In a Wittig reaction, what is the difference between a betaine intermediate and a ylide?

draw the mechanism for 1,3 butadiene = HBR for both possible products. explain which is the major product under thermodynamic control.

17. Consider the following balanced chemical equation:

A. 2Al(s) + 3Cl₂(g) → 2AlCl₃(s)   Determine the mass (in g) of AlCl₃ formed if 27.6 g of Al reacts with 47.6 g of Cl₂

B. What volume, in L, of 0.0771 M LiOH solution is required to produce 72.9 g of water.

2LiOH(aq) + H₂SO₄(aq) → 2H₂O(l) + Li₂SO₄(aq)

_C. What volume (in mL, at 558 K and 3.49 atm) of oxygen gas is required to react with 4.84 g of Al?

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

Molecular Structure and Physical Properties

Consider the following statements and determine which are true and which are false.

true/false  SeF₄ has a see-saw structure.
true/false  KrF₄ is a polar molecule.
true/false  NO₃^- has three resonance Lewis structures.
true/false  Bond angles for IF₆⁺ are 90 °.
true/false  Selenium tetrafluoride (SeF₄) is a non-polar molecule.
true/false  The formal oxidation state of an atom in a molecule (or molecular ion) can be calculated as:
(the number of valence electrons on a free atom) minus (half the number of electrons in bonds to that atom) minus (the number of unshared electrons assigned to the atom in the molecule)

A****41.9 mL of a 0.146 M Na2CO3 solution completely react with a 0.150 MHNO3 solution according to the following balanced chemical equation:  

Na2CO3(aq)+2HNO3(aq)→2NaNO3(aq)+CO2(g)+H2O(l)

What mass (in grams) of carbon dioxide is formed?

B*****

What volume (in mL) of a 0.100 MHNO3 solution is required to completely react with 31.8 mL of a 0.108 MNa2CO3 solution according to the following balanced chemical equation?

Na2CO3(aq)+2HNO3(aq)→2NaNO3(aq)+CO2(g)+H2O(l)

C****

What volume of a 5.70 M solution of NaNO3 do you need to make 0.510 L of a 1.00 M solution of NaNO3?

if you could write out the steps that would be so helpful! thank you

A manufacturer of bicycles has 4833 wheels, 2315 frames, and 2255 handlebars.

1. How many bicycles can be manufactured using these parts?

2. How many wheels are left over?

3. How many frames are left over?

4.How many handlebars are left over?

The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much energy would it take to raise the temperature of 9.10 g of silver by 10.5 ∘C? Use the following values:specific heat of water = 4.18 J/(g⋅∘C) specific heat of steel = 0.452 J/(g⋅∘C)

Find ΔHrxn for the reaction: N2O(g)+NO2(g)→3NO(g) Use these reactions with known ΔH's: 2NO(g)+O2→2NO2(g)ΔH=−113.1kJ N2(g)+O2→2NO(g)ΔH=+182.6kJ 2N2O(g)→2N2(g)+O2(g)ΔH=−163.2kJ

1) how does the presence of lone pairs affect the angle between the atoms bonded to central atom?

2) draw the more stable valence electron orbital diagram for carbon.

3) if a carbon bond is sp3 hybridizedit must have ___ sigma bonds and ___ pi bond. The shape of the molecule at the pi bond must be _______.

This question was about quantum nubers. It isn't multiple questions. just multiple parts of the same question with very short answers according to my teacher. I am confused about how to solve them please help. Thanks.

Question 2

(A) List the allowed quantum numbers m_l for the 2p subshell.

(B) List the allowed quantum numbers m_s for each of the m_l values for the 2p subshell.

(C) List the allowed quantum numers m_l for the 3d subshell.

(D) List the allowed quantum numbers m_sfor each of the m_l values for the 3d subshell.

(E) List the allowed quantum numbers m_l for the 4f subshell.

(F) List the allowed quantum numbers m_s for each of the m_l values for the 4f subshell.

(G) List the allowed quantum numbers m_l for the 5g subshell.

(H) List the allowed quantum numbers m_s for each of the m_l values for the 5g subshell.

For each of the following pairs of substances, determine which has the larger molar entropy at 298 K:

(A) Cl2(g) or (B) Br2(l)

(C) Ni(s) or (D) Fe(s)

(E) C2H6(g) or (F) C2H4(g)

(G) CH4(g) or (H) CCl4(g)

(I) MgO(s) or (J) HgO(s)

(K) MgCl2(aq) or (L) NaCl(aq

1) Pretend you have just synthesized a novel, relatively non-polar compound that is solid at room temperature. The last reaction you performed on route to this compound also formed small quantities of more polar impurities. You are going to attempt to purify your novel compound by recrystallization. Would you rather try using ethanol or cyclohexane? Explain why.

2) When is it necessary to use a solvent-pair recrystallization?

Calculate the heat absorbed when 578 g of ice at −12.7°C melts and then the water is converted to steam at 205.0°C. The specific heat of ice is 2.03 J/(g°C),the heat of fusion of ice is 6.01 ×103 J/mol, the specific heat of water is 4.18 J/(g°C),the heat of vaporization of water is 4.07 × 104J/mol, and the specific heat of steam is 2.02 J/(g°C).