Question 1

A neutral compound is formed between iron(III) ions and oxide ions. What is the simplest whole-number ratio of Fe$$^{3+}$$ ions to O$$^{2-}$$ ions in this compound?

Accepted Answer

$$2:3$$

Question 2

Which experimental evidence most strongly led scientists to describe light as having both wave and particle properties?

Accepted Answer

Data collected from many experiments could not be explained using waves.

Question 3

Which of the following is a valid set of quantum numbers for an electron in an atom?

Accepted Answer

$$n = 4,\ l = 3,\ m = 3$$

Question 4

Which action is essential for scientific progress and the advancement of knowledge?

Accepted Answer

They share their experimental results with other researchers.

Question 5

The IUPAC name for $$\mathrm{NF_3$}$$ should include which of the following?

Accepted Answer

the prefix “tri” before fluoride

Question 6

Based on its position in the periodic table, what can most likely be predicted about sulfur (S)?

Accepted Answer

It has six valence electrons available for bonding.

Question 7

John Dalton’s work on atomic structure helped to explain which scientist’s law about the ratios of masses of elements in a compound?

Accepted Answer

Joseph Proust

Question 8

A substance conducts electricity in the liquid state but not in the solid state. What does this suggest about the type of bonding in the substance?

Accepted Answer

The bonds are ionic.

Question 9

A student is comparing theories, hypotheses, and laws. In which row should the student enter “Yes” in the columns for Theory and Hypothesis only?

Accepted Answer

Is falsifiable

Question 10

A series of chemical reactions in the human body produces energy used at both the cellular and organismal levels. In which course would these reactions most likely be studied?

Accepted Answer

biochemistry

Question 11

Which statement is a component of John Dalton’s atomic theory?

Accepted Answer

An atom is a small particle that cannot be broken down.

Question 12

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to use?

Accepted Answer

an orbital notation of the atom

Question 13

Henry wants to monitor the change in concentration of an acid during a chemical reaction, collecting data every $$0.1$$ seconds and graphing it. Which pair of tools would be best for this task?

Accepted Answer

a computer and a concentration probe

Question 14

To explain the photoelectric effect, Albert Einstein built on the idea of energy quanta from which scientist?

Accepted Answer

Max Planck

Question 15

Yusef adds all the values in his data set and divides by the number of values. What is he calculating?

Accepted Answer

the mean

Question 16

When magnesium metal burns in air, it produces a bright light and a white powder. Why is this considered a chemical change?

Accepted Answer

because a new substance is formed

Question 17

If two substances have molecules of similar size, but one is polar and the other is nonpolar, what is most likely true about their boiling points?

Accepted Answer

The nonpolar substance has a lower boiling point than the polar substance.

Question 18

Rachel is performing an acid-base titration and wants to measure the volume of base needed to neutralize an acid to two decimal places. Which tool should she use?

Accepted Answer

buret

Question 19

A chromium atom has a mass number of $$52$$ and $$24$$ protons. How many neutrons does it have?

Accepted Answer

$$28$$

Question 20

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative atom?

Accepted Answer

ionic bonding

General Chemistry Cumulative Exam Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard