1st Six Weeks Review Checkpoint

Front

What is a compound?

Back

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

Front

What is the difference between a chemical change and a physical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

Which of the following represents an element: H2O, H2, NaCl, CaCO3?

Back

H2 represents an element.

Front

What does the periodic table show?

Back

The periodic table is a chart that displays all known chemical elements organized by their atomic number, electron configuration, and recurring chemical properties.

Front

How many molecules of caffeine are there in a given sample if the answer is 5?

Back

There are 5 molecules of caffeine in the sample.

Front

What is an element?

Back

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

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a process that involves the transformation of one substance into another through a chemical reaction.

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number represents the number of protons in the nucleus of an atom and determines the element's identity.

Front

What are molecules?

Back

Molecules are groups of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.