That y8 kid 🤣 - bot · guest · Chemistry

01 A student is checking a worked solution. Graphite conducts electricity mainly because it has

A free protons This does not satisfy the stated relationship.

B weak covalent bonds in each layer This does not satisfy the stated relationship.

C mobile carbon ions This does not satisfy the stated relationship.

D delocalised electrons within layers One electron per carbon is delocalised through each layer.

Written for icaijy.com · U1 · Structure and properties · answered at 100 ms

02 Which response best completes this VCE-style item? Ice is less dense than liquid water because its hydrogen-bonded structure is

A free of intermolecular forces This does not satisfy the stated relationship.

B more open The solid lattice holds molecules further apart.

C ionic This does not satisfy the stated relationship.

D more tightly packed This does not satisfy the stated relationship.

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

03 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

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

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

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

C hydrolysis This does not satisfy the stated relationship.

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

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

05 Which response best completes this VCE-style item? For standard half-cell potentials, \(E^\circ_{cell}\) is calculated as

A \(E^\circ_{reduction}-E^\circ_{oxidation}\) Subtract the listed reduction potential of the oxidation half-cell.

B \(Q/t\) This does not satisfy the stated relationship.

C \(E^\circ_{reduction}+E^\circ_{oxidation}\) using listed signs This does not satisfy the stated relationship.

D \(IR\) This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Cell potentials · answered at 100 ms

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

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

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

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

07 During a one-minute revision round: A major sustainability advantage of a biofuel can be

A no land use This does not satisfy the stated relationship.

B infinite atom economy This does not satisfy the stated relationship.

C renewable feedstock Biomass can be replenished, though impacts still require evaluation.

D guaranteed zero emissions This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Biofuels · answered at 100 ms

08 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

09 Which response best completes this VCE-style item? During recharge, a secondary cell operates as

A a calorimeter This does not satisfy the stated relationship.

B a spontaneous galvanic cell This does not satisfy the stated relationship.

C an electrolytic cell External electrical energy drives the reverse reaction.

D a fuel cell This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Secondary cells · answered at 100 ms

10 Which response best completes this VCE-style item? The salt bridge mainly

A raises activation energy This does not satisfy the stated relationship.

B prevents all ion movement This does not satisfy the stated relationship.

C supplies electrons to the wire This does not satisfy the stated relationship.

D maintains electrical neutrality by ion migration Ion migration completes the circuit and prevents charge build-up.

Written for icaijy.com · U3 · Galvanic cells · answered at 100 ms

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

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

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

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

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

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

12 A student is checking a worked solution. Solid sodium chloride does not conduct electricity because

A it contains no charged particles This does not satisfy the stated relationship.

B sodium is a non-metal This does not satisfy the stated relationship.

C chloride ions lose their charge This does not satisfy the stated relationship.

D its ions cannot move through the lattice The charged ions are fixed in the solid lattice.

Written for icaijy.com · U1 · Ionic substances · answered at 100 ms

13 Which response best completes this VCE-style item? Graphite conducts electricity mainly because it has

A free protons This does not satisfy the stated relationship.

B weak covalent bonds in each layer This does not satisfy the stated relationship.

C delocalised electrons within layers One electron per carbon is delocalised through each layer.

D mobile carbon ions This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Structure and properties · answered at 100 ms

14 The anode of a discharging galvanic cell is

A uncharged by definition This does not satisfy the stated relationship.

B alternating This does not satisfy the stated relationship.

C negative Electrons leave the negative anode.

D positive This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Galvanic cells · 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 must be more concentrated This does not satisfy the stated relationship.

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

C contains more hydrogen atoms 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 Reprocessing used aluminium into new aluminium products is closest to

A complete biodegradation This does not satisfy the stated relationship.

B a linear economy This does not satisfy the stated relationship.

C carbon capture This does not satisfy the stated relationship.

D a circular economy Material is recovered and returned to productive use.

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

17 During a one-minute revision round: A component travels 3.0 cm while the solvent front travels 5.0 cm. Its \(R_f\) is

A 2.0 This does not satisfy the stated relationship.

B 8.0 This does not satisfy the stated relationship.

C 1.67 This does not satisfy the stated relationship.

D 0.60 \(R_f=3.0/5.0=0.60\).

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

18 Which response best completes this VCE-style item? A major sustainability advantage of a biofuel can be

A guaranteed zero emissions This does not satisfy the stated relationship.

B infinite atom economy This does not satisfy the stated relationship.

C no land use This does not satisfy the stated relationship.

D renewable feedstock Biomass can be replenished, though impacts still require evaluation.

Written for icaijy.com · U3 · Biofuels · answered at 100 ms

19 Down a group, first ionisation energy generally

A decreases Outer electrons are further from the nucleus and more shielded.

B increases This does not satisfy the stated relationship.

C becomes zero This does not satisfy the stated relationship.

D is exactly constant This does not satisfy the stated relationship.

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

20 During a one-minute revision round: Ice is less dense than liquid water because its hydrogen-bonded structure is

A free of intermolecular forces This does not satisfy the stated relationship.

B more tightly packed This does not satisfy the stated relationship.

C more open The solid lattice holds molecules further apart.

D ionic This does not satisfy the stated relationship.

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