A professor adds Na₂SO₄ to water to facilitate its electrolysis in a lecture demonstration.(a) What is the purpose of the Na₂SO₄?

The sample volume of propane, a component of lp gas at STP, is 37.12L.

The combined gas law combines the principles of Gay-Lussac, Boyle, and Charles.

According to the combined gas equation, P1×V1/T1 = P2×V2/T2

Assuming the gas is an ideal gas will help us solve this problem. We can then apply the combined gas equation, P1×V1/T1 = P2×V2/T2.

Where,

P1 = initial pressure of the gas = 922 torr = 1.213 atm

P2 = final pressure of the gas at STP = 1 atm

V1 = initial volume of the gas = 35.3 L

V2 = at STP final volume of the gas  =?

T1 = initial temperature of the gas = 315 K

T2 = final temperature of the gas at STP = 273 K

By using the following equation and putting the given values, we obtain:

P1×V1/T1 = P2×V2/T2

Hence, V2 = P1×V1×T2 / T1×P2

V2 = 1.213×35.3×273 / 315×760

Therefore, the volume of the gas at STP is, 37.12 L

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Answer:

The tides are the fall and the rise of the sea waves due to the gravitational pull and forces exerted by the Sun and the moon. The two types of tides are spring and neap tides.

Both convey tides during the gravitational pulls because the Sun and the Moon cancel each other's effect.

What is the tide?

The diagram shows the Neap tides, in which the Moon, Sun and the planet is aligned at a 90-degree angle. They are weak tides and are called low tides.

This type of tide takes place in between the 2 spring tides and happens when the moon is at the first and the last quarter. The gravitational forces exerted by the sun and the moon gets cancelled and results in the formation of moderate tides.

.

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Explanation:

ig tht should be the picture u talking about cz i got this question as my project ..

Answer:

0.5cm²

Explanation:

the volume is found by dividing the mass over the density

v=m/d

=7g/14g/cm²

=0.5cm²

i hope this helps

Answer:

\(\boxed {\boxed {\sf 0.5 \ or \ \frac {1}{2} \ cm^3}}\)

Explanation:

We are asked to find the volume of a solid given the density and mass. The formula for density is:

\(d= \frac {m}{v}\)

We know the solid's density is 14 grams per cubic centimeter and the mass is 7 grams.

Substitute the known values into the formula.

\(14 g/cm^3 = \frac{7 \ g}{v}\)

We are solving for the volume of the solid, so we must isolate the variable v. First, cross multiply. Multiply the first numerator by the second denominator, then the first denominator and second numerator.

\(\frac {14 g/cm^3}{1} = \frac{7 \ g}{v}\)

\(14 \ g/cm^3 * v= 7 \ g * 1\)

\(14 \ g/cm^3 * v= 7 \ g\)

Now the variable is being multiplied by 14 grams per cubic centimeters. The inverse operation of multiplication is division, so we divide both sides by 14 g/cm³.

\(\frac {14 \ g/cm^3 * v}{14 \ g/cm^3}= \frac {7 \ g }{14 \ g/cm^3}\)

\(v= \frac {7 \ g }{14 \ g/cm^3}\)

The units of grams cancel.

\(v= \frac {7 }{14 \ cm^3}\)

\(v= \frac {1}{2} \ cm^3\)

The volume of the solid is 1/2 or 0.5 cubic centimeters.

Answer:

It causes no pollution.

It is less durable and very expensive.

Explanation:

Fuel Cell Vehicles are the vehicles which moves by using hydrogen gas to power an electric motor as compared to conventional vehicles that moves by burning of fossil fuels. There is no bad effect on the environment because Fuel Cell Vehicles cause no pollution like conventional vehicles. Due to less durable and very expensive, Fuel Cell Vehicles can't take the place of conventional vehicles because its higher price which is not affordable for the people.

Answer:

fuel cost and availability

vehicle cost and availability

domestic fuel sources

pollution

onboard fuel storage

fuel cell performance

Answer:

The two or more important products are :-

1. 3 methlcycodexene

2. 1 methlylcohexene(2pt)

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Explanation:

Atoms that are isotopes of each other have different numbers of mass number

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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Answer:

(a) 55 kJ of heat are released when 1 mol of reactant A is used;

(b) 110 kJ of heat are released when 2 moles of reactant A are used;

(c) 27.5 kJ of heat are released when 1 mol of reactant B is used;

(d) 55 kJ of heat are released when 2 moles of reactant B are used.

Explanation:

The question requires us to determine the amount of heat released when the given amounts of reactants are used, considering the following balanced chemical equation:

When the enthalpy change for a reaction (or heat of reaction, ΔH) is given in units of energy, such as kilojoules (kJ), and not units of energy per mol (such as kJ/mol), we can consider that ΔH corresponds to the heat absorbed or released for the molar quantities of reactants as given in the balanced chemical equation. In the case given by the question, for example, we can say that 55 kJ of energy are released when 1 mol of A reacts with 2 moles of B.

Therefore, we can use the molar quantitites from the balanced chemical equation as a reference to determine the amount of heat released when different amounts of reactants are used.

Considering the information above, we can calculate:

(a) heat released when 1 mol of A reacts:

Note that 1 mol of A corresponds to the amount of reactant A given by the balanced chemical equation. Therefore, 55kJ of energy are released when 1 mol of A is used.

(b) heat released when 2 moles of A reacts:

Note that 2 moles of A corresponds to the double of the amount of reactant A given by the balanced chemical equation. Thus, we must multply ΔH by 2: 55 kJ x 2 = 110 kJ of energy are released when 2 moles of A are used.

(c) heat released when 1 mol of B reacts:

Note that 1 mol of B corresponds to half of the amount of reactant B given by the balanced chemical equation. Thus, we must divide ΔH by 2: 55 kJ / 2 = 27.5 kJ of energy are released when 1 mol of B is used.

(d) heat released when 2 moles of B reacts:

Note that 2 moles of B corresponds to the amount of reactant B as given by the balanced chemical equation. Therefore, 55 kJ of energy are released when 2 moles of B are used.

Answer:

No because it changes velocity, instead of accelerating

Explanation:

and yes, I am in K12 ツ

Answer:

no

Explanation:

it changes velocity, instead of accelerating

Answer:

Kinetic energy.

Explanation:

The molecular formula of the compound is C1H2.

The molecular formula of a compound can be determined by analyzing its percent composition by mass. The first step is to convert the percent composition by mass to the mass of each element in one mole of the compound.

85.64% C = (85.64 g C/100 g compound) * (1 mole C/12.01 g C) = 7.13 moles C/mole compound

14.36% H = (14.36 g H/100 g compound) * (1 mole H/1.008 g H) = 14.22 moles H/mole compound

The next step is to find the ratio of atoms in the compound by dividing the moles of each element by the smallest moles of any element.

C:H = 7.13 moles C/mole compound : 14.22 moles H/mole compound = 7.13:14.22

To find the molecular formula, we need to divide the moles of each element by the lowest ratio of atoms to obtain the least whole number ratio of atoms in the compound.

C:H = 7.13 moles C/mole compound / 7.13 : 14.22 moles H/mole compound / 7.13 = 1 : 2

Therefore the molecular formula of the compound is C1H2

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Compared to the atomic arrangement of atoms in diamond, the atomic arrangement of atoms in the ultra-light material were option B: spread apart, chaotic, and spongy.

The atomic arrangement of atoms in the ultra-light material described in the question is likely to be different from that of diamond. Diamond is a very hard and rigid material, with a highly ordered and crystalline atomic structure.

In contrast, the ultra-light material is described as being "spread apart, chaotic, and spongy," which suggests that its atomic arrangement is much less organized and more disordered than that of diamond.

Therefore, based on the above, this may be due to the use of a different type of bonding between atoms, or a different arrangement of atoms within the material, which results in a less rigid and more flexible structure.

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Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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By using stoichiometry and considering the molar ratios from the balanced chemical equation, we find that reacting 15.8 g of H2 with excess oxygen will produce 141 g of water. 141 g.option A.

In the balanced chemical equation 2H2 + O2 → 2H2O, it is stated that two moles of hydrogen gas (H2) react with one mole of oxygen gas (O2) to produce two moles of water (H2O). Since the molar mass of water is approximately 18 g/mol, we can calculate the amount of water produced by converting the mass of hydrogen gas to moles and then using the mole ratio from the balanced equation.

To find the moles of hydrogen gas, we divide the given mass (15.8 g) by the molar mass of hydrogen (2 g/mol), which gives us 7.9 moles of H2. According to the balanced equation, each mole of H2 produces two moles of H2O. Therefore, 7.9 moles of H2 will produce 2 * 7.9 = 15.8 moles of H2O.

Finally, we convert the moles of water to grams by multiplying the moles (15.8) by the molar mass of water (18 g/mol), which gives us 284.4 g. However, we need to remember that the given reaction has excess oxygen, meaning all the hydrogen will react. Therefore, the limiting reactant is not hydrogen but oxygen.

Consequently, the amount of water produced will be based on the number of moles of oxygen. Since there is excess oxygen, we can assume that the moles of oxygen consumed are equal to the moles of hydrogen reacted. Therefore, the correct answer is 15.8 moles * 18 g/mol = 141 g.option A.

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Answer:

gain electrons

Explanation:

"atoms gain electrons, they acquire a negative charge "

Answer:

Hmmmmmmmmmmm

Explanation:

I can't see well

Answer:

your welcome

Explanation:

Addition of HCl  leads to te formation of blue CoCl4^2– while the addition of AgNO3 leads to the formation of pink  Co(H2O)6^2+.

Dynamic equilibrium is said to have been attained in a reaction when the rate of forward reaction is equal to the rate of reverse reaction. Now we have the equilibrium as shown in the image attached.

When we add HCl as in trial 1, the equilibrium position is shifted to the left and blue CoCl4^2– is formed. When we add AgNO3, the Cl^- is precipitated out of solution and the equilibrium shifts towards the left to yield pink Co(H2O)6^2+.

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Moles of Allura Red = stock volume x stock concentration

= 5.00/1000 x 1.90 x \(10^{-4}\) = 9.50 x \(10^{-7}\) mol

Volume of diluted solution = 100 mL = 0.100 L

The concentration of diluted solution = moles/volume

= 9.50 x\(10^{-7}\)/0.100 = 9.50 x \(10^{-6}\) M

Dilution is the process of reducing the concentration of a solute in a solution by simply adding more solvent to the solution, eg water. To dilute a solution, add solvent without adding solute. Dilution is the process of adding solvent to a solution to reduce the concentration of solutes.

Concentration is the process of removing solvent from a solution to increase the concentration of solutes in the solution. Dilution is the process of reducing the concentration of a solute in a solution usually by simply mixing the solute with more solvent. Add water to the solution. Diluting a solution means adding solvent without adding solute.

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The basic formula of sugar is CₙH₂ₙOₙ, where "n" represents the number of carbon atoms in the molecule and "2n" represents the number of hydrogen atoms.

"Sugar" is a term used to describe a variety of sweet-tasting, water-soluble compounds that are commonly used as food additives or sweeteners. The most common type of sugar is sucrose, which is a disaccharide composed of glucose and fructose. The chemical formula for sucrose is C₁₂H₂₂O₁₁, which means it contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

Other types of sugars include glucose, fructose, and lactose, which have different molecular formulas but still follow the basic formula of CₙH₂ₙOₙ. Glucose, for example, has the molecular formula C₆H₁₂O₆, which means it contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Sugars are important sources of energy for living organisms, and are commonly found in fruits, vegetables, and other plant-based foods. They are also used as sweeteners in processed foods and beverages, and can be refined from sugar cane, sugar beets, or other sources.

While sugars can provide energy and contribute to the flavor of foods, excessive consumption of added sugars has been linked to a variety of health problems, including obesity, diabetes, and cardiovascular disease. As such, many health experts recommend limiting the intake of added sugars and choosing whole foods that contain natural sugars instead.

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Answer:

It would be false.

Explanation:

Mixtures are basically their own substance or whatever, they basically stay the same.

Answer:

C. C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l), ΔH = –3,536.1 kJ/mol

Explanation:

This equation represents the combustion of C5H12 (pentane) in the presence of oxygen to produce carbon dioxide (CO2) and water (H2O), with a heat change (ΔH) of -3,536.1 kJ/mol.

The mass of sodium chloride : 3.5 g

Given

Reaction :

2.5g of sodium sulphate + 4.5g of barium chloride ⇒ 3.5g of barium sulphate + sodium chloride

Required

The mass of sodium chloride

Solution

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

From the reaction :

mass of reactants = 2.5 g + 4.5 g = 7.0 g

mass of products = 3.5 g + mass of sodium chloride

mass of reactants = mass of products

7.0 g = 3.5 g + mass of sodium chloride

mass of sodium chloride = 7 g - 3.5 g =3.5 g

Answer:

Two objects are in thermal equilibrium if they are in close contact that allows either to gain energy from the other, but nevertheless, no net energy is transferred between them. Even when not in contact, they are in thermal equilibrium if, when they are placed in contact, no net energy is transferred between them.

Explanation:

hope this helps chloe

Answer:

valence electrons

Explanation:

This is because the valence electrons determine if an atom of an element can bond with other elements.

The pH differential between two components of a system. Corrosion is a natural process that occurs when a material, usually a metal, starts to degrade due to the chemical reactions with its environment. The process of corrosion typically involves the flow of electrons between the two components of a system, which are at different pH levels.

This pH differential creates an electrochemical cell that drives the corrosion process. When a system has a pH differential, the more acidic component (lower pH) acts as an anode, while the more alkaline component (higher pH) acts as a cathode. This electrochemical cell causes the flow of electrons from the anode to the cathode, resulting in the oxidation of the anode and the reduction of the cathode. The oxidation process leads to the formation of corrosion products such as rust or oxide layers on the surface of the anode material. To summarize, corrosion occurs when there is a pH differential between two components of a system, leading to the formation of an electrochemical cell that drives the degradation process.

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the appropriate tool for the situation. volume of a cube is graduated cylinder

A popular piece of scientific equipment used to measure the volume of a liquid is a graduated cylinder, sometimes referred to as a measuring cylinder or mixing cylinder. Its form is slender and cylindrical. The measured liquid amount is indicated by each marked line on the graduated cylinder. An item of laboratory equipment known as a measuring cylinder, graduated cylinder, cylinder measurement, or mixing cylinder is used to measure the amount of liquids, chemicals, or solutions during routine lab work. Compared to standard laboratory flasks and beakers, graduated cylinders are more exact and accurate.

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Answer:

Another equation for Newton's second law that is written to solve for mass can be derived by rearranging the original equation:

-> F = ma

Divide both sides of the equation by force:

-> a = m / F

And then rearrange the equation to solve for mass:

-> m = F / a

Final answer:

-> m = F / a