How many electrons would be present in the valence shell of a sulfur atom (atomic number 16, mass number 32)

Answer:

0.600 moles has volume 1.200L

Explanation:

The volume is numerically double the moles

0.600 mol occupies 1.200L

Mathematically:

V1/moles1 = V2/moles2

1.200L / moles1 = 0.600L/ 0.300mol

Moles 0.600L = 1.200L * 0.300mol

Moles = 1.2000L *0.300 mol / 0.600L

moles = 0.600 moles.

Answer:

Explanation:

From the given information:

\(2NO_2_{(g)} \to 2N_{2(g)} + O_{2(g)}\)

The above reaction is a zero-order reaction.

The rate constant = 0.0067 M-s⁻¹

Suppose the volume of the flask = 4L

Initial Mol of dinitrogen monoxide = 300 mmol

The final mol of dinitrogen monoxide = 150 mmol

The molarity of dinitrogen monoxide = \(\dfrac{ \text{number of moles of dinitrogen monoxide }}{\text{volume of flask}}\)

\(= \dfrac{300 \ m}{ 4 L}\)

= 0.0075 mmol/L

= 0.0075 L

The final concentration  \(= \dfrac{150 \ m}{ 4 L}\)

= 0.0375 L

By applying zero order equation

\(kt = [A_o] -[At]\)

\((0.0067)(t) = 0.075 - 0.0375\)

\((0.0067)(t) = 0.0375\)

\(\mathbf{t = 5.59 \ seconds}\)

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, due to larger atomic size, francium has lower melting and boiling point than lithium.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Francium has lower melting and boiling point than lithium because of the larger atomic size, due to which  lattice energy becomes low.

Therefore, due to larger atomic size, francium has lower melting and boiling point than lithium.

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Answer:

The law of constant composition states that the proportions of the elements in a compound are always the same, no matter how the compound is made.

Answer: its vein

Explanation:

Answer: It’s blood

Explanation:

I did the quiz

\(pH = - \log[\text{H}^{+}] = -\log \left(1.75 \times 10^{-11} \right) = 10.757\)

1) The calculate rate constant is  9.22 * 10^-5 s-1

2) In the period of  is 15033 s 75% is used up

3) From the calculation, there is an initial 9.22 * 10^-5 M.

In chemistry, the rate of reaction would give the idea that the reaction is proceeding quickly or slowly. If a reaction has a large rate of reaction then it tends to move on to completion.

From the question, it  is clear that there is 25% in t =52 min.

Initial concentration [A]o =  [A]o

Final concentration =  [A]o - 0.25  [A]o = 0.75 [A]o

Time taken = 52 min or 3120 s

From the formula that can be applied to a first order reaction;

ln[A] = -kt + ln[A]0

k = -(ln[A] -  ln[A]0)/t

k = - (ln0.75 [A]o/A]0)/3120

k = 9.22 * 10^-5 s-1

b)

Then we have  to find  the time after the initial concentration decrease with 75%

[A] =  [A]o - 0.75  [A]o = 0.25 [A]o

ln[A] = -kt + ln[A]0

t = -(ln[A] -  ln[A]0)/k

t = - (ln0.25 [A]o/A]0)/9.22 * 10^-5

t = 15033 s

c)  Given that in this case, the initial concentration of the reactant is 2.5 mol/L·s

k = - (ln0.25 (2.5)/ln(2.5))/15033

k = 9.22 * 10^-5 M

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Answer:

"nonmetal, nonmetal"

Explanation:

Oxygen is a non metal and Nitrogen is a non metal. It is 8th element of the periodic table. It is located in period 2 and group 16.

Nitrogen lies at the group 15 of the periodic table. Its atomic no is 7. Its valency is 2.

Hence, the correct option is (c) "nonmetal, nonmetal".

Answer:

She say that im cool

I'm like "yeah thats true"

I believe in G-O-D

Dont believe in T-H-O-T

Explanation:

Answer:

rolling in the deep

Explanation:

Answer:

Copper Copper Copper Copper

\(\displaystyle 1.67 \ mol \ KBr\)

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] 2K + Br₂ → 2KBr

[Given] 1.67 moles K

[Solve] moles KBr

Step 2: Identify Conversions

[RxN] 2 mol K → 2 mol KBr

Step 3: Stoichiometry

\(NADP{{H}_{2}}\) is required for the transformation of oxaloacetic acid into malic acid.

Malic acid is sour and acidic. This helps to clear away dead skin cells when applied to the skin.

The conversion of oxaloacetic acid into malic acid takes place in \(C_4\)plants through the \(C_4\) cycle by the process of photosynthesis.

Carboxylation of pyruvate produces oxaloacetate (OAA). This is an energy-requiring reaction that uses adenosine triphosphate (ATP).

Hence, \(NADP{{H}_{2}}\) is required for the transformation of oxaloacetic acid into malic acid.

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Answer:

Here is the correct order (ascending order):

gene, DNA, chromosome, nucleus, cell, organism.

A gene is a segment of DNA that contains the instructions for building a protein or RNA molecule. DNA is the molecule that carries genetic information and makes up genes. A chromosome is a structure made of DNA and protein that carries genes. A nucleus is a membrane-bound organelle that contains chromosomes. A cell is the smallest structural and functional unit of living organisms, consisting of a nucleus (or nucleoid in prokaryotes) and cytoplasm. An organism is an individual living entity, such as a plant, animal, or bacterium, that consists of multiple cells.

Answer:

kinetic

Explanation:

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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A brother is bragging about doing a bench press of 4000 grams at the gym. 4000 grams is equal to 8.818 pounds.

The bench press or chest press is training or weight training to strengthen your arm and chest muscles. It is done by laying down on a bench and pushing and pulling up the bars with weight.

It is a common weight-lifting exercise in gyms. Trainers use accordingly weight on the basis of the trainee's weight and strength that is doing the bench press, and the weight is measured differently in different countries. Eight-pound is not a very big amount.

In America, weight is measured in pounds, one kg is 1000 grams and

1 gram is 0.00220462

4000 x 0.00220462

4000 grams will be 8.818 pounds.

Thus, 4000 grams is equal to 8.818 pounds.

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The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer:

purity and pressure affects boiling point

Tin metal is mixed with hydrobromic acid, creating a metal within acid situation. Therefore, in this instance, the metal is attempting to replace the hydrogen within it. (For more detail scroll down)

The distance between the hydrogen and halogen atoms increases as the anion's size expands. It gets simpler to release H+ ions from hydracids as we move lower in the halogen group. Therefore, HI>HBr>HCl>HF is the sequence of acid strength.

Since tin is higher up, it will be able displace hydrogen from the acid to create the hydrogen gas. Tin can remove the hydrogen from the solution because it is more dense than hydrogen.

Sn(s) +2 HBr(aq) ----->SnBr2(aq) +H2(g)

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How the oxidation of propan-1-ol can result in the formation of two different products.

(1) With an addition of oxygen , propan--ol can be oxidised to form propanoic acid.

1). by adding alkaline KMnO4 to oxidise propan-1-ol solution.

see equation below:

The value of ΔG°rxn is - 6979 J/mol, and the reaction is spontaneous.

The change in Gibbs free energy (ΔG°rxn) for a reaction can be calculated using the equation;

ΔG°rxn = -RT ln(K)

where; R = gas constant = 8.314 J/mol.K

T = temperature in Kelvin (K)

K = equilibrium constant for the reaction

Given;

K = 17.23

T = 371 K

R = 8.314 J/mol.K

Plugging in the given values into the equation;

ΔG°rxn = - (8.314 J/mol.K) × (371 K) * ln(17.23)

Using a calculator, we can calculate the natural logarithm of 17.23:

ln(17.23) ≈ 2.848

Plugging this value back into the equation;

ΔG°rxn = - (8.314 J/mol.K) × (371 K) × 2.848

ΔG°rxn ≈ - 6979 J/mol

The negative value of ΔG°rxn indicates that the reaction is spontaneous, as ΔG°rxn < 0.

Therefore, the reaction will occur spontaneously in the forward direction at 371 K when the equilibrium constant (K) is 17.23.

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Answer:

3.6106 g/mL (approx.)

Explanation:

Average density = Sum of all densities/ Number of Densities
Which is, (3.5512 + 3.4188 + 3.8617)/3
≈ 3.6106 g/mL

Answer:

Solutions having solvent in solid-state and solute in the gaseous state are called gas-solid solution. Hydrogen is a gas at STP and platinum is solid. Hence, Hydrogen gas adsorbed on the surface of platinum is an example of gas in solid solution.

Answer:

The correct answer is - 15.625

Explanation:

The half-life is the time it takes to decay half value or quantity of its initial quantity or value. It is given that,

The half-life of K-42 = 12.4 hours

The initial value of K-42 = 500 gm

After 62 hours the value of k-42 = ?

The number of half cycle = 62*1/12.4 = 5,

therefore it will have 5 half-lives

initial - 500

1st half life - 500/2 = 250

2nd - half life - 250/2 = 125

3rd half life - 125/2 = 62.5

4th half life - 62/2 = 31.25

fifth half life - 31.25/2 = 15.625

Thus, the correct answer is =15.625g

15.625 g of  a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.

The half-life is the time after which half of the initial quantity of a radioactive substance is left .

Given here,  

The half-life of K-42 = 12.4 hours  

The initial quantity of K-42 = 500 gm  

The final quantity after 62 hours = ?  

The number of half cycle

\(\bold { = 62\times \dfrac 1{12.4} = 5,}\)  

Thus the number of half life cycles in 62 hours is 5,

After 1 half life \(\bold {= \dfrac {500}{2} = 250}\)  

After 2 half lives \(\bold {= \dfrac {250}{2} = 125}\)  

After 3 half lives \(\bold {= \dfrac {125}{2} = 62.5}\)  

After 4 half lives  \(\bold {= \dfrac {62.5}{2} = 31.25}\\\)  

After 5 half lives \(\bold {= \dfrac {31.25}{2} = 12.625}\\\)  

15.625 g of  a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.

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Answer:

Aluminum is the second most abundant metallic element on earth. It has been estimated that 8% of the earth's crust is composed of aluminum, usually found in the bauxite form. On a volume basis, aluminum has become the most widely used non-ferrous metal.

Primary aluminum production is the quantity of primary aluminum produced in a specified period and the quantity of molten or liquid metal tapped from pots that is weighed before transfer to a holding furnace or before further processing.

Explanation:

Answer:

A physical change --> is the change in appearance or form Example --> ice melting.

A chemical change --> is the change in chemical composition. Example --> rust

Additionally, physical changes can be reversible (water melting or freezing), while chemical changes can't. Rust cannot be reversed.

The concentration of mixed solution = 0.5 M

Given

0.5 M H₂SO₄

0.5 M NaOH

Required

The concentration

Solution

Molarity from 2 solutions :

Vm Mm = V₁. M₁ + V₂. M₂  

m = mixed solution

V = volume

M = molarity

V = mixed volume  

1 = solution 1

2 = solution 2

Vm = V₁+V₂

Equal volumes⇒V₁=V₂, and Vm = 2V, then equation becomes :

2V.Mm = V(M₁+M₂)

2V.Mm = V(0.5+0.5)

Mm=0.5 M