Which of the following is a polar substance?
O Water
O Grease
O Gasoline
O Oil

Answer:

sorry i didn't understand your question can you explain me your question have a good day hope its helps you ☺

Answer:

1. 80.9 g of CH₃OH

2. CO

3. 5.14moles

Explanation:

The reaction is:

CO  +  2H₂  →  CH₃OH

First place, we determine the moles of each reactant.

70.8 g . 1mol/ 28g = 2.53 moles of CO

20.4 g . 1mol / 2g = 10.2 moles of H₂

There is too much hydrogen, so the limiting reactant might be the carbon monoxide.

2 moles of H₂ react to 1 mol of CO

Then, 10.2 moles of H₂ may react to (10.2 . 1) /2 = 5.1 moles

We don't have enough CO, so it's ok that CO is the limiting. (We have 2.53 moles, we need 5.1 moles)

In the other hand, hydrogen is the excess reactant.

1 mol of CO react to 2 moles of hydrogen

2.53 moles may react to (2.53 . 2) /1  =5.06 moles

We have 10.2 moles, and we need 5.06 moles. Then (10.2 - 5.06) = 5.14 moles remains after the reaction goes complete.

Now that we know the limiting reactant, we can determine the grams of produced methanol. Ratio is 1:1

1 mol of CO produces 1 mol of CH₃OH

2.53 moles of CO must produce 2.53 moles of CH₃OH

We convert moles to mass: 2.53 mol . 32 g/mol = 80.9 g

Answer: A wire the first answer gl on the quiz

Answer:

Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)

Explanation:

Given:

Amount of calcium (Ca) = 20.5 grams

Find:

Number of moles in 20.5 grams of calcium (Ca)

Computation:

Number of moles = Gram weight / Atomic weight of substance

We know that, Atomic weight of calcium (Ca) is 40.078 u

Number of moles in 20.5 grams of calcium (Ca) = Amount of calcium (Ca) / Atomic weight of calcium (Ca)

Number of moles in 20.5 grams of calcium (Ca) = 20.5 / 40.078

Number of moles in 20.5 grams of calcium (Ca) = 0.511

Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)

Answer:

5.4

Explanation:

The lower the pH the more H3o+ ions there are

Answer:

reactivity, flammability, and if they rust

Answer:

Just use a text book.. So that you get the concept

Hence, [tex]C_{20}H_{20}O_4[/tex] is the molecular formula of a compound's empirical formula is [tex]C_5H_5O[/tex].

The empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms.

Divide the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiply all the subscripts in the empirical formula by the whole number

The molar mass of the empirical formula compound [tex]C_5H_5O[/tex] is 46.06844 g/mol.

The molecular mass of the compound is 162.2g given.

162.2g ÷ 46.06844

3.520848546 =4

[tex]C_{20}H_{20}O_4[/tex] is the molecular formula.

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Answer:

Al(OH)3 (s) + 3H+ (aq) → 3H2O (l) + Al3+ (aq)

Explanation:

The net ionic equation for the reaction between solid Al(OH)₃ and aqueous nitric acid, HNO₃ is

The reaction between Al(OH)₃ and HNO₃ will proceeds as follow:

HNO₃ (aq) —> H⁺(aq) + NO₃¯(aq)

HNO₃ (aq) + Al(OH)₃ (s) —>

H⁺(aq) + NO₃¯(aq) + Al(OH)₃ (s) —> H₂O(l) + NO₃¯(aq) + Al³⁺(aq)

Cancel the spectator ion (i.e NO₃¯)

H⁺(aq) + Al(OH)₃ (s) —> H₂O(l) + Al³⁺(aq)

Write 3 before H⁺ and H₂O to obtain the balanced ionic equation as shown below:

3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)

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Explanation:

ni suna ham naHow many of each type of atom should react so that the electrons

lost will equal the electrons gained?

Answer:

Thermal energy is transferred between particles that are in direct contact with each other.

Thermal energy is transferred between objects of different temperatures.

Thermal energy is transferred from fast-moving particles to slow-moving particles.

Explanation:

Answer:mmhm

Explanation:

mhhm

Answer:

do u want the answer now?

Answer:

uhhh D  .-.

Explanation:

Answer:C

Explanation:

Answer:

Oxygen has 8 protons in the nucleus while nitrogen only has 7. A bonding pair will experience more attraction from the oxygen's nucleus than from nitrogen's, and so the electronegativity of oxygen is greater.

Answer:

the movement of particles from a higher consentration to a lower consentration through a mechanical support.

Explanation:

By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.

Given the following data:

Initial volume = 3.0 L.

New pressure = 1.5 atm.

Initial pressure = 2.0 atm.

In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (2.0 × 3.0)/1.5

V₂ = 6.0/1.5

V₂ = 4.0 L.

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Answer:

D. 4.0 Liters

Explanation:

I took the exam

Answer:

0.0845 M

Explanation:

First we convert 4.27 grams of potassium iodide into moles, using its molar mass:

Now we calculate the molarity of the solution, using the number of moles and the given volume:

Formation of RnF₃⁺ will nat takes place easily or if it is form then it will decompose easily.

Lewis dot structure of any compound tells about the bonding and outermost electrons present in all the entities present in that compound.

Radon is a noble gas atom and have stable electronic configuration, but still they form radon flouride products due to the high electronegativity of flourine it attracts the lone pair of electrons of radon.

For the formation of compound promotion of 1, 2 or 3 electrons from the 6p orbital to the vaccant 6d orbitals will give rise to 2, 4 or half filled orbitals so they will form only products with odd number of atoms.

Hence RnF₃⁺ will not form any compound.

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Answer:

The number of ATP molecules made per NADH and FADH2 oxidation differ by 1.

The amount of ATP generated per mole of glucose when the glycerol-3-phosphate shuttle would be 30 instead of 32.

Explanation:

The glycerol-3-phosphate shuttle can transport cytosolic NADH equivalents into the mitochondrial matrix. In this shuttle, the protons and electrons are donated to FAD, which is reduced to FADH2. These protons and electrons are subsequently donated to coenzyme Q in the electron transport chain. Given that the number of ATP molecules made per NADH and FADH2 oxidation differ by 1, the amount of ATP generated per mole of glucose when the glycerol-3-phosphate shuttle would be 30 instead of 32.

FADH2 generates 1.5 ATP per molecule unlike NADH which generates 2.5 ATP per molecule. This is because electron transfer via FADH2 is not coupled to proton pumping unlike electron transfer reactions involving NADH. Thus, two moles of NADH from the oxidation of 2 moles of glyceraldehyde-2-phosophate to two moles of 1,3-bisphosphoglycerate will yield 3 moles of ATP rather than 5 moles when shuttled through the glycerol-3-phosphate shuttle. The glycerol-3-phosphate shuttle of cytosolic NADH shuttling occurs mainly in the brain and skeletal muscles and does not involve membrane transporters.

Answer:

D

Explanation:

Silicon, element number 14 is the fourth element in the third period in the periodic table. Its electronic configuration is 1s^2 2s^2 2p^6 3s^2 3p^2.

The elemental symbol of the previous noble gas preceding the atom is replaced by the arrangement of the remaining electrons to form a noble gas configuration of an atom.

So for Silicon, we substitute [Ne] 1s^2 2s^2 2p^6 and the noble gas configuration can now be [Ne] 3s^2 3p^2.

Answer: The molarity of this solution is 0.159 M.

Explanation:

Given: Mass of solute = 16.3 g

Volume = 1.75 L

Number of moles is defined as the mass of substance divided by its molar mass.

Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol[/tex]

Molarity is the number of moles of a substance present in a liter of solution.

So, molarity of the given solution is calculated as follows.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M[/tex]

Thus, we can conclude that the molarity of this solution is 0.159 M.

Answer:

Reactants collide to form a transition state.

Explanation:

So sorry if I’m wrong but I feel this is right

To solve such this we must know the concept of chemical reaction. The correct option is option B that is atoms in one compound switch places with atoms in another compound.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, combustion reaction, displacement reaction. "Reactants collide to form a transition state" describes the first part of a chemical reaction.

Therefore "Reactants collide to form a transition state" describes the first part of a chemical reaction. The correct option is option B.

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Answer:

[tex]n_b=0.947 Bohr\ magnetons/atom[/tex]

Explanation:

From the question we are told that:

Atomic radius [tex]r=0.126 nm[/tex]

Saturation flux density [tex]B= 0.69 T[/tex]

Generally the equation for number of Bohr magnetons per atom is mathematically given by

 [tex]n_b=\frac{B_s*Vc}{\mu_0*\mu_b}[/tex]

Where

 [tex]\mu_0=Magnetic\ permeability[/tex]

 [tex]\mu_0=1.257 * 10^{-6}[/tex]

 [tex]\mu_b=Magnetic\ Moment\ of\ an\ Atom[/tex]

 [tex]\mu_b=9.27* 10^{-24}[/tex]

 [tex]Vc=d^3[/tex]

 [tex]Vc=(2(0.126*10^-9))^3[/tex]

 [tex]Vc=1.6*10^{-29}[/tex]

Therefore the number of Bohr magnetons per atom for this material

 [tex]n_b=\frac{0.69*1.6*10^{-29}}{1.257 * 10^{-6}*9.27* 10^{-24}}[/tex]

 [tex]n_b=0.947 Bohr\ magnetons/atom[/tex]

Answer:

The entropy change for a real, irreversible process is equal to zero.

The correct option is 'c'.

Explanation:

Lets look around all the given options -:

(a)  the entropy change for a theoretical reversible process with the same initial and final states , since the entropy change is equal and opposite in reversible process , thus this option in not correct.

(b) equal to the entropy change for the same process performed reversibly ONLY if the process can be reversed at all. Since , the change is same as well as opposite too . Therefore , this statement is also not true .

(c) zero. This option is true because We generate more entropy in an irreversible process. Because no heat moves into or out of the surroundings during the procedure, the entropy change of the surroundings is zero.

(d) impossible to tell. This option is invalid , thus incorrect .

Hence , the correct option is 'c' that is zero.

Answer: the entropy change for a theoretical reversible process with the same initial and final states

Answer:

2K +F₂→ 2KF

Explanation:

When we balance an equation, we are trying to ensure that the number of atoms of each element is the same on both sides of the arrow.

On the left side of the arrow, there is 1 K atom and 2 F atoms. On the right, there is 1 K and 1 F atom.

Since the number of K atoms is currently balanced, balance the number of F atoms.

K +F₂→ 2KF

Now, that the number of F atoms is balanced on both sides, check if the number of K atoms are balanced.

Left

K atoms: 1

F atoms: 2

Right

K atoms: 2

F atoms: 2

The number of K atoms is not balanced.

2K +F₂→ 2KF

Left

K atoms: 2

F atoms: 2

Right

K atoms: 2

F atoms: 2

The equation is now balanced.

Answer:

3.4

373.4

.45.=2

46.=3 .6.2=4

Answer:

Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Explanation:

Answer:

Explanation:

A chemical symbol is a notation of one or two letters representing a chemical element. Its used to  identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Answer:

Hello the required Image related to your question is missing attached below is the missing Image

answer :

a) Ni²⁺(aq) + 2e⁻ ⇒ Ni(s)

b) Fe(s)  ⇒ Fe²⁺(aq) + 2e⁻

c)  Fe (s)

d) Ni ( s )

e)  Fe²⁺(aq)  and  SO⁻²₄ (aq)

f)  Ni²⁺(aq) and  SO⁻²₄(aq)

Explanation:

a) Balanced equation for the half-reaction at the cathode of the cell

Ni²⁺(aq) + 2e⁻ ⇒ Ni(s)

b) Balanced equation for half reaction at the anode of the cell

Fe(s)  ⇒ Fe²⁺(aq) + 2e⁻

c) E1 is made of  Fe (s)

d) E2 is made of Ni ( s )

e) chemical species in solution S1 = Fe²⁺(aq)  and  SO⁻²₄ (aq)

f) Chemical species in solution S2 = Ni²⁺(aq) and  SO⁻²₄(aq)

Answer:

a decrease in species A is correct answers

Answer:

traps heat and keeps the Earth warm.