2 KClO3(s) 2 KCl(s) + 3 O2(g)According to the equation above, how many moles of potassium chlorate, KClO3, must be decomposed to generate 1.0 L of O2 gas at standard temperature and pressure?

The required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

To determine the required volume flow rate of liquid ethyl alcohol, we need to calculate the fuel flow rate first. Then, we can convert it to volume flow rate.

Given:

Rate of energy release (Q) = 2000 kJ/s

Excess air = 40% (or 0.4)

First, let's calculate the fuel flow rate (m f):

Q = m f × Lower Heating Value (LHV)

The Lower Heating Value (LHV) for ethyl alcohol can be calculated using the enthalpy of vaporization:

LHV = enthalpy of vaporization / molecular weight of fuel

LHV = 42,340 kJ/k mol / 46.07 kg/k mol = 920.11 kJ/kg

Now, we can calculate the fuel flow rate:

m f = Q / LHV

m f = 2000 kJ/s / 920.11 kJ/kg ≈ 2.173 kg/s

Next, let's convert the fuel flow rate to volume flow rate:

Volume flow rate (V f) = m f / density

V f = 2.173 kg/s / 790 kg/m³ = 0.002749 m³/s

Finally, we can convert the volume flow rate to L/min:

V f = 0.002749 m³/s × (1000 L/1 m³) × (60 s/1 min) ≈ 164.9 L/min

Therefore, the required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

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The decay equation to represent the nuclear fission reaction in which an atom of U-235 absorbs a neutron and produces an atom of Sb-123, four neutrons, and an unknown nuclide, X is given below:

²³⁵₉₂U + ¹₀n → ¹²³₅₁Sb + ¹⁰⁹₄₁X + 4 ¹₀n

The nuclide X is Niobium Nb-109.

Nuclear reactions are reactions that involve changes i the nuclear composition of the atom of elements involved in the reaction.

Nuclear reactions are of two types:

Nuclear fission - this involves the splitting of the nucleus of a heavy atom or large atoms into the nucleus of two or more lighter atoms.

Nuclear fusion - this is the process by which the nucleus of a heavy atom is produced as a result of the fusion or combination of the nucleus of atoms of two or more lighter elements.

The given reaction in which an atom of U-235 absorbs a neutron and produces an atom of Sb-123, four neutrons, and an unknown nuclide, X is an example of nuclear fission reaction.

The decay equation to represent this reaction and the other nuclide, X, formed in this reaction is given below:

²³⁵₉₂U + ¹₀n → ¹²³₅₁Sb + ¹⁰⁹₄₁X + 4 ¹₀n

The nuclide X is Niobium Nb-109.

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Dalton's Atomic theory was Atom is an indivisible fundamental particle but Bohrs theory contradict it,

Atoms contain smaller particles: protons, neutrons, and electrons.

1.01 g/ml

Hope this helps :)

A sample of seawater weighs 158 g and has a volume of 156 mL. The density of the seawater is 1.01 g/ml

Density is the mass per unit volume. Density is denoted by rho and the capital letter D. It can be calculated by dividing the mass by volume.

The volume is the space occupied by a three-dimensional object. It can be calculated by mass and density. It is measured in liters. Mass is the total weight of the object. It is denoted by m.

rho = m / V

rho = density

m = mass

V = volume

The given entities sample of seawater. Its weight is given and the volume is also given.

Given the mass of the sample of seawater weighs 158 mL g.

The volume is 156 ml.

Putting the values in the equation

D = 158 / 156 = 1.01 g/ml

Thus, the density of the seawater is 1.01 g/ml.

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Answer:

the red arrow shows that the change in enthalpy is positive

From the energy diagram, it is clear that, the enthalpy of the reaction is positive and it is an endothermic reaction.

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature of the surroundings. In other words, energy is taken in by the reaction from the environment.

During an endothermic reaction, the reactants absorb energy in the form of heat, light, or electricity to break the bonds between their atoms and form new bonds to create products.

The amount of energy absorbed by the reactants is greater than the energy released by the products. This energy difference is usually expressed as the enthalpy change (∆H) of the reaction, which is positive for endothermic reactions.

Here, the energy of products is higher than that of reactants and hence option A is correct.

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Answer:

a. (NH4)2SO3

b. Ca3(PO4)2

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the compounds formed are  (NH\(_4\))\(_2\)SO\(_3\) and Ca\(_3\)(PO\(_4\))\(_2\).

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound formed from NH\(_4\)⁺ and SO\(_3\)²⁻ is (NH\(_4\))\(_2\)SO\(_3\). The compound formed from Ca²⁺ and PO\(_4\)³⁻ is Ca\(_3\)(PO\(_4\))\(_2\).

Therefore, the compounds formed are (NH\(_4\))\(_2\)SO\(_3\) and Ca\(_3\)(PO\(_4\))\(_2\).

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The mass of ammonia that can be produced from the reaction of 74.2 g of N₂ and 14.0 moles of H₂ is 90.1 g.

The mole ratio of the reaction for the production of ammonia is obtained from the balanced equation of the reaction as follows:

Equation of the reaction: N₂ (g) + 3 H₂ (g) → 2 NH₃ (g)

The mole ratio of the reactants nitrogen and hydrogen is 1 : 3

Moles of nitrogen in 74.2 g of nitrogen = 74.2/28

Moles of nitrogen in 74.2 g of nitrogen = 2.65 moles

Moles of hydrogen present = 14.0 moles

The limiting reactant is nitrogen

Mole ratio of nitrogen to ammonia is 1 : 2

Mass of ammonia produced = 2.65 * 2 * 17 g

Mass of ammonia produced =  90.1 g

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(NH4)2SO4 + Ba(NO3)2 → BaSO4 + 2NH4NO3 is  net ionic balanced equations for the reaction that occurs

To balance chemical equations, stoichiometric coefficients for the reactants and products are required. This is important because a chemical equation must follow the rules of conservation of mass and constant proportions, which dictate that the same number of atoms of each element must be avail on two of the reactant and product sides of the equation.

Chemical equations use the relevant chemical formulae to symbolically express the reactants and products of a chemical process. To the left of the sign "," and to the right of the arrow symbol, respectively, is the part of the chemical equation that is on the reactant side.

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Answer:

B

Explanation:

non metals

elements that always gain electrons from other elements(mainly metals) are called non metallic elements. During a reaction all non metallic elements gain or receive electrons and all metals lose or give electrons. The most non metallic elememt is Flourine, meaning that is gains or receive many electrons during a reaction with another metal.

Answer:

I think its cadmium pliz mark brainliest if helpful

Answer: 1/8

The solution is 1 part salt, 5 parts water. This means that there are 6 parts in the solution.

3/4 of 6 is 4.5 . Which means 4.5 of the 6 parts of the solution were removed from the container. 1/6 of 3/4 is .125, which is 1/8th as a fraction.

This means that 1/8th of the solution that was taken out was salt.

I hope this helped & Good Luck <3 !!!

Answer:

Well elements are chemical substances while a compound consists of two or multiple elements put together.

Explanation:

Answer:

Elements

iron,

copper,

silver,

gold,

hydrogen,

carbon,

nitrogen,

and oxygen.

Compounds

Sugar (sucrose - C12H22O11)

Table salt (sodium chloride - NaCl)

Water (H2O)

Carbon dioxide (CO2)

Sodium bicarbonate (baking soda - NaHCO3)

The term rate of reaction, RR, refers to the speed at which the reactants of a chemical reaction are turned into products. A) RR = 0.0047 M/s; B) RR = 0.0038 M/s; C) 0.0019 M/s.

When talking about the rate of reaction we refer to the speed at which a chemical reaction occurs, turning reactants into products.

It can be measured as

The formula to calculate the rate of reaction is the following,

RR = Δ concentration / Δ Time

Where,

In the exposed example, the chemical reaction is

                              NO₂(g) → NO(g) + 12 O₂(g)

So the rate of reaction can be measured according to

Since the collected data was the concentration of NO₂ as a function of time, then the rate of reaction was measured as the speed at which NO₂ was consumed.

A. What is the average rate of the reaction between 10 and 20 s?

Available data

RR = Δ concentration / Δ Time

RR = (0.951 - 0.904) / 20 - 10

RR = 0.074 / 10

RR = 0.0047 M/s

B. What is the average rate of the reaction between 50 and 60 s?

Available data

RR = Δ concentration / Δ Time

RR = (0.778 - 0.740) / 60 - 50

RR = 0.038 / 10

RR = 0.0038 M/s

C. What is the rate of formation of O₂ between 50 and 60 s?

Now, since NO₂ turns into NO and O₂, then

                  RR = Rate of NO₂ consumed = 2x rate of O₂ produced

If RR between 50 and 60 s is 0.0038 M/s, then the rate of formation of O₂ is,

Rate of NO₂ consumed / 2 =  rate of O₂ produced

0.0038 M/s / 2 = rate of O₂ produced

0.0019 M/s = rate of O₂ produced

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Answer:

uhm yes he made her pump go off

Explanation:

Answer:

OD

a scientific journal

Explanation:

Answer:

D ) a scientific journal

Explanation:

Out of these options a scientific journal is the best resource to use to learn about blood cells

The following pairs of pure substances are written in order of increasing vapor pressure are: I. C₂H₆  < C₄H₁₀.

Vapor pressure is the pressure exerted on a liquid from the vapor of the liquid itself. It is also known as equilibrium vapor pressure or saturation vapor pressure and is the pressure at which a liquid and its vapor are in equilibrium. Vapor pressure is an important factor in determining the state of a liquid. It increases as the temperature increases and decreases as the temperature decreases. It is an intensive property, meaning it is independent of the amount of liquid present.

I: C₂H₆  < C₄H₁₀: This is correct. C₂H₆ has a lower molecular weight and thus a lower vapor pressure than C₄H₁₀.

II: NH₃ < PH₃: This is also correct. NH₃ has a higher molecular weight and thus a higher vapor pressure than PH₃.

III: CH₃OCH₃ < CH₃CH₂CH₃: This is incorrect. CH₃OCH₃ has a lower molecular weight and thus a lower vapor pressure than CH₃CH₂CH₃.

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The percent yield of the reaction is approximately 83.28%.

To calculate the percent yield of a reaction, we need to compare the actual yield (experimental yield) with the theoretical yield. The actual yield is the amount of product obtained in the experiment, while the theoretical yield is the maximum amount of product that could be formed based on stoichiometry.

Mass of lead (Pb) = 451.4 g

Mass of lead(II) oxide (PbO) = 342.3 g

1. Calculate the molar masses:

Molar mass of Pb = 207.2 g/mol

Molar mass of PbO = 223.2 g/mol

2. Convert the masses to moles:

Moles of Pb = mass of Pb / molar mass of Pb

Moles of PbO = mass of PbO / molar mass of PbO

3. Determine the stoichiometry of the balanced chemical equation:

2Pb + O₂ → 2PbO

According to the stoichiometry, 2 moles of Pb react with 1 mole of O₂ to form 2 moles of PbO.

4. Calculate the theoretical yield:

Theoretical yield of PbO = Moles of Pb × (2 moles of PbO / 2 moles of Pb)

5. Calculate the percent yield:

Percent yield = (Actual yield / Theoretical yield) × 100%

Using the given masses, the calculations would be as follows:

Moles of Pb = 451.4 g / 207.2 g/mol ≈ 2.18 mol

Moles of PbO = 342.3 g / 223.2 g/mol ≈ 1.53 mol

Theoretical yield of PbO = 2.18 mol × (2 mol PbO / 2 mol Pb) ≈ 2.18 mol

Percent yield = (1.53 mol / 2.18 mol) × 100% ≈ 83.28%

Therefore, the percent yield of the reaction is approximately 83.28%.

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Given metallic chloride formula =MCl3

It belongs to Nitrogen(N) family.

But the condition is that its transition element.

EC given by

\(\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^3\)

\(\\ \sf\longmapsto [Ar]3d^3\)

The molecular formula is C₆H₅MgBr.

The molecular formulation is an expression that defines the number of atoms of each element in a single molecule of a compound. It indicates the actual variety of every atom in a molecule.

39.7458 % C, means 39.7458 of C

⇒  39.7458 of C × 1 mol c/12 g C = 3.31215 mol C/0.55153 = 6 mol C

⇒ 2.77956 g H ×  1 mol H/1 g H = 2.77956 mol H = 5 mol

⇒ 13.4050 g Hg × 1 mol Hg/ 24.305 g Hg = 0.55153 mol Hg = 1 mol Hg

⇒ 44.067 g Br × 1 mo Br/79.904 = 0.55153 mol Hg = 1 mol Br

Empirical formula = ( C₆H₅MgBr)ₓ

Molecular Formula = (181.313g/mol) / 180 g/mol

                            X  = 1

Hence, molecular formula = C₆H₅MgBr

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Ions are formed when atoms lose or gai electron in order to fulfill the octet rule

The glassware that should be used for liquid-liquid extraction is the (d) separatory funnel.

The separatory funnel is specifically designed for this type of extraction process, allowing for the separation of two immiscible liquids based on their density difference.

It has a conical shape with a stopcock at the bottom for easy separation of the layers. The separatory funnel is commonly used in chemistry laboratories for various extraction techniques, including liquid-liquid extraction.

The other options mentioned, such as the Buchner funnel, Dropping funnel, and Short-stem funnel, are not specifically designed for liquid-liquid extraction and may not provide the necessary features and functionality required for this process.

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Answer: 57

Explanation: Because the atom is neutral, it’s #e= Protons + zero charge (for all neutral atoms)

Hence, #e= 57+0=57 electrons

An electrically neutral atom  have  57 protons  so it will be having 57 electrons .

An atom is electrically neutral when  the overall charge of an atom is zero. The atoms are made of three subatomic particles called protons, electrons and neutrons.

Protons are positively charged particles, electrons are negatively charged and neutrons are neutral.

The number of electrons is equal to the number of protons due to which positive and negative charge cancels each other out.

According to the question,

Because the atom is neutral , it’s

Electrons= Protons + zero charge (for all neutral atoms)

Hence,

Electrons= 57+0

=57 electrons

Hence, an electrically neutral atom  have  57 protons  so it will be having 57 electrons .

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Answer: Its true, mental ions and hydrogen ion both have the same type of charge.

Answer:

TRUE, Metal ions, and hydrogen ions both have the same type of charge. Explanation: Metal atoms lose one or more electrons at their maximum energy level and improve positively charged ions. A hydrogen ion is created when a hydrogen atom loses electrons and then becomes positively charged (charge +1).

Answer

b. Oil, water, chloroform.

Explanation

Between water, chloroform, and oil, chloroform is the most dense substance (1.5 g/cm3), followed by water which has a density of 1.0 g/cm3. The least dense substance is oil with density of 0.9 g/cm3. Therefore, the oil will be at the top, followed by water, then chloroform will be at the bottom.

The fluids layered from top to bottom are oil, water and chloroform. Therefore, the correct option is option B.

A fluid is defined as a substance that has the ability to flow and conform to its surroundings. They can be found in both liquids and gases, among other forms. Liquids, like water, have a specified volume but no clear shape, whereas gases, like the air, have neither a specific volume nor shape. We need fluids to survive every day. Since water makes up the majority of the fluid in our bodies, they are essential for our survival. Fluids are also essential in many industrial processes, such as manufacturing, energy production, and transportation.

Therefore, the correct option is option B.

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