For the Lewis structure above, how many lone pairs are on the P in PC13?
A. One
B. Three
C. Four
D. Two

Answer:

1.343 atm

Explanation:

We are given the following;

Pressure, p = ?

Volume v = 27 L

Mass of oxygen = 44.9 g

Temperature, T = 315 K

The formular relating all these variables is the equation;

PV = nRT

where R = gas constant = 0.08206 L atm / mole K

To obtain n, we use;

number of moles, n = Mass /  molar mass =  44.9 / 32 = 1.403 moles

From the ideal gas equation;

P = nRT / V

P = 1.403 * 0.08206 * 315 / 27

P = 36.27 / 27 = 1.343 atm

The pressure in a 27.0-L cylinder filled with 44.9 g of oxygen gas at a temperature of 315 K is 1.34atm

IDEAL GAS LAW:

PV = nRT

Where;

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Answer:

John Dalton

Explanation:

John Dalton in 1808 suggested that all matter consists of tiny particles called atoms and that the atoms of a specific element are identical.

He postulated the Dalton's atomic theory which has the following important parts;

Answer:

Copper

Explanation:

The given electronic configuration is of copper which sums upto 29  which is the atomic number of copper.

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:

I think it's lipid but if it's not it's dna

Explanation:

The other answer say carb and someone said it's wrong i picked amino acid on my test and it was wrong.

Answer:

2 AgNO₃(aq) + Ca(BrO₃)₂(aq) ⇒ Ca(NO₃)₂(aq) + 2 AgBrO₃(s)

2 Ag⁺(aq) + 2 NO₃⁻(aq) + Ca²⁺(aq) + 2 BrO₃⁻(aq) ⇒ Ca²⁺(aq) + 2 NO₃⁻(aq) + 2 AgBrO₃(s)

2 Ag⁺(aq) + 2 BrO₃⁻(aq) ⇒ 2 AgBrO₃(s)

Explanation:

The question is missing but I think it must be about the chemical equations.

Let's consider the molecular equation that occurs when a solution of silver nitrate and a solution of calcium bromate react.

2 AgNO₃(aq) + Ca(BrO₃)₂(aq) ⇒ Ca(NO₃)₂(aq) + 2 AgBrO₃(s)

The complete ionic equation includes all the ions and the insoluble species.

2 Ag⁺(aq) + 2 NO₃⁻(aq) + Ca²⁺(aq) + 2 BrO₃⁻(aq) ⇒ Ca²⁺(aq) + 2 NO₃⁻(aq) + 2 AgBrO₃(s)

The net ionic equation includes only the ions that participate in the reaction and the insoluble species.

2 Ag⁺(aq) + 2 BrO₃⁻(aq) ⇒ 2 AgBrO₃(s)

Answer: I saw the other question with screen shot Thanks

4. Answer, Like gases, plasmas have no fixed shape or volume, and are less dense than solids or liquids. But unlike ordinary gases, plasmas are made up of atoms in which some or all of the electrons have been stripped away and positively charged nuclei, called ions, roam freely.

5. Answer The energy associated with an object's motion is called kinetic energy. A speeding bullet, a walking person, and electromagnetic radiation like light all have kinetic energy. Another example of kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules.

6.Answer is solid

Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.

7. Answer Water behaves differently to most other substances because, in its solid state (ice), its particles are less densely packed than in its liquid state. This is why ice floats.

8. Answer 212 degrees F.

Sea Level: Water boils at 212 degrees F. and simmers at 190 degrees F.

9. Answer When an object is heated the motion of the particles increases as the particles become more energetic. If it is cooled the motion of the particles decreases as they lose energy.

10. Answer CHEMISTRY TERM                            PHASE CHANGE

Fusion/Melting Freezing Vaporization/Boilin    Condensation Sublimation Deposition                                                            Solid to a Liquid Liquid to a Solid Liquid to a Gas Gas to a Liquid Solid to a Gas Gas to a Solid

11.  Answer is Energy is consumed (endothermic) to melt ice (solid to liquid) so the opposite process (liquid to solid) must be exothermic.

12.In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.

ok alright. But where’s the question?

Answer:

Igneous rock

Explanation:

The rock held by Florian is already a metamorphic rock. On further subjection for heat and pressure, the rock will melt to become igneous rocks.

The equilibrium constant : K = d. 7.31 X 10¹⁵

Gibbs free energy is the maximum possible work given by chemical reactions at constant pressure and temperature. Gibbs free energy can be used to determine the spontaneity of a reaction

Reaction

SO₃ + H₂O ⇒ H₂SO₄ ΔG° = -90.5 kJ

Formula

[tex]\tt \Delta G^o=-RT~ln~K\\\\-90.5\times 10^3~J=-8.3145~J/mol.K\times 298~K~ln~K\\\\ln~K=36.5255\rightarrow K=e^{36.5255}=7.3\times 10^{15}[/tex]

Answer:

Pressure = 2324.08 mmHg

Explanation:

We are given

Volume = 10L

No of moles = 1.26

Temperature = 23degree = 296k

Pressure = ?

using the ideal gas equation

PV = nRT

P = nRT/V

P = [tex]\frac{1.26*0.082*296}{10}[/tex]  = 3.058atm

1 atm = 760mmHg

Pressure = 2324.08 mmHg

Answer:

Either 32.6 or 16.3

Explanation:

I just took the quiz and failed with the other two answers lol

Answer:

32.6 g Ag

Explanation:

Answer:

The energy associated with motion ends up as kinetic energy . The energy associated with position ends up as potential energy .

Explanation:

Answer:

28. Sodium Bromide

29. Calcium Chloride

30. Potassium Hydroxide

31. Copper (II) Nitrate

32. Silver Chromate

33. Ammonium Perchlorate

The molarity of the solution formed by dissolving 45 g of NaOH in water to give a final volume of 250 mL is 4.5 M

We'll begin by calculating the number of mole in 45 g of NaOH. This can be obtained as follow:

Mass of NaOH = 45 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mole = mass / molar mass

Mole of NaOH = 45 / 40

Mole of NaOH = 1.125 mole

Volume = 250 mL = 250 / 1000 = 0.25 L

Molarity = 1.125 / 0.25

Therefore, the molarity of the solution is 4.5 M

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Answer:

Structure 1 formal charges:

N₁ = +1; O₁₁ = +1; O₁₂ = -1; N₂ = 0; N₃ = +1; O₃₁ = -1; O₃₂ = -1

Structure 2 formal charges:

N₁ = +1; O₁₁ = +1; O₁₂ = -1; N₂ = -1; N₃ = +1; O₃₁ = -1; O₃₂ = +1

Structure 3 formal charges:

N₁ = +1; O₁₁ = -1; O₁₂ = -1; N₂ = +1; N₃ = +1; 0₃₁ = -1; O₃₂ = -1

Explanation:

The formal charge of an atom in a molecule is the charge assigned to the atom if the electrons in all chemical bonds were redistributed evenly between the atoms.

Formal charge can be calculated as follows:

Formal charge =  number of valence shell electrons in the neutral atom − ( number of lone pair electrons + ½ bonding electrons)

Structure 1:

N₁ = 5 - 4 = +1

O₁₁ = 6 - 5 = +1

O₁₂ = 6 - 7 = -1

N₂ = 5 - 5= 0

N₃ = 5 - 4 = +1

O₃₁ = 6 - 7 = -1

O₃₂ = 6 - 7 = -1

Structure 2:

N₁ = 5 - 4 = +1

O₁₁ = 6 - 5 = +1

O₁₂ = 6 - 7 = -1

N₂ = 5 - 6= -1

N₃ = 5 - 4 = +1

O₃₁ = 6 - 7 = -1

O₃₂ = 6 - 5 = +1

Structure 3:

N₁ = 5 - 4 = +1

O₁₁ = 6 - 7 = -1

O₁₂ = 6 - 7 = -1

N₂ = 5 - 4 = +1

N₃ = 5 - 4 = +1

0₃₁ = 6 - 7 = -1

O₃₂ = 6 - 7 = -1

Explanation:

Calcium hydroxide  = Ca(OH)₂

Water  = H₂O

An Arrhenius base is a substance which interacts with water to yield excess hydroxide ions, OH⁻ in an aqueous solution.

  The reaction in water;

           Ca(OH)₂   →  Ca²⁺  + 2OH⁻

The medium of this reaction is water.

0.010 g would be left after 50,000 years

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

t1/2=5730 years

t=50,000 years

No=4.3 g

[tex]\tt Nt=4.3\dfrac{1}{2}^{50000/5730}\\\\Nt=4.3.\dfrac{1}{2}^{8.73}\\\\Nt=0.010~g[/tex]

Explanation:

hsbus r did iedj iadj sis aj sis dj akd bzaid ks akr ka he k sits wk do that s

Answer:

C. the uneven heating of Earth's surface

Answer: Wheel and Axle

Both of these work together to form a simple machine. You can't have one without the other.

If you try to turn just the axle itself, then you'll find it takes a lot of work. This is because the inertia of the axle wants to keep the object at rest. Also, you won't have a lot of torque due to the small radius compared to what a doorknob can offer.

Using a doorknob is like putting a (steering) wheel on an axle. This increases the radius and therefore increases the torque. You put in less work into the system and get more out of it.

Answer:

A= Metallic

B= Conducts electricity as a solid

C= Covalent

D=Does not conduct electricity

Explanation:

The whole Activity , poem and paragraph is missing in the question.

Answer:

(1) Liquid A

(2) Solid A

Explanation:

Using this part of the given poem

Substances and mixtures behave differently,

During boiling and melting most especially

Boiling point of substance is fixed while mixture is not

Substance melts completely but mixture does not

The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A

Solid A is melting completely so Solid A is a pure substance.

To find the number of moles of Alanine, we first need to find its molar mass

Finding the Molar mass:

To our convenience, we are already given the chemical formula of Alanine

Chemical formula:  C₃H₇NO₂

Now, we will use this formula to find the molar mass of Alanine

to do that, we will replace the chemical symbols of elements with their respective molar masses and add them together

We know the following molar masses:

C is 12 g/mol

H is 1 g/mol

N is 14 g/mol

O is 16 g/mol

Now, we will replace the chemical symbols with their molar mass and will be multiplied by their values in subscript

C₃H₇NO₂

Molar mass = (12)*3  + (1)*7 + (14)*1 + (16)*2

Molar mass = 36 + 7 + 14 + 32

Molar mass = 89 grams/mol

Number of moles of Alanine in a 159 gram sample:

Number of moles = Given mass / Molar mass

Number of moles = 159 / 89

Number of Moles = 1.78 moles

The question is incomplete, the question is;

Which drawing best accounts for the polarity of methanol, CH3OH, and the bond polarities that make a major contribution to the overall molecular polarity?

A) drawing (1)                                  B) drawing (2)

D) drawing (4)                                  C) drawing (3)

Answer:

   B) drawing (2)

Explanation:

In Chemistry, the direction of dipole is shown from positive end to negative end.

The image that contains the options in the question asked has been attached.

We can see in image 2 that the oxygen atom was correctly designated as the negative end of the dipole while the carbon and hydrogen atoms were each designated as positive ends of the dipole in accordance with the magnitude of electronegativity difference between the two atoms. The net dipole moment is now taken in the direction shown in image 2. This is the correct answer.

Drawing 2 best accounts for the polarity of methanol, CH3OH. Therefore, the correct option is B.

A carbon atom (C) joins with three hydrogen atoms (H), a hydroxyl group (OH), and three other atoms to form methanol (CH3OH). An oxygen atom (O) is attached to a hydrogen atom to form a hydroxyl group. The three hydrogen atoms and hydroxyl groups are arranged in three dimensions, giving the molecular structure of methanol a tetrahedral form around the core carbon atom.

A polar covalent bond is formed between oxygen and hydrogen because the oxygen atom in the hydroxyl group is more electronegative than the carbon and hydrogen atoms. Due to the unequal sharing of electrons, oxygen has a partial negative charge (-) and hydrogen has a partial positive charge (+), resulting in this polarity.

So, the correct option is B.

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Your question is incomplete, most probably the complete question is:

Which drawing best accounts for the polarity of methanol, CH3OH, and the bond polarities that make a major contribution to the overall molecular polarity?

A) drawing (1)                                  B) drawing (2)

D) drawing (4)                                  C) drawing (3)

Answer:

28 g/mol, N2

Explanation:

Given data:

Volume of gas = 5.0 L

Mass of gas = 6.3 g

Pressure = 1 atm

Temperature = 273 K

Molar mass of gas = ?

Solution:

We will calculate the density first.

d = mass/ volume

d = 6.3 g/ 5.0 L

d = 1.26 g/L

Molar mass:

d = PM/RT

M = dRT/P

M =  1.26 g/L× 0.0821 atm.L/mol.K × 273 K/ 1 atm

M = 28 g/mol

Molar mass of N₂ is 28 g/mol thus given gas is N₂.

rate He = 6 x rate SF₆

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

or  

[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]

M He = 4 g/mol

M SF₆ = 146 g/mol

[tex]\tt \dfrac{r_{He}}{r_{SF_6}}=\sqrt{\dfrac{146}{4} }=6.04\approx 6\\\\r_{He}=6~r_{SF_6}[/tex]

Answer:

Fluorine has a higher electronegativity than carbon

Explanation:

Electronegativity trend

-As you go from left to right across the periodic table, the electronegativity increases.

-As you go from top to bottom, the electronegativity decreases.

-We know that both carbon and fluorine are in the same energy level or period 2. However, Carbon is in group 14, which has 4 valence electrons, while fluorine is in group 17, which has 7 valence electrons. Therefore, fluorine has a higher electronegativity because fluorine is desperately wanted to gain 1 more valence electron to become stable (octet rule).

Answer:

the answer is C

Explanation:

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Answer: It will very well be C.

Explanation: