CHS Semester 1 Science Challenge

Front

What type of bond is formed when two atoms share one or more pairs of electrons?

Back

Covalent bond

Front

What is the primary difference between isotopes of the same element?

Back

They have different numbers of neutrons.

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.

Front

As temperature increases, molecules _____________

Back

move faster.

Front

Describe the process of sublimation.

Back

Sublimation is the process where a substance transitions directly from a solid to a gas without passing through the liquid phase.

Front

What is an ionic bond?

Back

An ionic bond is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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 the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

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.