which pair of elements would form an ionic bond?

A. Carbon (C) and oxygen (o)

B. Strontium (Sr) and chlorine (Cl)

C. Cesium (Cs) and geranium (Ge)

D. Magnesium (Mg) and aluminum (Al)

Answer:

B

Explanation:

The same atoms can combine in more than one ratio.

The same atoms can combine in more than one ratio. Hence, option B is correct.

A covalent bond shares one or more pairs of electrons between two atoms.

Covalent bonds are the bond between non-metals that are linked together by shared electrons. Covalent compounds are named with different prefixes to identify the number of atoms in the molecule.

Hence, option B is correct.

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Answer:

31536000 seconds

Explanation:

there are 31536000 seconds in one year

Carbon and silicon are located in group 14 (4A) on the periodic table but are different in that Carbon have 2 shells of electrons, and silicon has 3 shells of electrons.

The correct option is B.

The Periodic Table is a table that arranges the elements in the order of increasing atomic number.

The Periodic Table is divided into Periods and Groups.

The periods in the periodic table are the horizontal rows found in the periodic table. Elements in the same period have the same number of electron shells.

The groups in the periodic table are the vertical colums> Elements in the same group have the same number of outermost electrons.

Carbon and silicon belong to the same group but different periods in the periodic table.

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Answer:

The oxidation state of manganese in MnO2 is +4 and in KMnO4 is +7. This can be determined by using the oxidation states of K (+1) and oxygen (-2) in KMnO4 and the fact that the sum of the oxidation states of all the elements in a neutral compound must be zero. Since there are four oxygen atoms in KMnO4, their total contribution to the oxidation state is -8. To balance this, the oxidation state of manganese must be +7, which means it has been oxidized from +4 in MnO2 to +7 in KMnO4.

Explanation:

Answer:

it is number 2

Explanation:

hope this helps it is number 11

Answer:

1.84x10^-4 moles of cyanocobalamin

Explanation:

The challenge here is to find the molar mass of cyanocobalamin.  The molecule has the chemical formula of:

C63H88CoN14O14P

Molar mass is calculated by adding the atomic masses of each atom in the compound.  (e.g., 63 carbons at 12 each, etc.).  The molar mass is found to be 1355.4 g/mole.

1355.4 grams of cyanocobalamin will contain 1 mole, or 6.02x10^23 molecules of cyanocobalamin.  But we only have 250 mg, or 0.250 grams of the compound.  Use the molar mass as a conversion factor by dividing the mass by the molar mass:

(0.250 g)/(1355.4 g/mole) = 1.84x10^-4 moles

The grams cancel and the moles moves to the top, leaving only moles cyanocobalamin.  While 1.84x10^-4 moles of cyanocobalamin doesn't sound like much, it represents:

(1.84x10^-4 moles)*(6.02x10^23 molecules/mole) = 1.11x10^20 molecules of cyanocobalamin

Answer:

Electrons, with a charge of -1.

Explanation:

The nucleus of the atom is composed of protons and neutrons.

The nucleus is where the bulk of the mass of an atom is found.

Electrons orbit the nucleus in various energy levels.

Protons have a charge of +1, neutrons have no charge, and electrons have a charge of -1.

The catalytic triad of serine, glutamic or aspartic acid, and histidine is present in serine esterase's

What is catalytic triad?
A trio of coordinated amino acids known as a catalytic triad can be found inside the active site of certain enzymes. The most typical catalytic triads in enzymes are those in hydrolase and transferase. A typical motif for producing a nucleophilic stains for covalent catalysis is an acid-base-nucleophile triad. A charge-relay network is formed by the residues to polarise as well as activate this same nucleophile, which then attacks the substrate and forms a covalent intermediate that is hydrolyzed to start releasing the product but also regenerate free enzyme. The amino acid serine or cysteine is the nucleophile most frequently, but threonine and even selenocysteine can occur.

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Answer: 7.13 L

Explanation:

What is the volume of 1.0 mole of gas at a pressure of 3.12 ATM and a temperature of 270K

AT STP OF 1 ATM OF PRESSURE AND 273K ONE MOLE OF GAS OCCUPIES 22.4 L

WE HAVE MORE THAN TRIPPLED THE PRESSURE AND SLIGHTLY LOWERED THE TEMP

THE NEW VOLUME WILL BE 22.4 x (1/3.12) x 270/273 =7.13 L

Answer:

a) Density

Explanation:

Answer:

The new volume of water in the pipette is 8.53 mL

Explanation:

The given information are;

The initial volume of water in the transfer pipette = 15.23 mL

The amount of water transferred from the pipette = 6.7 mL

The new volume of water in the transfer pipette is given as follows;

New volume of water in the pipette =  Initial volume of water in the pipette - Volume of water transferred out

Therefore, we have;

New volume of water in the pipette = 15.23 mL - 6.7 mL = 8.53 mL

The new volume of water in the pipette = 8.53 mL

Answer:

8.5

Explanation:

15.23 - 6.7 = 8.53

The correct amount of sig figs would make the answer 8.5

We have the following formula for concentration:

M = n/V

where M is molarity (concentration), n is number of moles of the solute, or it can be the amount of the solute and V is the volume of the solution.

If you kept constant V and increases n, M will increase as well.

So the concentration will increase.

Answer: D.) it increases (becomes more concentrated)

Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

Leachate is a liquid generated by water flow into or out of landfill material.

Let's understand this in detail:

Leachate is the liquid from water flowing into or out of landfill material. It is generally generated as precipitation infiltrates waste deposited in landfills and produces a polluted fluid that is toxic to the environment. Leachate is a potential cause of pollution to the natural environment and surrounding regions. Waste incineration, hazardous waste left over from the biochemical degradation of chemical wastes, methane gas that leaks from sanitary landfills, and an ash byproduct of waste incineration are all irrelevant parts of the question, and it's essential only to answer what is asked.

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Answer:

p = 36400 kg·m/s

Explanation:

p=mv

p= Momentum

m= mass (1300 kg)

v= 28

1300 × 28

= 36400 kg·m/s

The Momentum of the car is 36400 kg-m/s.

Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.  m is an object's mass and v is its velocity

Given that,

(m is an object's mass and v is its velocity)

To find :

The momentum of car, p

Solve :

Let p is the momentum of an object. It can be calculated by the product of mass and its velocity. The formula to find it is given by :

p = m x v

  = 1300 x 28

  = 36400 kg-m/s.

Therefore, the momentum of the car is 36400 kg-m/s.

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The ionization potential of Ba(OH)2 was found to be 8±1 eV, with a value of 6±1 eV for the monohydroxide.

Answer:

C + 2H2 ⇒ CH4

Explanation:

In order to balance a chemical equation you need to make sure that the number of atoms on both sides are equal

C + H2 = CH4

C = 1

H = 2

Products:

C = 1

H = 4

H2 = 2 × 2 = 4

C + 2H2 ⇒ CH4

Hope this helps.

When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction, something called a micelle is formed.

A micelle is a cluster of surfactant molecules that are formed when soap or detergent molecules are mixed with water. When soap or detergent is added to water, the hydrophobic tails of the molecules (which do not mix with water) cluster together, while the hydrophilic heads (which are attracted to water) point outwards towards the water.

Micelles are formed by the hydrophobic tails of the surfactant molecules clustering together in the center, with the hydrophilic heads facing outward.

The soap or detergent's molecules' hydrophobic tails attract oils and dirt, while the hydrophilic heads attract water molecules. The hydrophobic tails of the detergent molecules encircle the dirt and oil particles, while the hydrophilic heads point outward toward the water, creating a micelle.

The micelles disperse the dirt and oil particles throughout the water so that they can be washed away.

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Answer:

I think it is b

Explanation:

Answer: Hope it can help you :)

Explanation:

The wavelength of an electron can be calculated using the formula: wavelength = h / (mass of electron * velocity). Since kinetic energy is equal to the mass of the electron multiplied by the velocity squared, we can also calculate wavelength by using the formula: wavelength = h / sqrt(2mass of electron kinetic energy).

To convert the kinetic energies given in electron volts (eV) to Joules (J), you can use the formula: 1 eV = 1.6 x 10^-19 J

(a) 20.0 eV = 3.2 x 10^-18 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-18 J) = 2.4 x 10^-12 m or 2.4 pm (picometers)

(b) 200 eV = 3.2 x 10^-17 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-17 J) = 2.4 x 10^-11 m or 24 pm

(c) 2.00 keV = 3.2 x 10^-14 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-14 J) = 2.4 x 10^-8 m or 2.4 nm

(d) 20.0 keV = 3.2 x 10^-13 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-13 J) = 2.4 x 10^-7 m or 24 nm

(e) 0.200 MeV = 3.2 x 10^-11 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-11 J) = 2.4 x 10^-5 m or 0.24 nm

(f) 2.00 MeV = 3.2 x 10^-10 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-10 J) = 2.4 x 10^-4 m or 2.4 nm

A lower energy electron will have a longer wavelength, while a higher energy electron will have a shorter wavelength. To study the crystal structure of NaCl, you would need to use a technique such as X-ray diffraction, which typically uses X-rays with energies in the range of a few keV to a few tens of keV. Based on this, 2.00 keV and 20.0 keV energies are most suited for study of the NaCl crystal structure.

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Taking into account the reaction stoichiometry, 11.2 grams of BaSO₄ are produced from 10 g of barium chloride.

In first place, the balanced reaction is:

BaCl₂ + H₂SO₄ → BaSO₄ + 2 HCl

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 208.24 grams of BaCl₂ form 233.34 grams of BaSO₄, 10 grams of BaCl₂ form how much mass of BaSO₄?

mass of BaSO₄= (10 grams of BaCl₂× 233.34 grams of BaSO₄) ÷208.24 grams of BaCl₂

mass of BaSO₄= 11.2 grams

Finally, 11.2 grams of BaSO₄ are formed.

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Answer:

wait can you go more in detail i can help you because i dont understand whats going on

The correct option is D, The equivalence point occurs at a pH greater than 7 for a titration of a weak acid with a strong base. This is because the strong base will react with the weak acid to form a salt and water.

Titration is a commonly used analytical technique in chemistry for determining the concentration of an unknown solution by adding a known amount of a standardized solution of known concentration. The process involves slowly adding the standardized solution to the unknown solution until the chemical reaction between the two is complete. The point at which the reaction is complete is known as the equivalence point and can be detected using various indicators that change color or other properties at this point.

The main aim of titration is to accurately measure the concentration of a particular substance in a solution. For example, an acid-base titration can be used to determine the concentration of an acid in a solution by adding a known amount of a strong base until the equivalence point is reached. Similarly, a redox titration can be used to determine the concentration of a reducing or oxidizing agent in a solution.

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Answer:

2 ZnO + C = 2 Zn + CO2

Explanation:

Answer:

2ZnO + C → 2Zn + CO2

Explanation:

The molecule that exhibits dispersion forces as its strongest intermolecular force among the given options is CH4 (methane). Dispersion forces, also known as London dispersion forces or van der Waals forces, are the weakest intermolecular forces. In CH4, the molecule is nonpolar, and there are no stronger forces like hydrogen bonding or dipole-dipole interactions present. As a result, dispersion forces are the strongest intermolecular forces in CH4.

Out of the given options, the molecule that exhibits dispersion forces as its strongest intermolecular force is CH4. Dispersion forces are the weakest type of intermolecular forces that occur due to temporary shifts in electron density in a molecule. As CH4 is a nonpolar molecule, it has no permanent dipole moment. Hence, its intermolecular forces are dominated by dispersion forces. NH3, S2, and CF4 have other intermolecular forces in addition to dispersion forces, such as hydrogen bonding, dipole-dipole interactions, and induced dipole-dipole interactions, respectively. Therefore, CH4 with its structure is an example of a molecule with dispersion forces as its strongest intermolecular force.
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Based on its name, the carbon compound that contains the fewest carbon atoms is methane (CH4). The name of a carbon compound often provides information about its chemical composition.

In the case of methane, the prefix "meth-" indicates that it contains a single carbon atom. The "-ane" suffix indicates that it is an alkane, a type of hydrocarbon with single bonds between carbon atoms. Methane consists of one carbon atom bonded to four hydrogen atoms, giving it the chemical formula CH4.

Methane is the simplest hydrocarbon and the smallest carbon compound in terms of the number of carbon atoms. Other carbon compounds may have longer names and more complex structures, but based solely on the name, methane is the carbon compound with the fewest carbon atoms.

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