Which equation(s) in the following list represent(s) a double-replacement reacti

Question

Which equation(s) in the following list represent(s) a double-replacement reaction? The total pressure in a mixture of nitrogen and oxygen was found to be 1.40 atm, if the partial pressure of nitrogen was 0.65 atm, what is the partial pressure of oxygen? (A) 0.65 atm (B) 0.75 atm (C) 2.05 atm (D) 0.70 atm Calculate the % of platinum in a gold ring that contains 18.00 g gold and 5.5000 g of platinum. (A) 23.40 (B) 0.2340 (C) 2.340 (D) 2340 A 300.0 mL portion of H O is added to 300.0 mL of 0.250 M H_2SO_4. What is the new molarity? (A) 0.125 M (B) 0.250 M (C) 0.500 M (D) 0.250 M How many milliliters of 0.400 M NaOH are required to completely neutralize 20.00 mL of 0.200 M HCl? (A) 50.0 mL (B) 40.0 mL (C) 20.0 mL (D) 10.0 mL Which of the following is a true statement? (A) Colligative properties are solution properties that depend on the identity of the solute; (B) Colligative properties are solution properties that depend on the concentration of the solute particles; (C) Colligative properties are solution properties that depend on both the concentration and the identity of the solute; (D) All of the above What is the highest energy level for Selenium? (A) 3s^2 (B) 4p^5 (C) 3p^4 (D) 4p^4

Explanation / Answer

Q35

double replacement reactions,a s the name implies, requires a DOUBLE (2X) replace of species

for instance:

AB+ CD = AD + BC will be double replaced

then, from the list

I) is double replacement, sinc eH and K are exchanged for NO3- and OH

ii) this is acutally a decompoistion, since 1 molecule breaks up to 4

iii) can't be douible replacement, since Zn is only 1 species

iv) This is combination, since 2 molecules form 1 molecule

choose only I

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