NAS 2 Exam 2025 with correct responses

NAS 2 Exam 2025 with correct responses

True |or |False: |An |Atom |of |one |element |may |be |distinguished |from |an |atom |of |another |element |by
|the |number |of |protons |in |the |nucleus. |- |correct |answer |-True




The |number |of |____ |in |the |nucleus |of |an |atom |determines |the |type |of |element.

a) |Neutrons

b) |Electrons |and |Neutrons

c) |Protons

d) |Neutrons |and |Protons

e) |Electrons |- |correct |answer |-c) |Protons



Which |subatomic |particle |is |negatively |charged, |smaller |than |the |others, |and |does |not |live |in |the
|nucleus?



a) |Electron

b) |Hydrogen

c) |Neutron

d) |Proton

e) |Atom |- |correct |answer |-a) |Electron



Another |name |for |a |hydrogen |ion |is |___.

a) |Proton

b) |Solvent

c) |Electron

d) |Solution

e) |Buffer

f) |Solute

g) |neutron |- |correct |answer |-A) |Proton

, In |what |kind |of |chemical |bond |are |electrons |shared |unequally |between |2 |atoms? |- |correct |answer |-
Polar |covalent |bonds



Which |of |the |following |bonds |holds |together |atoms |in |a |molecule? |- |correct |answer |-Covalent
|bonds




Which |one |is |the |strongest |bond?

a) |hydrogen |bond

b) |covalent |bond

c) |hydrophobic |interaction

d) |acid/base |interaction |bond |- |correct |answer |-b) |Covalent |bond



What |kind |of |chemical |bond |holds |together |two |different |water |molecules? |- |correct |answer |-
Hydrogen |bond



A |____ |is |a |substance |that |can |be |dissolved:

a) |neutron

b) |proton

c) |solution

d) |solute

e) |electron

f) |solvent |- |correct |answer |-d) |solute



Compounds |that |do |not |usually |contain |carbon |and |hydrogen |atoms |as |the |primary |structural
|ingredients |are |called |________ |molecules.



a) |organic

b) |neutral

c) |acidic

d) |inorganic

e) |Basic |- |correct |answer |-d) |inorganic