Benchmark 1 Practice Test

Front

What is the absorption spectrum of oxygen?

Back

The absorption spectrum of oxygen is a spectrum that shows the wavelengths of light absorbed by oxygen molecules, indicating the energy transitions of electrons within the oxygen atoms.

Front

What does a line in an absorption spectrum represent?

Back

A line in an absorption spectrum represents a specific electron energy transition, with the position of the line indicating the energy difference between two electron states.

Front

What is the significance of electron energy transitions in atoms?

Back

Electron energy transitions are significant because they determine the wavelengths of light absorbed or emitted by an atom, which can be used to identify elements and their concentrations.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in the nucleus of an atom, which determines the element's identity and its position in the periodic table.

Front

How do you determine the number of neutrons in an isotope?

Back

To determine the number of neutrons in an isotope, subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons).

Front

What is a stock solution in chemistry?

Back

A stock solution is a concentrated solution that can be diluted to a lower concentration for use in experiments or reactions.

Front

What precautions should be taken to avoid contamination of stock solutions?

Back

To avoid contamination, do not place dropping pipettes in stock solution bottles, replace tops on reagent bottles after use, and never return excess chemicals to stock bottles.

Front

What is the role of protons in determining an element's properties?

Back

Protons determine an element's identity and its chemical properties, as they define the element's atomic number and influence its behavior in chemical reactions.

Front

What is the relationship between protons, neutrons, and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons, resulting in no overall charge.

Front

What is the significance of the number 0 in a chemical context?

Back

The number 0 can represent a neutral charge in ions, indicating that there is no net charge due to equal numbers of protons and electrons.