Most Challenging AP Chem

Which set of atoms/ions could all have the following electron configuration? 1s2 2s2 2p6 3s2 3p6

• Na, Na+1, Ne

• Ne, Ar, Kr

• Ca, Ar, Cl

• Ar, K+1, S-2

Tags

NGSS.HS-PS1-1

What are the values of x and y in the formula Al_x(CO₃)_y

• x=2 y=3

• x=1 y=2

• x=1 y=3

• x=1 y=1

In which polyatomic ion does the sulfur atom have an oxidation number of +4

• hydrogen sulfate

• sulfite

• sulfate

• thiosulfate

In the combustion of methanol, CH3OH, the oxidation number of carbon changes from _________

• 0 to +2

• +2 to 0

• changes from -2 to +4

• does not change, this is not a redox reaction

In the combustion of methanol, CH3OH, _____________

• oxygen is oxidized

• oxygen is reduced

• carbon is reduced

• no elements are oxidized or reduced, this is not a redox reaction

Tags

NGSS.HS-PS1-2

Which net ionic equation represents the chemical reaction between sodium hydroxide and magnesium nitrate in which a precipitate forms?

• Na+1(aq) + (NO3)-(aq) --> Na(NO3)(s)

• Mg+2(aq) + (OH)-(aq) --> Mg(OH)2(s)

• Mg+2(aq) + (NO3)-(aq) --> Mg(NO3)2(aq)

• Na+1(aq) + Mg-2(aq) --> Na2Mg(s)

Which chemical formula below is a empirical formula for the molecular formula C6H12O6

• CH2O

• C2H4O2

• C2H4O

• C2H3O2

In which polyatomic ion does nitrogen have the highest oxidation number?

• ammonium

• hydroxide

• nitrite

• nitrate

In the double replacement reaction between calcium chloride and silver nitrate solutions, a precipitate forms. What compound will be the precipitate?

• calcium chloride

• calcium nitrate

• silver chloride

• silver nitrate

What are the coefficicents that correctly balance the chemical equation: C2H6 + O2 --> H2O +CO2

• 1:3:3:2

• 4:6:8:1

• 2:3:4:2

• 2:7:6:4

Tags

NGSS.HS-PS1-7