the element magnesium has 3 orbital and 3 electrons true or false​

The average body temperature is 98.6°F (37°C), with the normal range being 97°F (36.1°C) to 99°F (37.2°C).

According to the website where customers may make claims, the lawsuit claimed that Celsius mislabeled its products as having no preservatives even though they did contain citric acid. According to Celsius, it was introduced as flavour, not as a preservative, and it refuted the accusations.

Although it might not be directly dangerous, we don't advise drinking Celsius frequently. We still believe Celsius to be healthier than branded energy drinks like Red Bull, despite all of the dubious additives we mentioned in our review.

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Answer

C. Elements in the same column of the periodic table have the same number of electron shells.

Explanation

All the options given are true about the periodic table EXCEPT

C. Elements in the same column of the periodic table have the same number of electron shells.

The reason is elements of the same period have the same number of electron shells. As the elements in a group have the same number of electrons in the outermost shell and valency depends upon the valence electrons in an atom. Therefore all the elements of a group have the same valency or valence electron.

Based on the given information, it is possible that the mineral with the weaker reaction is a feldspar mineral, specifically an orthoclase or plagioclase feldspar.

The weaker reaction of a mineral with dilute hydrochloric acid (HCl) suggests that the mineral is likely composed of a mineral group that is less susceptible to acid dissolution. One such mineral group is the feldspar group.

Feldspar minerals, such as orthoclase and plagioclase, are commonly found in light-colored rocks and have a moderate to weak reaction with dilute HCl. They typically show a faint effervescence or no reaction at all when HCl is applied.

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Answer:

Hydrogen (H) “burning” initiates the fusion energy source of stars and leads to the formation of helium (He).

FUSION Reaction

Explanation:

mark me brainliest please.

Answer:

hydroelectric

Explanation:

The parts of the chemical equation to the correct description are done below.

Column A              Column B

1. Cl₂ + Ail₃ ----------- c. Reactants

2. I2 + AlCl3. ---------- a. Products

3. 3.(g) or (aq) ---------  d. State of Matter

4. 4.--> -------------------- b. Shows which way the reaction progresses.

Chemical equations tell us the factors and/or compounds that can be reacting and the product(s) of the response. The coefficients on the materials in the response tell us the mole ratio or molecular ratio of the elements/compounds inside the reaction. A chemical equation is the symbolic representation of a chemical response in the form of symbols and chemical formulation.

Chemical equations are an efficient way to explain chemical reactions. This module explains the shorthand notation used to express how atoms are rearranged to make new compounds at some stage in a chemical reaction. It indicates how balanced chemical equations convey the proportions of each reactant and product concerned.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

i hope it will help you

Explanation:

To find the formula of an ionic compound, first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge. Finally, combine the two ions to form an electrically neutral compound.

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Actually Welcome to the Concept of the Magnetism.

Since any magnetic object like true magnets, permanent magnets and solenoids always have a magnetic field lines around them that , originate from North Pole and Drive to South Pole, hence,

The most intensive and strong magnetic field are close to the poles.

A. is the correct answer.

===> A. The magnitude is greatest close to the poles.

If the centers of two objects are close to each other then greater will be the magnitude of the force of gravity. Hence the gravitational force will be greater in poles than the equator. The correct option is A.

The gravitational force is regarded as the universal force which attracts all the physical forms of the earth having mass. It is considered as an attractive force exerted on all objects.

The expression for gravitational force is:

F = G m₁m₂ / r²

The gravitational force is directly proportional to the masses of the objects and inversely proportional to the distance between them.

The gravitational force is maximum at poles than the equator. It is because the poles are found to be closer to the earth than the equator due to the oblateness of earth.

The distance of the equator from the center of the earth is found to be greater than that of the poles. Hence the maximum force is at poles.

Thus the correct option is A.

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Answer:

Given

[HONH2] = 0.45M

[OH-] = 5.26 x 10-6 M

                                           HONH2 + H2O -------------> HONH3+ + OH-

Initial                                     0.45           55                         0             0

at equilibrium                        0.45-x        55-x                      x             x

Given

[OH-] = x =  5.26 x 10-6 M

Therefore [HONH3+] = x =  5.26 x 10-6 M

pOH = -log[OH-] = -log(5.26 x 10-6) = 5.279

=> pH = 14- pOH = 8.72

From hendersen-hasselbach equaiton

8.72 = pKa + log(0.45/5.26 x 10-6)

=> pKa = 3.788

=> pKb = 14-3.788 = 10.21

percent of ionization = 5.26 x 10-6 * 100/0.45 = 1.17 x 10-3 %

concentration of NaOH required to make the same pH= [OH-] = 5.26 x 10-6 M

Percent of ionization of NaOH = [OH-]*100/NaOH = 5.26 x 10-6 *100/5.26 x 10-6 = 100%

The quantities that are constant in an isolated system are mechanical energy, mass, total energy, and momentum

In an isolated system, the amount of mechanical energy will remain constant since no energy is transferred in or out of the system. The mass of the system will also remain constant as it is not affected by any external factors. The total energy will also remain constant as there is no energy transfer from or to the system.

The momentum will also be constant in an isolated system since it is conserved. However, the temperature, electric charge, and entropy are not constant in an isolated system. The entropy will always increase due to the second law of thermodynamics while the temperature may increase or decrease depending on various factors like heat transfer, radiation, and others.The velocity may also change depending on various factors affecting the system.

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125 ml of ethanol contain, of ethanol is \(2.44 moles\)

Moles are a unit of measurement used to quantify the amount of a substance. One mole of a substance is equal to 6.02 x 10^23 particles, also known as Avogadro's number. This number is used in many equations to describe the amount of a substance, such as the ideal gas law, which is PV = nRT, where n is the number of moles. Another equation used to describe moles is the mass-molarity equation, which states that the molarity of a solution is equal to the mass of the solute divided by the molar mass multiplied by the volume of the solution.The moles of ethanol present in 125 ml of ethanol can be calculated using the density and the molar mass of ethanol. The molar mass of ethanol is 46 g/mol.

Therefore, the number of moles of ethanol present in 125 ml of ethanol can be calculated using the following equation:

\(Moles=\frac{ (Density * Volume) }{ Molar Mass}\)

Moles = \(\frac{(0.789 g/ml x 125 ml) }{ 46 g/mol}\)

Moles = \(2.44 moles\)

Therefore ,125 ml of ethanol contain, of ethanol \(2.44 moles\) .

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Moles of Carbon dioxide : 13.5

Given

4.5 moles propane

Required

moles of Carbon dioxide

Solution

Reaction(Combustion of Propane) :

C₃H₈(g)+5O₂(g)→3CO₂(g)+4H₂O(g)

In a chemical equation, the reaction coefficient shows the mole ratio of the reacting compounds (either in reactants or products)

From the equation, mol ratio of Propane(C₃H₈) : Carbon dioxide(CO₂) : 1 : 3, so mol CO₂ :

= 3/1 x mol Propane

= 3 x 4.5 moles

= 13.5 moles

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

Answer:

Decomposition of potassium chlorate yields potassium chloride and oxygen as:

2KClO

3

→2KCl+3O

2

Thus 2 moles of potassium chlorate yields 3 moles of oxygen gas.

2 moles of potassium chlorate =2×122.5=245g of potassium chlorate

At STP, the volume occupied by 1 mol of gas =22.4 dm

3

the volume occupied by three moles of a gas =3×22.4=67.2dm

3

Therefore, 245g of potassium chlorate yields 67.2dm

3

of oxygen gas

To liberate 6.72 dm

3

oxygen amount of potassium chlorate required is

=

67.2

245

×6.72=24.5g

Hence, 24.5 g of potassium chlorate required to liberate 6.72 dm

3

of oxygen at STP

Answer:

Hence, 24.5 g of potassium chlorate required to liberate 6.72 dm

3

of oxygen at STP

Answer:

In flame of pure hydrogen burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) with the release of energy. In atmospheric air rather than pure oxygen, hydrogen combustion may yield a small amount of nitrogen oxides with the water vapor. The energy released allows hydrogen to be used as a fuel.

Explanation:

Here are the steps that occur during the combustion of hydrogen; Initiation, Propagation, Completion, and Energy Release.

The combustion of hydrogen involves a chemical reaction with oxygen in the air, resulting in the release of energy in the form of heat and light.

Initiation: The combustion process begins by supplying energy to break the initial bonds in the reactant molecules. In the case of hydrogen combustion, heat or an external ignition source is provided to break the diatomic hydrogen molecules (H₂) into individual hydrogen atoms (H).

H₂ → 2H

Propagation: Once the hydrogen molecules are dissociated into hydrogen atoms, they react with oxygen (O₂) molecules from the air. This reaction occurs in a chain reaction mechanism involving three steps: initiation, propagation, and termination.

Initiation: Hydrogen atoms react with oxygen molecules to form hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH).

H + O₂ → HO₂

H + HO₂ → H₂O₂

Propagation: The hydroxyl radical (OH) reacts with hydrogen molecules to form water vapor (H₂O) and release heat.

OH + H₂ → H₂0 + H

Termination: The chain reaction terminates when two radicals combine to form stable products.

H + OH → H₂0

Completion: The chain reaction continues as long as there is a sufficient supply of hydrogen and oxygen. The hydrogen atoms released in the propagation step can initiate further reactions with more oxygen molecules, leading to the complete combustion of hydrogen to form water vapor (H₂O).

H₂ + O₂ → H₂O

Energy Release: The combustion of hydrogen is an exothermic reaction, which means it releases energy in the form of heat and light. This energy is responsible for the heat and light produced by a burning hydrogen flame.

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Answer:

solids

Explanation:

Solid is A substance with definite volume and shape. Solids do not flow and therefore do not conform to the shape of their containers. Liquid - A substance with definite volume but without definite shape

Answer:B-Solids

Explanation:

1054.67 grams of calcium phosphate are theoretically produced if we start with 3.40 moles of ca(no3)2 and 2.40 moles of li3po4.

To determine the theoretical yield of calcium phosphate (Ca3(PO4)2) produced from 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4, we need to identify the limiting reactant and use stoichiometry.

First, we need to determine the moles of calcium phosphate produced from each reactant. The balanced equation for the reaction is:

3Ca(NO3)2 + 2Li3PO4 → Ca3(PO4)2 + 6LiNO3

From the equation, we can see that the molar ratio between Ca(NO3)2 and Ca3(PO4)2 is 3:1. Therefore, the moles of calcium phosphate produced from Ca(NO3)2 would be 3.40 moles.

Similarly, the molar ratio between Li3PO4 and Ca3(PO4)2 is 2:1. Therefore, the moles of calcium phosphate produced from Li3PO4 would be 2.40/2 = 1.20 moles.

Since the moles of calcium phosphate produced from Ca(NO3)2 (3.40 moles) are higher than those produced from Li3PO4 (1.20 moles), Ca(NO3)2 is the limiting reactant.

To calculate the mass of calcium phosphate, we can use the molar mass of Ca3(PO4)2, which is approximately 310.18 g/mol.

Mass of calcium phosphate = Moles of calcium phosphate × Molar mass

Mass of calcium phosphate = 3.40 moles × 310.18 g/mol

Mass of calcium phosphate ≈ 1054.67 grams

Therefore, theoretically, approximately 1054.67 grams of calcium phosphate would be produced when starting with 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4.

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To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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The correct formula for the compound formed between barium and sulfur is BaS. Ba

The correct formula for the compound formed between barium and sulfur is BaS. Ba represents the chemical symbol for barium, and S represents the chemical symbol for sulfur. When barium and sulfur combine, they form an ionic compound with a 1:1 ratio of barium ions (Ba2+) and sulfide ions (S2-). The compound BaS indicates that one barium atom combines with one sulfur atom to form an ionic compound. In BaS, barium has a 2+ charge (Ba2+), and sulfur has a 2- charge (S2-).

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Molar mass of N2 = 14×2=28g/mol

Moles of N2 =mass/molar mass

Mass of N2 = moles × molar mass

Mass of N2 = 15.7 × 28 = 439.6 kg

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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The ideal gas law is important due to many reasons. Two of which are as follows:a) Many industrially important reactions are carried out in the gas phaseb) Chemists must be able to quantitatively treat gaseous products and reactant.

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a. Many industrially important reactions are carried out in the gas phase.

c. Chemists must be able to quantitatively treat gaseous products and reactants.

The reasons the ideal gas law is important include:

a. Many industrially important reactions are carried out in the gas phase. Understanding the behavior of gases and their properties is crucial in designing and optimizing these processes.

c. Chemists must be able to quantitatively treat gaseous products and reactants. The ideal gas law provides a framework for calculating and predicting the behavior of gases in chemical reactions, allowing chemists to analyze and understand the outcomes of these reactions.

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In layperson's terms, P(High Fat ∩ High Sugar) refers to the probability of an event where an item is high in both fat and sugar. It is a statistical representation of the likelihood that an item will contain high levels of both fat and sugar.

In this case, the key word that is generally associated with probability calculation is "and". This means that we are looking for the probability of both conditions being met, which is the intersection (∩) of the two events. The formula for the probability of the intersection of two events is:

P(A ∩ B) = P(A) x P(B|A)

In this case, A is the event of an item being high in fat, and B is the event of an item being high in sugar. P(A) represents the probability of an item being high in fat, while P(B|A) represents the probability of an item being high in sugar, given that it is already high in fat.

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A significant amount of heat energy is produced when the sulfuric acid combines with the water. Because acid is heavier than water, it should be added to the concentrated sulphuric acid during diluting because acid spurts because the heat from the developed acid is lost in the water.

H2SO4 is diluted by adding acid to water rather than water to acid because the exothermic reaction that occurs when water is added could cause the acid to splash out of the container.

The exothermic reaction that occurs when water is introduced to a concentrated acid might result in burns because of the heat that is produced. On the other hand, because less heat is produced when acid is gently added to water while swirling continuously, the combination won't splash out.

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Answer:

because electron is a negetively charge particle that orbits the outer part of atom and despite being small it is a strong proton.

Explanation:

The net ionic equation of the acid-base reaction that dissolves the solid with the magnesium ion is Mg²⁺ + 2H⁺ → Mg²⁺ + 2H₂O.

Let's start with some basic definitions. An acid is a substance that donates hydrogen ions (H⁺) in a solution, while a base is a substance that accepts H⁺ ions. Acids have a pH value less than 7, while bases have a pH value greater than 7.

When an acid reacts with a base, the H⁺ ion from the acid combines with the OH⁻ ion from the base to form water (H₂O). The remaining ions from the acid and base combine to form a salt.

Let's say we are dissolving the solid in hydrochloric acid (HCl). HCl is a strong acid, meaning it completely dissociates into its ions (H⁺ and Cl⁻) in a solution.

So, when we add the solid containing Mg²⁺ to the HCl solution, the following reaction occurs:

Mg²⁺ + 2H+ + 2Cl⁻ → MgCl₂ + 2H₂O

This is the overall balanced equation, but we can simplify it by writing the net ionic equation. This just shows the ions that actually participate in the reaction:

Mg²⁺ + 2H⁺ → Mg²⁺ + 2H₂O

The Cl⁻ ion doesn't actually participate in the reaction, so it is not included in the net ionic equation.

To summarize, the net ionic equation of the acid-base reaction that dissolves the solid with the magnesium ion is Mg²⁺ + 2H⁺ → Mg²⁺ + 2H₂O.

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The volume of insulation material required is approximately 0.003606 cubic meters (m³).

To calculate the volume of insulation material, we can subtract the volume of the inner pipe (original pipe) from the volume of the outer pipe (original pipe + insulation).

Given:

Length of the pipe, L = 10 m

Radius of the pipe, r = 7 cm = 0.07 m

Thickness of the insulation, dr = 2 mm = 0.002 m

The outer radius of the larger pipe is R = r + dr.

Using the formula for the volume of a cylinder, V = π(R² - r²)L, we can substitute the values and calculate:

V = π((0.07 + 0.002)² - 0.07²) × 10

V ≈ 3.606 × 10⁻³ m³

Therefore, the volume of insulation material required is approximately 0.003606 m³ (cubic meters).

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