Exam #2 Review

¡Supera tus tareas y exámenes ahora con Quizwiz!

Which element is reduced in the following reaction? 3Fe(NO3)2 (aq) + 2Al (s) ----> 3Fe (s) + 2Al(NO3)2 (aq)

Fe is reduced

How many moles of hydrogen atoms are in 2 mol of dimethylsulfoxide? (C2H6SO)

There are 12 moles of hydrogen atoms.

The mass of one molecule of C3H6O is _____?

58 amu or 9.644 x 10^-23 g

Calculate the % hydrogen in glucose (C6H12O6)

6.73 % H

What type of reaction is the following? MgCl2 (aq) + NaCO3 (aq) ---> MgCO3 (s) + 2NaCl (aq)

precipitation reaction

What is the oxidation number of carbon in C2O4 (charge of 2-)

+3

What is the oxidation number of sulfur in H2SO4?

+6

What is the oxidation number of nitrogen in N2H4?

-2

What mass of KCl is needed to precipitate the silver ions from 35.0 mL of .2 M AgNO3 solution?

.225 g of KCl

A solution has molar concentration 2.00 M. A .200-L sample of this solution is diluted to a volume of .800L. What is the molar concentration of the diluted solution?

.5 M

Calcium carbide (CaC2) reacts with water to produce acetylene and calcium hydroxide: CaC2 (s) + 2H2O (g) ---> Ca(OH)2 (aq) + C2H2 (g) Calculate the mass of water required to make 39.00 g of calcium hydroxide.

18.97 g H2O

How many moles of NH3 can be produced by the reaction of 3.5 mol of N2 with 4.0 mol of H2 via the equation below? (there is a limiting reactant) N2 + 3H2 ----> 2NH3

2.667 moles of NH3 can be produced

What is the mass percentage of H in ethane? (C2H6)

20.15 % (6.06 g/ 30.08 g)

How many moles of CO2 are produced when .425 mole of octane burns in the following reaction? 2C8H18 (l) + 25O2 (g) ----> 16CO2 (g) + 18H2O (g)

3.4 moles of CO2

A solution is prepared by dissolving 80.0 g of sodium hydroxide in water to a total volume of .500 L. The formula weight of NaOH is 40.0 g/mol. What is the molar concentration of the solution?

4.0 M NaOH

If the formula weight of C3H6O is 58.08, what is the mass of 1.5 moles of C3H6O?

87.12 g (58.08 g x 1 mol C3H6O/58.08 g x 1.5)

What is a base?

A substance that increases the concentration of OH when dissolved in water. It also accepts a H+ ion.

Predict the product in the combination reaction below. Al (s) + N2 (g) --->

AlN

A molecule has an empirical formula of CH2 and a molecular mass of 84 amu. What is its formula?

C6H12 (84 amu/ 14.03 amu = 6, so multiply everything by 6)

What is the empirical formula of a compound that contains 40.0% C, 6.70% H, and 53.3% O by mass?

CH2O

The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and CaCl2 are mixed is ____.

Ca (charge 2+) (aq) + CO3 (aq) ---> CaCO3 (s)

The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of CaCl2 and LiCO3 are mixed is ______.

Ca (charge 2+) (aq) + CO3 (charge 2-) (aq) ---> CaCO3 (s)

Which ion(s) is/are spectator ions in the following reaction? Mg(OH)2 (s) + 2HCl (aq) ---> MgCl2 (aq) + 2H2O (l)

Cl- is a spectator ion

Which of the following is not an electrolyte? A) KOH B) NaCl C) HCl D) CH4 E) H2SO4

D) CH4

What dissolved species are present in a solution of K2CO3?

K (1+) ions and CO3 (charge 2-) ions

Which ion(s) is/are spectator ions in the following reaction? BaCl2 (aq) + Na2SO4 (aq) ---> BaSO4 (s) + 2NaCl (aq)

Na+ and Cl- are both spectator ions

Which element is oxidized in the following reaction? P4 (s) + 10HClO (aq) + 6H2O (l) ---> 4H3PO4 (aq) + 10HCl (aq)

P is oxidized

What is the net ionic equation of ZnBr2 (aq) + 2KOH (aq) ---> Zn(OH)2 (s) + 2KBr (aq)

Zn (charge 2+) (aq) + 2OH (charge 1-) (aq) ---> Zn(OH)2 (s)

In which of the following does hydrogen have oxidation number -1?

a.) KH

In a titration of 20.00 mL of 0.5000 M HI, ______ mL of a 2.000 M KOH solution is required for neutralization. a. 40.00 b. 5.000 c. 20.00 d. 80.00 e. 10.00

b. 5.000

Which of the following is a strong electrolyte? a. H3PO4 b. HBr c. NH3 d. CH3OH e. HF

b. HBr

What type of reaction is the following? Mg (s) + 2HCl (aq) ----> MgCl2 (aq) + H2 (g) a. combination b. oxidation/reduction (redox) c. acid/base d. decomposition e. precipitation

b. oxidation/reduction (redox)

A solution of a strong electrolyte exists predominantly as ________ in solution. a. molecules b. atoms c. ions d. isotopes e. electrons

c. ions

What type of reaction is the following? Ca(OH)2 (aq) + 2HBr (aq) ---> CaBr2 (aq) + 2H2O (l)

neutralization (acid/base)

What type of reaction is the following? Mg(OH)2 (s) + 2HNO3 (aq) ---> Mg(NO3)2 (aq) + 2H2O (l)

neutralization (acid/base)

What type of reaction is the following? 2HCl (aq) + 2Ca (s) ---> CaCl2 (aq) + H2 (g)

redox reaction

What type of reaction is the following? 2HCl (aq) + 2Li (s) ---> 2LiCl (aq) + H2 (g)

redox reaction


Conjuntos de estudio relacionados

Human Nutrition Chapter 10: Water Soluble Vitamins

View Set

LEED Green Associate Sample Exam Questions

View Set

PFLC INFORMÁTICA II Bloque 1 Algoritmos (respuestas sin acentos)

View Set

Chapter 4- The General Journal and the General Ledger

View Set

Hands-On Ethical Hacking and Network Defense, 3e, Ch. 4 Solutions

View Set

CompTIA Project+ Cert Study Guide

View Set