Limiting Reactants
This term describes the reactant that is completely used up first in a chemical reaction, stopping the reaction from making more product.
What is limiting Reactant?
When heat is released by the system into the surroundings, the process is known by this term.
What is exothermic?
According to the properties of enthalpy, if you reverse the direction of a chemical reaction, what happens to the sign of its ΔH?
What is it changes to the opposite sign (ΔHforward = –ΔHreverse)?
According to the wave equation, if the wavelength of electromagnetic radiation increases, what happens to its frequency?
What is it decreases?
True or False: As 'n' becomes larger, the atom becomes larger and the electron is further from the nucleus.
What is true?
0Consider the reaction
N2+3H2→2NH3
You start with 3.0 moles of N₂ and 4.0 moles of H₂.
Which reactant is limiting?
What is H2?
A gas sample absorbs 145 J of heat from its surroundings while expanding and doing 85 J of work on its surroundings.
Calculate the change in internal energy (delta E) of the system in Joules.
What is +60J?
Use the following equations to determine ΔH for:
CO(g)+1/2 O2(g)→CO2(g)
Given:
C(s)+O2(g)→CO2(g)ΔH=−393.5 kJ
C(s)+1/2 O2(g)→CO(g)ΔH=−110.5 kJ
What is ΔH=−283.0 kJ?
Arrange the following types of electromagnetic radiation in order of increasing wavelength: Red light, X-rays, Microwaves, Ultraviolet.
What is X-rays < Ultraviolet < Red light < Microwaves?
What are the allowed values of the angular momentum quantum number (l) for an electron in the n = 3 energy level, and what subshell shapes do they correspond to
What are l = 0, 1, 2 (corresponding to s, p, and d orbitals)?
An experiment yields an actual recovery of 4.25 g of product, while the calculated theoretical yield is 5.00 g. What is the percent yield?
What is 85.0%?
How much heat (in Joules) is required to warm a 150.0g block of iron from 20.0°C to 75.0°C? (The specific heat capacity of iron is 0.45J/g-k).
What is 3.7 x 10^3 J (or 3712.5J)?
Find ΔH for the reaction:
2NO(g)+O2(g)→2NO2(g)
Given:
N2(g)+O2(g)→2NO(g)ΔH=+180.6 kJ
N2(g)+2O2(g)→2NO2(g)ΔH=+66.4 kJ
What is ΔH=−114.2 kJ?
What is the energy of a single photon that has a frequency of 7.25 x 10^14 (s-1)
What is 4.80 x 10^-19J?
What is the total number of individual orbitals present in the n = 3 energy level?
What is 9 orbitals?
Determine the theoretical yield of NH₃ (in grams) if 25.0 mol Ca₃N₂ and 60.0 mol H₂O are reacted according to the following balanced reaction. A possibly useful molar mass is NH₃ = 17.031g/mol .
Ca3N2(s)+6H2O(l)→3Ca(OH)2(s)+2NH3(g)
What is 340.62 g NH3?
Calculate the heat (in Joules) needed to warm 250g of water from an initial temperature of 22°C to a final temperature of 98°C
What is 7.9 x 10^4 J (or 79,496 J)?
Determine ΔH for:
N2 (g) + 2O2 (g) → 2NO2 (g)
Given:
1. N2(g) + O2(g) → 2NO(g) ΔH = +180.6KJ
2. NO(g) + 1/2 O2(g) → NO2(g) ΔH = -57.1KJ
What is ΔH=+66.4 kJ?
Calculate the energy of a single photon of blue light with a wavelength of 450nm
What is 4.42 x 10^-19J?
What are the exact values of n and l, and all allowed values of ml, for an electron occupying a 3p orbital
What is n = 3, l = 1, and ml = -1, 0, +1?
Consider the reaction: CaCO3 + 2HCl → H2O + CO2.
If 10.0g of CaCO3 (MM = 100.09g/mol) and 10.0g of HCl (36.46g/mol) are combined, which reactant limits the production of CO2
What is Calcium Carbonate (CaCO3)?
When 4.00g of methylhydrazine (CH6N2, MM=46.1g/mol) is combusted in a bomb calorimeter, the temperature increases from 25.00°C to 39.50°C . If the heat capacity of the calorimeter is 7.794 KJ/°C, calculate the heat of reaction per mole CH6N2.
What is -1.30 x 10^3 KJ/mol (or -1302kJ/mol)?
Using the standard enthalpies of formation:
Calculate ΔH° for the combustion of ethane:
What is −1559.7 kJ?
Calculate the energy change (𝛥E, in Joules) when an electron in a hydrogen atom transitions from the n = 4 energy level to the n = 2 energy level.
Is light absorbed or emitted?
What is -4.09 x 10^-19J and emitted?
According to Hund's Rule, how many unpaired electrons are found in the 2p subshell of a neutral nitrogen (N) atom?
What is 3 unpaired electrons?