Cumulative Exam — Cumulative exam Answers

Which task most likely involves a calculation that uses moles?

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

Francine makes several measurements of the mass of a metal block. The data set is shown in the table below.MeasurementMass of metal block (g)120.73220.76320.68420.75After analyzing this data set, Francine calculates a value of 20.73 g. Which of these characteristics has been calculated?

Which compound contains both sigma and pi bonds?

The diagram below compares hypotheses, theories, and laws.What term is missing from the central region that describes hypotheses, theories, and laws?

Which is true of transition metals when moving from left to right on the periodic table?

What is the element Ar classified as in the periodic table?

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?

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 element would most likely have chemical properties similar to that of fluorine (F)?

An electron in a hydrogen atom moves from level 1 to level 4. The electron then drops from level 4 to level 2. Which statement describes the most likely result?

In an investigation with density, Marcia’s teacher measures the mass and volume of 10 different samples of a substance. The samples are numbered 1 through 10. Then, the teacher makes the graph that is shown below.What is the independent variable in this investigation?

The chemical equation below shows the combustion of methane (CH4).CH4 + 2O2 CO2 + 2H2OThe molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of carbon dioxide (CO2) is 44.01 g/mol. What mass of CO2, in grams, will form when 8.94 g O2 completely react?

The first known telescopes, used around 1600, consisted of a lens and an eyepiece. Today, telescopes are often computer controlled and consist of a complicated array of sophisticated lenses. Which statement correctly describes how telescopes have changed over time?

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?

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?

Rebekah finds that a solution of sugar in water has a volume of 1.32 fl. oz. How should she report this amount using the metric system? (1 fl. oz. = 29.6 mL)

A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. Which action would be most important to perform in a controlled experiment?

Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO).2Mg + O2 2MgOThe molar mass of O2 is 32.0 g/mol. What mass, in grams, of O2 is required to react completely with 4.00 mol of Mg?