I'm confused on how bonding works with metalloids. Will it be an ionic or covalent bond? For example P and As

Sketch the appearance of the 1 H-NMR spectrum of diethyl ether using J = 6.97 Hz and the data in Q2 in a spectrometer operating at (a) 350 MHz, (b) 650 MHz.

Consider the reaction shown. Suppose Meredith started with 0.51 g of sodium bromide, and 0.46 mL of 2,3-dimethylbutane for her reaction. Assuming the 2,3-dimethylbutane is the limiting reactant, how many grams, in theory, of 2,3-dibromo-2,3-dimethylbutane can be formed in the reaction?

Q2: When 500.0 mL of 2.00 M Ba(NO3)2 solution at 25.0 °C is mixed with 500.0 mL of 2.00 M Na2SO4 solution at 22.0°C in a coffee-cup calorimeter, the white solid BaSO4 forms, and the temperature increases to 28.2°C. Assume that the calorimeter is insulated and has negligible heat capacity, the specific heat capacity of the solution is 4.184 J/g°C, and the density of the final solution is 1.0 g/mL. Answer the questions below using the Balanced Equation: Ba(NO3)2 (aq)+ Na2SO4 > BaSO4 (s) + 2NaNO3 (aq). Answer to correct amount of Significant Figures

Determine the heat of the reaction in J

Determine the pH of an aqueous solution of Fe(CN)₆^3-, prepared using FeCl₃ and NaCN with formal concentrations of 0.001832 M and 0.5120 M.

logK_f(Fe(CN)₆^3-) = 43.6 K_a(HCN) = 6.2x10^-10

Balance these equations for reactions occurring in a basic solution. Don't include physical states for your answer.

CrO₂^- + S₂O₈^2- → CrO₄^2- + SO₄^2-

Au + CN^- + O₂ → Au(CN)₄^- + OH^-

Calculate the pH of the solution after the addition of the following amounts of 0.0536 M HNO3 to a 60.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04.

a) 0.00 mL of HNO3; Ph=

b)8.28mL of HNO3; Ph=

c) 42.0ml of HNO3

d) 84.0 mL of HNO3; Ph=

f) 88.5 mL of HNO3; Ph=

A mixture is prepared using 27.00 mL of a 0.0774 M weak base (pKa = 4.635), 27.00 mL of a 0.0581 M weak acid (pKa = 3.189) and 1.00 mL of 0.000116 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1123. The molar absorptivity (ε) values for HIn and its deprotonated form In– at 550 nm are 2.26 × 104 M–1cm–1 and 1.53 × 104 M–1cm–1, respectively. 1.) What is the pH of the solution? 2.)What are the concentrations of In– and HIn? respectively 3.)What is the pKa for HIn?

Instructions: For each part...Calculate the theoretical yield and percent yield. Then calculate the overall yield.

I am really struggling with this and have been working on it for awhile. Could you please show a step by step for my understanding?

Cyclohexanol: molecular weight 100.16g/mol

Cyclohexanol: density 0.947 g/cm 3

Part A: dehydration of cyclohexanol

Amount of cyclohexanol used (g): 7.4 g

Amount of cyclohexanol obtained (g): 1.611g

Cyclohexene: molecular weight 82.14 g/mol

Cyclohexene: density 0.81 g/cm 3

Part B: Oxidative Cleavage of Cyclohexene

Amount of cyclohexene used (g): 1.34 g

Mass of crude adipic acid (g): .394g

Mass of recrystallized adipic acid (g): 0.036g

Recrystallization percent recovery: 9.14%

Trichloroethene (TCE) is a common groundwater contaminant. In terms of cancer risk, which would be better:

(1) to drink un-chlorinated groundwater groundwater with 10 ppb TCE, or (2) drink surface that, as a result of chlorination, contains 50 ppb chloroform. Assume a 30-year consumption period. The potency factor for TCE is 1.1×10^-2 (mg/kg day)^-1 and the potency factor for chloroform is 6.1×10^-3 (mg/kg day)^-1.

(Risk for TCE = 1.35×10-6)

I know the risk equation is: (Potency Factor)( CDI) but I wasn't sure what volume to use for the calculation since it isnt given

In the distillation apparatus, it is important that the bulb of the thermometer is placed below the sidearm of the still head. Briefly explain why the thermometer placement is so important.

Phosphorus pentachloride decomposes at higher temperatures.

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

An equilibrium mixture at some temperature consists of

3.03 g PCl₅, 208.23 g/mol
4.86 g PCl₃, 137.33 g/mol
3.59 g Cl₂, 70.91 g/mol

in a 1.00-L flask.

If you add 1.31 g of Cl₂, how will the equilibrium be affected and what will the concentration of PCl₅ be when equilibrium is reestablished?

shift left

shift right

no shift will occur

[PCl₅] =   mol/L

When the following skeletal equation is balanced under basic conditions, what are the coefficients of the species shown? SiO32- + Br- --> Br2 + Si Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of . (Enter 0 for neither.) Which species is the reducing agent?

When the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown? Ag+ + Mg-->Ag + Mg2+ Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of . (Enter 0 for neither.) How many electrons are transferred in this reaction?