solution.

Answer:25.7

Explanation:

Answer:

P.A.S.S

pull, aim, squeeze, sweep.

hope this answer correct (^^)..

Answer:

The proper way of using an extinguisher is:

pull, aim, squeeze and sweep.

Explanation:

P-pull

A-aim

S-squeeze

S-sweep

You can always use this to remember, okay.

Hope it helps.

Answer: 38.52 moles of hydrogen will be required to produce 19.26 mol of methane

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} CH_4=19.26moles[/tex]

The balanced chemical reaction is:

[tex]C+2H_2\rightarrow CH_4[/tex]

According to stoichiometry :

1 mole of [tex]CH_4[/tex] is produced by =  2 moles of [tex]H_2[/tex]

Thus 19.26 moles of [tex]CH_4[/tex] will be produced by =[tex]\frac{2}{1}\times 19.26=38.52moles[/tex]  of [tex]H_2[/tex]

Thus 38.52 moles of hydrogen will be required to produce 19.26 mol of methane

Answer:

Not enough exercise, not enough water, not a healthy diet. Consume fluids regularly during exercise, and drink 16 ounces of fluid for every pound lost during your workout.

Explanation:

Answer:

C

Explanation:

Rate = k(A)m(B)n

The correct option is C.

What are K , m and N in the rate law equation?

The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants.The exponents m and n are the reaction orders and are typically positive integers, though they can be fractions, negative, or zero.

What do you mean by concentrations of reactants?

The increase in the concentration of reactants, the rate of reaction increases. Ions and molecules interact to form a new compound on increasing the concentration.

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Answer:

Para otros usos de este término, véase Resistencia.

La resistencia antibiótica es la capacidad de un microorganismo para resistir los efectos de un antibiótico. La resistencia se produce naturalmente por selección natural a través de mutaciones producidas por azar. El antibiótico, al entrar en contacto con una población bacteriana, permite solo la proliferación de aquellas bacterias que presentan aquella mutación natural que anula la acción del antibiótico. Una vez que se genera la información genética, las bacterias pueden transmitir los nuevos genes a través de transferencia horizontal (entre individuos) por intercambio de plásmidos; o igualmente producto de una conversión lisogénica. Si una bacteria porta varios genes de resistencia, se le denomina multirresistente o, informalmente, superbacteria.

Answer:

since that's the closest option we have

10.6atm

Explanation:

Since volume is constant

P1/T1 = P2/T1

P1 =8.5atm

T1 = 59.2°C = 332.2k

T2 = 140°C = 413k

P2 = ?

8.5/332.2 = P2/413

0.026 = P2/413

P2 = 0.026 x 413

P2 = 10.74atm

Answer:

a) equilibrium shifts towards the right

b) equilibrium shifts towards the right

c) equilibrium shifts towards the left

d) has no effect on equilibrium position

e) has no effect on equilibrium position

Explanation:

A reversible reaction may attain equilibrium in a closed system. A chemical system is said to be in a state of dynamic equilibrium when the rate of forward reaction is equal to the rate of reaction.

According to Le Chateliers principle, when a constraint such as a change in temperature, pressure, volume or concentration is imposed upon a system in equilibrium, the equilibrium position shifts in such a way as to annul the constraint.

When the concentration of reactants is increased, the equilibrium position is shifted towards the right hand side and more products are formed. For an endothermic reaction, the reverse reaction is favoured by a decrease in temperature. Increase in pressure has no effect on the system since there are equal volumes on both sides of the reaction equation. Similarly, the addition of a catalyst has no effect on the equilibrium position since it speeds up both the forward and reverse reactions to the same extent.

Answer:

BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O

Explanation:

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.  

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:

Left side: 1 Br, 5 O and 1 N

Right side: 1 Br, 3 O and 1 N

If the reaction occurs in an acidic medium:

So, balancing the oxygen:

BrO₃⁻ (aq) + NO₂(aq) → Br⁻(aq) + NO₃⁻ + 2 H₂O

Left side: 1 Br, 5 O and 1 N

Right side: 1 Br, 5 O, 1 N and 4 H

Then, balancing the hydrogens:

BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O

Left side: 1 Br, 5 O, 1 N and 4 H

Right side: 1 Br, 5 O, 1 N and 4 H

You can see that you have the same amount on each side of the reaction. So the reaction is balanced.

Answer:

The atom with the highest mass with 139 protons and 154 neutrons, is atom 3

Explanation:

The information given are;

The number of protons, p, the number of electrons, e, and the number of neutrons, n, we have;

p,                               e,                       n,        

39,                             39,                     52

40,                             40                     50

139,                            39                     154

40,                              39                     51

Based on the information that the mass of the proton = 1.67262 × 10⁻²⁷ kg

The mass of the electron  = 1.094 × 10⁻³¹ kg

the mass of the neutron = 1.674927471 × 10⁻²⁷ kg

We have that the atom with the most number of neutron and proton which is atom 3, has the highest mass

we have

Group 8 in the periodic table contains the lightest ferromagnetic element. Therefore, option B is correct.

Ferromagnetism can be described as a property of certain materials that results in a large observed magnetic permeability and large magnetic coercivity to form a permanent magnet.

Ferromagnetic materials are metals attracted to a magnet, a consequence of large magnetic permeability. Magnetic permeability can be defined as the induced magnetization of a material because of the presence of an external magnetic field.

A steel plate can acquire a permanent magnetization, which depends not only on the strength of the applied field but varies greatly among ferromagnetic materials.

Ferromagnetism can be described as the strongest type and is responsible for the phenomenon of magnetism in magnets. Substances weakly to magnetic fields with 3 other types of magnetism which are paramagnetism, diamagnetism, and antiferromagnetism.

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Answer:

Increase energy use during reactions

Explanation:

Answer via Educere/ Founder's Education

Increase energy use during reactions. Hence, option D is correct.

An atom is any particle of matter at its most basic level which contains at least one proton.

A reaction with a high atom economy is important in industry because it uses lesser natural resources, produces less waste, and is better for the environment. It is also cheaper to produce and more sustainable.

Increasing energy used during reactions is NOT a reason atom economy is important.

Hence, option D is correct.

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Answer:

0.963

Explanation:

pH is the potential of hydrogen that can be determined by the hydrogen or hydroxide ion concentration. 10 mL is the amount required of 0.1 M to neutralize.

pH estimates the acidic and the basicity of the solution when a solute is dissolved in the solvent.

Sulfuric acid is dissociated as:

H₂SO₄(aq) ⇌ H⁺(aq) + HSO₄⁻(aq)

pH is calculated as:

pH = -log [H⁺]

[H⁺] = 1x10⁻⁸ M

The moles in 10,000 L is, 10000L × 1x10⁻⁸  = 0.0001 moles

Moles of sulfuric acid required:

0.0001 moles × ( 1 mol H2SO4 ÷ 1 mol H⁺) = 0.001 moles

Further, volume is calculated as:

0.001 ×  (1L ÷ 0.1moles) = 0.01 L

Therefore, 10 mL of 0.1 M acid is needed to neutralize.

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Answer:

The charge - 1

Because the charge of proton is + and electron -

Charge = +49 +(-50)

= - 1

Explanation:

Answer:

the answer is 70.906 g/mol

Explanation:

Answer:

214.12 g

Explanation:

mass = no. of moles x molar mass

molar mass of Cl2 = atomic mass of Cl x 2

= 35.453 x 2

=70.906

so the mass of 3.02 mol Cl2 = 3.02 x 70.906

=214.12 g

Answer:

100kj/mol

Explanation:

Answer:

b

Explanation:

b

The type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.

A covalent bond is a chemical bond between two atoms, ions  or molecules in which electron pairs are shared between elements and covalent bond can also be said as  a molecular bond.

Covalent bonds form or made by  between two non-metallic atoms or compounds with identical or same electronegativity for example hydrogen and oxygen are two non metals and bond to form water molecule.

Therefore, type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.

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Answer:

the answer will be Oa. 2.26

Answer:

The number of moles = 0.06 moles

Explanation:

i) Formula

Number of moles = Mass of the sample ÷ Molar masses of the substances

ii) Number of moles = 10.0 ÷ (137)+(19×2)

= 10.0 ÷ 175

= 0.06 moles

Answer:

0.06moles

Explanation:

I did this question already and I got it right.

Answer:

The correct ans is....

Option B) NH4" and H30*

Explanation:

NH4" and H30* is an example of conjugate pair

Hope this helps....

The acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻

The chemical reaction is

NH₄ + H₂O --> NH₃ + H₃O

An acid-conjugate base pair is a pair that consists of two substances that are different from each other just by the presence or absence of a proton ( H⁺ ) it helps to determine the relative strengths of acids and bases.

Hence we can conclude that the acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻.

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