What is names for phase changes (s --> l, l --> g, g--> s, s-->g)
100
Two basic properties of the gas phase are
What is no definite shape and no definite volume
100
Name the compound NO5
What is nitrogen pentoxide
100
Sb+O2=Sb4O6
What is 4Sb+3O2=Sb4O6
200
The total mass of the protons in an atom of gold-198 is approximately
What is 198 amu
200
an evenly combined, uniformly distributed mixture that have identical compositions and properties throughout
What is homogeneous mixture
200
The kinetic molecular theory assumes that ideal gas particles have
1. little attraction and significant volume
2. little attraction and insignificant volume
3. strong attraction and significant volume
4. strong attraction and insignificant volume
What is electrons return from the excited state and emit colors
300
heat is __________ by the system when a substance melts
What is absorbed
300
A sealed container has 1 mole of helium and 2 moles of nitrogen at 30*C. When the total pressure of the mixture is 60 kPa, what is the partial pressure of nitrogen?
What is 40
300
Provide the formula for hydrosulfuric acid
What is H2S(aq)
300
When 2.5 moles of calcium carbonate decompose according to the following equation, how many moles of CO2 is formed?
CaCO3=CaO+CO2
What is 2.5 mol CO2
400
Write the quantum numbers for the 3p orbital (first electron in the last bed facing up)
What is n=3, l=1, ml=1, ms=+1/2
400
What is the minimum number of kiloJoules needed to change 40.0 grams of water at 100*C to steam at the same temperature and pressure?
What is 904
400
The percent by mass of water in BaCl2 * 2H20 (formula mass=243) is equal to
What is 36/243 *100
400
Provide the formula for tin (IV) iodide
What is SnI4
400
If 20.0g of CH3CHO and sufficient oxygen are added to the reaction vessel, how many grams of HC2H3O2 will be produced?
CH3CHO+O2=HC3H3O2
What is 27.3 g HC2H3O2
500
Which q#s can describe a valence electron in selenium
What is 4, 1, 0, +1/2
500
State the endothermic and exothermic phase changes
What is endothermic: s to l, l to g, s to g; exothermic: g to l, l to s, g to s
500
A 48.0 g gas sample of Neon is at STP. If the temperature is changed to 298 K and the pressure is doubled what is the final volume?
What is 14.54
500
Name the compound Pb(SO4)2
What is lead (IV) sulfate
500
Find the theoretical and percent yields
What is the percent yield of water of you react 40.0 g of hydrogen with an excess of oxygen and get 340. g of water?
2H2+O2=2H2O