Regents Chemistry Review First Half of Year

Atomic Concepts

100

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

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

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

400

In the Gold Foil Experiment alpha particles were shot at a sheet of gold foil.  Most of the particles passed right through the foil while a small number were deflected.  This proved

The atom is mostly empty space. 

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

Periodic Table

100

Which Group 14 element is classified as a metal

What is lead, Pb

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

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

400

A piece of Iron is highly reactive.  This is an example of a __________ property

Chemical

500

Sulfur is an element found within the compound H₂SO_4.  Determine the oxidation number of sulfur within this compound

+6

Chemical Reactions and Naming

100

What is the empirical formula of C₆H₂₂O₄

C₃H₁₁O₂

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 correct chemical name for washing soda.

What is sodium carbonate

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

400

2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g) Identify the type of chemical reaction represented by the equation.

What is decomposition

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)

Chemical Bonding

100

Determine if the compound CH₄ is ionic or covalent AND draw the lewis dot structure for the compound 

Covalent

200

What is the total number of electrons shared between two oxygen atoms in the molecule O₂

What is 4

300

2NaHCO3(s) + heat → Na2CO3(s) + H2O(g) + CO2(g) Determine the total mass of Na₂CO₃ produced if 3360. kilograms of NaHCO₃ reacts completely to produce 360. kilograms of H₂O and 880. kilograms of CO₂.

What is 2120 kg

400

Which formula represents a polar molecule? (1) H2 (3) CO2 (2) H2O (4) CCl4

What is water

500

Determine if the compound NaCl is ionic or covalent AND draw the lewis dot structure for the compound

ionic

Na⁺    [Cl]^-

Physical Behavior of Matter

100

Heat is added to a 200.-gram sample of H2O(s) to melt the sample at 0°C. Determine the total amount of heat required to completely melt the sample.

What is q=mHf, so 66,800J

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

From the image Mr. H draws on the board, provide all intervals which represent an increase of Kinetic Energy and NO CHANGE in the Potential Energy. 

AB, CD, EF

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

Compare the boiling point of a salt water 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)