Foundation
Matter & Energy
Periodic Table
Nomenclature
Mols
100
Round the following number to 3 significant figures: 65.749
What is "65.7"
100
What form of energy is stored in the bonds of molecules?
What is "chemical energy"
100
What is the name of group 2A of the periodic table?
What is "alkaline earth metals"
100
Which transition metals only form one kind of ion?
What is "Zn 2+, Ag +"
100
How many raccoons would there be in 2 mols of raccoons?
What is "(6.022 x 10^23) x 2 = 1.2044 x 10^24"
200
Express this number in decimal notation: 1.18 x 10^11
What is "118,000,000,000"
200
Name 2 properties of solids.
What is "atoms are spaced close together, definite shape, definite volume, incompressible, vibration of particles around a fixed point"
200
Which of the following pair of elements would you expect to be the most similar? a.) Si & P; b.) N & Ni; c.) Cl & F
What is "c - elements in the same group have similar properties"
200
In molecular compounds, there is a certain order in which we write the non-metals. What is the rule here?
What is "list the more metal-like element first, table 5.1 in the book"
200
What is the mass of 1 mol of molecules of CH2Cl2?
What is "84.93g"
300
What is the difference between a scientific theory versus a law?
What is "law = brief statement that summarizes past observations and predicts future ones (law of conservation of mass); theory = provides a broader and deeper explanation for observations and laws, models of the way nature is, often predict behavior (atomic theory: all matter composed of atoms)"
300
Which of the following items is an example of a pure substance? a.) baking soda, b.) coffee, c.) air, d.) methane
What is "a & d - pure substances can be either elements or compounds; as opposed to mixtures (heterogeneous or homogeneous)"
300
What is the charge on a tellurium ion with 54 electrons?
What is "2-"
300
Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.57 kg of fluorine. A second sample produced 1.32 kg of magnesium. How much fluorine (in grams) did the second sample produce?
What is "mass of F/mass of Mg = 2.57/1.65 = 1.56 --> this is the ratio we're looking for; mass of F / 1.32 = 1.56, mass of F = 2.06 kg; Law of Constant Composition"
300
A pure silver ring contains 0.0134 mmol (millimol) of Ag. How many silver atoms does it contain?
What is "0.0134 mmol Ag x (1 x 10^-3 mol Ag/1 mmol Ag) x (6.022 x 10^23 Ag atoms/1 mol Ag) = 8.07 x 10^18 Ag atoms"
400
Perform the following conversion: 1.01 x 10^(-1) seconds to nanoseconds.
What is "1.01 x 10^8 ns"
400
How much energy (in J) is lost when a sample of iron with a mass of 25.7g cools from 75 degrees C to 22 degrees C? (Iron heat capacity: 0.449 J/g deg C)
What is "What is "q = m x C x (Tf - Ti) = 25.7 x 0.449 x -53 = -612 J"
400
Plutonium-239 is used in nuclear bombs. Determine the number of protons and neutrons in plutonium-239 and write out another way to represent this isotope.
What is "protons = 94, neutrons = 145; symbol = Pu, top left 239, bottom left 94"
400
What is the name of the following acid? HClO
What is "hypochlorous acid; hypochlorite, -ite turns into -ous"
400
How many titanium atoms are in a pure titanium bicycle frame with a mass of 1.28 kg?
What is "1.28 kg Ti x 1000g/1kg x 1 mol Ti/47.88g Ti x (6.022x10^23 Ti atoms)/1 mol Ti = 1.61 x 10^25 Ti atoms"
500
A house has an area of 215 meters squared. How many decimeters squared would this be?
What is "2.15 x 10^6 dm squared (1 m = 10dm)"
500
What is the temperature change in Celcius when 29.5 L of water absorbs 2.3 kWh of heat? (1 kWh = 3.60 x 10^6 J)
What is "2.3 kWh x (3.60 x 10^6 J/1 kWh) = 29.5 L x 1000 mL/1 L x 1.00g / 1ml x 4.184 J/g deg C x change in Temp; change in temp = 67 degrees C" kilowatt hour = kWh
500
Copper has 2 naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic weight of copper to determine the mass of the other copper isotope.
What is "100-69.17 = 30.83%; (0.6917x62.939)+(0.3083 x mass of 2nd isotope) = 63.55 amu; solve for mass of 2nd isotope = 64.92 amu"
500
Name this compound: Cr2O3
What is "chromium (III) oxide; chromium can form both 2+ and 3+ ions"
500
Lead is found in Earth's crust as several lead compounds - one of them is cerussite. Calculate the mass (in kg) of PbCO3 (cerussite) that contains 1.0 x 10^3 kg of lead.
What is "1.0 x 10^3 kg Pb x (1000g/1kg) x (1 mol Pb/207.2 g Pb x (1 mol PbCO3/1 mol Pb) x (267.2g PbCO3/1 mol PbCO3) x (1 kg/1000g) = 1.3 x 10^3 kg PbCO3
M
e
n
u