LS7A LAUNCHPAD WEEK 1 PRACTICE
QUESTIONS AND CORRECT ANSWERS
2.1 vReview vQuestions v- vCORRECT vANS✔✔4/4
Sometimes, vatoms vgain vor vlose vparticles. vThe vloss vof vwhich vof vthe vfollowing
vwould vresult vin va vchange vof voverall velectrical vcharge? v- vCORRECT
vANS✔✔protons vor velectrons
For van vatom vthat vis vNOT van vion, vwhich vof vthe vfollowing vmust vbe vTRUE? v-
vCORRECT vANS✔✔The vnumber vof velectrons vequals vthe vnumber vof vprotons.
Which vof vthe vfollowing vCORRECTLY vpairs vthe vparticles vof van vatom vwith vtheir
vphysical vproperties? v- vCORRECT vANS✔✔proton-positively vcharged; vneutron-
uncharged; velectron-negatively vcharged
Sometimes, vatoms vgain vor vlose vparticles. vThe vloss vof vwhich vof vthe vfollowing
vresults vin va vchange vof vatomic vmass? v- vCORRECT vANS✔✔a vneutron vand va
vproton
2.2 vReview vQuestions v- vCORRECT vANS✔✔4/4
A vwoman's vdoctor vtells vher vto vgargle vwith vsalt vwater. vShe vstirs va vtablespoon vof
vsalt vinto va vcup vof vwarm vwater vand vwatches vit vdissolve. vWhy vdoes vthe vsalt
vdissolve vin vwater? v- vCORRECT vANS✔✔The vpositive vhydrogen vatoms vin vwater
vmolecules vare vattracted vto vchlorine vions, vand vthe vnegative voxygen vatoms vin vwater
vmolecules vare vattracted vto vsodium vions.
A vmolecule vof vcommon vtable vsalt, vor vNaCl, vis vthe vresult vof v_____ vbond vforming
vbetween va vsodium v(Na) vatom vand va vchlorine v(Cl) vatom. v- vCORRECT vANS✔✔an
vionic
The vstructural vformula vfor vhydrogen vgas v(H2) vis vrepresented vas vH?H. vHere, vthe
vdash v(?) vrepresents va(n): v- vCORRECT vANS✔✔chemical vbond
A vpolar vbond vis vdue vto: v- vCORRECT vANS✔✔uneven vsharing vof velectrons vin va
vcovalent vbond
QUESTIONS AND CORRECT ANSWERS
2.1 vReview vQuestions v- vCORRECT vANS✔✔4/4
Sometimes, vatoms vgain vor vlose vparticles. vThe vloss vof vwhich vof vthe vfollowing
vwould vresult vin va vchange vof voverall velectrical vcharge? v- vCORRECT
vANS✔✔protons vor velectrons
For van vatom vthat vis vNOT van vion, vwhich vof vthe vfollowing vmust vbe vTRUE? v-
vCORRECT vANS✔✔The vnumber vof velectrons vequals vthe vnumber vof vprotons.
Which vof vthe vfollowing vCORRECTLY vpairs vthe vparticles vof van vatom vwith vtheir
vphysical vproperties? v- vCORRECT vANS✔✔proton-positively vcharged; vneutron-
uncharged; velectron-negatively vcharged
Sometimes, vatoms vgain vor vlose vparticles. vThe vloss vof vwhich vof vthe vfollowing
vresults vin va vchange vof vatomic vmass? v- vCORRECT vANS✔✔a vneutron vand va
vproton
2.2 vReview vQuestions v- vCORRECT vANS✔✔4/4
A vwoman's vdoctor vtells vher vto vgargle vwith vsalt vwater. vShe vstirs va vtablespoon vof
vsalt vinto va vcup vof vwarm vwater vand vwatches vit vdissolve. vWhy vdoes vthe vsalt
vdissolve vin vwater? v- vCORRECT vANS✔✔The vpositive vhydrogen vatoms vin vwater
vmolecules vare vattracted vto vchlorine vions, vand vthe vnegative voxygen vatoms vin vwater
vmolecules vare vattracted vto vsodium vions.
A vmolecule vof vcommon vtable vsalt, vor vNaCl, vis vthe vresult vof v_____ vbond vforming
vbetween va vsodium v(Na) vatom vand va vchlorine v(Cl) vatom. v- vCORRECT vANS✔✔an
vionic
The vstructural vformula vfor vhydrogen vgas v(H2) vis vrepresented vas vH?H. vHere, vthe
vdash v(?) vrepresents va(n): v- vCORRECT vANS✔✔chemical vbond
A vpolar vbond vis vdue vto: v- vCORRECT vANS✔✔uneven vsharing vof velectrons vin va
vcovalent vbond
