A) 2 and 3 only
B) 1 and 4 only
C) 2,3,4 only
D) all of the above
choose one correct answer ​

In Ferromagnetism, materials are changed into permanent magnets.

Ferromagnetism is a process in which specific materials are turned into permanent magnets. The spins of electrons are shifted and electrons become more aligned and sequence with the direction of the field.

So we can conclude that in Ferromagnetism, materials are changed into permanent magnets.

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Answer:

sulfur

Explanation:

sulfur has 4p electrons.

phosphorus has 3p electrons.

The question is asking which one has 4

The element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).

Sulfur is a chemical element that is present in the third of the periodic table.

Its atomic number is 16.

The electronic configuration of sulfur is [tex]\rm [Ne]\; 3S_2\; 3P_4[/tex]

So, sulfur contains 4 electrons in its last orbital.

Thus, the element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).

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The conjugate base of an acid is the negative ion that it forms in solution. The conjugate base of each of the following acids are indicated below;

1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)

2) HCO2H(aq)  ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)

3) H3BO3(aq)  ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)

When an acid is dissolved in water it is dissociated into ions. The conugate base of the acid is the negative ion that it forms in solution. Let us now see the conjugate base of each of the ions formed;

1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)

2) HCO2H(aq)  ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)

3) H3BO3(aq)  ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)

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Answer:

Compound C is covalent.

Explanation:

Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.

Answer:

The number of carbon atoms is twice the number of magnesium atoms

Isotopes are only formed in laboratories and is denoted as option D.

This refers to an element which has the same atomic number but different mass number due to difference in number of neutrons.

They are also usually formed in laboratories through series of chemical reactions.

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The molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.

The molarity of a solution can be calculated using the following formula:

M1V1 = M2V2

Where;

M1 × 200 = 50 × 5

200M1 = 250

M1 = 250/200

M1 = 1.25M

Therefore, the molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.

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Activation energy will be less than the energy of the products in an exothermic reaction. Therefore, option (D) is correct.

In this type of reaction, the energy of the products is lower than the energy of the reactants. As a result, the difference in energy is released as heat or light, which can be detected by measuring the temperature or observing the light emitted during the reaction.

Exothermic reactions occur spontaneously, meaning they do not require an external energy source to start the reaction. Common examples of exothermic reactions include combustion, oxidation, and neutralization. These reactions often involve the formation of stronger bonds between atoms or molecules, which releases energy in the form of heat or light.

Exothermic reactions play an important role in many natural and industrial processes, including respiration, photosynthesis, and the production of electricity in power plants.

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D. Elements within a group have similar properties.

Explanation:

Halogens tend to gain one electron so that they can get a full outer level and be stable.

We can convert ketones to alkenes by the use of;

1)B2H6 in THF

2) H2O2/NaOH

A ketone is a compound of the sort RCO. The compound contains a carbon  - oxygen double bond. The ketone can be used in the synthesis of an alkene. The question is incomplete hence I can only give a general answer.

The reaction involves the following reagents;

1)B2H6 in THF

2) H2O2/NaOH

When these two reagents are applied any ketone can be converted to an alkene.

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The two-step synthesis of the alkene from the ketone using the reagents provided is

Step1: B₂H₆ in THF.

Step2: H₂O₂ / NaOH

An alkene is a hydrocarbon compound containing double bonds between carbons.

The process of making alkenes from ketones or aldehyde is called the witting reaction or witting olefination.

Thus, the two-step synthesis of the alkene from the ketone using the reagents provided is

Step1: B₂H₆ in THF.

Step2: H₂O₂ / NaOH

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Answer:

2NaBr + Ca(OH)2 ––> CaBr2 + 2NaOH

Answer:

Enthalpy

Explanation:

The term entropy is used to express the particle scattering of a system.The term joule is a unit of energy.

The pressure of 2.29 atm  can be converted to [tex]1740.4 mm Hg.[/tex]

Conversation is a way of writing a value in another unit, it helps to reduce large values by using a unit.

It should be noted that 1 atm. =760.0 mm Hg

We were given 2.29 atm, the we can convert it to  mm Hg. as;

[tex][ 2.29 atm* 760.0 mmHg / atm.][/tex]

= 1740.4 mm Hg.

Therefore, The pressure of 2.29 atm  can be converted to [tex]1740.4 mm Hg.[/tex]

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The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.

Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.

The reaction between hydrogen and oxygen is shown as,

[tex]\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O[/tex]

Moles of water is calculated as:

[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}[/tex]

The theoretical yield of water is calculated as:

[tex]\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}[/tex]

Therefore, option D. 160 gm is the theoretical yield of water.

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Answer:

the answer is electrons

Explanation:

electrons are responsible for the chemical bonding.

Answer:

The arrow would be facing upwards from the counter to the icecube.

Explanation:

Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.

An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.

It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.

In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.

Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.

Surface tension of the water  is defined as  the tendency of  the surface to resist rupture when they are subjected to stress due to cohesive forces.

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Answer: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second

Explanation: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second

Answer:

Chemical reaction rates are usually expressed as the concentration of reactant consumed or, the concentration of product formed per unit time.

Explanation:

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The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.

Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.

In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.

Hence option (4) is correct.

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A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.

Mathematically, it can be written as:

P/T = k

A gas has a pressure P at 27 °C and we want to find the expression to calculate its pressure at 57°C.

We do so by summing 273.15.

K = 27 + 273.15 = 300 K

K = 57 + 273.15 = 330 K

P2/330 = P/300

P2 = (300/330) P

A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

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Hi there!

To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.

We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.

1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002

Answer: 0.1M NaH2PO4 & 0.1M Na2HPO4

Explanation:

The new pressure of gas when the volume of the gas is increase to 321 L at 125 °C is 212.46 torr

How to determine the new pressure

The new pressure of the gas can be obtained by using the Boyle's law equation since the temperature is constant. This is illustrated below:

P₁V₁  = P₂V₂

248 × 275 = P₂ × 321

68200 = P₂ × 321

Divide both side by 321

P₂ = 68200 / 321

P₂ = 212.46 torr

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Answer:

Gram, Kilogram, and Tonne

Explanation:

Answer:

The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon.

Explanation:

Answer:

An unconformity is a widespread surface separating rocks above and below, which represents a gap in the rock record. Unconformities occur when either erosion wears away rocks, or rock deposits never form. Therefore, a time gap exists between when the rocks below the unconformity formed and when those above it formed.

Explanation:

Explanation:

The shortest bond distance is at N2 due to its high bond order of 3. From N2 to F2 the bond distance increases despite the fact that atomic radius decreases.

H₂ is the diatomic molecule or ion that has the shortest bond length.

Diatomic atoms are those atoms which are composed of two atoms that are joined by a chemical bond.

H₂ is the simplest diatomic molecule is this.

It is diamagnetic and has only two molecular orbitals (g and u), two electrons, and a bond order of one.

It has a 74 pm bond length.

Thus, H₂ is the diatomic molecule or ion that has the shortest bond length.

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Answer:

Stirring

Explanation:

Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.

Answer:

crushing particles of solute

Explanation:

C. Walking on wet floors shows that Friction is undesirable