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Chem 115 Exam 1

QuestionAnswer
Renewable fuels
Nonrenewable fuels
Define and differentiate between hypothesis, theory, and law
Identify the principle sources of energy used in the USA
In general, how has the climate varied over the past 500,000 years
What evidence indicates the climate is growing warmer
Describe the factors that are responsible for the Earth's energy balance
Describe the change in CO2 concentrations in the atmosphere over the past 350 years
Identify the greenhouse gases
How would you round 6.5 to one significant figure? 6
How would you round 7.5 to one significant figure? 8
Describe the rule for significant figures when multiplying/dividing and subtracting/adding
What is an isotope?
What are the units of molar mass g/mol
What is the ideal gas law and what are its variables? PV=nRT P(atm); V(L); n(mol); R(0.082); T(K)
How do nuclear changes differ from chemical changes 1. Atoms do not change identity in chemical reactions, whereas in nuclear reactions they do 2. Nuclear reactions release a greater amount of energy than chemical reactions
Define radioactivity
nucleon
nuclide
Add 4/2 He2+ ... lose 4 mass number; lose 2 p+ alpha decay
Loss of an electron beta emission
When a positron and an electron meet, what kind of particle is emitted gamma
Why is radioactive decay a first order process
decay rate
specific activity
How is mass defect related to nuclear binding energy
What is fission
What is fusion
What is the current application of fission
What is a potential application of fusion
Which is not consistent with the global warming model? a. CO2 levels increasing faster than can be accounted for b. snow and glacial coverage decrease c. global average air temp. rise d. global avg ocean temp decrease e. sea ice extent decrease d. global avg ocean temp. decrease
Formula for molarity M=L/mol
Which doesn't lead to the release of CO2 when used as fuel in combustion engines or power stations? a. coal b. ethanol c. gasoline d. natural gas e. enriched uranium dioxide e. enriched uranium dioxide
positron emission lose an e-
electron capture opposite of beta emission...
Which nuclide(s) would you predict to be stable? a. 20/8 O b. 59/27 Co c. 9/3 Li
What's the difference between precision and accuracy? Precision hits the same area; Accurate hits the correct area
The recent rise in CO2 level coincides with what event in history? The industrial revolution
What is used to analyze ice cores 16 O/18 O ratios
How do you calculate the nuclear biding energy? given mass -(#protons(mass proton)+#neutrons(mass neutron))= mass change in amu; convert to kg by dividing by constant (1 amu = 1.661E-27 kg) E=mc^2 Multiply m(kg) by c(3E8)^2 =Binding energy in J
ln(N/N(o))=-kt and kt(1/2)=ln2 how to calculate half life!
Created by: jkmccord11