That y8 kid 🤣 - bot · guest · Chemistry

01 Which response best completes this VCE-style item? The IUPAC name of \(\mathrm{CH_3CH_2OH}\) is

A methanol This does not satisfy the stated relationship.

B ethene This does not satisfy the stated relationship.

C ethanol It is a two-carbon alcohol.

D ethanal This does not satisfy the stated relationship.

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

02 During recharge, a secondary cell operates as

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

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

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

D a calorimeter This does not satisfy the stated relationship.

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

03 Fractional distillation is preferred over simple distillation when liquids have

A similar boiling points Repeated vaporisation-condensation improves separation of close boiling points.

B very different colours This does not satisfy the stated relationship.

C identical densities only This does not satisfy the stated relationship.

D no intermolecular forces This does not satisfy the stated relationship.

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

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

A ionic bonding This does not satisfy the stated relationship.

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

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

D metallic bonding This does not satisfy the stated relationship.

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

05 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

06 A student is checking a worked solution. An alkene reacting with bromine undergoes

A addition The C=C bond opens and bromine atoms add.

B condensation polymer hydrolysis This does not satisfy the stated relationship.

C substitution This does not satisfy the stated relationship.

D esterification This does not satisfy the stated relationship.

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

07 During a one-minute revision round: Polyethene is formed from ethene by

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

B hydrolysis This does not satisfy the stated relationship.

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

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

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

08 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

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

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

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

10 Which response best completes this VCE-style item? 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

11 Which response best completes this VCE-style item? A competitive inhibitor reduces activity by

A binding at the active site It competes with substrate for the active site.

B becoming the product This does not satisfy the stated relationship.

C breaking every peptide bond This does not satisfy the stated relationship.

D raising substrate concentration to infinity This does not satisfy the stated relationship.

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

12 A student is checking a worked solution. Atom economy measures the proportion of reactant atoms incorporated into the

A waste only This does not satisfy the stated relationship.

B solvent This does not satisfy the stated relationship.

C catalyst 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

13 A student is checking a worked solution. A current of 2.0 A flows for 30 s. The charge transferred is

A 600 C This does not satisfy the stated relationship.

B 32 C This does not satisfy the stated relationship.

C 15 C This does not satisfy the stated relationship.

D 60 C \(Q=It=2.0\times30=60\ \mathrm C\).

Written for icaijy.com · U3 · Faraday laws · answered at 100 ms

14 During a one-minute revision round: Repeating measurements primarily helps assess

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

B molar mass This does not satisfy the stated relationship.

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

15 A competitive inhibitor reduces activity by

A breaking every peptide bond This does not satisfy the stated relationship.

B binding at the active site It competes with substrate for the active site.

C becoming the product This does not satisfy the stated relationship.

D raising substrate concentration to infinity This does not satisfy the stated relationship.

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

16 During a one-minute revision round: 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

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

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

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

C a monatomic gas 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

18 Which response best completes this VCE-style item? If \(Q<K_c\), the net reaction proceeds

A towards products More products form until Q reaches Kc.

B only after adding catalyst This does not satisfy the stated relationship.

C at equal forward and reverse rates immediately This does not satisfy the stated relationship.

D towards reactants This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Reaction quotient · answered at 100 ms

19 The molecular shape of ammonia, \(\mathrm{NH_3}\), is

A bent This does not satisfy the stated relationship.

B linear This does not satisfy the stated relationship.

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

D tetrahedral This does not satisfy the stated relationship.

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

20 During a one-minute revision round: Graphite conducts electricity mainly because it has

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

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

C free protons 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