Chemistry unit 4
Based on half reaction represented above, which of the following is the balance ionic equation for the oxidation reduction reaction between Al and Sn+2? Al(s) —> Al+3(aq) + 3e- S+2(aq) + 2e- —> Sn(s)
2Al(s) + 3Sn+2(aq) —> Al+3(aq) + 3Sn(s)
Is the reaction between C5H5N represented above, C5H5N acts as what
A brønsted-Lowry base
When students added 2.0 g of NaI crystals to 100 mL of Pb(NO3)2 (aq), A yellow precipitate formed. After the solution was filtered, the yellow solid was dried and weighed. Data from the experiment are shown in the table above. Which of the following claims is best supported by the observations?
A chemical change occurred when a yellow, insoluble compound with a larger mass in the original NaI formed
A student combines a solution of NaCl with a solution of AgNO3, and a precipitate forms. Which of the following is the balance net ionic equation for the formation of the precipitate?
Ag+(aq) + Cl-(aq) —> AgCl(s)
Which of the following identifies as a conjugate acid base pair in the reaction represented above C6H5COOH + NaOH —> C6H5COONa + H2O
C6H5COOH ——————— C6H5COO
When icing plate is placed in an aqueous solution of copper sulfate, elemental copper forms, as represented by the equation above. Which of the following represents the reduction have reaction of the reaction? Zn(s) + CuSO4(aq) —> Cu(s) + ZnSO4(aq)
Cu+2(aq) + 2e- —> Cu(s)
Which of the following represents the oxidation have reaction based on the balanced ionic equation shown above? 5 Fe+2(aq) + MnO4(aq) + 8H+ —> 5Fe+3(aq) + Mn+2(aq) + 4H2O (l)
Fe+2(aq) —> Fe+3(aq) + e-
Which of the following is the correct net ionic equation of the neutralization reaction between hydrofluoric acid and sodium hydroxide in aqueous solution?
H+(aq) + OH-(aq) —> H2O(l)
A baker was half filled with freshly distilled H2O and placed on a hot plate. As the temperature of the water reached 100°C, vigorous bubbling was observed in the beaker. The gaseous contents of the bubbles were analyzed. The presence of which of the following services would support the claim that the observed phenomenon was a physical change?
H2O
Which of the following best describes the process represented above that takes place when NHH3 is added to water?
It is an acid base reaction in which a proton is exchanged from H2O to NH3
Which of the following statements about the reaction represents above is correct 2 Mg + SiCl4 —> 2 MgCl2 + Si
It is an oxidation reduction reaction, Mg is oxidized
When they were action represented above proceeds, he is produced. Which of the following best describes the reaction Zn + 2 HCL —> ZnCl2 + H2
It's oxidation reduction reaction because zinc is oxidized and hydrogen is reduced
A student combined solution of NICO with a solution of AgNO3, and a precipitate forms. Assume that 50 mL of 1.0 M NaCl and 50 mL of 1.0 M AgNO3 were combined. According to the balance equation, if 50 mL of 2.0 M NaCl and 50 mL of 1.9 M AgNO3 Were combined, the amount of precipitate formed would ________________________
Not change, because the amount of AgNO3 did not change
A chemistry teacher carried out several demonstrations, and students record their observations. For one of the demonstrations, a student concluded that a physical change took place, but not a chemical change. Which of the following observations could the student have made of the results of the demonstration?
One piece of solid substance was changed into small pieces
A student combines solution solution of NaCl with a solution of AgNO3, and a precipitate forms. Which of the following is evidence that ionic bonds formed during the precipitation?
The precipitate has a high melting point
A student was given to clear liquids; a colorless liquid and a dark blue liquid. The student was asked to combine the liquids in a beaker and record observations. Which of the following results, if true, would provide the best evidence that a chemical change took place when the liquids were combined?
The resulting liquid was light blue
A student combined to colorless aqueous solutions. One of the solutions contain Na2CO3as a saw you and the other contained HCl. The chemical reaction that took place is represented by the equation below. What experimental result would be evidence that a chemical reaction took place when the solutions were combined?
The resulting solution conducts electricity
According to the balanced Chemical equation above, when 100 mL of .1 M K2SO3 (aq) is mix with 100 mL of .2 M HNO3 (aq) at 30°C and one ATM, the volume of SO2 gas produced is .24 L. If it is assumed that the reaction goes to completion, which of the following changes would double the volume of SO2 produced at the same temperature and pressure?
Using 200 mL of .1 M K2SO3 (aq) and 200 mL of .2 M HNO3 (aq), because these are the required Stoichiometric amounts
