CHEM 1341 EXAM 2

Redox Rxns

100

is this a reducing or an oxidizing agent:

causes oxidation, gains electron(s), undergoes reduction, oxidation number of the atom decreases

oxidizing agent

200

what is oxidized and reduced?

6Li + N2  --> 2Li3N

oxidized: Li

reduced: N

300

what is oxidized, reduced, and maintained?

CH4 + 2O2 --> CO2  + 2H2O

Oxidized: C

reduced: O

maintained: H

400

what is oxidized, reduced, and maintained?

Zn + 2AgNO3  --> Zn(NO3)2 +2Ag

Zn: oxidized

Ag: reduced

NO3: maintained

500

what is oxidized, reduced, and maintained?

2LiClO3 --> 2LiCl + 3O2

Li: maintained

Cl: reduced

O: oxidized

Solubility

100

is Ca(NO3)2 soluble?

yes

200

what is the net ionic equation for neutralization reactions?

H⁺ + OH^---> H2O

300

what are the solubility rules

Soluble:
Nitrate,Acetate,Group 1 Metals,Sulfate (except when with PMS (Pb, Hg, Ag) and Basurcah (Ba, Sr, Ca)),Ammonium, Group 17 Nonmetals (except when with PMS (Pb, Hg, Ag)) 

Insoluble:

**NAG SAG Overrides

Carbonate, Phosphate, Sulfide (except when with Basurcah (Ba, Sr, Ca)), Hydroxide (except when with Basurcah (Ba, Sr, Ca)

400

what is the net ionic equation for a metathesis rxn between copper nitrate and potassium carbonate

Cu²⁺ + CO₃^2---> CuCO₃

500

what is the net ionic equation for a metathesis rxn between Barium chloride and Silver Nitrate

Cl^- + Ag⁺ --> AgCl

Stoichiometry

100

Given the rxn:

Na2SiO3 + 8HF --> H2SiF6 + 2NaF + 3H2O

How many moles of HF are needed to react with .3 mol of Na2SiO3?

2.4 mol HF

200

Given the rxn:

Na2SiO3 + 8HF --> H2SiF6 + 2NaF + 3H2O

How many grams of NaF form when .5 mol of HF reacts with excess Na2SiO3

5.2485g NaF

300

Automotive air bags inflate when sodium azide, NaN3, rapidly decomposes into its component elements:

2NaN3 --> 2Na + 3N2

How many grams of NaN3 are required to form 285L of N2 gas? (assume the reaction occurs at STP)

827g NaN3

400

-12.0g CO2 reacts with 8.00g H2O to give 7.5g C6H12O6

Determine the percent yield of glucose from this reaction

91.49%

500

Determine the moles of products produced if 181.8g Aluminum nitrate in solution reacts with 102.1g of Calcium hydroxide

.8502mol Al(OH)3

1.2753 mol Ca(NO3)2

Thermochemistry

100

Determine the amount of heat produced by the combustion of 3.3mol of methane 

CH₄ +2O₂ --> CO₂ +2H₂O     ΔH = -891kJ

-2940kJ

200

Determine the mass of H2O produced during an enthalpy change of -423kJ

CH4 + 2O2 --> CO2 + 2H2O    ΔH =-891kJ

17.1g H2O

300

The specific heat of ethanol is 2.46 J/gK. How many joules are required to heat 193g of ethanol from 19*C to 35*C?

7596 J

400

Determine ΔH for the rxn: 2C +B --> 2D

given:

A+B --> C                    ΔH = -100kJ

A + 3/2 B --> D            ΔH -150kJ

-100kJ

500

Calculate the final temperature after 1485J of energy is added to 16.7g of water at 23.4*C

44.7

Exam 1

100

What are the diatomic elements?

Br, I, N, Cl, H, O, F

200

Convert 50 years into seconds. Express your answer in scientific notation.

1.58 x 10⁹ seconds

300

What is the name of this chemical compound:

Fe2O3

Iron (III) Oxide

400

Cl has two isotopes: 

35Cl:75.78%; mass =34.97 amu

37Cl: 24.22%; mass = 36.97 amu

What is the average atomic mass?

35.45

500

what is the chemical name of this compound

HClO4

Perchloric acid