Why is an atom considered electrically neutral?

Order of decreasing standard molar entropy: Ba(s) > Ca(s) > Mg(s)

The value of molar entropy depends of two factors of the molecular structure of a substance:

a) The mass of the atoms and molecules, the greater the mass, the greater is the molar entropy.

b) The degree to which the movement of the molecules and atoms in the structure is restricted, the less restricted this movement, the greater is the molar entropy.

All metals are the in the solid state, so molar entropy only depends of molar mass of the metals.

Molar mass of barium (Ba) is 137.3 g/mol.

Molar mass of calcium (Ca) is 40.1 g/mol.

Molar mass of magnesium (Mg) is 24.3 g/mol.

Barium has the greatest molar mass, it has greatest molar entropy.

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To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).

Answer:

The mean value theorem tells us the average velocity must be between the minimum velocity and the maximum velocity. The only way it can be either the minimum or the maximum is if velocity is constant. So of course instantaneous velocity can be greater and can be less.

Explanation:

B. 2Na:Cl2

2 moles of sodium react with 1 mole of chlorine to generate 2 moles of sodium chloride.

5 moles of sodium will react with 2/51 =2.5 moles of chlorine to form 5.0 moles of NaCl.

Because 3.0 moles of chlorine are present, chlorine is an excess reagent.

As a result, the Cl is the oxidising agent since it pushed the 2I to lose one electron while also gaining two electrons. 2I is the reducing agent.

Sodium is in the 0 oxidation state on the LHS and changes to +1 in the product, therefore it is oxidised. Hydrogen was +1 on the reactant side and goes to 0 oxidation state on the RHS, hence it is reduced.

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Answer:

Any type of movement

Explanation:

All muscles are used for any way of movement in the body.

The correct answer is C. Nucleus. Nucleus is not a sub atomic particle of an atom.

The nucleus is not a subatomic particle of an atom; it is the central part of an atom that contains protons and neutrons. Protons, neutrons, and electrons are the three main subatomic particles that make up an atom.

A. Electrons are negatively charged particles that orbit around the nucleus in specific energy levels or electron shells.

B. Protons are positively charged particles located within the nucleus of an atom. They carry a positive electrical charge and contribute to the atomic number, determining the element's identity.

D. Neutrons are neutral particles found within the nucleus of an atom. They have no electrical charge but contribute to the atomic mass of an atom.

hence option c. Nucleus is the correct answer.

The nucleus, consisting of protons and neutrons, is the central core of an atom and contains most of its mass. Electrons exist outside the nucleus in specific energy levels. In summary, while electrons, protons, and neutrons are subatomic particles, the nucleus itself is not a subatomic particle but rather a structure within the atom that contains protons and neutrons.

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False. The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

The molar mass of CO2 is approximately 44 g/mol, while the molar mass of H2 is approximately 2 g/mol. Using Graham's law of effusion, we can calculate the ratio of the rates of effusion of CO2 to H2 as:

Rate of effusion of CO2 / Rate of effusion of H2 = sqrt(Molar mass of H2 / Molar mass of CO2)

Rate of effusion of CO2 / Rate of effusion of H2 = sqrt(2 g/mol / 44 g/mol)

Rate of effusion of CO2 / Rate of effusion of H2 = 0.232

Therefore, the rate of effusion of H2 is approximately 4.31 times faster than the rate of effusion of CO2 under the same conditions. If a 3.0-mole sample of CO2 gas effused through a pinhole in 18.0 s, it would take less time for an equal number of moles of H2 to effuse through the same pinhole under the same conditions. The exact time would depend on the size of the pinhole and other factors, but it would be less than 18.0 s.

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Answer:

when chemical bonds between atoms are formed or broken

Under the condition of a muscle at rest, the Golgi tendon organ (GTO) would be very active, but the muscle spindle would not be very active.

(a) A muscle at rest: When a muscle is at rest, the Golgi tendon organ (GTO) would be highly active. The GTO is located at the junction between the muscle and tendon and is sensitive to changes in muscle tension. During rest, there is minimal tension in the muscle, and the GTO detects this low tension. In response, the GTO sends inhibitory signals to the muscle, preventing excessive contraction.

On the other hand, the muscle spindle is not very active when the muscle is at rest. The muscle spindle is responsible for detecting changes in muscle length. Since the muscle is not being stretched or experiencing significant movement at rest, the muscle spindle is not actively sending signals to the nervous system.

In summary, during muscle rest, the Golgi tendon organ is highly active due to low muscle tension, while the muscle spindle is not very active since there is no significant stretch or movement.

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A basic amino acid has an R group that contains ( D) a carboxyl group.

Acid is a substance that has a pH level of lower than 7.0 and is capable of corroding or dissolving other substances. It is usually found in aqueous solutions and is a highly reactive substance. Examples of acid include sulfuric acid, hydrochloric acid, nitric acid and acetic acid. These are used in a variety of industries such as food production, industrial cleaning and chemical engineering. Acid is also used in the laboratory for titrations, pH testing and other experiments. Acids can be dangerous if mishandled and can cause skin, eye and respiratory irritation and even chemical burns.

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Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer:

1. Ar, Cl, Al, Mg, Na

2. O, S, Se, Te, Po

Explanation:

Just remember the trends. From left to right, atomic radius decreases because proton increases and pulls electrons closer. From top to bottom, atomic radius increases because there are more electron shells.

Answer:

as a verb it means make a serious or urgent request, typically to the public.

"police are appealing for information about the incident"

as a noun it means a serious or urgent request, typically one made to the public.

"his mother made an appeal for the return of the ring"

Explanation:

hope it helps

The answers include the following:

Tendons are connective fibrous tissues that attaches muscle to bone and they have a bright white color together with a strong and smooth appearance which can be observed when studied.

Tendons are very important as they help in ensuring that the movement of parts of the body are easy due to its holding some structures such as ligaments in place. It is present in all bone joints due to its numerous functions in the musculoskeletal system of organisms.

The tendon is very flexible and binds the muscles in the body to other structures which is why it is referred to as a connective tissue and the above answers are the most appropriate.

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Answer:

it contains 30 orbitals

Answer:

300 meters for 30 seconds

Explanation:

10*30= 300 therefore giving you your answer.

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Answer:

The Earth's core is mainly made of iron and nickel.

Explanation:

Answer: The Earth's core is mainly made of iron and nickel.

Explanation:

Answer:

The fraction of original nuclei remaining is 1.5625

Explanation:

The amount of landfill space saved by recycling paper products in 2010 in the United States is 2.31 times the total amount of MSW recycled in that year.

To calculate the amount of landfill space saved by recycling paper products in 2010 in the United States, we need to find out the number of paper products that were recycled. We can do that by using the data on the total MSW recycled and the percentage of that which was accounted for by paper products.

Percentage of total MSW recycled accounted for by paper products in 2010 = 33%

Amount of landfill space saved per metric ton of paper products recycled = 7 m³

We need to determine the amount of landfill space saved by recycling paper products in 2010 in the United States.

Therefore, Let's assume that the total amount of MSW recycled in 2010 was x metric tons. Then, the number of paper products recycled = 33% of x= (33/100) x metric tons = 0.33x metric tons

Therefore,

The amount of landfill space saved by recycling paper products in 2010 = Amount of paper products recycled × Landfill space saved per metric ton of paper products recycled= 0.33x metric tons × 7 m³/metric ton= 2.31x m³

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Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

It should be B: 0.01 kJ

Answer:

Hey...The answer is B) 0.01 kJ

Answer:

b

Explanation:

edge 2021

According to the concept of conduction,heat  flows from faster molecules to slower molecules when they collide.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules .

There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

Heat is transferred from faster to slower molecules when they collide , thus the correct option is that heat flows from faster molecules to slower molecules when they collide.

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Answer:-

The chemical symbol for nitrogen is N2 the chemical formula for nitrogen gas is N2

Explanation:-

The chemical formula for nitrogen gas is N2. Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds.

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Answer: The molecular formula of nitrogen is N2.

Explanation: The atomic number of nitrogen is 7 as it is the 7th element of the periodic table and its molecular weight is 28.
nitrogen (N), a nonmetallic element of Group 15 [Va] of the periodic table. It is a colorless, odorless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter.

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A 30-day supply of Levoxyl at a dosage of one 13 μg tablet per day contains 0.39 mg of Levoxyl.

For a patient taking one 13 μg tablet of Levoxyl per day, the total amount of levothyroxine they are receiving is 13 micrograms. To calculate the total amount in a 30-day supply, we simply multiply this amount by 30.

13 μg/tablet x 1 tablet/day x 30 days = 390 μg

Note that the microgram (μg) is a unit of mass equal to one millionth of a gram, while the milligram (mg) is a unit of mass equal to one thousandth of a gram. To convert μg to mg, we divide by 1000:

390 μg / 1000 = 0.39 mg

Levoxyl is a medication used to treat hypothyroidism, a condition where the thyroid gland doesn't produce enough hormones to regulate the body's metabolism. The active ingredient in Levoxyl is levothyroxine sodium, which is a synthetic form of the hormone thyroxine (T4).

Levoxyl tablets are available in several strengths, ranging from 25 mcg to 300 mcg. The recommended dosage depends on the patient's age, weight, and the severity of their hypothyroidism. In general, adults with normal thyroid function usually require about 1.6 mcg of levothyroxine per kilogram of body weight per day.

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Answer:

Following are the solution to the given question:

Explanation:

Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.

Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.

Answer:

Explanation:

To solve this problem, we need to use the balanced chemical equation for the reaction between hydrobromic acid (HBr) and magnesium hydroxide (Mg(OH)2):

2HBr + Mg(OH)2 -> MgBr2 + 2H2O

From the equation, we can see that 2 moles of hydrobromic acid react with 1 mole of magnesium hydroxide.

We are given the volume of the hydrobromic acid as 5.0 mL, but we do not know the number of moles of hydrobromic acid present. However, we do know the concentration and volume of the magnesium hydroxide used for the titration. We can use this information to calculate the number of moles of magnesium hydroxide used in the titration:

Molarity of Mg(OH)2 = 1.50 M

Volume of Mg(OH)2 used = unknown (we don't know how much was added to reach the endpoint)

We can assume that the reaction between the two solutions goes to completion and that all the magnesium hydroxide reacts with the hydrobromic acid present. Therefore, we can set up the following equation using the stoichiometry of the reaction:

2 moles HBr = 1 mole Mg(OH)2

moles of HBr = (moles of Mg(OH)2) / 2

Using the equation for molarity (M = moles / liters), we can calculate the number of moles of magnesium hydroxide used in the titration:

Molarity of Mg(OH)2 = moles of Mg(OH)2 / volume of Mg(OH)2

moles of Mg(OH)2 = Molarity of Mg(OH)2 x volume of Mg(OH)2

We don't know the volume of Mg(OH)2 used, but we can use the volume of hydrobromic acid and the balanced chemical equation to determine it. Since 2 moles of HBr react with 1 mole of Mg(OH)2, we can say that:

moles of Mg(OH)2 = (moles of HBr) / 2

Using the equation for molarity and the given volume of hydrobromic acid (5.0 mL or 0.005 L), we can calculate the number of moles of hydrobromic acid present:

Molarity of HBr = moles of HBr / volume of HBr

moles of HBr = Molarity of HBr x volume of HBr

Now we can combine the equations to solve for the unknown volume of magnesium hydroxide used in the titration:

moles of Mg(OH)2 = (Molarity of Mg(OH)2) x (volume of Mg(OH)2)

moles of HBr = 0.5 x moles of Mg(OH)2 (since 2 moles of HBr react with 1 mole of Mg(OH)2)

moles of HBr = (Molarity of HBr) x (volume of HBr)

Since the moles of HBr are the same in both equations, we can set them equal to each other:

(Molarity of HBr) x (volume of HBr) = 0.5 x (Molarity of Mg(OH)2) x (volume of Mg(OH)2)

Solving for the unknown variable, we get:

(Molarity of HBr) = (0.5 x (Molarity of Mg(OH)2) x (volume of Mg(OH)2)) / (volume of HBr)

(Molarity of HBr) = (0

Answer:

0.45

Explanation:

We can calculate the probability of randomly selecting one button that is not white by using the formula:

Number of non-white buttons / Total Number of buttons.

We can calculate the number of non-white buttons with the information given by the problem:

# Non-White buttons = 4 + 6 = 10

Now we calculate the probability:

10 / 22 = 0.45

The probability is 0.45, or a 45% chance.

In the given reaction, aluminum (Al) was oxidized.

Oxidation is the loss of electrons, and reduction is the gain of electrons. In this reaction, aluminum (Al) goes from an oxidation state of 0 to +3, which means it loses three electrons. Therefore, aluminum is oxidized.

On the other hand, copper (\(Cu^{2+}\)) goes from an oxidation state of +2 to 0, which means it gains two electrons. Therefore, copper is reduced.

Remember, oxidation and reduction always occur simultaneously in a redox reaction. The species that loses electrons is oxidized, while the species that gains electrons is reduced.

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