That y8 kid 🤣 - bot · guest · Chemistry

01 Which response best completes this VCE-style item? How many moles are in 18.0 g of water?

A 0.500 mol This does not satisfy the stated relationship.

B 18.0 mol This does not satisfy the stated relationship.

C 1.00 mol \(n=m/M=18.0/18.0=1.00\).

D 324 mol This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Mole concept · answered at 100 ms

02 Which response best completes this VCE-style item? Atom economy measures the proportion of reactant atoms incorporated into the

A catalyst This does not satisfy the stated relationship.

B waste only This does not satisfy the stated relationship.

C solvent This does not satisfy the stated relationship.

D desired product High atom economy places more reactant mass in the desired product.

Written for icaijy.com · U4 · Green chemistry · answered at 100 ms

03 Which functional group identifies a carboxylic acid?

A \(\mathrm{C=C}\) This does not satisfy the stated relationship.

B \(\mathrm{-Cl}\) This does not satisfy the stated relationship.

C \(\mathrm{-COOH}\) Carboxylic acids contain the carboxyl group.

D \(\mathrm{-OH}\) only This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Organic families · answered at 100 ms

04 A student is checking a worked solution. A proton signal split into a triplet usually has how many equivalent neighbouring protons?

A 2 The n+1 rule gives n = 2.

B 1 This does not satisfy the stated relationship.

C 0 This does not satisfy the stated relationship.

D 3 This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Proton NMR · answered at 100 ms

05 During a one-minute revision round: Which equation conserves atoms and charge?

A \(\mathrm{Ag^++2Cl^-\rightarrow AgCl}\) This does not satisfy the stated relationship.

B \(\mathrm{Ag^+(aq)+Cl^-(aq)\rightarrow AgCl(s)}\) The net ionic equation is balanced for atoms and charge.

C \(\mathrm{Ag+Cl^-\rightarrow AgCl^-}\) This does not satisfy the stated relationship.

D \(\mathrm{Ag^++Cl^-\rightarrow Ag+Cl}\) This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Equations · answered at 100 ms

06 A student is checking a worked solution. The most suitable apparatus for delivering one accurately known titration volume is a

A beaker This does not satisfy the stated relationship.

B test tube This does not satisfy the stated relationship.

C burette A burette measures accurately the variable volume delivered.

D measuring cylinder This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Volumetric analysis · answered at 100 ms

07 Which response best completes this VCE-style item? At SLC, the molar volume used in the VCAA data book is

A \(22.4\ \mathrm{L\ mol^{-1}}\) This does not satisfy the stated relationship.

B \(100\ \mathrm{L\ mol^{-1}}\) This does not satisfy the stated relationship.

C \(24.8\ \mathrm{L\ mol^{-1}}\) At 25 °C and 100 kPa, the data-book value is 24.8 L mol⁻¹.

D \(8.31\ \mathrm{L\ mol^{-1}}\) This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Gases · answered at 100 ms

08 Oxidation of a primary alcohol can ultimately produce a

A triglyceride directly This does not satisfy the stated relationship.

B haloalkane only This does not satisfy the stated relationship.

C tertiary amine This does not satisfy the stated relationship.

D carboxylic acid A primary alcohol can oxidise via an aldehyde to a carboxylic acid.

Written for icaijy.com · U4 · Organic pathways · answered at 100 ms

09 A student is checking a worked solution. One mole of molecules contains approximately

A 1 molecule This does not satisfy the stated relationship.

B \(6.02\times10^{23}\) molecules One mole contains Avogadro’s number of entities.

C \(22.4\times10^3\) molecules This does not satisfy the stated relationship.

D \(6.02\times10^{-23}\) molecules This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Avogadro constant · answered at 100 ms

10 Increasing temperature usually increases rate because particles

A become heavier This does not satisfy the stated relationship.

B collide more often and a larger fraction exceed activation energy Both collision frequency and the successful fraction increase.

C lower the activation energy themselves This does not satisfy the stated relationship.

D stop colliding elastically This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Collision theory · answered at 100 ms

11 During a one-minute revision round: An atom has 17 protons and 18 electrons. It is

A \(\mathrm{Cl^+}\) This does not satisfy the stated relationship.

B \(\mathrm{Cl^-}\) One extra electron gives chlorine a −1 charge.

C \(\mathrm{Ar}\) This does not satisfy the stated relationship.

D \(\mathrm{Cl}\) This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Atomic structure · answered at 100 ms

12 A student is checking a worked solution. The number of signals in a low-resolution \(^{13}\mathrm C\)-NMR spectrum indicates the number of

A carbon atoms without regard to symmetry This does not satisfy the stated relationship.

B hydrogen atoms This does not satisfy the stated relationship.

C double bonds only This does not satisfy the stated relationship.

D distinct carbon environments Chemically equivalent carbon atoms share a signal.

Written for icaijy.com · U4 · Carbon NMR · answered at 100 ms

13 The pH of \(1.0\times10^{-3}\ \mathrm{M\ HCl}\) is

A 1.0 This does not satisfy the stated relationship.

B 7.0 This does not satisfy the stated relationship.

C 11.0 This does not satisfy the stated relationship.

D 3.0 For strong HCl, \([H^+]=10^{-3}\), so pH = 3.

Written for icaijy.com · U2 · pH · answered at 100 ms

14 During a one-minute revision round: An unknown absorbance lies beyond all standards on a calibration graph. The best action is to

A report zero concentration This does not satisfy the stated relationship.

B extrapolate indefinitely This does not satisfy the stated relationship.

C dilute it into the calibrated range and account for dilution Reliable interpolation requires the unknown to lie within the calibrated range.

D change the wavelength after measuring This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Calibration curves · answered at 100 ms

15 During a one-minute revision round: In a chromatogram, a pure substance under fixed conditions should ideally produce

A four spots This does not satisfy the stated relationship.

B no solvent front This does not satisfy the stated relationship.

C one spot A single component ideally produces one spot.

D a spot beyond the solvent front This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Chromatography · answered at 100 ms

16 Which response best completes this VCE-style item? The strongest intermolecular attraction between water molecules is

A metallic bonding This does not satisfy the stated relationship.

B ionic bonding This does not satisfy the stated relationship.

C hydrogen bonding O–H bonds allow hydrogen bonding between molecules.

D covalent network bonding This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Intermolecular forces · answered at 100 ms

17 Atom economy measures the proportion of reactant atoms incorporated into the

A solvent This does not satisfy the stated relationship.

B waste only This does not satisfy the stated relationship.

C desired product High atom economy places more reactant mass in the desired product.

D catalyst This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Green chemistry · answered at 100 ms

18 Which response best completes this VCE-style item? A tetrahedral carbon is chiral when bonded to

A two double bonds This does not satisfy the stated relationship.

B one hydrogen only This does not satisfy the stated relationship.

C four different groups Four different substituents create a chiral centre.

D four identical groups This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Chirality · answered at 100 ms

19 The number of signals in a low-resolution \(^{13}\mathrm C\)-NMR spectrum indicates the number of

A distinct carbon environments Chemically equivalent carbon atoms share a signal.

B hydrogen atoms This does not satisfy the stated relationship.

C double bonds only This does not satisfy the stated relationship.

D carbon atoms without regard to symmetry This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Carbon NMR · answered at 100 ms

20 A student is checking a worked solution. Repeating measurements primarily helps assess

A molar mass This does not satisfy the stated relationship.

B random uncertainty and repeatability Repeated trials reveal spread and improve the estimate of random variation.

C the accepted value automatically This does not satisfy the stated relationship.

D whether the hypothesis is true by definition This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Experimental design · answered at 100 ms