Explain, in terms of subatomic particles, why the radius of a chloride ion is larger than the radius of a chlorine atom.
What is the ion has gained an electron
100
Which Group 14 element is classified as a metal
What is lead, Pb
100
Describe a laboratory procedure that can be used to recover the solid solute from the
aqueous solution.
What is evaporation, boiling, or distillation
100
Explain, in terms of valence electrons, why the bonding in magnesium oxide, MgO, is
similar to the bonding in barium chloride, BaCl2
What is Mg and Ba both have 2 valence electrons
100
Heat is added to a 200.-gram sample of H2O(s) to melt the sample at 0°C. Then the
resulting H2O(ℓ) is heated to a final temperature of 65°C.
Determine the total amount of heat required to completely melt the sample.
What is q=mHf, so 66,800J
200
An atom in an excited state has an electron configuration of 2-7-2.
Explain, in terms of subatomic particles, why this excited atom is electrically neutral.
What is the electrons equal the number of protons
200
Which characteristics tend to decrease
when the elements in Period 3 on the Periodic
Table are considered in order from left to right?
What is metallic character and atomic radius
200
The Solvay process is a multistep industrial process used to produce washing soda,
Na2CO3(s). In the last step of the Solvay process, NaHCO3(s) is heated to 300°C, producing
washing soda, water, and carbon dioxide. This reaction is represented by the balanced
equation below.
2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g)
Write the IUPAC name for washing soda.
What is sodium carbonate
200
What is the total number of electron pairs shared between the carbon atom and one of
the oxygen atoms in a carbon dioxide molecule?
What is 2
200
Heat is added to a 200.-gram sample of H2O(s) to melt the sample at 0°C. Then the
resulting H2O(ℓ) is heated to a final temperature of 65°C.
Show a numerical setup for calculating the total
amount of heat required to raise the temperature of the H2O(ℓ) from 0°C to its final temperature.
What is q=mCT, or 54,340 J
300
An atom in an excited state has an electron configuration of 2-7-2.
Write the electron configuration of this atom in the ground state.
What is 2-8-1
300
An atom of which element has the greatest
attraction for electrons in a chemical bond?
What is Fluorine because it has the highest electronegativity
300
Glycine, NH2CH2COOH, is an organic compound found in proteins. Calculate the gram-formula mass of glycine. Your
response must include both a numerical setup and the calculated result.
What is 75 g/mole
300
2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g)
Determine the total mass of washing soda produced if 3360. kilograms of NaHCO3 reacts
completely to produce 360. kilograms of H2O and 880. kilograms of CO2.
What is 2120 kg
300
Compare the amount of heat required to vaporize a 200.-gram sample of H2O(ℓ) at its
boiling point to the amount of heat required to melt a 200.-gram sample of H2O(s) at its
melting point.
The heat of vaporization is higher, so it takes more heat to vaporize than it does to melt.
400
The gold foil experiment led to the conclusion
that each atom in the foil was composed mostly
of empty space because most alpha particles
directed at the foil
What is went directly through the foil
400
Identify one physical property of copper that makes it a good choice for uses that are
not related to electrical conductivity.
What is shiny, conducts heat, hard metal
400
2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g)
Identify the type of chemical reaction represented by the equation.
What is decomposition
400
Which formula represents a polar molecule?
(1) H2 (3) CO2
(2) H2O (4) CCl4
What is water
400
In a laboratory, a student makes a solution by completely dissolving 80.0 grams of
KNO3(s) in 100.0 grams of hot water. The resulting solution has a temperature of 60.°C.
Classify, in terms of saturation, the type of solution made by the student.
What is unsaturated
500
The light emitted from a flame is produced
when electrons in an excited state
What is fall back to the ground state and release energy
500
Two sources of copper are cuprite, which has the IUPAC name copper(I) oxide, and
malachite, which has the formula Cu2CO3(OH)2. Copper is used in home wiring and
electric motors because it has good electrical conductivity.
Determine the oxidation number of oxygen in the carbonate ion found in malachite.
What is -2
500
2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g)
State evidence that indicates the entropy of the products is greater than the entropy of
the reactant.
What is phase change from solid to gas and 1 reactant to several products (increase in disorder)
500
Two categories of compounds are
What is ionic and covalent or molecular
500
Compare the boiling point of the solution at standard pressure to the boiling point of
water at standard pressure.
What is boiling point of a solution is always higher than that of water (and the melting point is always lower)