Sally does the work in 2.3 hours and Pete does 2.5

This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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Answer:

0.43×10²³ atoms

Explanation:

Given data:

Mass of LiBrO₂ = 4.28 g

Number of atoms of oxygen = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 4.28 g/ 118.84 g/mol

Number of moles = 0.036 mol

We can see 1 mole of LiBrO₂ contain 2 mole of oxygen atm.

0.036 mol × 2 = 0.072 mol

1 mole contain 6.022×10²³ atoms

0.072 mol × 6.022×10²³ atoms / 1mol

0.43×10²³ atoms

An example of an exothermic reaction is when metals react with oxygen to form metal Oxides

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Miscible liquids are separated via a kind of distillation called fractional distillation. he mixture is typically divided into component parts after a series of distillations and condensations.

Miscible liquids are separated via a kind of distillation called fractional distillation. The mixture is typically divided into component parts after a series of distillations and condensations. When the combination is heated to a specific temperature where some of the mixture begins to vaporise, the separation takes place.

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Answer:

176.9 g/mol

Explanation:

You have to add the molar masses of the constituent atoms. The molar mass of palladium is 106.42 g/mol and the molar mass of chlorine is 35.45g/mol so 106 + 2(35.45) = 176.9 g/mol

Answer: The answer is incus

Answer:

As you travel away from the Earth's surface, your mass stays the same but your weight reduces as gravitational pull decreases. For example, an astronaut orbiting the Earth and floating weightlessly in the cabin still has the same mass.

Explanation:

Answer: B. 430 K

Explanation:

According to Gibb's equation:

\(\Delta G=\Delta H-T\Delta S\)

\(\Delta G\) = Gibbs free energy  

\(\Delta H\) = enthalpy change  = +62.4 kJ/mol

\(\Delta S\) = entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

\(\Delta G\)  = +ve, reaction is non spontaneous

\(\Delta G\)  = -ve, reaction is spontaneous

\(\Delta G\)  = 0, reaction is in equilibrium

\(\Delta H-T\Delta S=0\) for reaction to be spontaneous

\(T=\frac{\Delta H}{\Delta S}\)

\(T=\frac{62.4kJ/mol}{0.145kJ/molK}=430K\)

Thus the Reaction is spontaneous when temperature is 430 K.

Answer:

430 K

Explanation:

i just took the test on a pex :)

Answer:

the enthalpy of the second intermediate equation is halved and has its sign changed.

Explanation:

Let us take a look at the first and second intermediate reactions as well as the overall reaction equation for the process under review;

First reaction;

Ca (s) + CO₂ (g) + ½O₂ (g) → CaCO₃ (s) ΔH₁ = -812.8 kJ

Second reaction;

2Ca (s) + O₂ (g) → 2CaO (s) ΔH₂ = -1269 kJ

Hence the overall equation is now;

CaO (s) + CO₂ (g) → CaCO₃ (s) ΔH = ?

According to the Hess law of constant heat summation, the enthalpy of the overall reaction is supposed to be obtained as a sum of the enthalpy of both reactions but this will not give the enthalpy of the overall reaction in this case. The enthalpy of the overall reaction is rather obtained by halving the enthalpy of the second intermediate reaction and reversing its sign before taking the sum as shown below;

Enthalpy of Intermediate reaction 1 + ½(- Enthalpy of Intermediate reaction 2) = Enthalpy of Overall reaction

Answer:

A.

Explanation:

Did it on Edge.

Answer:

[Cd²⁺] = 2.459x10⁻⁶M

Kf = 9.96x10⁶

Explanation:

Solubility of CdC₂O₄ is 6.1x10⁻³M and ksp is 1.5x10⁻⁸

The ksp of CdC₂O₄ is:

CdC₂O₄(s) ⇄ Cd²⁺(aq) + C₂O₄²⁻(aq)

ksp = [Cd²⁺] [C₂O₄²⁻] = 1.5x10⁻⁸

As solubility is 6.1x10⁻³M, concentration of C₂O₄²⁻ ions is 6.1x10⁻³M. Replacing:

[Cd²⁺] = 1.5x10⁻⁸ / [6.1x10⁻³M]

All Cd²⁺ in solution is 6.1x10⁻³M and exist as Cd²⁺ and as Cd(NH₃)₄²⁺. That means concentration of Cd(NH₃)₄²⁺ is:

[Cd(NH₃)₄²⁺] + [Cd²⁺] = 6.1x10⁻³M

[Cd(NH₃)₄²⁺] = 6.1x10⁻³M - 2.459x10⁻⁶M = 6.098x10⁻³M

In the same way, the whole concentration of NH₃ in solution is 0.150M, as you have 4ₓ6.098x10⁻³M = 0.024M of NH₃ producing the complex, the concentration of the free NH₃ is:

[0.150M] = [NH₃] + 0.024M

The equilibrium of the complex formation is:

Cd²⁺ + 4 NH₃ → Cd(NH₃)₄²⁺

The kf, formation constant, is defined as:

Kf = [Cd(NH₃)₄²⁺] / [Cd²⁺] [NH₃]⁴

Replacing:

Kf = [6.098x10⁻³M] / [2.459x10⁻⁶M] [0.1256M]⁴

Answer:

C. Two hexagon rings with carbons at each corner have alternating double bonds and share one side. H is single bonded to all the C's except the ones on the shared side

Explanation:

The structure of aromatic hydrocarbon contain benzene (C6H6) which is a cyclic hydrocarbon.

Alternating single and double bond at each corner of two hexagon rings is an aromatic hydrocarbon as the alternating single and double bond form a benzene ring and H is single bonded to all the carbon's (C) except on the shared side.

Hence, the correct answer is "C"

Answer:

if you look up "propyne hydrocarbon" online, the model of D should pop up!

H - C = C - C - H

Middle C after "=" should have H on both sides (top and bottom)

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of seawater = 600 mL

density = 1.025 g/mL

The mass is

mass = 600 × 1.025

We have the final answer as

Hope this helps you

Answer:

HBr+LiOH->H2O+LiBr

Explanation:

Hydrogen and Lithium ions have a charge of +1, Bromine and Hydroxide ions have a charge of -1. Therefore, the result.

Patrick is a 16 year old boy whose body has stopped producing osteoclasts this means for his bones that his bones will become weak and brittle and other part of his body like the hip and wrist and spine will be affected by this

Osteoclast weaken brittle bones and making them prone to breaking from even minor stresses like coughing or stopping and the most frequent location for fracture caused by osteoclasts are the hip writ and spine and bone is a living tissue that constantly degrade and is replaced and by increasing their resorptive activity and destroying bone to initiate normal bone repair and the cell known as osteoclasts mediate bone loss in pathogenic circumstances

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Answer:

Explanation:

the SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second, and is equivalent to 100,000 dynes.

Answer:

the concentration of O2 and SO2 would increase.

Explanation:

As it is an exothermic reaction,there is release of energy.To balance that energy ,the equilibrium will shift towards reactant side when there is increase in temperature.Hence,the reaction concentration that is SO2 and O2 will increase.

Hope this helps....

Good luck on your assignment......

Answer:

When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite. Every carbon atom is covalently bonded at the four corners of the tetrahedron to four other carbon atoms.

Answer:

Explanation:

When 2-methyl butane (also known as isopentane) is monochlorinated, the chlorine atom can substitute for the hydrogen atom at various places along the carbon chain, resulting in the generation of several isomers.

There are four distinct hydrogen atoms accessible for replacement in 2-methyl butane: one at the methyl group (C2) and three at the carbon chain (C3, C4, and C5).

Each of these hydrogen atoms can be replaced by a chlorine atom, yielding four distinct monochlorinated isomers.

As a result, the total number of isomers generated when 2-methyl butane is monochlorinated is four.

Answer:

c. Tomatoes, chocolate, and a desk

Explanation:

All are composed of atoms

Sunlight has no atoms, only photons

Sound has no atoms, only energy

Electricity has no atoms, movement of electrons or positrons, not full atoms.

25.0grams of bromine is equivalent to 1.881 × 10²³ molecules.

The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number (6.02 × 10²³).

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³. By definition, it is the number of elementary entities (atoms or molecules) comprising one mole of a given substance.

According to this question, sodium is combined with bromine to produce sodium bromide. If one uses 25.0g of bromine, the number of moles of bromine used is as follows:

no of moles = 25.0g ÷ 80g/mol

no of moles = 0.3125moles

no of molecules = 0.3125 × 6.02 × 10²³ = 1.881 × 10²³ molecules

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Answer: Fluorine

Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.

Answer:

Fluorine.

Explanation:

I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.

The electronegativity of the connecting atoms determines whether a bond is nonpolar or polar covalent.

What is electronegativity?

The tendency of an atom to draw electrons (or electron density) to itself is measured by its electronegativity. It controls the distribution of the shared electrons between the two atoms in a bond.

The bigger an atom's electronegativity, the more aggressively it will draw electrons from its bonds. The more electronegative atom is the one with the partial negative charge because electrons in a polar covalent connection are moved toward it.

The electron distribution will be more polarized and the atoms' partial charges will be larger the greater the difference in electronegativity.

Therefore, The electronegativity of the connecting atoms determines whether a bond is nonpolar or polar covalent.

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Explanation:

The stovetop example would be an open system, because heat and water vapor can be lost to the air. A closed system, on the other hand, can exchange only energy with its surroundings, not matter.

Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.

The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.

The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.

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Answer:

they physical quantities that are uneffected by changes to a vector space basis

As a result, when a substance absorbs enough energy then its atoms or molecules move around. And, when increase in this energy takes place then atoms tend to collide frequently with each other. Hence, it causes change in state of a substance. Therefore, changes in matter are important for the conservation of energy

mark brainliest if right

Answer:

u didn't give us the multiple hoice answer

Explanation:

Answer:

Here are the answer choices

Explanation:

A) Compounds contain atoms of at least two different elements.

B) Each element is made up of atoms.

C) Each element contains atoms with negatively charged particles.

D) Atoms within the same element have the same amount of mass.

Answer:

Michal Faraday 19th century