Sem 1 Final Exam Physical Science

Front

What is an electron?

Back

A particle that moves around the nucleus of an atom and has a negative charge.

Front

What does it mean that scientists update the atomic model?

Back

It means that new information about atoms continues to be discovered, leading to changes in our understanding of atomic structure.

Front

In which state of matter do molecules have the largest space between them?

Back

Gas.

Front

What is the Law of Conservation of Matter/Mass?

Back

It states that energy is never created nor destroyed; it only changes form.

Front

What is a product in a chemical reaction?

Back

The substances that are formed by a chemical reaction.

Front

What is a proton?

Back

A positively charged particle found in the nucleus of an atom.

Front

What is a neutron?

Back

A particle found in the nucleus of an atom that has no charge.

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 chemically bonded together.

Front

What is the atomic number?

Back

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

Front

What is a chemical reaction?

Back

A process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.