Thermochem
What is heat measured in?
Joules
What is the oxidation number of oxygen?
-2
What is the unit for frequency?
Hertz (Hz)
How do I find moles?
n = m/M
Is an iron spoon that is silver plated a substance or a mixture. If it is a mixture, indicate whether it is homogenous or heterogeneous
Heterogenous mixture
What is entropy?
- S
- disorder
What is a reducing agent?
The element that becomes oxidized and loses electrons
Describe the wavelength & frequency of X-rays compared to visible light?
- Higher frequency
- Shorter wavelength
What is a limiting reactant?
A reactant that is totally consumed when the chemical reaction is completed. Controls the reaction because amount of product formed is limited by this reagent
How many sig figs in the following?
24.6 + 18.35 -2.98 = ?
3 (ans = 40.0)
What is Heisenburg's uncertainty principle?
We cannot know both the position and speed of a particle, such as a photon or electron. The more you know about one component, the less you know about the other.
Balance the following reaction:
SO3 (g) --> SO2 (g) + O2 (g)
2SO3 (g) --> 2SO2 (g) + O2 (g
Perform the following conversion:
981 cm^3 = _____ L
0.981 L
Write the electron configuration of Pb
[Xe]4f145d106s26p2
Write balanced chemical reactions to represent: the decomposition, by heating, of solid ammonium nitrate to produce dinitrogen monoxide
gas (laughing gas) and water vapor
NH4NO3 (s) -∆-> N2O (g) + 2H2O (g)
Why is francium the largest atom on the periodic table?
- atomic radius
- electron affinity
What is the energy of a wave with 455 nm of radiation?
lkjl
What are the molarities of the following solutions when dissolved in water?
5.2 g CO(NH2)2 in 275 mL of solution
1.53 M
Give the chemical formula for the following: Tungsten (II) hypochlorite
W(ClO)2