Which sentence best explains the observed trend in atomic radius as you
move down the periodic table?
OA. The more energy levels that are occupied by electrons, the larger
the atomic radius.
OB. The more neutrons a nucleus has, the larger the atomic radius.
OC. The more paired electrons there are, the smaller the atomic radius.
D. The more core electrons an atom has, the smaller the atomic
radius.
SUBMIT

Answer:

Its B

Explanation:

I just took the quiz.

When \(CH_{3} Br\) and OH collide in order to react and form \(CH_{3} OH\) , such reaction will be best represented by diagram (B).

A chemical reaction would be a procedure that causes one group of chemical components to change chemically into another. In a chemical reaction, one or even more substances also known as reactants would be changed into one or more additional materials known as products. Chemical elements and chemical compounds make up substances.

A colloid would be a mixture wherein the component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component.

When

\(CH_{3} Br + OH\) → \(CH_{3} OH + Br\).

By the Collison of  methyl bromide with OH ion then methyl alcohol will be formed.

Therefore, when \(CH_{3} Br\) and OH collide in order to react and form \(CH_{3} OH\) , such reaction will be best represented by diagram (B).

Therefore, the correct answer will be option (B).

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The abbreviated electron configuration for Al2+ is [Ne]3s2 3p1

since Al has 13 electrons :  [Ne]3s2 3p1

Al2+ means it has lost 2 electrons to become :  [Ne]3s1

Electronic configurations in chemistry can be describe as the way each electron move independently in an orbital, in an average field created by all other orbitals. which also means  the arrangement of electrons in orbitals around an atomic nucleus.

An electron in simple term is a negatively charged subatomic particle that binds together with protons and neutrons  to form an atom's nucleus. it can also be seen as a tiny particle of matter that is smaller than an atom and has a negative electrical charge in it.

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Answer:

18.75 moles of O2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

NH3 + O2 —> NO + H2O

There are 3 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of NH3 and 6 in front of H2O as shown below:

4NH3 + O2 —> NO + 6H2O

There are 4 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NO as shown below:

4NH3 + O2 —> 4NO + 6H2O

Now, there are a total of 10 atoms of O on the right side and 2 atoms on the left side. It can be balance by putting 5 in front of O2 as shown below:

4NH3 + 5O2 —> 4NO + 6H2O

Now the equation is balanced.

Now, we can determine the number of moles of oxygen consumed for every 15.0 moles of NO produced as follow:

4NH3 + 5O2 —> 4NO + 6H2O

From the balanced equation above,

5 moles of O2 were consumed to produce 4 moles of NO.

Therefore, Xmol of O2 will be consume to produce 15 moles of NO i.e

Xmol of O2 = (5 x 15)/4

Xmol of O2 = 18.75 moles.

Therefore, 18.75 moles of O2 is consumed for every 15 moles of NO produced.

Answer:

CaCO3 (s) + 2HCl(aq) → CaCl2 (s) + H2O(aq) + CO2(g). The principle of mass conservation is essential for balancing chemical equations.

Chemical Reaction TypesSynthesis processes reactions of decomposition.responses with only one substitution.reactions involving two replacements.

Double displacement reactions often occur in aqueous solutions where there is an ion exchange and ion precipitation.For instance, a white precipitate containing barium sulphate forms right away when a solution containing barium chloride and sodium sulphate is combined.These are ionic-based reactions.

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Answer:

The correct answer is "0.31 M".

Explanation:

Given,

Volume,

\(V_1=340\)

\(V_2=560\)

Molarity,

\(M_1=0.5\)

Let the M₂ be "x".

By using the dilution formula, we get

⇒ \(M_1V_1=M_2V_2\)

then,

⇒ \(0.5\times 340=x\times 560\)

⇒          \(170=x\times 560\)

⇒             \(x=\frac{170}{560}\)

⇒                \(=0.31 \ M\)

The characteristics of the conservation of energy and momentum allow to find the result for the movement of the balls, the correct answer is:

      D. The mechanical energy of the ball on the left is transferred through

the other balls to the ball on the right.

Mechanical energy is the sum of the kinetic energy and the potential energies. In the case that there is no friction, the mechanical energy is conserved.

The momentum is defined by the product of the mass and the velocity of the body, in an isolated system the momentum is conserved and the shocks can be of two types:

In the case indicated, when removing the ball, it gains a height, therefore if the initial mechanical energy is

          Em₀ = mgh

When it reaches the lowest point, just before it hits the ball its energy is:

           \(Em_f\) = 1 / 2m v²

          Em₀ = Em_f

          v = \(\sqrt{2gh}\)  

collides with the other ball and transfers its momentum in an elastic collision, the balls do not stick, as all the energy of the ball is kinetic, this energy is transferred to each ball until it reaches the last one, where the kinetic energy is transformed into potential energy a increases its height.

Let's analyze the answers:

A. False. This is a collision of particles there are no waves.

B. False. At the lowest point the ball on the left has kinetic energy.

C. False. It is a collision of particles, there are no waves.

D. True. The energy from the elastic collisions is transferred through each ball until it reaches the last ball.

In conclusion, using the characteristics of the conservation of energy and momentum, we can find the result for the movement of the balls, the correct answer is:

      D.  The mechanical energy of the ball on the left is transferred through the other balls to the ball on the right

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Answer:

The enthalpy change of the reaction is 4.78 × 10⁴ J.

Explanation:

We are given that 0.717 g of sodium metal reacts with hydrochloric acid to produce 7450 J of heat.

Converting grams of sodium to moles:

\(\displaystyle 0.717 \text{ g Na} \cdot \frac{1 \text{ mol Na}}{22.99 \text{ g Na}} = 0.0312 \text{ mol Na}\)

And dividing the amount of heat produced by the moles of sodium reacted yields:

\(\displaystyle \Delta H = \frac{7450 \text{ J}}{0.312 \text{ mol Na}} = 2.39 \times 10^4 \text{ J/mol Na}\)

Because the given reaction has two moles of sodium metal, we can multiply the above value by two to acquire the enthalpy change of the given reaction:

\(\displaystyle \Delta H = 2\text{ mol Na}\left(2.39 \times 10^4 \text{ J/mol Na}}\right) = 4.78 \times 10^4 \text{ J}\)

In conclusion, the enthalpy change of the reaction is 4.78 × 10⁴ J.

The name of \(H_{3} PO_{4}\) is Phosphoric acid.

Phosphoric acid (orthophosphoric acid, mono-phosphoric acid, or phosphoric(V) acid) is an inorganic phosphorus-containing solid with the chemical formula \(H_{3} PO_{4}\). It is most commonly encountered in the form of an 85% aqueous solution, which is a colorless, odorless, non-volatile syrupy liquid. It is a significant industrial chemical that is found in many fertilizers.

The term "orthophosphoric acid" is used to differentiate this acid from other "phosphoric acids," such as pyrophosphoric acid. Nonetheless, the term "phosphoric acid" is frequently used to refer to this specific compound, and this is the current IUPAC nomenclature.

Food-grade phosphoric acid is used to acidify foods and beverages like colas and jams, giving them a tangy or sour flavour. Phosphoric acid is also used as a preservative. Soft drinks containing phosphoric acid, such as Coca-Cola, are sometimes referred to as phosphate sodas or phosphates. Soft drinks contain phosphoric acid, which has the potential to cause dental erosion.

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Answer:.

Explanation: Matter must have Mass and Volume to be considered matter!

The reaction rate to the nearest whole number is 36.1 mg/l/sec.

To calculate the reaction rate we would use the formula already provided which is: mass of tablet/volume of water ÷ Reaction time.

For the tablet with a 3°C Reaction time, we would calculate the rate as follows:

1000 mg * 0.2L/138.5 sec = 36.1 mg/L/sec.

The final result has all three variables and the resulting answer is the reaction rate.

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Complete Question:

Assume that each tablet's mass was 1,000 mg, and remember that you used 0,200 L of water each time,

Compute the reaction rate to the nearest whole number using the formula below,

mass of tablet/volume of water

Reaction Rate = mass reaction time

3°C Reaction time = 138.5 sec

Reaction rate = mg/l/sec

Answer:

The balanced chemical equation is:

Mg_((s))+ 2HCl_((aq))rarrMgCl_(2(aq)) + H_(2(g)

Explanation:

The reaction between magnesium and hydrochloric acid combine to form a salt of magnesium chloride and release hydrogen gas. This single replacement reaction is a classic example of a metal reacting in an acid to release hydrogen gas.

Answer:

Hi! there

Explanation:

Heroine is a opiate drug that is synthesized from morphine . Morphine is a naturally ocurring substance found in the seed of the Asian poppy plant.

        yes, heroine change appetite . One of the noticeable side effect is rapid change in body weight . It can cause both dramatic increases and decreases in appetite and weight depending on the individual through its effects on the GI  system - like appetite changes and nausea or vomiting , excessive sleeping , restlessness etc .

Hope that you like it ! Thankyou

Answer:

A)  There is an inverse relationship between stream velocity and incline of the

stream table.  The greater the incline of the stream table, the greater the velocity of the

stream.

Explanation:

I believe this to be the answer.

Answer: The greater the velocity of moving water, the greater the kinetic energy and the more sediment moved to the mouth.

Explanation: I took the test

Answer:

group 17 the halogen.as it has 7 electron in its outermost ring

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Answer:

humans have a huge impact on all spheres. if you negatively impact the spheres, such as burning fossil fuels, it'll pollute the atmosphere.

Explanation:

All four spheres of Earth are susceptible to human influence. Burning fossil fuels can cause pollution to be released into the atmosphere. Garbage accumulated by humans in landfills has an impact on the geosphere. Human waste enters waterways and has an effect on the hydrosphere.

Different definitions of the geosphere have conflicting uses. It can be used to refer to the atmosphere, lithosphere, hydrosphere, and cryosphere as a whole. Different mass and/or energy flows can be exchanged between the various geosphere collectives.

Land erosion and soil movement currently result from human activity more frequently than from any natural mechanism. Human-caused air and water pollution has a negative impact on the environment, rivers, and lakes, harming both other animals and people's health.

According to some scientists, humans have their own sphere, the "anthrosphere." But for the purposes of this module, people will also be considered a component of the biosphere.

Thus, Garbage accumulated by humans in landfills has an impact on the geosphere.

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E⁣⁣⁣⁣xplanation i⁣⁣⁣⁣s i⁣⁣⁣⁣n a f⁣⁣⁣⁣ile

bit.\(^{}\)ly/3a8Nt8n

The molar mass of the sugar is obtained as  1.43 g/mol.

We know that the boiling point of a substance is one of the properties of the substances that could be called the colligative properties since they can be affected by the number of particles present.

We are told that the mass concentration of the substances w/w of the solution is 17% thus we have 17 g of the compound and 83 g of water. We can now get the number of moles of the substance as;

Number of moles = ?

Mass of the solution = 1000 mL * 1.015 g/mL = 1015 g or 1.015 Kg

Given that;

ΔT = K m i

ΔT = Boiling point elevation

K = Boing constant of water

m = molality of the solution

i = Van't Hoff factor

ΔT = 106 °C - 100°C

= 6 °C

Then;

6 = 0.515 *  17/MM * 1/1.015 * 1

Where MM = molar mass of the sugar

6 = 0.515 * 17/1.015 MM * 1

6 = 0.515 * 17/1.015 MM

6 = 8.755/1.015 MM

6 * 1.015 MM =  8.755

MM =  8.755/6 * 1.015

MM = 1.43 g/mol

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Answer:

Strong winds that blow for a long time over a great distance.

Explanation:

Generally, the biggest and most powerful wind-generated waves are produced by strong storms that blow for a sustained period over a large area. Huge and big waves, or swells, can travel over long distances. The size of the wave depends on wind speed, wind duration, and the area over which the wind is blowing. If The speed of the wind is more, it stays for along time and it covers a larger distance then the waves produced will be very powerful and large.

Answer:

Normal weather is like rn with no hurricanes or anything dangerous

Severe weather, is a weather that is that can cause a lot of harm.

Answer:

The balanced chemical equation:

3 NH₃ + H₃PO₄ → (NH₄)₃PO₄

From the equation we see:

3 moles of NH₃ gives 1 mole (NH₄)₃PO₄

0.085 mole NH₃ will gives ?? mole (NH₄)₃PO₄

By cross multiplication:

number of moles of (NH₄)₃PO₄ = 0.085 * 1/3 = 0.028 mole

Explanation:

pray for my test on monday❤️

Answer:

the answer is TRUE, there ARE more protons than electrons in a negatively charged atom.

Explanation:

I took the "03.01 Atomic Theory test" too :)

Answer:

It is false

Explanation:

I took the test

The mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

The given chemical reaction;

\(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\)

In the given compound above, we can deduce the following;

60 g of \(SiO_2\)  --------- 36 g of water

23 g of \(SiO_2\)  ------------- ? of water

\(mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water\)

Thus, the mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

In the reaction of the given compound, \(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\), what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

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The atomic mass of Aluminum is 23, which means it has a total of 23 particles in its nucleus, including protons and neutrons.

Aluminum has an atomic number of 13, which means it has 13 protons in its nucleus.

To find the number of neutrons, we subtract the atomic number from the atomic mass. So, Aluminum has 23 - 13 = 10 neutrons in its nucleus. Electrons are the negatively charged particles that orbit around the nucleus of an atom.

Aluminum, being a neutral atom, has an equal number of electrons to the number of protons in its nucleus, which is 13. These electrons are distributed in different energy levels or shells around the nucleus.

Aluminum is a widely used metal in different applications due to its unique properties such as low density, high strength, and resistance to corrosion. It is used in the manufacturing of cans, foils, and aircraft parts. The number of protons and electrons determines the atomic number and chemical properties of an element. The number of neutrons affects the stability and isotopes of an element.

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According to the description of an ionic bond, the last choice is the right response: Ca and Br are the two components that will combine to form an ionic connection. Bromine gets electrons quickly whereas calcium loses them easily.

Between metallic and non-metallic atoms, an ionic bond is created in which all of the electrons from one atom are transferred to the other. One atom loses electrons and another receives them during this process, resulting in the formation of ions.

In general, nonmetals are willing to take electrons to form anions while metal elements are willing to donate them to make cations.

On the other hand, the octet rule describes an attribute of atoms that they require eight electrons to complete their final energy level in order to ensure stability. The noble gases that have served as the foundation for this rule.

In order to adhere to the octet rule and ensure that the elements are stable, electrons are transferred in the ionic connection in this manner.

Ca and Br are the two elements that will combine to form an ionic connection because Ca is a metal and will give electrons while Br is a non-metal and will accept them.

The final option, Ca and Br, is the pair of elements that will form an ionic bond, making it the correct response. Bromine gets electrons quickly whereas calcium loses them easily.

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