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could you help me with this multiple choice question based on the the Reaction B? In Reaction B, the aqueous Cu(NO3)2 solution is treated with aqueous sodium hydroxide and undergoes an observable double displacement (metathesis) reaction to form the light blue precipitate, copper(II) hydroxide: Cu(NO3)2 (aq) + 2 NaOH (aq)  Cu(OH)2 (s) + 2 NaNO3 (aq)​.

The second reaction is classified as a __________ reaction. Is it a redox reaction?

a) precipitation; no

b) precipitation; yes

c) decomposition; no

d) decomposition; yes

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Nestor Rutherford
Nestor RutherfordLv2
31 Dec 2019

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Related questions


Why did the cobalt precipitate out of solution as sodium hydroxide was added?

A. The cobalt chloride underwent a double displacement reaction and insoluble cobalt hydroxide was formed.

B. The cobalt chloride underwent a double displacement reaction and insoluble sodium chloride was formed

C. The acidic nature of the sodium hydroxide caused the cobalt to precipitate

D. Cobalt undergoes transmutation in the presence of a strong base

Why is only 1 drop of NaOH in molar excess of the concentration of cobalt chloride sufficient to cause a color change?

A. The cobalt hydroxide turns blue when it interacts with excess sodium hydroxide.

B. The cobalt chloride acts as a buffer, absorbing hydrogen ions. When the cobalt chloride is depleted, there is no buffering and the hydrogen ions cause the solution to become more acidic.

C. The cobalt chloride acts as a buffer, absorbing hydroxide ions. When the cobalt chloride is depleted, there is no buffering and the hydroxide ions cause the solution to become more basic.

D. The cobalt hydroxide turns blue when it interacts with thymolphthalein.

The color change and the precipitation occur in which order:

A. The color change occurs after all of the precipitation.

B. The precipitation occurs after the color change.

C. The precipitation occurs both before and after the color change.

D. The color change occurs simultaneous with the precipitation.

For questions 13-14, use the information provided below from the experiment Identification of an Unknown. The molecular masses and reactions are provided for you.

NaHCO3 KHCO3 Na2CO3 K2CO3 NaCl KCl

84.01 g/mol 100.12 g/mol 105.99 g/mol 138.21 g/mol 58.44 g/mol 74.55g/mol

2 NaHCO3 (s) Ã Na2CO3 (s) + H2O (g) + CO2 (g) (Reaction 1)

Na2CO3 (s) +2HCl (aq) Ã 2NaCl (s) + H2O (l) + CO2 (g) (Reaction 2)

13. Brad starts with 0.652 g of unknown. How much mass should he have after the first heating step if his unknown
was NaHCO3?

A. 0.411 g Na2CO3

B. 0.326 g Na2CO3

C. 0.822 g Na2CO3

D. 0.00402 g Na2CO3

14. If Brad has a final mass of 0.270 g at the end of the experiment (after the 2nd heating), what is his percent yield
of the final salt? (Assuming he starts with 0.652 g of NaHCO3).

A. 40%

B. 60%

C. 80%

D. 86%

15. What is the concentration of chloride ions in 50.0 mL of a 5.25 M solution of barium chloride?

A. 0.525 M Cl-

B. 1.05 M Cl-

C. 5.25 M Cl-

D. 10.5 M Cl-

Aqueous Solutions

16. Which of the following represents a correct precipitation reaction between sodium iodide and lead(IV) sulfate?

A. PbSO4 (aq) + NaI(aq) Ã PbI (aq) + NaSO4 (aq)

B. PbSO4 (aq) + NaI(aq) Ã PbI (s) + NaSO4 (aq)

C. Pb(SO4)2(aq) + NaI (aq) Ã PbI2 (s) + Na2SO4 (aq)

D. Pb(SO4)2(aq) + NaI (aq) Ã PbI2 (aq) + Na2SO4 (aq)

17. How many of the following salts would not form a precipitate in an aqueous solution?

A. one

B. two

C. three

D. four

18. What type of reaction is the following? CaCO3 + heat à CaO + CO2

A. Combination

B. Decomposition

C. Single Replacement

D. Combustion

19. Calculate the amount of copper recovered from an 85% yield if the theoretical yield is 0.25 g

A. 21 g

B. 3.4 g

C. 0.21 g

D. 0.34 g

20. Which of the following chemical species is the oxidizing agent in the reaction below?

Cu (s) + 4 HNO3 (aq) → Cu(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l)

A. Cu (s)

B. HNO3 (aq)

C. Cu(NO3)2 (aq)

D. NO2 (g)

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