Redox Reactions
What causes an element to gain electrons?
What is the Reducing Agent?
Element gains electrons = reduced = oxidizing agent
Element the causes it, is the reducing agent and was oxidized.
What SI units need to be used when using the ideal gas law? (Volume, Pressure, Temperature)
Liters (L)
Atm
Kelvin (K)
A negative enthalpy reaction would be considered...
What type of system is a cup of coffee with no lid on it?
An open system
What is the Charge of Hydrogen in the compound MgH2?
What is -1?
HYDRIDE
When pressure in a ball is fixed, the ball seems to decrease in volume when temperature decreases. What law is this an example of?
What is Charle's Law?
What is the equation for this?r
When I hold a hot drink, my hand gets hot. Does the drink undergo an endothermic reaction or exothermic?
What is exothermic?
what are the products of a BALANCED displacement reaction starting with the reactant below?
Cl2 + NaBr →
Cl2 + 2NaBr → 2NaCl + Br2
What element is being reduced in
Br2 + 2KI --> 2KBr + I2
what is Br?
Which gas will effuse the quickest at the same temperature?
N2 or F2
Calculate ΔH°rxn for the combustion of propane (C₃H₈):
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
ΔH°f= -104 0 -393.5 -241.8
ΔH°rxn = -2044kJ
What volume, in Liters, does 1.00 mole of O2 gas occupy at STP (Standard Temperature and Pressure)?
What is 22.4L?
What is the oxidation state of Phosphate in CaPO3?
What is +4?
What is the max amount of volume, in mL, of Fe2O3 can be produced from 4.8L of Fe if temperature and pressure are held at constant?
4Fe + 3O2 → 2Fe2O3
CH4+2O2→CO2+2H2O ΔHrxn= -356kJ
If 15g of CH4 (Amu= 16.04g/mol) was reacted in this reaction, what is the ΔHrxn?
What is -333kJ
The acetylene gas produced from the reaction was collected in a 2.3 L vessel at 26.0 °C and 2.1 atm.
How many grams of H2O must have reacted with CaC2 to produce C2H2?
CaC2(s) + 2H2O -> C2H2(g) + Ca(OH)2(s)
*give the molecular weights*
7.089g --> 2 sigfigs
Find moles of CaC2 using PV=nRT
Convert moles of CaC2 to grams of H2O
What is 7.1g of H2O?
What is the oxidative half cell reaction of
6H+ + Fe2+ + ClO3- --> Fe3+ + Cl- + 3H2O
What is
Ox: 6Fe2+ --> 6Fe3+ + 6e-
If a fixed gas is in a 2.15m3 container at a temperature of -9.85 degrees celsius and 0.386 atm, what is the volume of the gas at 21.4 degrees and a new pressure of 1.76 atm in liters?
527 Liters
When 514J of heat are added to water, the temp rises from 32.2 to 55.5 degrees celsius. The heat capacity of H2O is 4.184 (J/g*k).
How many grams of water are in the sample?
What is 5.28 grams?
q=mCsΔT
What is the ΔHrxn when this reaction takes place in a 2.0L vessel at 23 degrees celsius and 1.6 atm?
CaC2 + 2H2O → C2H2 + Ca(OH) ΔHrxn= -154.2kJ
PV=nRT
n=0.132 moles CaC2
ΔHrxn= -20