Chemistry - things that need polishing Flashcards
What is the bond angle in pyramidal molecules?
107o
In what circumstances do molecules have a pyramidal shape?
Three bonded pairs of electrons and one lone pair
How many electrons does the s orbital hold?
The s orbital holds 2 electrons.
How many electrons does the p orbital hold?
The p orbital holds 6 electrons.
How many electrons does the d orbital hold?
The d orbital holds 10 electrons
How many electrons does the f orbital hold?
The f orbital holds 14 electrons.
What is the chemical formula of bleach?
NaClO
Is oxidation an increase or decrease in oxidation number?
Oxidation is an increase in oxidation number.
Is reduction an increase or decrease in oxidation number?
Reduction is a decrease in oxidation number.
What is the reaction between CO and NO in a catalytic converter?
2CO + 2NO –> 2CO2 + N2
“why would it be difficult to determine the enthalpy change of formation of hexane directly?”
- many different hydrocarbons would form
- activation energy too high
- reaction too slow
- they don’t react together
What is the empirical formula of cyclohexane?
C6H14
What is a reaction of chlorine radicals with ozone in which the chlorine radical is not used up?
Cl + O3 –> ClO + O2
ClO + O –> Cl + O2
overall: O3 + O –> 2O2
What is a reaction of chlorine radicals with methane in which the chlorine radical is not used up?
Cl + CH4 –> CH3 + HCl
CH3 + Cl2 –> CH3Cl + Cl
overall: CH4 + Cl2 CH3Cl + HCl
How do catalysts help make processes more sustainable?
- catalyst not used up in reaction
- reactions can take place at lower temperatures
- different reactions can be used
- less hazardous chemicals
- catalysts or enzymes can generate specific products