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6) A 7 mL sample of a solution of K2CO3 was diluted with water to 25 mL. A 10 mL sample of the dilute solution was found to contain 0.61 M CO32-. What was the concentration of K2CO3 in the original undiluted solution?

(5)Which of the following equations represents the proper net ionic equation for the complete neutralization reaction between the strong base Ba(OH)2 (aq) and the strong acid HI (aq)?

1- HI (aq) + OH- (aq) ----> H2O (l) + I- (aq)
2- 2 HI (aq) + Ba(OH)2 (aq) ----> 2 H2O (l) + BaI2 (aq)
3- 2 I- (aq) + Ba2+ (aq) ----> BaI2 (aq)
4- 2 H+ (aq) + 2(OH)- (aq) ----> 2 H2O (l)
5- 2 H+ (aq) + Ba(OH)2 (aq) ----> 2 H2O (l) + Ba2+ (aq)
6- 2 H+ (aq) + Ba2+ (aq) ----> H2Ba (aq)
7- I- (aq) + OH- (aq) ----> IOH (aq)
8- H+ (aq) + OH- (aq) ----> H2O (l)

A 40.5−g sample of dinitrogen monoxide is confined in a 4.35−L vessel. What is the pressure (in atm) at 101°C?

Write (1) a balanced molecular equation, (2) a total ionic equation, and (3) a net ionic equation that would describe a predicted reaction. Please pay attention to details such as charges (e.g. Ba2+ vs. Ba) and states (i.e. (aq), (s), (l), or (g) as appropriate). If a reaction is not predicted to occur (soluble salts on both sides of the equation), only the balanced molecular equation is needed.

sodium carbonate + sulfuric acid

Na2CO3 (aq)+ H2SO4(aq) -> Na2SO4(aq) + CO2 (g)+ H2O(l)

Na+(aq)+CO3^2−(aq)+2H+(aq)+SO4^2−(aq) ->H2O(l)+CO2(g)+2Na+(aq)+SO4^2−(aq)

CO3^2−(aq)+2H+(aq) -> H2O(l)+CO2(g)

sodiumcarbonate + hydrochloric acid

Na2CO3(aq) + HCl (aq)-> NaCl (aq)+ H2O (l)+ CO2(g)

Na+(aq) + CO3^-2 (aq)

potassium chloride + sodium carbonate

KCl (aq)+ Na2CO3 (aq)-> K2CO3 (aq)+ 2NaCl(aq)

potassium chloride + silver nitrate

KCl (aq)+ AgNO3 (aq) -> KNO3 (aq)+ AgCl (s)

potassium chloride + sodium nitrate

KCl (aq)+ NaNO3 (aq) ->  KNO3 (aq)+ NaCl(aq)

nickel chloride + silver nitrate

NiCl2 (aq)+ 2AgNO3(aq) ->  Ni (NO3)2(aq) + 2AgCl (s)

nickel chloride + sodium carbonate

KCl (aq)+ Na2CO3(aq) -> K2CO3 (aq)+ 2NaCl(aq)

hydrochloric acid + sodium hydroxide

HCl (aq)+ NaOH(aq) ->  NaCl(aq) + H2O(l)

Ammonium chloride + sodium hydroxide

NH4Cl(aq) + NaOH(aq) ->  NaCl(aq) + H2O (l)+ NH3(g)

sodium acetate + hydrochloric acid

CH3COONa (aq)+HCl (aq) ->  CH3COOH(aq) +NaCl(aq)

lead nitrate + sulfuric acid

Pb(NO3)2 (aq)+ H2SO4(aq) -> PbSO4 (aq)+ HNO3(aq)

Calculate the pH of a buffer made by dissolving 0.20 mole sodium cyanate and 1.0 mole cyanic acid in water to make 1.0 L of solution. Ka of cyanic acid = 2.0 x 10-4

Do adipocytes store large amounts of starch?

Is it true that the effect of a catalyst on a chemical reaction is to react with product, effectively removing it and shifting the equilibrium to the right?

The anode 



that releases electrons and attracts cations in the salt bridge


that receives electrons and attracts anions in the salt bridge


that receives the electrons and attracts the cations in the salt bridge


that releases the electrons and attract the anions in the salt bridge

Which of these is a general feature of the lipid bilayer in all biological membranes?

a) individual lipid molecules are free to diffuse laterally in the surface of the bilayer

b) individual lipid molecules in one monolayer of the bilayer readily diffuse (flip-flop) to the other monolayer.

c) polar, but uncharged, compounds readily diffuse across the bilayer

d) the bilayer is stabilized by covalent bonds between neighboring phospholipid molecules.

e) the polar head groups face inward toward the inside of the bilayer

which pathway does not involve both the cytoplasm and the mitochondria? (both cell locations do not have to occur for the same % of the pathway).

fermentation

aerobic respiration

fatty acid synthesis

beta oxidation

As a chemical reaction proceeds over time spontaneously at a constant temperature, which statement is true:

A) ΔG0 approaches zero and ΔG remains unchanged

B) ΔG0 remains unchanged and ΔG approaches zero

C) ΔG0 approaches zero and ΔG approaches zero

D) ΔG0 remains unchanged and ΔG remains unchanged

E) ΔG0 decreases and ΔG remains unchanged

Please explain each answer choice in detail

Water is known as a polar molecule because ( check all apply)

the oxygen and hydrogen atoms have the same electronegativity.
the hydrogen atom attracts electrons much more strongly than the oxygen atom.
water has two hydrogen atoms covalently bonded to a single oxygen atom.
the oxygen atom has a greater attraction for electrons than the hydrogen atom does.
the water dipole moment is equal to zero.
the electrons of the covalent bond are not shared equally between the hydrogen and oxygen atoms.

HCl, HBr, and HI are strong acids, yet HF is a weak acid. What does that mean in terms of the extent to which these substances are ionized in solution?

A reaction occurs at a pH of approximately 5. Which of the following buffer systems would be best used to make a solution with this pH?

Select one:

a. [CH3COOH] :[CH3COO-]

b. [H2PO4-]: [HPO42-]

c. [H2CO3] :[HCO3-]

d. none of these.

Which law states that when equilibrium is disturbed, the reaction will change to counteract the disturbance?

Chlorine has an electronegativity value of 3.0. Given the electronegativity of N, O, and P (3.0, 3.5, and 2.1, respectively), which of the following has nonpolar bonds?

A. NCl₃

B. Cl₂O

C. PCl₃

D. All

E. None

The first four ionization energies of an element X are 0.58, 1.82,2.74, and 11.58 MJ/mol. What is the most likely formula for astable ion of X?
Choose one answer.
a. X-
b. X+
c. X2+
d. X3+

Is it true that an HCl/NaCl mixture will act as a more effective buffer than a mixture of CH3COOH & CH3COONa?

which of the following chemical species is a cation Cl- , H+orAu

why is the dissociation energy at the ground state higher than the excited state?

Gaseous ethane  will react with gaseous oxygen  to produce gaseous carbon dioxide  and gaseous water . Suppose 10. g of ethane is mixed with 22.5 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

N2(g) + O2(g) ↔ 2NO(g) are KP = 1.1 x 10–3 and 3.6 x 10–3 at 2,200 K and 2,500 K, respectively. Which one of these statements is true? Select one:

a. KP is less than Kc by a factor of (RT).

What range of buffers could you prepare from a weak acid with pKa of 5.5?

Write the balanced formula unit equation for the reaction of the complete combustion of pentane, C5H12. What is the sum of the coefficients?
A) 16
B) 19
C) 20
D) 21
E) 22

What substance has the greater boiling point, based on therelative strengths of the intermolecular forces. (Explain youranswer. CH₃I or CHI₃)

Fe2O3(molar mass=159.7 g/mol) reacts with CO(molar mass=28.0g/mol) according to the equationFe2O3(s)+3CO(g)>>>> 3CO2(g)+2Fe(s)
When 116g of CO reacts with excess Fe2O3, how many moles of iron will be produced?

What is the maximum mass (in g) of ammonia that can be produced from a mixture of 6.65 ✕ 102 g N2 and 1.07 ✕ 102 g H2?

Page 4 12.A compound with an empirical formula of C2H2Br3has a molar mass of 531.47 g/mol. What is the molecular formula?

A)C2H2Br3

B)C4H4Br6

C)CHBr

D)C4H4Br3

E)C6H6Br913.

Which of the following compounds is a weak acid?

A)HNO2

B)HCl

C)HBr

D)HNO3

E)HClO4

A 100 mL portion of a weak acid, HA, is titrated with 0.100 M sodium hydroxide solution. Which of the following statements is/are CORRECT concerning this titration? 1. The solution is neutral at the equivalence point. 2. The solution is basic at the equivalence point. 3. The solution is buffered BEFORE the equivalence point is reached. 4. The solution is buffered AFTER the equivalence point is reached. A. 2 & 3 only B. 1 & 4 only C. 2 & 4 only D. 2,3 & 4 only E. 1 & 3 only

What ions are present in a solution of AgNO_3. ?Theoretically, which of these ions will affect the equilibriumbelow and what will its effect be? Explain why you expect this tohappen.

Co(H₂O)²₆ (aq) +4Cl^- (aq) <===> CoCl^2-₄ (aq)+ 6H₂O (l)

What ions are present in a solution of HCl? Theoretically, whichof these ions will affect the equilibrium of Co Cl_{2, and whatwill its effect be?}

which of the following has the lowest boiling point? acetone, formaldehyde, 3-octanone and cyclopentanone

What is the trend of reactivity of metal ions?

When an atom of an electropositive atom becomes an ion, it
a) gains electrons
b) becomes larger
c) emits an alpha particle
d) does none of these

What is the answer and why? If the answer is D, then please explainwhat it would do. Thanks!

Given the following rate law, how does the rate of reactionchange if the concentration of Y is doubled?

Rate= k[X]²[Y]³

rate of rxn will increase by a factor of:

9, 2, 8, or 4?

upon decomposing, one sample of magnesium fluoride produces 1.65 kg magnesium and 2.57 kg of fluorine.
A second sample produces 1.32 kg of magnesium. How much fluorine (in g) does the second sample produce?