Basics
While English physicist J. J. Thompson was carrying out experiments on cathode rays, he was able to determine that the rays consisted of particles he called "corpuscles." These particles were later named what?
A student measures the mass of a 1.00 g aluminum rod as 0.99 g. The best estimate of the percent error associated with this measurement is...
1%
How many moles are in 2.04 X 1024 molecules of H2O?
3.39 mol
What is the name of the compound with the formula NH4NO3?
Ammonium nitrate
This equation represents which type of chemical reaction?
Al(s) + 3AgNO3 (aq) --> Al(NO3)3 (aq) + 3Ag(s)
Single Replacement
According to the periodic table, which elements belong to the same period?
Aluminum, Germanium, Antimony, Arsenic, Gallium
Germanium, Arsenic, Gallium
What is the density of an aqueous solution that has a mass of 10.081 g and 12.5 mL?
0.806 g/mL
What volume will 35.9 g of hydrogen gas (H2) occupy at STP?
399 L
Which element will most likely form covalent bonds with fluorine?
a) Carbon b) Potassium c) Neon d) Tin
a) Carbon
Which of these lab techniques is best to separate a solid from a liquid to recover the liquid?
a) Titration b) Chromatograhpy c) Filtering d) Vaporization
c) Filtering
Which element has 16 neutrons, 15 protons, and 15 electrons?
Phosphorus (P)
Calculate the number of moles of Li3PO4 in 2.2L of a 0.60M Li3PO4 solution.
1, 1.3 1.32, 1.33, 1.4, 2
When this equation is balanced, the coefficient in front of H3PO4 is what?
__Ca(NO3)2 + _?_H3PO4 --> __Ca3(PO4)2 +__HNO3
2
What is the name for FeCl3 using the IUPAC nomenclature rules?
Iron(III) chloride
Increasing the volume of a sealed container will cause the gas particles within the container to--
a) form a liquid b) collide more frequently c) increase in molecular attraction d) exhibit lower pressure
d) exhibit lower pressure
What is the oxidation number of an oxide ion?
-2
If 89.6 joules of heat are needed to heat 20.0 grams of iron from 30.0C to 40.0C, what is the specific heat of the iron in J/g X C?
0.448
How many moles of O2 are in the chemical equation when balanced using the lowest whole number?
__C2H4 + _?_O2 --> __CO2 + __H2O
3
What is the name for the compound AlI3
Aluminum iodide
An expandable container of oxygen gas has a volume of 125 mL at a temperature of 25.0C. What volume will the gas occupy at 55.0C?
130, 137, 137.5, 137.6, 138, 140 mL
The most efficient way to determine whether a reaction is an exothermic chemical reaction is to use--
a) an oxygen probe b) a temperature probe c) a pressure probe d) a pH probe
b) a temperature probe
A substance has a molecular formula of C8H10N4O2. The empirical formula is what?
C4H5N2O
A fun sized snickers bar contains 0.0472 moles of sugar (C6H12O0). How many grams of sugar is this?
8.5 g
In the formula for barium chloride, (BaCl2), barium (Ba) is written first because it is--
a) a single atom b) a larger atom c) the positive ion d) the negative ion
c) the positive ion
If the actual melting point is 113C, is this data accurate, precise, or both?
110, 110, 113, 110
precise