Chemistry D425 Verified Multiple Choice and
Conceptual Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. What is the percent composition by mass for N in NH6PO4 - ANSWER
12.18%
2. What is the percent composition for K in KCN? - ANSWER 60%
3. What is the mass of 0.750 moles of ZnSO4? - ANSWER
4. How many molecules are there in 0.435 moles of C6H12O6 - ANSWER
5. What is the molar mass for NH4C2H3O2 - ANSWER
6. What is the percent by mass for Na, P, and O in Na3PO4 - ANSWER
7. What is the volume of 12.54 mol of Kr at STP - ANSWER
8. What describes molar mass - ANSWER Ratio btwn mass and moles
balancing chemical equation
Al+O2 react AlO3
,2Al+O2/2 = Al2O3
2(2Al+O2=Al2O3)= - ANSWER 4Al/4+2O/6=2Al/4O3/6
9. When does a chemical reaction occur? - ANSWER when chemical bonds
are formed or broken by atoms colliding
10. What coefficient needs to be placed in front of the oxygen atom 0n the
products side in order to balance the following equation
KClO3->2KCl+O2 - ANSWER 2in front of the K, you get 2KClO3->2KCl+O2. but
now you have 6 O atoms on the left. to get 6 O atoms on the right, put a 3 in front
of the O2.
11. How is an equation balanced? - ANSWER by comparing the number of
each type of atom in the reactant and products. for an equation to be
balanced the number of atoms for each element in the reaction and the total
charge must be the same for both the reactants and the products
12. What is the balanced product of this equation:
Pb(OH)4+H2SO4-> Pb(SO4)2+H2O - ANSWER Pb(HO)4+2H2SO4-
>Pb(SO4)2+4H2O
Reactant: Pb=1 O=12 H=8 S=2 Products: Pb=1 O=12 H=8 S=2
if you add a 2 in front of H2SO4 = # of S atoms
if you add a 4 in front of H2O on the product side, you will have an equal # of
oxygen and hydrogen atoms on both sides
, 13. What occurs in a decomposition reaction? - ANSWER one substance splits
into two or more simpler substances
14. Synthesis reaction example - ANSWER A + B --> AB
elements or compounds undergo a reaction and combine to form a single new
substance
15. What describes a change in state that is associated with the loss of electrons
- ANSWER oxidation. the loss of electrons by an element and an increase
in oxidation state creates an oxide
16. Redox reactions (oxidation-reduction reactions)
H2+Cl2-> 2HCL - ANSWER chemical reactions that transfer electrons between
reactants
either increase or decrease in order to form a chemical bond with another atom.
H2 has been oxidized, and Cl2 has been reduced, making this a redox reaction
17. What is the correct way to interpret
P4+5O2-> P4O10 - ANSWER one molecule of P4
reacts with 5 molecules of O2
to produce
one molecule of P4O10
Interpret
Conceptual Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. What is the percent composition by mass for N in NH6PO4 - ANSWER
12.18%
2. What is the percent composition for K in KCN? - ANSWER 60%
3. What is the mass of 0.750 moles of ZnSO4? - ANSWER
4. How many molecules are there in 0.435 moles of C6H12O6 - ANSWER
5. What is the molar mass for NH4C2H3O2 - ANSWER
6. What is the percent by mass for Na, P, and O in Na3PO4 - ANSWER
7. What is the volume of 12.54 mol of Kr at STP - ANSWER
8. What describes molar mass - ANSWER Ratio btwn mass and moles
balancing chemical equation
Al+O2 react AlO3
,2Al+O2/2 = Al2O3
2(2Al+O2=Al2O3)= - ANSWER 4Al/4+2O/6=2Al/4O3/6
9. When does a chemical reaction occur? - ANSWER when chemical bonds
are formed or broken by atoms colliding
10. What coefficient needs to be placed in front of the oxygen atom 0n the
products side in order to balance the following equation
KClO3->2KCl+O2 - ANSWER 2in front of the K, you get 2KClO3->2KCl+O2. but
now you have 6 O atoms on the left. to get 6 O atoms on the right, put a 3 in front
of the O2.
11. How is an equation balanced? - ANSWER by comparing the number of
each type of atom in the reactant and products. for an equation to be
balanced the number of atoms for each element in the reaction and the total
charge must be the same for both the reactants and the products
12. What is the balanced product of this equation:
Pb(OH)4+H2SO4-> Pb(SO4)2+H2O - ANSWER Pb(HO)4+2H2SO4-
>Pb(SO4)2+4H2O
Reactant: Pb=1 O=12 H=8 S=2 Products: Pb=1 O=12 H=8 S=2
if you add a 2 in front of H2SO4 = # of S atoms
if you add a 4 in front of H2O on the product side, you will have an equal # of
oxygen and hydrogen atoms on both sides
, 13. What occurs in a decomposition reaction? - ANSWER one substance splits
into two or more simpler substances
14. Synthesis reaction example - ANSWER A + B --> AB
elements or compounds undergo a reaction and combine to form a single new
substance
15. What describes a change in state that is associated with the loss of electrons
- ANSWER oxidation. the loss of electrons by an element and an increase
in oxidation state creates an oxide
16. Redox reactions (oxidation-reduction reactions)
H2+Cl2-> 2HCL - ANSWER chemical reactions that transfer electrons between
reactants
either increase or decrease in order to form a chemical bond with another atom.
H2 has been oxidized, and Cl2 has been reduced, making this a redox reaction
17. What is the correct way to interpret
P4+5O2-> P4O10 - ANSWER one molecule of P4
reacts with 5 molecules of O2
to produce
one molecule of P4O10
Interpret
