Cumulative Exam — Cumulative exam Answers

Which diagram shows electrons violating the Pauli exclusion principle?

Which best describes a compound such as magnesium oxide?

Which of the following best describes a pair of elements that will form an ionic bond?

Which is the first step in the dissolving process?

When a drawing of a circle made in the center of a piece of paper with a black marker gets wet, the marker bleeds, and as the water moves through the paper the ink separates into several colors. What method of separation does this describe?

When chemists convert ethene (C2H2) to ethanol (CH3CH2OH), they have a mixture of the two gaseous substances. Why do chemists then lower the temperature of the mixture?

An element has five valence electrons available for bonding. This element is most likely which of the following?

In the molecules below, areas that have a partial negative charge are pink and areas that have a partial positive charge are blue. The attractive force between these two molecules has most likely been produced by

Which is a feature of a single replacement reaction?

Two students are given two different size blocks of the same substance and are instructed to determine the properties of the substance. Which statement describes a property that will be the same for both students?

A beam of light passes though a liquid in a test tube without scattering. Which type of mixture is most likely in the test tube?

The properties of two elements are listed below.ElementAtomic radius(pm)Ionic radius(pm)First ionization energy(kJ/mol)Electron affinity(kJ/mol)ElectronegativityBr1141951140–3253.0K243152.2418.8–48.40.82Which prediction is supported by the information in the table?

The following half-reaction method is used to balance oxidation-reduction equations.(1) Determine which atoms change oxidation state from reactant to product in the reaction.(2) Identify and write half reactions (oxidation and reduction).(3) Return to the original chemical equation to balance it.(a) Insert the coefficients from the half reactions first.(b) Inspect the number of each atom on each side for all elements.Which important step is missing from this procedure?

Given below is a list of chemical reactions.1. Burning octane fuel2. Forming rust in an iron pipe3. Baking a cake4. Cement hardeningWhich sequence ranks the chemical reactions in order from fastest to slowest?

Which of the following is an oxidation-reduction reaction?

Which statement best explains why the atomic theory developed efficiently?

Catalysts are used in the oil industry to increase octane ratings in gasoline. Octane ratings tell how much fuel has to be compressed to promote better fuel ignition in some cars. Which of the following catalytic effects would be most beneficial for the oil industry?

Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-butanol?

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of electronsNumber of neutrons1393952240405033939544404051Based on the information that is given, which atom in the table has the highest mass?

Consider the following reversible reaction.What is the equilibrium constant expression for the given system?