Matter and Measurement/PBOM
What is the most pure form of matter?
An Element
Which subatomic particles have a mass of 1 amu?
Protons and neutrons
What happens to the entropy when water is going from a liquid to a gas?
It is increasing
Which procedure requires the use of an external electric current to force a redox reaction to occur?
electrolysis
What makes a compound classify as an aldehyde?
The double bonded oxygen on a carbon with a hydrogen attached to it.
How can you separate a mixture of two liquids with different boiling points?
Evaporation or distillation
What is the nuclear charge of a Carbon atom?
Increases!
What is the difference between a voltaic cell and a electrolytic cell?
The salt bridge and the addition of an electric current
What is the chemical name for CH3CH2CH2NH2?
1-propanamide
Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as what?
A mixture!
What is an electron configuration of an atom of Neon in an excited state?
2-7-1
The energy needed to start a chemical reaction is called what?
Activation energy
How does a salt bridge maintains electrical neutrality in the half-cells of a voltaic cell?
It permits the migration of ions.
Why is hexene an unsaturated hydrocarbon?
Because it is double bonded
What can the phase change from gas to solid called?
Deposition
An experiment in which alpha particles were used to bombard thin sheets of gold foil led to the conclusion that an atom is composed mostly of what?
Mostly empty space
A catalyst is added to a system at equilibrium. If the temperature remains constant, the activation energy of the forward reaction does what?
Decreases
As an atom of nitrogen gains electrons, its oxidation number does what?
decreases
A molecule of butane and a molecule of 2-butene both have the same total number of what?
Carbons
Which term is defined as a measure of the average kinetic energy of the particles in a sample?
Temperature
If an atom gains or loses an electron(s), what does it become?
A positive or negative ion
When a reversible reaction is at equilibrium, the concentration of the products and the concentration of reactants must be what?
Constant!
Which process requires energy for a non spontaneous redox reaction to occur?
Electrolysis
Which general formula represents the homologous series of hydrocarbons that includes the compound l-heptyne?
C2H2n-2