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WorksheetsAP Chem Unit 4
Total questions: 24
Worksheet time: 12mins
Does the following indicate a physical or chemical process: Burning wood
Chemical
Physical
Does the following indicate a physical or chemical process: A change in color
Chemical
Physical
Does the following indicate a physical or chemical process: Changes in intermolecular interactions
Chemical
Physical
If you have 4g of CH4 and 4g of 02, identify how many grams CO2 and H2O are produced according to the following unbalanced reaction: CH4 + 02-> CO2 + H20 and identify the limiting reactant.
02, 2g CO2, 2.25g H20
02, 2.25g CO2, 2g H20
CH4, 8g CO2, 9g H20
CH4, 9g CO2, 8G H20
If you have 10g of C2H6 and 8g of 02, identify how many grams of CO2 and H20 are produced according to the following unbalanced reaction: C2H6 + 02-> CO2 + H20 and identify the limiting reactant.
C2H6, 18g CO2 + 29.33g H20
C2H6, 29.33g CO2 + 18g H20
02, 6.28g CO2 + 3.86g H20
02, 3.86g H20 + 6.28g CO2
A student reacts 4g of H2 with 32g of 02 according to the following balanced reac-
tion: 2H2 + 02 = 2H20. If the student gets 30g of H2O, what is their % yield?
44.44%
50%
83.33%
94.44%
What is the equivalence point in a titration?
Where the concentration of the solutions are equal.
Where the color of the reacted solution changes.
Where the volumes of the solutions are equal.
Where the # of the moles of the reactants are equal.
A student titrates 20mL of KC6H702 of unknown concentration with 15mL of 1M
HCl, at which point the equivalence point is met. Calculate the concentration of the KC6H702.
1M
.5M
.75M
1.25M
Which of the following is always true for a chemical change?
Bonds within molecules are broken or formed.
The substance changes state, such as solid to liquid.
The composition of the substance remains the same.
No energy is absorbed or released.
Dissolving salt in water is always a chemical change.
True
False
Combustion is a ________ change, while melting is a ________ change.
chemical; physical
physical; chemical
cemical ; fisicle
Which of the following is a correct net ionic equation?
NaCl(aq)+AgNO3(aq)→NaNO3(aq)+AgCl(s)
Cl−(aq)+Ag+(aq)→AgCl(s)Cl−(aq)+Ag+(aq)→AgCl(s)
Na+(aq)+NO3−(aq)→NaNO3(aq)
H2O(l)→H+(aq)+OH−(aq)
Strong electrolyte
Dissociates completely.
Partially dissociates.
Does not dissociate appreciably.
Weak electrolyte
Dissociates completely.
Partially dissociates.
Does not dissociate appreciably.
Insoluble compound
Dissociates completely.
Partially dissociates.
Does not dissociate appreciably.
Which feature is required in a particulate representation of a chemical reaction?
Conservation of matter
Excess reactants must be hidden
Only products are shown
Unbalanced equations are acceptable
In a reaction between hydrogen gas and oxygen gas to form water, excess oxygen will not appear in the particulate representation.
True
False
Which of the following represents in which a species is reduced?
Ca(s) → Ca2+
Hg(l) → Hg 2+
Fe2+ (aq) → Fe3+ (aq)
NO3(-)(aq) → NO (g)
A Brønsted-Lowry Acid ______
Recieves a proton
Shares a proton
Donates a proton
All of the above
A conjugate base ______
Lost an electron when reacting
Lost a neutron when reacting
Did not change when reacting
Lost a proton when reacting
The half-reactions for the oxidation-reduction reaction between Al(s) and Zn2+ (aq) are represented above. Based on the half-reactions, what is the coefficient for Al if the equation for the oxidation-reduction reaction is balanced with the smallest whole-number coefficients?
1
2
3
4
A student titrates 25 mL of HClHCl with NaOHNaOH. If the equivalence point is reached after adding 50 mL of 0.1 M NaOH0.1MNaOH, what is the concentration of the HClHCl?
0.05M
0.1M
0.2M
0.5M
If 4 moles of NH3NH3 react with O2O2 to produce N2N2 and H2OH2O, how many moles of H2OH2O will form?
4
6
8
10
Which of the following is true about particulate representations of chemical reactions?
Only products need to be shown in the diagram.
Unbalanced equations are acceptable if conservation of mass is observed.
Reactants and products must be shown with correct formulas and quantities.
Particulate diagrams cannot include excess reactants.
