Elements in the same period of the periodic table exhibit similar physical and chemical properties.

A voltaic cell is used to produce electrical energy with the help of chemical reactions.

Relating to, or producing direct electric current by chemical action.

A Voltaic Cell (also known as a Galvanic Cell) is an electrochemical cell that uses spontaneous redox reactions to generate electricity. It consists of two separate half-cells.

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Based on the charge on ln, the compounds formed are as follows:

Ionic compounds are compounds formed between two elements who form positive and negative ions and the electrostatic attraction between the oppositely charged ions forms the ionic bond.

The sum of charges in a neutral ionic compound is zero.

ln has a charge of 3+

The compounds formed are as follows

ln3+ + 3NO3- ----> ln(NO3)3

ln3+ + SO3^2- ---> ln2(SO4)3

ln3+ + PO4^3- ---> lnPO4

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Answer:

The balanced chemical equation for the combustion of C2H4 (ethylene) is:

C2H4 + 3 O2 → 2 CO2 + 2 H2O

From the balanced chemical equation, we can see that 1 mole of C2H4 reacts to produce 2 moles of H2O.

First, we need to convert the given mass of C2H4 to moles using its molar mass. The molar mass of C2H4 is:

2(12.01 g/mol) + 4(1.01 g/mol) = 28.05 g/mol

Now, we can calculate the moles of C2H4:

moles of C2H4 = mass of C2H4 / molar mass of C2H4

moles of C2H4 = 16 g / 28.05 g/mol

moles of C2H4 ≈ 0.570 mol (rounded to three decimal places)

According to the balanced chemical equation, 1 mole of C2H4 produces 2 moles of H2O.

moles of H2O = 2 * moles of C2H4

moles of H2O = 2 * 0.570 mol

moles of H2O ≈ 1.140 mol (rounded to three decimal places)

Finally, we can convert the moles of H2O to grams using the molar mass of water (H2O), which is 18.015 g/mol.

mass of H2O = moles of H2O * molar mass of H2O

mass of H2O = 1.140 mol * 18.015 g/mol

mass of H2O ≈ 20.53 g (rounded to two decimal places)

So, approximately 20.53 grams of H2O will be produced by the combustion of 16 grams of C2H4.

Answer:h2so4

Explanation:

Without specific details about Gita's model, it is difficult to determine whether her sister can use it to correctly describe the patterns of the seasons on Earth.

In order to evaluate Gita's model and determine whether her sister can use it to correctly describe the patterns of the seasons on Earth, we need more specific information about the details and accuracy of the model. However, without that information, we can discuss some general aspects to consider when evaluating a model.

Firstly, a model should be based on accurate and relevant data. Gita's model should incorporate scientific data about Earth's axial tilt, its orbit around the sun, and how these factors contribute to the changing seasons. It should also consider other factors that influence seasons, such as the distribution of landmasses, ocean currents, and atmospheric circulation patterns.

Secondly, the model should be logically consistent and able to explain observed phenomena. Gita's model should be able to explain why different parts of the Earth experience different seasons at the same time, why the duration and intensity of seasons vary at different latitudes, and how the position of the sun relative to Earth affects seasonal changes.

Additionally, the model should be able to make accurate predictions and align with empirical evidence. Gita's sister should be able to compare the model's predictions with actual observations of seasonal patterns on Earth and assess how well they match.

It is important to note that accurately describing the patterns of seasons on Earth requires a complex understanding of various interconnected factors. It is unlikely that a simple or incomplete model would be able to fully capture all the intricacies of Earth's seasonal variations. Therefore, Gita's model would need to be comprehensive and supported by scientific knowledge in order for her sister to rely on it for an accurate description of the seasons.

In conclusion, without specific details about Gita's model, it is difficult to determine whether her sister can use it to correctly describe the patterns of the seasons on Earth. It would depend on the accuracy, relevance, logical consistency, and predictive capabilities of the model, as well as its alignment with empirical evidence and scientific understanding of Earth's seasonal variations.

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Answer:b zinc ,d=7.14g/

Explanation:

Answer:

Protein

Explanation:

Answer:

Water, fat, proteins, lactose, and minerals. Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids, and gases.

Answer:

true

Explanation:

I did the quiz and got it right

Answer:

True

Explanation:

Sound waves traveling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air (or any fluid medium), the particles of air do not vibrate in a transverse manner.

Answer:

true

Explanation:

ape x

Answer:A physical property is a characteristic of matter that is not linked to the change in the chemical composition. Examples of physical proerties are: color, boiling point and solubility.

Reactivity is not a physical property.

Answer:

This answer is "True"

If a snail crawls 55 inches per day ,the snail will crawl approximately \(3.2 * 10^3 centimeters.\)

To convert inches to centimeters, we need to use the conversion factor: 1 inch = 2.54 centimeters.

First, let's calculate the distance the snail crawls in inches in 23 days. We can multiply the daily distance by the number of days:

Distance in inches = 55 inches/day × 23 days = 1265 inches.

Now, to convert the distance from inches to centimeters, we multiply the distance in inches by the conversion factor:

Distance in centimeters = 1265 inches × 2.54 cm/inch = 3215.1 cm.

Rounding to the appropriate number of significant figures, the snail will crawl approximately 3215 cm or \(3.2 * 10^3 centimeters.\) in 23 days.

Therefore, the answer is  Option 3:\(3.2 * 10^3 centimeters.\)

This means that in 23 days, the snail will crawl approximately\(3.2 * 10^3 centimeters.\)

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Answer:

A molecule is the smallest particle of a substance that is made up of 2 or more atoms

An atom is the smallest particle of any pure element

An element is a substance that cannot be broken chemical and physical processes

A molecule is known as the building block of matter

A compound is a chemical substance that is made up of 2 more more different atoms bonded together

The equation that relates A and W, considering the desired 15% acetic acid concentration, is 3W = 2.55M.

The equation A = (3/17)W represents the relationship between the mass of acetic acid (A) and the mass of water (W) in the mixture. It states that the mass of acetic acid is equal to three seventeenths (3/17) of the mass of water.

Since the company wants the acetic acid to be 15% of the total mass of the mixture, we can set up another equation to represent this requirement. Let M be the total mass of the mixture. The mass of acetic acid (A) is 15% of the total mass, so we have A = 0.15M.

Now we can substitute A in terms of W from the first equation into the second equation: (3/17)W = 0.15M. We can simplify this equation by multiplying both sides by 17 to get 3W = 2.55M.

This equation allows the company to calculate the mass of water (W) required for a given mass of acetic acid (A) to maintain the desired concentration in the mixture.

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Answer

pOH = 0.60

pH = 13.40

Explanation

Given:

Mass of NaOH = 5 g

Volume of water = 500 mL

What to find:

The pH and pOH of the solution.

Solution:

The first step is to determine the mole of NaOh in 5 g NaOH.

1 mole NaOH = 40 g/mol

So mole of NaOH in 5 g NaOH is

The next step is to determine the molarity of the solution.

Puting mole = 0.125 mol and Volume = 500/1000 = 0.5 L

This implies the hydroxyl ion concentration in the solution is 0.25 M

Using pOH = -log[OH⁻], the pOH can be determine.

pOH = -log(0.25)

pOH = -(-0.6021)

pOH = 0.60

Since pH + pOH = 14, then pH = 14 - pOH

Putting pOH = 0.60

pH = 14 - 0.60

pH = 13.40

Therefore, the pH of the solution = 13.40 and pOH = 0.60

Answer:

C, Movement

Explanation:

Answer:directly to the right

Explanation:

Atomic size increases from left to right

To find an element with a greater atomic number, The student should look ;     Directly to the right ( D )

The atomic number of an element in the periodic table increases across the period ( i.e. when you move from left to right ) while the atomic radius of an element increases as you go down in a group in the periodic table.

Therefore if you want to find an element in the same period that posses a higher atomic number you should move from left to the right of a period in the periodic table.

Hence we can conclude that the to find an element with a greater atomic number the student should look directly to the right.

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Answer:

Explanation:

aluminum

Answer: The aluminum ion

Explanation:

Answer:

1.09

Explanation:

Keep in mind that the volume of the solution changes during this titration, so to compute the amount of hydronium that is neutralized during this addition of base (in order to calculate the final pH of the solution), we must calculate the moles of all species in solution initially present. Because both NaOH and HCl ionize completely:initial mol OH−=mol NaOH=(0.0050 L)(0.10 molL)=0.00050 mol OH−initial mol H3O+=mol HCl=(0.050 L)(0.10 molL)=0.0050 mol H3O+The acid is in excess, so all of the OH− present will neutralize an equivalent amount of H3O+, forming water. Thus we simply subtract the moles of hydroxide from the moles of hydronium in solution to find the resultant moles of H3O+ after this neutralization:final mol H3O+= initial mol H3O+−initial mol OH−final mol H3O+=0.0050 mol−0.00050 mol=0.0045 mol H3O+We now calculate the total volume of the solution by adding the volumes of acid and base initially combined: 0.050 L+0.0050 L=0.055 LTo get [H3O+], we divide the final moles of hydronium by the final solution volume:[H3O+]=final mol H3O+ total volume=0.0045 mol0.055 L≈0.08181molLFinally, to find pH:pH=−log[H3O+]=−log(0.08181)=1.09Since the hydronium concentration is only precise to two significant figures, the logarithm should be rounded to two decimal places.

Answer: 55.5 oC is 0.014 atm (3rd decimal point)

Explanation:

The Clausius-Clapeyron equation is given as:

ln(P2/P1) = -(ΔH_vap/R) * (1/T2 - 1/T1)

where:

P1 = vapor pressure at temperature T1

P2 = vapor pressure at temperature T2

ΔH_vap = enthalpy of vaporization

R = gas constant = 8.314 J/(mol*K)

Converting the enthalpy of vaporization to J/mol:

ΔH_vap = 35.2 kJ/mol = 35,200 J/mol

Converting temperatures to Kelvin:

T1 = 64.7 + 273.15 = 337.85 K

T2 = 55.5 + 273.15 = 328.65 K

Substituting the values into the equation and solving for P2:

ln(P2/1 atm) = -(35,200 J/mol / 8.314 J/(mol*K)) * (1/328.65 K - 1/337.85 K)

ln(P2/1 atm) = -4.231

P2/1 atm = e^(-4.231)

P2 = 0.014 atm

Therefore, the vapor pressure for methanol at 55.5 oC is 0.014 atm, to the third decimal point.

Answer:

\(V=980L\)

Explanation:

Hello,

In this case, we have a concentration that is per unit of deciliters, therefore, we need to convert it to litre basis:

\(3.48\frac{g}{dL} *\frac{1L}{10dL}=0.348\frac{g}{L}\)

Then, to compute the volume we use the given mass to obtain:

\(V=\frac{341g}{0.348g/L}\\ \\V=980L\)

Best regards.

Answer:

The rate constant for the first-order reaction can be calculated by using the equation: k = 0.693 / t1/2. In this case, the half life is 148 minutes, so the rate constant is calculated as 0.0047 per minute. This means that, after 50 minutes have elapsed, the concentration of the reaction should be 1.10M * e^(-0.0047 * 50) = 0.962M.

Answer:

Chemical, electrical, and heat

Explanation:

The heat from the lightbulb and resistance of the wire

Light from the lightbulb

Chemical energy stored in the battery

And electrical due to the electrical current in the circuit.

Explanation:

We have to find the number of mEq in 4.5 L of 0.8 M solution of MgCl₂. First we can find the number of moles of MgCl₂ that are present in that solution.

The molarity can be calculate using the following formula.

molarity of a solution = number of moles of solute/(volume of solution in L)

We already know the concentration of the solution and the volume of solution in liters. So we can find the number of moles of the salt that are present in the solution.

molarity of a solution = moles of MgCl₂/(volume of solution in L)

moles of MgCl₂ = molarity of the solution * volume of solution in L

moles of MgCl₂ = 0.8 M * 4.5 L

moles of MgCl₂ = 3.6 mol

So we found that there are 3.6 mol of MgCl₂ in the solution. Now we have to find the number of Eq or mEq.

The equivalent mass of a salt can be defined like the molecular mass of the salt divided by the charge of the metal cation.

MgCl₂ ---> Mg²⁺ + 2 Cl⁻

The atom of Mg is transferring one electron to each atom of Cl. That means that it is losing two electrons.

Equivalent mass of MgCl₂ = molar mass of MgCl₂/2

That means that each mol of MgCl₂ contains two equivalents.

Equivalents of MgCl₂ = 2 * number of moles of MgCl₂

Equivalents of MgCl₂ = 2 * 3.6 Eq

Equivalents of MgCl₂ = 7.2 Eq = 7.2 Eq * 1000 mEq/Eq

Equivalents of MgCl₂ = 7200 mEq

Answer: There are 7200 mEq of MgCl₂ in the solution.

Answer:

i forgot sorry lol

Explanation:

oops

Answer:

There are three methods of thermal energy transfer: conduction, convection, and radiation. Conduction transfers thermal energy through direct contact.

Explanation:

I know this

Answer:

0.17 atm

Explanation:

Raoult´s law can be applied in solving this problem:

Pa= XaPºa   (a= acetyl bromide in this case)

where Pa = partial pressure acetyl bromide

         Xa = mole fraction of acetyl bromide in the solution

          Pºa=  vapor pressure of pure acetyl bromide = 0.75 atm(given)

Hence we can find the mole fraction of the acetone in the mixture:

Let the number of moles of acetone be a and the number of moles of thiophene be t

Xa = mol of a / ( mol of a + mol of t )        

We now have;

Molar Weight of  a= 112.95 g/mol  

number of moles of a = 51.8 g/mol x 1 mol/122.95 g  =  0.42 moles

Molar Weight of t = 84.14 g/mol  

number of moles of  t = 123 g x  1mol/84.14 g= 1.46 mol

mole fraction of a; Xa = 0.42/ (0.42 + 1.46) = 0.22

Pa = 0.22 x 0.75 atm = 0.17 atm

Answer:

The charges are typically used to determine the mole ratio and composition of the individual atoms of elements in the compound

Explanation:

Take for instance the following compounds:

\(NaOH\) and \(H_{2} O\)

I hope this helps.

Answer:

1. Identify the most complex substance.

2. Beginning with that substance, choose an element(s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element(s) on both sides.

3. Balance polyatomic ions (if present on both sides of the chemical equation) as a unit.

4. Balance the remaining atoms, usually ending with the least complex substance and using fractional coefficients if necessary. If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole numbers for the coefficients.

5. Count the numbers of atoms of each kind on both sides of the equation to be sure that the chemical equation is balanced.

Explanation:

I know that there 5 steps instead of 4 but this is what I have been taught