Chemistry regents Midterm review

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is an isotope?

Back

An isotope is an atom of the same element that has a different number of neutrons.

Front

What is the charge and mass of an electron?

Back

An electron has a negative charge and a mass of approximately 0 amu.

Front

Who discovered the electron and how?

Back

J.J. Thomson discovered the electron using a cathode ray tube.

Front

What is a chemical compound?

Back

A chemical compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.