A reaction that produces a gas is carried out in a sealed vessel on a balance. What happens to the mass the balance shows, as the reaction proceeds?
It does not change
100
How many unpaired electrons does a ground state N atom have?
3
100
What is the average kinetic energy per particle more commonly called?
Temperature
100
What type of bonding would you expect to exist in a sample of bronze?
Metallic bonding
100
What property is measured on the x axis of the Maxwell Boltzmann distribution?
Kinetic energy (of a particle)
200
Which of these is a weak acid? C6H12O6, H2SO4, HNO3, HF, HClO4
HF
200
Which of the subshells in the 3rd shell is destabilized the LEAST by inner electrons?
The 3s subshell
200
What happens to the enthalpy of a system during an endothermic process?
It increases
200
What is the missing word?
Breaking bonds __________ energy
"requires" or "needs"
200
What separation technique would be used to separate a volatile solvent from a non-volatile solute?
Distillation
300
What is the formula of the precipitate formed when ammonium sulfate solution reacts with strontium nitrate solution?
SrSO4
300
Out of C, Si and P: which has the highest electronegativity?
C
300
What is the sign of "delta H of vaporization" and how does its magnitude compare to "delta H of fusion" for a typical substance?
The sign is positive (endothermic) and it is generally greater than "delta H of fusion"
300
What do you call a covalent bond where both electrons come from one atom?
Dative bond
300
Which of the following is best explained using the particle model of light:
interference patterns of light through diffraction gratings, photoelectric effect,
hydrogen emission lines,
missing frequencies in the spectrum of the sun
photoelectric effect
400
How many moles of oxygen gas are required to completely burn 4 moles of methanol (CH3OH)?
2CH3OH + 3O2 gives 2CO2 + 4H2O
6moles of O2 are required
400
Which of these elements has the lowest first ionization energy: Mg, Al, Si, P, B, C, N ?
Al (dip after Mg)
400
How do you calculate the enthalpy change of a reaction, using the standard enthalpy change of formation of the reactants and products of the reaction?
Enthalpy change of reaction = sum of standard enthalpy change of formation of products - sum of standard enthalpy change of formation of reactants
400
Which of these species has an atom with an expanded octet?
ozone, triiodide ion, selenium dichloride, arsenic trifluoride
triiodide ion
400
What are the particles that conduct electricity when a strong electrolytes dissolve in water?
(free) ions
500
What piece of glassware is used to make up an exact 1.000M solution of NaCl(aq)?
Volumetric flask
500
What is the correct explanation for why a sulfide ion has a larger radius than a sulfur atom?
Increased electron-electron repulsion in the outer shell
500
For an exothermic reaction where the system does work on the surroundings, how does the internal energy change of the system compare to the enthalpy change of the system?
The internal energy change (negative) is larger in magnitude than the enthalpy change (also negative)
500
Which of these species displays resonance?
phosphorus pentachloride, phosphate ion, tetraphosporus decoxide, carbon monoxide
phosphate ion
500
What is the other particle that is emitted, along with an electron, when a neutron turns into a proton in the nucleus of an unstable atom such as C-14? Be specific