Physical Science Semester 1 Exam

Front

What is the basis for Mendeleev's arrangement of the periodic table?

Back

Mendeleev arranged the known chemical elements in a table according to increasing mass.

Front

What trend do ionization energies exhibit across a period?

Back

Ionization energies tend to increase from left to right across a period.

Front

What is the standard on which the atomic mass unit is based?

Back

The atomic mass unit is based on the mass of a carbon-12 atom.

Front

What should a scientist do if the data in an investigation do not support the original hypothesis?

Back

The hypothesis will be revised.

Front

How is the atomic mass of an element defined?

Back

The atomic mass of an element is a weighted average of the masses of the element’s isotopes.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have different numbers of neutrons.

Front

What is the significance of the periodic table in chemistry?

Back

The periodic table organizes elements based on their properties and atomic structure.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.