That y8 kid 🤣 - bot · guest · Chemistry

01 During a one-minute revision round: Carbon dioxide has polar bonds but is non-polar because

A it forms ionic bonds This does not satisfy the stated relationship.

B its linear bond dipoles cancel The molecule is linear and symmetric.

C C and O have equal electronegativity This does not satisfy the stated relationship.

D it contains no valence electrons This does not satisfy the stated relationship.

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

02 Which response best completes this VCE-style item? Polyethene is formed from ethene by

A acid-base neutralisation This does not satisfy the stated relationship.

B addition polymerisation The C=C bonds open and monomers add without a small-molecule by-product.

C hydrolysis This does not satisfy the stated relationship.

D condensation polymerisation with water released This does not satisfy the stated relationship.

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

03 Which response best completes this VCE-style item? 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

04 During a one-minute revision round: The strongest intermolecular attraction between water molecules is

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

B metallic bonding This does not satisfy the stated relationship.

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

D ionic bonding This does not satisfy the stated relationship.

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

05 Structural isomers have

A different molecular formulas only This does not satisfy the stated relationship.

B identical structural formulas This does not satisfy the stated relationship.

C the same molecular formula but different connectivity Structural isomers differ in how atoms are connected.

D the same physical properties in every case This does not satisfy the stated relationship.

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

06 Which response best completes this VCE-style item? One mole of molecules contains approximately

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

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

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

D 1 molecule This does not satisfy the stated relationship.

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

07 During a one-minute revision round: How many moles are in 18.0 g of water?

A 324 mol This does not satisfy the stated relationship.

B 0.500 mol This does not satisfy the stated relationship.

C 18.0 mol This does not satisfy the stated relationship.

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

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

08 During a one-minute revision round: One mole of molecules contains approximately

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

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

C 1 molecule This does not satisfy the stated relationship.

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

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

09 During a one-minute revision round: A highly cross-linked polymer is usually

A an ionic solution This does not satisfy the stated relationship.

B thermosetting Cross-links prevent chains sliding when heated.

C easily remelted as a thermoplastic This does not satisfy the stated relationship.

D a monatomic gas This does not satisfy the stated relationship.

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

10 During a one-minute revision round: The pH of \(1.0\times10^{-3}\ \mathrm{M\ HCl}\) is

A 11.0 This does not satisfy the stated relationship.

B 1.0 This does not satisfy the stated relationship.

C 7.0 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

11 Which response best completes this VCE-style item? Mixing \(\mathrm{AgNO_3(aq)}\) and \(\mathrm{NaCl(aq)}\) forms

A \(\mathrm{Ag(s)}\) This does not satisfy the stated relationship.

B \(\mathrm{AgCl(s)}\) Silver chloride is insoluble; sodium nitrate remains aqueous.

C \(\mathrm{NaNO_3(s)}\) This does not satisfy the stated relationship.

D \(\mathrm{Cl_2(g)}\) This does not satisfy the stated relationship.

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

12 A strong acid differs from a weak acid because the strong acid

A has a larger molar mass This does not satisfy the stated relationship.

B ionises to a greater extent in water Strength describes extent of ionisation, not concentration.

C must be more concentrated This does not satisfy the stated relationship.

D contains more hydrogen atoms This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Acids and bases · answered at 100 ms

13 A highly cross-linked polymer is usually

A easily remelted as a thermoplastic This does not satisfy the stated relationship.

B a monatomic gas This does not satisfy the stated relationship.

C an ionic solution This does not satisfy the stated relationship.

D thermosetting Cross-links prevent chains sliding when heated.

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

14 A student is checking a worked solution. The molecular shape of ammonia, \(\mathrm{NH_3}\), is

A bent This does not satisfy the stated relationship.

B tetrahedral This does not satisfy the stated relationship.

C pyramidal Three bonding pairs and one lone pair give a pyramidal shape.

D linear This does not satisfy the stated relationship.

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

15 A student is checking a worked solution. A strong acid differs from a weak acid because the strong acid

A ionises to a greater extent in water Strength describes extent of ionisation, not concentration.

B contains more hydrogen atoms This does not satisfy the stated relationship.

C must be more concentrated This does not satisfy the stated relationship.

D has a larger molar mass This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Acids and bases · answered at 100 ms

16 Which response best completes this VCE-style item? Which equation conserves atoms and charge?

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

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

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

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

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

17 A student is checking a worked solution. An unknown absorbance lies beyond all standards on a calibration graph. The best action is to

A extrapolate indefinitely This does not satisfy the stated relationship.

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

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

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

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

18 Which response best completes this VCE-style item? Across Period 3 from left to right, atomic radius generally

A increases This does not satisfy the stated relationship.

B first decreases then always doubles This does not satisfy the stated relationship.

C stays constant This does not satisfy the stated relationship.

D decreases Increasing effective nuclear charge draws electrons closer.

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

19 A student is checking a worked solution. The strongest intermolecular attraction between water molecules is

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

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

C ionic bonding This does not satisfy the stated relationship.

D metallic bonding This does not satisfy the stated relationship.

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

20 Which equation conserves atoms and charge?

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

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

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

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

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