BIOS251-EXAM 1 (WEEK 2-CHEM) QUESTIONS WITH CORRECT ANSWERS 2026

BIOS251-EXAM 1 (WEEK 2-CHEM) jk jk jk




QUESTIONS WITH CORRECT ANSWERS jk jk jk




2025 jk


Element jk- jk CORRECT jk ANSWER jk -
a jkform jkof jkmatter jkthat jkcannot jkbe jkbroken jkdown jkany jkfurther jkby jkchemical jkreactions



Atom jk- jkCORRECT jk ANSWER jk -
the jksmallest jkparticle jkof jkan jkelement jkthat jkstill jkhas jkthe jkproperties jkof jkthat jkelement



Protons jk- jk CORRECT jk ANSWER jk -+1 jk charge



Neutron jk- jkCORRECT jk ANSWER jk -neutral jkcharge



Electrons jk- jk CORRECT jk ANSWER jk -much jksmaller jkmass jkthan jkprotons jkor jkneutrons; jk -1 jk charge



Atomic jknumber jk- jk CORRECT jkANSWER jk -number jkof jkprotons jkin jkan jkatom



Mass jknumber jk- jk CORRECT jkANSWER jk -total jknumber jkof jkprotons jkand jkneutrons jkin jkan jkatom



Atomic jkweight jk- jk CORRECT jkANSWER jk -average jkmass jkof jkan jkatom jkof jkthat jkelement



Molecules jk- jk CORRECT jk ANSWER jk -
atoms jkcan jkreact jkwith jkeither jkatoms jkof jkthe jksame jkelement jkor jkatoms jkof jkdifferent jkelements jkto jkcreate
jkmolecul jkes



-
molecules jkare jkatoms jkheld jktogether jkby jkelectron jkbased jkinteractions jkcalled jkintermolecular jkbonds
jk(electrons jkinteract jkwith jkother jkatoms jkto jkform jkbondsgsince jkthey jkare jkthe jkoutermost jksubatomic

jkparticle)




Ions jk- jk CORRECT jk ANSWER jk -
are jkatoms jkor jkmolecules jkwith jkan jkelectrical jkcharge jkwhich jkarises jkfrom jkan jkimbalance jkof jkprotons jkand
jkelectron jks

, Electrolytes jk- jkCORRECT jk ANSWER jk-are jkany jksubstance jkthat jkgives jkoff jkor jkforms jkions jkwhen jkdissolved jkin
jkwater




Ionic jkbonding jk- jk CORRECT jkANSWER jk -- jktypically jkbtw jkmetals jkand jknonmetals

- form jkbtw jkcations jk(pos jkcharge) jkand jkanions jk(neggcharge)

- forms jkby jkthe jktransfer jkof jkelectrons



Covalent jkbonding jk- jk CORRECT jk ANSWER jk -- jktypically jkbtw jknonmetals

- nonmetals jkform jkcovalent jkbonds jkby jksharing jkelectrons jkbtw jkthem, jkas jkopposed jkto jktransferring jkelectrons

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when jkone jkof jkthegatomsgin jka jkbond jkhas jka jkhigher jkaffinity jkfor jkelectrons jkthan jkthe jkother
jk(electronegativity), jkan jkd jka jkpolar jkcovalent jkbond jkis jkformed jkwhere jkelectrons jkare jkshared jkunequally



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when jkboth jknonmetals jkhave jksimilar jkelectron jkaffinity, jka jknonpolar jkcovalent jkbond jkis jkformed, jkwhere jkthe
jkelect jkrons jkin jkthe jkcovalent jkbond jkare jkshared jkequally




Metallic jkbonding jk- jk CORRECT jk ANSWER jk -- jktypically jkbtw jkmetals

- elements jkbroadly jkclassified jkas jkeither jkmetals jkor jknonmetals; jkgrouped jkon jkthe jkperiodic jktable jkas jksuch



Mixture jk- jk CORRECT jk ANSWER jk -
a jkcombination jkof jkmore jkthan jkone jkcompound, jkphysically jkmixed jktogether, jktwo jktypes jkof jkmixtures

1. homogenous

2. heterogenous



Homogenous jkmixture jk- jkCORRECT jk ANSWER jk-
do jknot jkseparate jkover jktime jkand jkcannot jkbe jkseparated jkby jkmost jkmembranes, jkalso jkknown jkas jksolutions



Heterogenous jkmixture jk- jkCORRECT jk ANSWER jk-not jkuniform jkin jktheir jkcomposition



Solution jk- jk CORRECT jk ANSWER jk --
cannot jkbe jkvisually jkdistinguished jkfrom jksolvent jkor jkone jkanother; jkcannot jkbe jkseparated jkby jka jkmembrane;
jkusua jklly jktransparent