Which three elements have the most similar chemical properties?
1.
Ar, Kr, Br
2
K, Rb, Cs
3.
B, C, N.
4.
O, N, Si

ANSWER:

It is about 92.2 moles of magnesium.

Stoichiometry is omitted reactant. Reactants are the substances that participate in a chemical reaction. The process by which atoms, the fundamental building blocks of matter.

Rearrange themselves to form new combinations is described by a chemical reaction. Reactants - Reactants are the substances that participate in a chemical reaction. Products - Substances formed as a result of the formation of new bonds in a chemical reaction are referred to as products. As an example: H2 and O2 are reactants in this case because they participate in the chemical reaction. Reactants are the starting materials and appear on the left side of the equation. The products of the reaction are written on the right-hand side of the equation.

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Answer:

The balanced chemical equation for the reaction is:

C + 2H2 → CH4

From the equation, we can see that 1 mole of carbon reacts with 2 moles of hydrogen to produce 1 mole of methane. Therefore, to produce 7.8 moles of methane, we would need:

1 mole of carbon = 1 mole of CH4 / 2 moles of H2 = 1/2 mole of CH4

7.8 moles of CH4 = 7.8 × (1/2) moles of C = 3.9 moles of C

Now, we can use the molar mass of carbon to convert moles to grams:

Atomic mass of carbon (C) = 12.01 g/mol

3.9 moles of C × 12.01 g/mol = 46.8 g of C

Therefore, we need 46.8 grams of carbon to produce 7.8 moles of methane (CH4). Rounded to the nearest tenth, the answer is 46.8 grams.

If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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The correct option is (d) Oxidation, Reduction.

NAD+ + 2H -> NADH is an oxidation reaction and FADH2 -> FAD + 2H is a reduction reaction.

An oxidation reaction is a type of chemical reaction where electrons are transferred from one molecule, atom, or ion to another. Specifically, in an oxidation reaction, the substance that loses electrons is said to be oxidized, while the substance that gains electrons is said to be reduced. A reduction reaction is a chemical reaction in which an atom, ion, or molecule gains one or more electrons. This results in a decrease in the oxidation state of the species undergoing reduction. In a reduction reaction, the species that gains electrons is referred to as the oxidizing agent, as it facilitates the reduction of the other species involved in the reaction.

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Answer:

Because it helps predict the types of chemical reactions that a particular element is likely to participate in by telling each element's atomic number and usually its atomic weight

Explanation:

Answer:

I am not sure which number would be considered correct.

unrounded: 5,427.5559

rounded to the nearest thousandth: 5,427.556

rounded to the nearest hundredth: 5,427.56

rounded to the nearest tenth: 5,427.6

rounded to the nearest whole number: 5,428

Explanation:

112.839 * 48.1 = 5,427.5559

The number of molecules of CO2 contained in a 5.00 L tank at 7.53 atm and 485 K can be calculated using the ideal gas law and Avogadro's number. The correct answer is option e, which is 2.45 x 10^24 molecules.

To determine the number of CO2 molecules in the tank, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure in atmospheres (7.53 atm)

V = Volume in liters (5.00 L)

n = Number of moles of gas (to be determined)

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature in Kelvin (485 K)

Rearranging the equation to solve for n:

n = PV / RT

Substituting the given values:

n = (7.53 atm) * (5.00 L) / (0.0821 L·atm/(mol·K) * 485 K)

n = 0.1848 mol

Now, to convert moles to molecules, we can use Avogadro's number, which states that 1 mole of a substance contains 6.022 x 10^23 molecules.

Number of molecules = (0.1848 mol) * (6.022 x 10^23 molecules/mol)

Number of molecules = 1.112 x 10^23 molecules

Therefore, the correct answer is option e, which is 2.45 x 10^24 molecules.

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The formula for the relationship between weight and blood pressure in children is:

We differentiate the above function with respect to x Therefore:

Rate of change at the 70-pound weight level:

Blood is a fluid found in all living things that functions to deliver substances and oxygen needed by body tissues, transports chemical products of metabolism, and also acts as the body's defense against viruses or bacteria. Blood has the function of regulating acid and base balance. ,transports O2, carbohydrates, and metabolites, regulates body temperature by conduction or conduction, carries body heat from heat production centers (liver and muscles).

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Answer:

A. Plate Boundary movements

Explanation:

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U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

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Answer:

The ionic bond is the electrostatic force of attraction between a positively charged metal ion and a negatively charged non-metal ion. Metals form positive ions because they lose electrons to become stable. ... Non-metals form negative ions because they gain electrons to become stable.

Answer:

Linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom. ... Sodium chloride exhibits ionic bonding.

The mass number of an ion with 109 electrons, 158 neutrons, and a 1 charge is 267. In atoms, the mass number is the total number of protons and neutrons in the nucleus.

However, ions are atoms that have gained or lost electrons, resulting in a change in their charge. In this case, the ion has a 1 charge, indicating that it has lost one electron. Since the number of protons remains the same for an element, which is determined by its atomic number, we can deduce that the atom originally had 110 electrons to balance the 110 protons. To find the mass number, we add the number of protons (110) and neutrons (158) since they contribute to the overall mass of the atom. Therefore, the ion's mass number is 267 (110 protons + 158 neutrons).

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Answer:

hi.

Explanation:

1. B

2. C

3. A

4. B

5.B

hope this helps

(SOMEONE ELSE'S ANSWER TO THE SAME QUESTION I FOUND I HOPE THIS HELPS!) Given:

mass of Na₂SO₄ = 25.0 g

Required:

moles of Na

number of Na particles

Solution: (moles of Na)

Step 1: Calculate the molar mass of Na₂SO₄.

molar mass of Na₂SO₄ = (22.99 g/mol × 2) + (32.07 g/mol × 1) + (16.00 g/mol × 4)

molar mass of Na₂SO₄ = 142.05 g/mol

Step 2: Calculate the number of moles of Na by using dimensional analysis.

Since there are 2 mol of Na in 1 mol of Na₂SO₄, the number of moles of Na is

Solution: (number of Na particles)

Answer:

The statement that is false for the chemical equation N2 + 3H2 = 2NH3 is (a). One mole of N2 will produce three moles of H2. In this reaction, one mole of N2 reacts with three moles of H2 to produce 2 moles of NH3. Therefore, one mole of N2 will not produce three moles of H2.

Explanation:

There are several pieces of evidence that can be used to identify chemical changes, other than a change in color. Some of these include the production of a gas, the formation of a precipitate, a change in temperature, and a change in the state of matter (e.g. from a solid to a liquid or vice versa). For example, if a solid substance is added to a liquid and bubbles of gas are produced, this is evidence of a chemical change. Similarly, if two clear solutions are mixed together and a solid precipitate forms, this is also evidence of a chemical change. Additionally, if a substance is heated and it changes from a solid to a liquid or from a liquid to a gas, this is also evidence of a chemical change.

Answer:

A

Explanation:

Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).

Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from  the initials green and orange  color   and brick red precipate of copper (ii) ,which would not dissolve in solution.

However, with non reducing the Benedict's gives a negative test.Because no color change occurs.

In either case,the chemical reaction that occurs as the solution gained heat  is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.

Answer:

c. CH4 < NH3 because the NH bond is more polar than the CH bond.

Explanation:

Actually, the electronegativity difference between carbon and hydrogen is just about 0.4. This meager difference in electronegativity corresponds to a nonpolar bond between the two atoms.

However, the electronegativity difference between nitrogen and hydrogen is about 0.9. This larger electronegativity difference corresponds to the existence of a polar covalent bond between the two atoms.

Hence the N-H bond is significantly polar unlike the C-H bond. This implies that CH4 molecules are only held together by weak dispersion forces while NH3 molecules are held together by stronger dipole-dipole interactions and hydrogen bonds.

Answer:

CH4 < NH3 because the NH bond is more polar than the CH bond.

Explanation:

Answer:

0.2 mol MgCl₂

Explanation:

ΔT = Kb . m . i

ΔT = Boiling T° of solution - Boiling T° of pure solvent

Kb is a constant. For water is 0.52 °C/m

m = molality (moles of solute in 1kg of solvent)

i = numbers of ions dissolved.

That's all the elements for the formula to determine the elevation of boiling point.

We assume, that molality will be at least the same for salts with 0.1 moles and 0.2 moles. For 0.1 mol :

1L of water contains 1000g of it, so we can also say that 1kg of water is contained in 1 L of water. Remember that density is 1g/mL or 1kg/L

So concentrations for 0.1 moles are, 0.1 mol/kg and for 0.2moles, 0.2 mol/kg. Let's dissociate the salts to determine i:

KI  → K⁺  +  Cl⁻     i = 2

MgCl₂  → Mg²⁺  +  2Cl⁻    i = 3

The highest difference will be at the 0.2 moles of MgCl₂, so that will be the sample that produces a solution with the highest boiling point.

Boiling T° of solution = 0.52 °C/m . 0.1m . 2  + 100°C = 100.10°C

Boiling T° of solution = 0.52 °C/m . 0.2m . 2  + 100°C = 100.20°C

Boiling T° of solution = 0.52 °C/m . 0.1m . 3  + 100°C = 100.15°C

Boiling T° of solution = 0.52 °C/m . 0.2m . 3  + 100°C = 100.31°C

Answer: Because the gas is collected over water, it is not pure but is mixed with vapor from the evaporation of the water. Dalton’s law can be used to calculate the amount of the desired gas by subtracting the contribution of the water vapor.

In order to solve a problem, it is necessary to know the vapor pressure of water at the temperature of the reaction (see Table below). The sample problem illustrates the use of Dalton’s law when a gas is collected over water.

Vapor Pressure of Water (mmHg) at Selected Temperatures (°C)

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70

4.58 6.54 9.21 12.79 17.54 23.76 31.82 42.18 55.32 71.88 92.51 118.04 149.38 187.54 233.7

Sample Problem: Gas Collected by Water Displacement

A certain experiment generates 2.58 L of hydrogen gas, which is collected over water. The temperature is 20°C and the atmospheric pressure is 98.60 kPa. Find the volume that the dry hydrogen would occupy at STP.

Step 1: List the known quantities and plan the problem.

Known

Unknown

The atmospheric pressure is converted from kPa to mmHg in order to match units with the table. The sum of the pressures of the hydrogen and the water vapor is equal to the atmospheric pressure. The pressure of the hydrogen is found by subtraction. Then, the volume of the gas at STP can be calculated by using the combined gas law.

Step 2: Solve.

Now the combined gas law is used, solving for

, the volume of hydrogen at STP.

Step 3: Think about your result.

If the hydrogen gas were to be collected at STP and without the presence of the water vapor, its volume would be 2.28 L. This is less than the actual collected volume because some of that is water vapor. The conversion using STP is useful for stoichiometry purposes.

Summary

The vapor pressure due to water in a sample can be corrected for in order to get the true value for the pressure of the gas.

Review

Why is gas collected over water not pure?

Why would we want to correct for water vapor?

In a lab, 2.20 L of gas is collected over water at a temperature of 30°C and a total pressure of 735.43 mmHg. Find the volume that the dry nitrogen of gas would occupy at STP.

Explore More

Use the resource below to answer the questions that follow.

An atom has a charged as well as neutral particles and these particles is called subatomic. The term for the negatively charged subatomic particle are called electrons.

An atom is the smallest unit of matter. There are three main types of subatomic particles : protons, neutrons and electrons. Two subatomic particles have charged particles, that is, protons are positively charged and electrons are negatively charged. An electron is a daughter particle of an atom, a negatively charged particle that orbits around the nucleus at a constant. Scientist J. J. Thompson discovers the electron. An electron has a charge of negative 1.60217662 × 10⁻¹⁹ Coulombs. The mass of a electron is 9.1093835× 10⁻³¹kg.

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Answer: Combustion

Explanation:

Methane gas or natural gas is the hydrocarbon that reacts with oxygen as shown below: CH4 + 2O2 → CO2 + 2H2O There are two types of combustion reactions: complete and incomplete combustion. Therefore there are four products, carbon dioxide, water, carbon, and carbon monoxide.

 overall equation is ,

2FeSo4+heat→Fe203+SO2+SO3

Decomposition reaction is when Reactant break down into simpler parts .

For decomposition reactions require energy input. The decomposition reaction happens in our everday life. The process of digestion food is a type of decomposition ,where breakdown of food from larger to smaller particles and large amount of energy release.

The decomposition is classified into

*thermolysis

*Electrolysis

*photolysis

The overall equation will be

2FeSo4+heat→Fe2O3+SO3+So2

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Blue = orange/yellow light (wavelengths around 450-500 nm) is absorbed by the solution that appears blue.

Red = green light (wavelengths around 550-600 nm) is absorbed by the solution that appears red.

Orange = blue light (wavelengths around 450-500 nm) is absorbed by the solution that appears orange.

Green = red light (wavelengths around 650-700 nm) is absorbed by the solution that appears green.

Give a short note on absorption.

Color absorption takes place because substances selectively absorb certain wavelengths of visible light, while transmitting or reflecting others. The color that we perceive is the result of the wavelengths of light that are not absorbed, but rather transmitted or reflected, and detected by our eyes. This phenomenon is commonly used in colorimetric analysis and can provide important information about the electronic structure and composition of a substance.

Hence, the answer is,

Blue = orange/yellow light

Red = green light

Orange = blue light

Green = red light

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The corresponding change in pressure in atm is 0.276 atm.

Physical pressure applied to an object. Per unit area, a perpendicular force is delivered to the area of the objects. Pascals are a unit of pressure (Pa).

Briefing :

The change in pressure in the mercury barometer is given by ΔP = ρgh where

ρ = density of mercury = 13600 kg/m³,

g = acceleration due to gravity = 9.8 m/s² and

h = height of mercury = 21 cm = 0.21 m

So, ΔP = ρgh

= 13600 kg/m³ × 9.8 m/s² × 0.21 m

= 27988.8 kg/m-s²

= 27988.8 N/m²

= 27988.8 Pa

The change in pressure in atm

Since 1 atm = 101325 Pa

27988.8 Pa = 27988.8 Pa × 1 atm/101325 Pa

= 0.276 atm

So, the corresponding change in pressure in atm is 0.276 atm.

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Answer:

C, Si, Al

Explanation:

We use periodic trends to help us find the atomic radii. The trend for atomic radii on the Periodic Table of Elements is down and to the left. So whichever elements are furthest to the left and farthest down have the largest atomic radii.